All Wiring Diagrams for GMC Cab & Chassis C1998 2500 – Diagramas de fiação para carros

AIR CONDITIONING

5.0L

5.0L (VIN M), A/C Wiring Diagram for GMC Cab & Chassis C1998 2500

List of elements for 5.0L (VIN M), A/C Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, near diode)
(engine harness, 22 cm from ebcm breakout)
(engine harness, near ebcm breakout)
(engine harness, near egr valve breakout)
(exc 4.3 l)
(fwd lamps harn, 5 cm from right headlamp breakout)
(hvac harness, 4 cm from recirc door breakout)
(hvac harness, 8 cm from recirc door breakout)
(i/p harn, 28 cm from cluster breakout)
(i/p harness, behind center of dash)
(right side of dash)
A/c comp fuse 10a
A/c compressor clutch
A/c compressor clutch relay (in underhood fuse/relay center)
A/c compressor cycling switch (in low pressure line, on accumulator)
A/c ctrl
A/c disable
A/c high pressure cutout switch (on a/c compressor)
A/c low pressure cutout switch (on a/c compressor)
A/c req
A/c switch
Air temp dr sensor
Aux fan ctrl
Aux fan fuse 30a
Auxiliary cooling fan motor
Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center)
Battery
Blower fuse 3 50a
Blower motor (under right side of dash)
Blower resistor (on blower motor housing)
Blower switch
Center
Defogger element
Diode
Front mode door motor (on front a/c-heater housing)
Front temperature door motor (on front a/c-heater housing)
Fuse block
G101 (right front of engine compartment)
G119 (top right side of cylinder head)
G120 (right side of engine)
G201
G202 (behind left side of dash)
Ground
High blower relay (on top of front a/c-heater housing)
Hot at all times
Hot in run
Hot in run or start
Htr a/c fuse 12 25a
Hvac control module
Ign e fuse 10a
Ignition
Illumination
Interior lights system
Mode signal
Off
Pnk
Rear defogger system
Recirculation door motor (on front a/c-heater housing)
Red
Relay ctrl
S103
S110
S128
S146
S147 (engine harn, near egr breakout)
S185
S186
S212 (i/p harn, behind center of dash)
S243
S244
S268
S298
Sw sig
Tan
Underhood fuse-relay
Underhood fuse-relay center
Valve ctrl
Vehicle control module (left side of engine compt)
Water valve (suburban, utility, crew cab only) (right center of intake area)

5.0L (VIN M), Compressor Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 5.0L (VIN M), Compressor Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, near diode)
22 cm from ebcm breakout)
A/c comp fuse 10a
A/c compressor clutch
A/c compressor clutch relay (in underhood fuse-relay center)
A/c compressor cycling switch (in low pressure line, on accumulator)
A/c control
A/c disable
A/c high pressure cutout switch (on a/c compressor)
A/c low pressure cutout switch (on a/c compressor)
A/c req
A/c switch
Blower switch
Diode
Fuse block
G119 (top right side of cylinder head)
G120 (right side of engine)
Hot in run
Hot in run or start
Htr a/c fuse 12 25a
Hvac control module
Ign e fuse 10a
Ignition
Near egr valve breakout)
Off
Pnk
S146 (eng harn, pnk
S185
S186
S268 (i/p harn, behind center of dash)
Sw sig
Underhood fuse-relay center
Vehicle control module (left side of engine compt)

Heater Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for Heater Wiring Diagram for GMC Cab & Chassis C1998 2500:

(hvac harn, 8 cm from recirc door breakout) s244
(i/p harn, 24 cm from i/p cluster breakout)
(right side of dash) g201
Air temp dr sensor
Battery
Blower fuse 3 50a
Blower motor (under right side of dash)
Blower resistor (on blower motor housing)
Blower switch
Defogger element
Front mode door motor (on front a/c-heater housing)
Front temperature door motor (on front a/c-heater housing)
Fuse block
G202 (behind left side of dash)
Ground
High blower relay (on top of front a/c- heater blower housing)
Hot at all times
Hot in run
Htr-a/c fuse 12 25a
Hvac control module
Ignition
Illumination
Interior lights system
Mode signal
Off
Rear defogger system
Recirc ctrl
Recirculation door motor (on front a/c-heater housing)
Red
S110 (engine harness, near ebcm breakout)
S243 (hvac harn, 4 cm from recirc door breakout)
S268 (i/p harness, behind center of dash)
S298
Tan
Underhood fuse-relay center

5.7L

5.7L (VIN R), A/C Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 5.7L (VIN R), A/C Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, near diode)
(engine harness, 22 cm from ebcm breakout)
(engine harness, near ebcm breakout)
(engine harness, near egr valve breakout)
(exc 4.3 l)
(fwd lamps harn, 5 cm from right headlamp breakout)
(hvac harness, 4 cm from recirc door breakout)
(hvac harness, 8 cm from recirc door breakout)
(i/p harn, 28 cm from cluster breakout)
(i/p harness, behind center of dash)
(right side of dash)
A/c comp fuse 10a
A/c compressor clutch
A/c compressor clutch relay (in underhood fuse/relay center)
A/c compressor cycling switch (in low pressure line, on accumulator)
A/c ctrl
A/c disable
A/c high pressure cutout switch (on a/c compressor)
A/c low pressure cutout switch (on a/c compressor)
A/c req
A/c switch
Air temp dr sensor
Aux fan ctrl
Aux fan fuse 30a
Auxiliary cooling fan motor
Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center)
Battery
Blower fuse 3 50a
Blower motor (under right side of dash)
Blower resistor (on blower motor housing)
Blower switch
Center
Defogger element
Diode
Front mode door motor (on front a/c-heater housing)
Front temperature door motor (on front a/c-heater housing)
Fuse block
G101 (right front of engine compartment)
G119 (top right side of cylinder head)
G120 (right side of engine)
G201
G202 (behind left side of dash)
Ground
High blower relay (on top of front a/c-heater housing)
Hot at all times
Hot in run
Hot in run or start
Htr a/c fuse 12 25a
Hvac control module
Ign e fuse 10a
Ignition
Illumination
Interior lights system
Mode signal
Off
Pnk
Rear defogger system
Recirculation door motor (on front a/c-heater housing)
Red
Relay ctrl
S103
S110
S128
S146
S147 (engine harn, near egr breakout)
S185
S186
S212 (i/p harn, behind center of dash)
S243
S244
S268
S298
Sw sig
Tan
Underhood fuse-relay
Underhood fuse-relay center
Valve ctrl
Vehicle control module (left side of engine compt)
Water valve (suburban, utility, crew cab only) (right center of intake area)

5.7L (VIN R), Compressor Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 5.7L (VIN R), Compressor Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, near diode)
22 cm from ebcm breakout)
A/c comp fuse 10a
A/c compressor clutch
A/c compressor clutch relay (in underhood fuse-relay center)
A/c compressor cycling switch (in low pressure line, on accumulator)
A/c control
A/c disable
A/c high pressure cutout switch (on a/c compressor)
A/c low pressure cutout switch (on a/c compressor)
A/c req
A/c switch
Blower switch
Diode
Fuse block
G119 (top right side of cylinder head)
G120 (right side of engine)
Hot in run
Hot in run or start
Htr a/c fuse 12 25a
Hvac control module
Ign e fuse 10a
Ignition
Near egr valve breakout)
Off
Pnk
S146 (eng harn, pnk
S185
S186
S268 (i/p harn, behind center of dash)
Sw sig
Underhood fuse-relay center
Vehicle control module (left side of engine compt)

Heater Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for Heater Wiring Diagram for GMC Cab & Chassis C1998 2500:

(hvac harn, 8 cm from recirc door breakout) s244
(i/p harn, 24 cm from i/p cluster breakout)
(right side of dash) g201
Air temp dr sensor
Battery
Blower fuse 3 50a
Blower motor (under right side of dash)
Blower resistor (on blower motor housing)
Blower switch
Defogger element
Front mode door motor (on front a/c-heater housing)
Front temperature door motor (on front a/c-heater housing)
Fuse block
G202 (behind left side of dash)
Ground
High blower relay (on top of front a/c- heater blower housing)
Hot at all times
Hot in run
Htr-a/c fuse 12 25a
Hvac control module
Ignition
Illumination
Interior lights system
Mode signal
Off
Rear defogger system
Recirc ctrl
Recirculation door motor (on front a/c-heater housing)
Red
S110 (engine harness, near ebcm breakout)
S243 (hvac harn, 4 cm from recirc door breakout)
S268 (i/p harness, behind center of dash)
S298
Tan
Underhood fuse-relay center

6.5L

6.5L (VIN F), A/C Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN F), A/C Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, 30 cm from breakout to ebcm)
(engine harn, near diode)
(engine harness, near ebcm breakout)
(hvac harness, 4 cm from recirc door breakout)
(hvac harness, 8 cm from recirc door breakout)
(i/p harn, 24 cm from cluster breakout)
(i/p harness, behind center of dash)
(right side of dash) g201
A/c comp fuse 10a
A/c compressor clutch
A/c compressor clutch relay (in underhood fuse/relay center)
A/c compressor cycling switch (in low pressure line, on accumulator)
A/c ctrl
A/c disable
A/c enable
A/c high pressure cutout switch (on a/c compressor)
A/c low pressure cutout switch (on a/c compressor)
A/c switch
Air temp dr sensor
Aux fan ctrl
Battery
Blower fuse 3 50a
Blower motor
Blower resistor (under right side of dash, on heater housing)
Blower switch
Center
Defogger element
Diode
Front mode door motor (under dash on heater- a/c case)
Front temperature door motor (under dash on heater- a/c case)
Fuse block
G120 (right side of engine)
G202 (behind left side of dash)
Ground
Heater and a/c control module
High blower relay (under dash on top of heater-a/c case)
Hot at all times
Hot in run
Hot in run or start
Htr-a/c fuse 12 25a
Ign 1 fuse 10a
Ignition
Illumination
Interior lights system
Mode signal
Off
Pnk
Powertrain control module (left rear of engine compt)
Rear defogger system
Recirculation door motor (under dash on heater- a/c case)
Red
S107
S110
S147 (engine harn, 4 cm from starter motor breakout)
S185
S186
S212 (i/p harn, behind center of dash)
S243
S244
S268
S298
Tan
Underhood fuse-relay

6.5L (VIN F), Compressor Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN F), Compressor Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, near diode)
30 cm from ebcm breakout)
A/c comp fuse 10a
A/c compressor clutch
A/c compressor clutch relay (in underhood fuse-relay center)
A/c compressor cycling switch (in low pressure line, on accumulator)
A/c control
A/c disable
A/c enable
A/c high pressure cutout switch (on a/c compressor)
A/c low pressure cutout switch (on a/c compressor)
A/c switch
Aux fan ctrl
Blower switch
Diode
Fuse block
G120 (right side of engine)
Hot in run
Hot in run or start
Htr a/c fuse 12 25a
Hvac control module
Ign 1 fuse 10a
Ignition
Off
Pnk
Powertrain control module (left rear of engine compt)
Recirculation door motor (under dash, on heater- a/c case)
S185
S186
S268 (i/p harn, behind center of dash)
Underhood fuse-relay center

6.5L (VIN S), A/C Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN S), A/C Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, 30 cm from breakout to ebcm)
(engine harn, near diode)
(engine harness, near ebcm breakout)
(hvac harness, 4 cm from recirc door breakout)
(hvac harness, 8 cm from recirc door breakout)
(i/p harn, 24 cm from cluster breakout)
(i/p harness, behind center of dash)
(right side of dash) g201
A/c comp fuse 10a
A/c compressor clutch
A/c compressor clutch relay (in underhood fuse/relay center)
A/c compressor cycling switch (in low pressure line, on accumulator)
A/c ctrl
A/c disable
A/c enable
A/c high pressure cutout switch (on a/c compressor)
A/c low pressure cutout switch (on a/c compressor)
A/c switch
Air temp dr sensor
Aux fan ctrl
Battery
Blower fuse 3 50a
Blower motor
Blower resistor (under right side of dash, on heater housing)
Blower switch
Center
Defogger element
Diode
Front mode door motor (under dash on heater- a/c case)
Front temperature door motor (under dash on heater- a/c case)
Fuse block
G120 (right side of engine)
G202 (behind left side of dash)
Ground
Heater and a/c control module
High blower relay (under dash on top of heater-a/c case)
Hot at all times
Hot in run
Hot in run or start
Htr-a/c fuse 12 25a
Ign 1 fuse 10a
Ignition
Illumination
Interior lights system
Mode signal
Off
Pnk
Powertrain control module (left rear of engine compt)
Rear defogger system
Recirculation door motor (under dash on heater- a/c case)
Red
S107
S110
S147 (engine harn, 4 cm from starter motor breakout)
S185
S186
S212 (i/p harn, behind center of dash)
S243
S244
S268
S298
Tan
Underhood fuse-relay

6.5L (VIN S), Compressor Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN S), Compressor Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, near diode)
30 cm from ebcm breakout)
A/c comp fuse 10a
A/c compressor clutch
A/c compressor clutch relay (in underhood fuse-relay center)
A/c compressor cycling switch (in low pressure line, on accumulator)
A/c control
A/c disable
A/c enable
A/c high pressure cutout switch (on a/c compressor)
A/c low pressure cutout switch (on a/c compressor)
A/c switch
Aux fan ctrl
Blower switch
Diode
Fuse block
G120 (right side of engine)
Hot in run
Hot in run or start
Htr a/c fuse 12 25a
Hvac control module
Ign 1 fuse 10a
Ignition
Off
Pnk
Powertrain control module (left rear of engine compt)
Recirculation door motor (under dash, on heater- a/c case)
S185
S186
S268 (i/p harn, behind center of dash)
Underhood fuse-relay center

Heater Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for Heater Wiring Diagram for GMC Cab & Chassis C1998 2500:

(hvac harn, 8 cm from recirc door breakout) s244
(i/p harn, 24 cm from i/p cluster breakout)
(right side of dash) g201
Air temp dr sensor
Battery
Blower fuse 3 50a
Blower motor (under right side of dash)
Blower resistor (on blower motor housing)
Blower switch
Defogger element
Front mode door motor (on front a/c-heater housing)
Front temperature door motor (on front a/c-heater housing)
Fuse block
G202 (behind left side of dash)
Ground
High blower relay (on top of front a/c- heater blower housing)
Hot at all times
Hot in run
Htr-a/c fuse 12 25a
Hvac control module
Ignition
Illumination
Interior lights system
Mode signal
Off
Rear defogger system
Recirc ctrl
Recirculation door motor (on front a/c-heater housing)
Red
S110 (engine harness, near ebcm breakout)
S243 (hvac harn, 4 cm from recirc door breakout)
S268 (i/p harness, behind center of dash)
S298
Tan
Underhood fuse-relay center

ANTI-LOCK BRAKES

5.0L

5.0L (VIN M), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 5.0L (VIN M), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500:

(engine harn, 6.5 cm from underhood fuse relay center)
(engine harn, near ebcm break- out)
(engine harn, near tail- lamp breakout)
(left side of dash) data link connector
(right lower front of engine)
4wd sw input
4wd telltale feed
Abs fuse 60a
Abs ind
Abs lamp control
Brake fuse 18 10a
Brake ind
Brake sw input
Brake sw output
Daytime running lamps module (left side of dash)
Ebcm ground
Electronic brake control module (left side of engine compt)
G119
Gauges fuse 4 10a
Hot at all times
Hot in run
Hot in run, bulb test or start
I/p fuse block
Ign
Ind out
Instrument cluster
Left front wheel speed sensor
Lft frt sensor (+)
Lft frt sensor (-)
Pnk
Pump motor ground
Pump motor power
Red
Right front wheel speed sensor
Rt frt sensor (+)
Rt frt sensor (-)
S107
S111
S150
S151
S152
S213
Serial data line
Tan
Tcc/ stoplamp switch (top of brake pedal)
Underhood fuse-relay center
Vehicle control module (left side of engine compt)
Vehicle speed sensor (left side of transmission/ transfer case)
Vehicle speed sig
Vss (+)
Vss (-)
Vss sig

5.7L

5.7L (VIN R), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 5.7L (VIN R), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500:

(engine harn, 6.5 cm from underhood fuse relay center)
(engine harn, near ebcm break- out)
(engine harn, near tail- lamp breakout)
(left side of dash) data link connector
(right lower front of engine)
4wd sw input
4wd telltale feed
Abs fuse 60a
Abs ind
Abs lamp control
Brake fuse 18 10a
Brake ind
Brake sw input
Brake sw output
Daytime running lamps module (left side of dash)
Ebcm ground
Electronic brake control module (left side of engine compt)
G119
Gauges fuse 4 10a
Hot at all times
Hot in run
Hot in run, bulb test or start
I/p fuse block
Ign
Ind out
Instrument cluster
Left front wheel speed sensor
Lft frt sensor (+)
Lft frt sensor (-)
Pnk
Pump motor ground
Pump motor power
Red
Right front wheel speed sensor
Rt frt sensor (+)
Rt frt sensor (-)
S107
S111
S150
S151
S152
S213
Serial data line
Tan
Tcc/ stoplamp switch (top of brake pedal)
Underhood fuse-relay center
Vehicle control module (left side of engine compt)
Vehicle speed sensor (left side of transmission/ transfer case)
Vehicle speed sig
Vss (+)
Vss (-)
Vss sig

6.5L

6.5L (VIN F), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN F), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500:

(engine harn, 4 cm from i/p breakout)
(engine harness, 13 cm in ebcm breakout)
(left side of dash) data link connector
(right front of engine block)
4wd input
4wd sw input
A/t only
Abs fuse 60a
Abs ind
Abs lamp control
Brake fuse 18 10a
Brake ind
Brake lamp control
Brake pressure warning switch
Brake sw input
Daytime running lamps module (behind left side of dash)
Diode 1 (underhood fuse/relay center)
Ebcm ground
Electronic brake control module (left side of engine compt)
Front axle actuator (right front of drive axle)
G120
Gauges fuse 4 10a
Hot at all times
Hot in run
Hot in run or start
I/p fuse block
Ign
Instrument cluster
Left front wheel speed sensor
Lft frt sensor (+)
Lft frt sensor (-)
Pnk
Pump motor ground
Pump motor power
Red
Right front wheel speed sensor
Rt frt sensor (+)
Rt frt sensor (-)
S107
S111 (engine harn, near ebcm breakout)
S150
S152
S157
S213
Serial data line
Serial data signal
Tan
Underhood fuse-relay center
Vehicle speed sensor buffer (behind right side of dash)
Vss sig
Vss sig out

6.5L (VIN S), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN S), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500:

(engine harn, 4 cm from i/p breakout)
(engine harness, 13 cm in ebcm breakout)
(left side of dash) data link connector
(right front of engine block)
4wd input
4wd sw input
A/t only
Abs fuse 60a
Abs ind
Abs lamp control
Brake fuse 18 10a
Brake ind
Brake lamp control
Brake pressure warning switch
Brake sw input
Daytime running lamps module (behind left side of dash)
Diode 1 (underhood fuse/relay center)
Ebcm ground
Electronic brake control module (left side of engine compt)
Front axle actuator (right front of drive axle)
G120
Gauges fuse 4 10a
Hot at all times
Hot in run
Hot in run or start
I/p fuse block
Ign
Instrument cluster
Left front wheel speed sensor
Lft frt sensor (+)
Lft frt sensor (-)
Pnk
Pump motor ground
Pump motor power
Red
Right front wheel speed sensor
Rt frt sensor (+)
Rt frt sensor (-)
S107
S111 (engine harn, near ebcm breakout)
S150
S152
S157
S213
Serial data line
Serial data signal
Tan
Underhood fuse-relay center
Vehicle speed sensor buffer (behind right side of dash)
Vss sig
Vss sig out

7.4L

7.4L (VIN J), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 7.4L (VIN J), Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C1998 2500:

(engine harn, 6.5 cm from underhood fuse relay center)
(engine harn, near ebcm break- out)
(engine harn, near tail- lamp breakout)
(left side of dash) data link connector
(right lower front of engine)
4wd sw input
4wd telltale feed
Abs fuse 60a
Abs ind
Abs lamp control
Brake fuse 18 10a
Brake ind
Brake sw input
Brake sw output
Daytime running lamps module (left side of dash)
Ebcm ground
Electronic brake control module (left side of engine compt)
G119
Gauges fuse 4 10a
Hot at all times
Hot in run
Hot in run, bulb test or start
I/p fuse block
Ign
Ind out
Instrument cluster
Left front wheel speed sensor
Lft frt sensor (+)
Lft frt sensor (-)
Pnk
Pump motor ground
Pump motor power
Red
Right front wheel speed sensor
Rt frt sensor (+)
Rt frt sensor (-)
S107
S111
S150
S151
S152
S213
Serial data line
Tan
Tcc/ stoplamp switch (top of brake pedal)
Underhood fuse-relay center
Vehicle control module (left side of engine compt)
Vehicle speed sensor (left side of transmission/ transfer case)
Vehicle speed sig
Vss (+)
Vss (-)
Vss sig

ANTI-THEFT

Anti-theft Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for Anti-theft Wiring Diagram for GMC Cab & Chassis C1998 2500:

(i/p harn, 5 cm from dlc breakout)
(top front of engine)
12v
12v reg
5 volt ref
Data link connector (dlc) (left side of dash)
Electronic power steering system
Engine controls system
Evo sol feed
Evo sol out
Evo/passlock module (near dash auxiliary storage compartment)
G134
Gauges fuse 4 10a
Grd
Hot at all times
Hot in run or start
I/p fuse block
Ign
Instrument cluster
Nca
Passlock sensor (in steering column, near lock cylinder)
Passlock sig
Passlock signal
Pnk
Resistor (10 ohms)
S213
S215
S280
Sec ind out
Sec/strg fuse 21 10a
Security indicator
Sens ret
Sensor grd
Serial data
Steering handwheel speed sensor (sensor ground)
Vss
Wheel pos sig

COMPUTER DATA LINES

Computer Data Lines for GMC Cab & Chassis C1998 2500

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List of elements for Computer Data Lines for GMC Cab & Chassis C1998 2500:

13 cm from ebcm breakout)
Automatic transfer case control module (behind left side of dash)
Aux pwr fuse 7 25a
Data clss
Data clss 2
Data link connector (under left side of dash, left of steering column)
Diesel
Dlc control
Electronic brake control module (on left side of engine compt)
Electronic variable orifice/passlock control module (under center of dash)
G131 (near thermostat housing)
G202 (behind left side of dash)
Gasoline
Hot at all times
I/p fuse block
Inflatable restraint sensing and diagnostic module (under driver's seat carpet)
Powertrain control module (behind right side of dash, near blower motor)
Prog enable
Radio
Remote control door lock receiver (behind center of dash)
S204
S215
S272
S280 (dash harness, approx 5 cm from dlc breakout)
Serial data
Tan
Transfer case control module (under dash, on steering column support bracket)
Uart data
Vehicle control module (on left side of engine compt)

COOLING FAN

5.0L

5.0L (VIN M), Cooling Fan Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 5.0L (VIN M), Cooling Fan Wiring Diagram for GMC Cab & Chassis C1998 2500:

(fwd lamps harn, 5 cm from right headlamp breakout)
(in underhood fuse/relay center)
(right front of engine compartment)
A/c comp fuse 10a
Aux fan ctrl
Aux fan fuse 30a
Auxiliary cooling fan motor
Auxiliary cooling fan relay
Fan req
G101
Heater and a/c control module
Hot at all times
Hot in run or start
Recirculation door motor (on a/c- heater housing)
Red
Relay ctrl
S128
S212 (i/p harn, 8 cm from radio breakout)
Underhood fuse-relay center
Vehicle control module (left rear of engine compt)

5.7L

5.7L (VIN R), Cooling Fan Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 5.7L (VIN R), Cooling Fan Wiring Diagram for GMC Cab & Chassis C1998 2500:

(fwd lamps harn, 5 cm from right headlamp breakout)
(in underhood fuse/relay center)
(right front of engine compartment)
A/c comp fuse 10a
Aux fan ctrl
Aux fan fuse 30a
Auxiliary cooling fan motor
Auxiliary cooling fan relay
Fan req
G101
Heater and a/c control module
Hot at all times
Hot in run or start
Recirculation door motor (on a/c- heater housing)
Red
Relay ctrl
S128
S212 (i/p harn, 8 cm from radio breakout)
Underhood fuse-relay center
Vehicle control module (left rear of engine compt)

7.4L

7.4L (VIN J), Cooling Fan Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 7.4L (VIN J), Cooling Fan Wiring Diagram for GMC Cab & Chassis C1998 2500:

(fwd lamps harn, 5 cm from right headlamp breakout)
(in underhood fuse/relay center)
(right front of engine compartment)
A/c comp fuse 10a
Aux fan ctrl
Aux fan fuse 30a
Auxiliary cooling fan motor
Auxiliary cooling fan relay
Fan req
G101
Heater and a/c control module
Hot at all times
Hot in run or start
Recirculation door motor (on a/c- heater housing)
Red
Relay ctrl
S128
S212 (i/p harn, 8 cm from radio breakout)
Underhood fuse-relay center
Vehicle control module (left rear of engine compt)

CRUISE CONTROL

5.0L

5.0L (VIN M), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 5.0L (VIN M), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500:

(i/p harn, 20 cm from cluster breakout)
(i/p harn, 20 cm from heater/ a/c breakout)
(i/p harn, left rear of engine compt)
(i/p harness, 6 cm from steering column harness breakout)
4000 pulses/mile
A/t
A12
A13
A14
A15
Brake fuse 18 10a
Clutch pedal switch (top of clutch pedal)
Cruise control module (left rear of engine compartment)
Cruise control switch
Cruise fuse 6 10a
Cruise on input
Cruise status
Disengage input
G120 (right side of engine)
Ground
Hot at all times
Hot in run
I/p fuse block
Ignition
M/t
Off
R/a
Resume/accel input
S/c
S153
S215
S220
S221
S222
S299
Set/coast input
Stop/haz fuse 1 20a
Stoplamp switch (top of brake pedal)
Vehicle control module (vcm) (left side of engine compt)
Vehicle speed input
Vehicle speed sensor (vss) (left side of transmission)
Vss return
Vss signal

5.7L

5.7L (VIN R), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 5.7L (VIN R), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500:

(i/p harn, 20 cm from cluster breakout)
(i/p harn, 20 cm from heater/ a/c breakout)
(i/p harn, left rear of engine compt)
(i/p harness, 6 cm from steering column harness breakout)
4000 pulses/mile
A/t
A12
A13
A14
A15
Brake fuse 18 10a
Clutch pedal switch (top of clutch pedal)
Cruise control module (left rear of engine compartment)
Cruise control switch
Cruise fuse 6 10a
Cruise on input
Cruise status
Disengage input
G120 (right side of engine)
Ground
Hot at all times
Hot in run
I/p fuse block
Ignition
M/t
Off
R/a
Resume/accel input
S/c
S153
S215
S220
S221
S222
S299
Set/coast input
Stop/haz fuse 1 20a
Stoplamp switch (top of brake pedal)
Vehicle control module (vcm) (left side of engine compt)
Vehicle speed input
Vehicle speed sensor (vss) (left side of transmission)
Vss return
Vss signal

6.5L

6.5L (VIN F), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN F), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, 4 cm from i/p harness breakout)
(i/p harn, 12 cm from steering column breakout)
(i/p harn, 6 cm from steering column breakout)
A/t
A11
A12
A13
A14
A15
B10
B11
Brake fuse 18 10a
Clutch pedal switch (top of clutch pedal)
Cruise fuse 6 10a
Cruise on input
D10
Disengage input
Fuse block
Hot at all times
Hot in run
M/t
Multifunction lever
Off
Powertrain control module (pcm) (right side of dash)
R/a
Resume/accel input
S/c
S220
S299
Set/coast input
Stop/haz fuse 1 20a
Tcc/stoplamp switch (top of brake pedal)
Vehicle speed sensor (vss) buffer (behind right side of dash)
Vss return

6.5L (VIN S), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN S), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500:

(engine harn, 4 cm from i/p harness breakout)
(i/p harn, 12 cm from steering column breakout)
(i/p harn, 6 cm from steering column breakout)
A/t
A11
A12
A13
A14
A15
B10
B11
Brake fuse 18 10a
Clutch pedal switch (top of clutch pedal)
Cruise fuse 6 10a
Cruise on input
D10
Disengage input
Fuse block
Hot at all times
Hot in run
M/t
Multifunction lever
Off
Powertrain control module (pcm) (right side of dash)
R/a
Resume/accel input
S/c
S220
S299
Set/coast input
Stop/haz fuse 1 20a
Tcc/stoplamp switch (top of brake pedal)
Vehicle speed sensor (vss) buffer (behind right side of dash)
Vss return

7.4L

7.4L (VIN J), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 7.4L (VIN J), Cruise Control Wiring Diagram for GMC Cab & Chassis C1998 2500:

(i/p harn, 20 cm from cluster breakout)
(i/p harn, 20 cm from heater/ a/c breakout)
(i/p harn, left rear of engine compt)
(i/p harness, 6 cm from steering column harness breakout)
4000 pulses/mile
A/t
A12
A13
A14
A15
Brake fuse 18 10a
Clutch pedal switch (top of clutch pedal)
Cruise control module (left rear of engine compartment)
Cruise control switch
Cruise fuse 6 10a
Cruise on input
Cruise status
Disengage input
G120 (right side of engine)
Ground
Hot at all times
Hot in run
I/p fuse block
Ignition
M/t
Off
R/a
Resume/accel input
S/c
S153
S215
S220
S221
S222
S299
Set/coast input
Stop/haz fuse 1 20a
Stoplamp switch (top of brake pedal)
Vehicle control module (vcm) (left side of engine compt)
Vehicle speed input
Vehicle speed sensor (vss) (left side of transmission)
Vss return
Vss signal

DEFOGGERS

Defogger Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Defogger Wiring Diagram for GMC Cab & Chassis C1998 2500:

(utility only)
(w/ heated mirrors)
C222
Convenience center (under left side of dash)
G201 (right side of dash)
G202 (behind left side of dash)
G305 (right "b" pillar)
G415 (frame ground, rear of vehicle)
Heated mirror relay (on convenience center)
Heater and a/c control switch
Hot in run
Hot in run or start
Htr-a/c fuse 12 25a
I/p fuse block
Left cargo door contactor
Left heated mirror
Left outside rear view mirror
Left rear cargo door defogger grid
Mirrors fuse 10a
Nca
Nca a
Pick-up w/ extended or crew cab
Rear defogger switch
Rear window defogger grid
Right cargo door contactor
Right heated mirror
Right rear cargo door defogger grid
Rr-defog fuse 30a
S218
S251
S259
S268
S410
S425 (body harn., approx 11 cm from lr speaker breakout)
S506 (inside power outside rear view mirror harn., 7 cm from power outside rear view mirror)
Solid state time delay relay
Suburban/utility w/ liftgate
Suburban/utility w/o liftgate
Underhood fuse/relay center

ELECTRONIC POWER STEERING

Electronic Power Steering Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Electronic Power Steering Wiring Diagram for GMC Cab & Chassis C1998 2500:

(diesel: i/p harness, approximately 8 cm from instrument cluster breakout, toward radio connectors breakout) (gasoline: i/p harness, approximately 12 cm from instrument cluster breakout toward radio connectors breakout)
(front top of engine) g134
(i/p harness, approximately 40 cm from instrument cluster breakout)
(i/p harness, approximately 5 cm from dlc breakout)
(right top of cylinder head) g120
5 volt ref
Battery
Dash fuse block (under left side of dash)
Data
Data link connector (dlc) (under left side of dash, left of steering column)
Diesel
Electronic variable orifice (evo)/passlock control module (under center of dash)
Evo feed
Evo solenoid out
Gas
Gauges fuse 4 10a
Ground
Hot at all times
Hot in run or start
Ignition
Pnk
S213
S215
S221
S280
Security/strg fuse 21 20a
Sensor return
Steering assist control solenoid (part of power steering pump)
Steering handwheel speed sensor (on steering column, near firewall)
Steering wheel posit signal
Sws posit sig
Vehicle control module (on left side of engine compartment)
Vehicle speed sensor buffer (behind right side of dash)
Volt ref
Vss sig out
Vss signal input

ENGINE PERFORMANCE

5.0L

5.0L (VIN M), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 5.0L (VIN M), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500:

(attached to right rear of throttle body) idle air control (iac) valve
(bottom front of engine near, crank pulley) crankshaft position sensor
(top right side of engine) evaporative emission canister purge valve
1-2 shift sol ctrl
2-3 shift sol ctrl
3-2 shift sol ctrl
Air pump rel ctrl
Cam posit sens sig
Camshaft position sensor (inside distributor)
Crank posit sens sig
Ect sens sig
Egr posit sig
Fuel gauge lvl
Fuel tank press sens
G119 (right front of engine block)
Heated oxygen sensor (bank 1 sensor 1) (in exhaust pipe in front of left catalytic converter)
Heated oxygen sensor (bank 1 sensor 3) (in exhaust pipe in back of right catalytic converter)
Heated oxygen sensor (bank 2 sensor 1) (in exhaust pipe in front of right catalytic converter)
Ho2s low
Ho2s sig
Iat sens sig
Idle air ctrl (iac) a hi
Idle air ctrl (iac) b lo
Ign feed
Ignition
Inj 1 ctrl
Inj 2 ctrl
Inj 3 ctrl
Inj 4 ctrl
Inj 5 ctrl
Inj 6 ctrl
Inj 7 ctrl
Inj 8 ctrl
Knock sens sig
Knock sensor (ks) (right side of engine block, below exhaust manifold, forward of starter)
Map sens input
Mass air flow sens sig
Nca
Pnk
Pnk c ignition feed
S148
S149
S162
Sens rtn
Sens sig
Sensor return
Tan
Tcc pwm sol ctrl
Tcc sol ctrl
Temp sens input
Throttle posit sens
Vehicle control module (vcm) (left side of engine compt)
Vehicle speed sensor (left side of transmission, left side of transfer case)
Vent ctlr
Vss rtn
Vss sig
Vss signal

5.0L (VIN M), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 5.0L (VIN M), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500:

1-2 shift sol
2-3 shift sol
3-2 shift sol
Air injection reaction (secondary) pump clutch (on front of pump)
Air injection reaction relay (underhood fuse/ relay center)
Automatic transmission
Aux-b fuse 30a stud-b
Ecm1 fuse 20a
Eng1 k7
Evaporative emissions (evap) canister vent valve (left side of engine compt)
Exhaust gas recirculation (egr) valve (front of engine near thermostat housing)
Fluid pressure (tfp) manual valve position switch
Fluid temperature sensor (internal)
Fuel inj 1
Fuel inj 2
Fuel inj 3
Fuel inj 4
Fuel inj 5
Fuel inj 6
Fuel inj 7
Fuel inj 8
Fuse 20a l8
G119 (right front of engine block)
Heated oxygen sensor (bank 1 sensor 2) (in exhaust pipe in back of left catalytic converter)
Hot at all times
Hot in run & start
Ignition
Nca
Note: fuel injectors are located on top of engine, in intake manifold
Pnk
Pnk pnk pnk tan red
Pressure control solenoid valve
Red
S (w/4l80e trans)
S104
S108
S147
S161
S166 (eng harn, 18 cm from ebcm breakout)
Tcc solenoid
Torque convertor clutch pulse width modulation solenoid
U (w/4l60e trans)
Under hood fuse-relay center
W/4l60e 4-speed trans only

5.0L (VIN M), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 5.0L (VIN M), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500:

(eng harn, approx 17 cm from breakout to egr valve) s106
(engine harn, approx 16 cm from breakout to egr valve)
(engine harn, approx 27 cm in breakout to egr valve)
(inside left frame rail, near rear crossmember) g415
(right top of cylinder head) g120
(taillamp extension harn, 6 cm from the fuel pump harn breakout)
(taillamp extension harness, approx 10 cm from fuel pump balance module breakout)
Automatic transmission input shaft speed (a/t iss) sensor
Balance fuel pump (on inside left frame rail near front of rear tank)
D w/ dual fuel tanks
Engine coolant temperature sensor (top right front of engine, near thermostat housing)
F7 ign e fuse 10a g8
Fuel pump & sender (in fuel tank)
Fuel pump balance module (inside left side of frame rail)
Fuel pump balance relay (on fuel pump balance module)
Fuel pump/ oil pressure switch (top center rear of engine, behind distributor)
Fuel tank pressure sensor (calif only) (in fuel tank)
Fuel tanks
Gauges fuse 4 10a
Hot in off, run or start
Hot in run or start
I/p fuse block
Ignition
Input fuel gauge
Input oil gauge
Input tachometer
Instrument cluster
Intake air temperature sensor (in air intake duct)
M/t only
Map sensor pressure (map) sensor (top right of engine, near fuel injectors)
Mass air flow sensor (in air intake duct)
Output to gauge c2
Pnk
Pnk a
Pnk pnk tan red
Primary tank fuel lvl sig
Relay ctrl
S100
S103
S213
S231
S232
S315
S318
S319
S324
S430
Service engine soon indicator
Speedometer input
Tan
Tan a
Throttle position sensor (on throttle body assembly)
Trans fuse 20 10a
Underhood fuse-relay center pnk
Upshift lamp
W/ dual fuel tanks
W/ dual w/o dual fuel tanks
W/o dual fuel tanks

5.0L (VIN M), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 5.0L (VIN M), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500:

(engine harness, 7 cm from ebcm breakout)
(engine harness, approx 13 cm from s150
(engine harness, approx 7 cm from ebcm breakout)
(i/p harn, 20 cm from inflatable restraint i/p module switch breakout)
(i/p harn, harness, 13 cm from left engine grommet)
(i/p harness, approx 40 cm from instrument cluster breakout)
(or
(right top of cyl head) g120
4wd input
5v ref voltage
A/c comp enable rel
A/c request signal
A/t
Air conditioning system
Air inlet vlv mtr ctlr
Aux fan relay
Brake sw input
Brake switch input
Check eng lp ctrl
Clutch pedal position (cpp) switch (at top of clutch pedal)
Cooling fans system
Cpp sw input
Cruise control module (left rear of engine compartment, on firewall)
Cruise ctrl sig eng
Data link connector (under left side of dash)
Distributor
Ebcm breakout)
Egr vlv feed
Egr vlv ground
Electronic brake control module (ebcm) (on left side of engine compartment)
Est output sig
Evap can purge vlv
Evo/passlock steering control module (center of dash)
F11 ecmb fuse 20a
Force motor feed
Force motor return
Four whl dr sig
Four whl dr sig lo
Fuel a pump prime connector
Fuel level input
Fuel pump relay
Fuel pump rly ctrl
G12
G120 (right top of cylinder head)
Ground
High voltage coil wire
Hot at all times
Hot in run
I/p fuse block
Ign coil out
Ign input
Ign timing sig.
Ignition
Ignition coil (top left rear of engine)
Ignition coil driver (left rear side of engine)
Ignition feed
M/t
M4 brake fuse 18 10a n3
Pnk
Pnk a
Pressure switch input
Radio
Red
S101
S103
S111 (engine harness, approx 10 cm from ebcm breakout)
S151
S152
S153
S221
Sensor ground
Sensor return
Serial data sig
Shift ind lp out
Speed sensor
Speed sensor input
Stoplamp switch (top of brake pedal)
Stoplamp/ clutch switch input
Switch signal
Trans input speed rtn
Trans input speed sig
Transfer case control module (under dash, on steering column support bracket)
Transfer case switch (left top of transfer case)
Transmissions system (four wheel drive indicator circuit)
Underhood fuse- relay center
Vcm sig
Vehicle control module (vcm) (left side of engine compt)
Vss input
Vss sig out

5.7L

5.7L (VIN R), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500:

(attached to right rear of throttle body) idle air control (iac) valve
(bottom front of engine near, crank pulley) crankshaft position sensor
(top right side of engine) evaporative emission canister purge valve
1-2 shift sol ctrl
2-3 shift sol ctrl
3-2 shift sol ctrl
Air pump rel ctrl
Cam posit sens sig
Camshaft position sensor (inside distributor)
Crank posit sens sig
Ect sens sig
Egr posit sig
Fuel gauge lvl
Fuel tank press sens
G119 (right front of engine block)
Heated oxygen sensor (bank 1 sensor 1) (in exhaust pipe in front of left catalytic converter)
Heated oxygen sensor (bank 1 sensor 3) (in exhaust pipe in back of right catalytic converter)
Heated oxygen sensor (bank 2 sensor 1) (in exhaust pipe in front of right catalytic converter)
Ho2s low
Ho2s sig
Iat sens sig
Idle air ctrl (iac) a hi
Idle air ctrl (iac) b lo
Ign feed
Ignition
Inj 1 ctrl
Inj 2 ctrl
Inj 3 ctrl
Inj 4 ctrl
Inj 5 ctrl
Inj 6 ctrl
Inj 7 ctrl
Inj 8 ctrl
Knock sens sig
Knock sensor (ks) (right side of engine block, below exhaust manifold, forward of starter)
Map sens input
Mass air flow sens sig
Nca
Pnk
Pnk c ignition feed
S148
S149
S162
Sens rtn
Sens sig
Sensor return
Tan
Tcc pwm sol ctrl
Tcc sol ctrl
Temp sens input
Throttle posit sens
Vehicle control module (vcm) (left side of engine compt)
Vehicle speed sensor (left side of transmission, left side of transfer case)
Vent ctlr
Vss rtn
Vss sig
Vss signal

5.7L (VIN R), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500:

1-2 shift sol
2-3 shift sol
3-2 shift sol
Air injection reaction (secondary) pump clutch (on front of pump)
Air injection reaction relay (underhood fuse/ relay center)
Automatic transmission
Aux-b fuse 30a stud-b
Ecm1 fuse 20a
Eng1 k7
Evaporative emissions (evap) canister vent valve (left side of engine compt)
Exhaust gas recirculation (egr) valve (front of engine near thermostat housing)
Fluid pressure (tfp) manual valve position switch
Fluid temperature sensor (internal)
Fuel inj 1
Fuel inj 2
Fuel inj 3
Fuel inj 4
Fuel inj 5
Fuel inj 6
Fuel inj 7
Fuel inj 8
Fuse 20a l8
G119 (right front of engine block)
Heated oxygen sensor (bank 1 sensor 2) (in exhaust pipe in back of left catalytic converter)
Hot at all times
Hot in run & start
Ignition
Nca
Note: fuel injectors are located on top of engine, in intake manifold
Pnk
Pnk pnk pnk tan red
Pressure control solenoid valve
Red
S (w/4l80e trans)
S104
S108
S147
S161
S166 (eng harn, 18 cm from ebcm breakout)
Tcc solenoid
Torque convertor clutch pulse width modulation solenoid
U (w/4l60e trans)
Under hood fuse-relay center
W/4l60e 4-speed trans only

5.7L (VIN R), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500:

(eng harn, approx 17 cm from breakout to egr valve) s106
(engine harn, approx 16 cm from breakout to egr valve)
(engine harn, approx 27 cm in breakout to egr valve)
(inside left frame rail, near rear crossmember) g415
(right top of cylinder head) g120
(taillamp extension harn, 6 cm from the fuel pump harn breakout)
(taillamp extension harness, approx 10 cm from fuel pump balance module breakout)
Automatic transmission input shaft speed (a/t iss) sensor
Balance fuel pump (on inside left frame rail near front of rear tank)
D w/ dual fuel tanks
Engine coolant temperature sensor (top right front of engine, near thermostat housing)
F7 ign e fuse 10a g8
Fuel pump & sender (in fuel tank)
Fuel pump balance module (inside left side of frame rail)
Fuel pump balance relay (on fuel pump balance module)
Fuel pump/ oil pressure switch (top center rear of engine, behind distributor)
Fuel tank pressure sensor (calif only) (in fuel tank)
Fuel tanks
Gauges fuse 4 10a
Hot in off, run or start
Hot in run or start
I/p fuse block
Ignition
Input fuel gauge
Input oil gauge
Input tachometer
Instrument cluster
Intake air temperature sensor (in air intake duct)
M/t only
Map sensor pressure (map) sensor (top right of engine, near fuel injectors)
Mass air flow sensor (in air intake duct)
Output to gauge c2
Pnk
Pnk a
Pnk pnk tan red
Primary tank fuel lvl sig
Relay ctrl
S100
S103
S213
S231
S232
S315
S318
S319
S324
S430
Service engine soon indicator
Speedometer input
Tan
Tan a
Throttle position sensor (on throttle body assembly)
Trans fuse 20 10a
Underhood fuse-relay center pnk
Upshift lamp
W/ dual fuel tanks
W/ dual w/o dual fuel tanks
W/o dual fuel tanks

5.7L (VIN R), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500:

(engine harness, 7 cm from ebcm breakout)
(engine harness, approx 13 cm from s150
(engine harness, approx 7 cm from ebcm breakout)
(i/p harn, 20 cm from inflatable restraint i/p module switch breakout)
(i/p harn, harness, 13 cm from left engine grommet)
(i/p harness, approx 40 cm from instrument cluster breakout)
(or
(right top of cyl head) g120
4wd input
5v ref voltage
A/c comp enable rel
A/c request signal
A/t
Air conditioning system
Air inlet vlv mtr ctlr
Aux fan relay
Brake sw input
Brake switch input
Check eng lp ctrl
Clutch pedal position (cpp) switch (at top of clutch pedal)
Cooling fans system
Cpp sw input
Cruise control module (left rear of engine compartment, on firewall)
Cruise ctrl sig eng
Data link connector (under left side of dash)
Distributor
Ebcm breakout)
Egr vlv feed
Egr vlv ground
Electronic brake control module (ebcm) (on left side of engine compartment)
Est output sig
Evap can purge vlv
Evo/passlock steering control module (center of dash)
F11 ecmb fuse 20a
Force motor feed
Force motor return
Four whl dr sig
Four whl dr sig lo
Fuel a pump prime connector
Fuel level input
Fuel pump relay
Fuel pump rly ctrl
G12
G120 (right top of cylinder head)
Ground
High voltage coil wire
Hot at all times
Hot in run
I/p fuse block
Ign coil out
Ign input
Ign timing sig.
Ignition
Ignition coil (top left rear of engine)
Ignition coil driver (left rear side of engine)
Ignition feed
M/t
M4 brake fuse 18 10a n3
Pnk
Pnk a
Pressure switch input
Radio
Red
S101
S103
S111 (engine harness, approx 10 cm from ebcm breakout)
S151
S152
S153
S221
Sensor ground
Sensor return
Serial data sig
Shift ind lp out
Speed sensor
Speed sensor input
Stoplamp switch (top of brake pedal)
Stoplamp/ clutch switch input
Switch signal
Trans input speed rtn
Trans input speed sig
Transfer case control module (under dash, on steering column support bracket)
Transfer case switch (left top of transfer case)
Transmissions system (four wheel drive indicator circuit)
Underhood fuse- relay center
Vcm sig
Vehicle control module (vcm) (left side of engine compt)
Vss input
Vss sig out

6.5L

6.5L (VIN F), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500:

(bottom front of engine, near crank pulley) crankshaft position (ckp) sensor
(engine harn, 31 cm from taillamp harn breakout)
(engine harness)
(i/p harness)
(i/p harness, approx 16 cm into i/p cluster breakout)
(right top of cylinder head) g119
(top of engine,
(top right front of engine) engine coolant temperature (ect) sensor
12v
3/2 shift sol
4wd signal
5 volt ref
5 vref
5v ref volt
A/c request sig
A/c system
A/t fluid pressure (tfp) manual valve position switch
A10
A11 3 mode cruise a12
Anti-lock brakes system
App 1 sig
App 2 sig
App 3 sig
Automatic transmission
Automatic transmission input shaft speed (a/t iss) sensor (left side of transmission near front)
B10
B11
B12
Baro sensor input
Boost pressure sensor
Brake sw in
Brake switch input
C10
C11
C12
C13
C14
C15
C16
Cam posit sens sig rtn
Camshaft posit sens
Closure gnd
Cruise control
Cruise ctrl sw engage
Cruise eng sw retard
D10
D11
D12
D13
D14
D15
D16
Ect temp sens in
Engine crank sens input
Exhaust gas recirculation (egr) control/ barometric (baro) pressure sensor (left side of firewall, near wiper motor)
Force mtr hi
Force mtr low
Fuel pump input
Fuel pump rly ctrl
Fuel sol closure (5v sig)
Fuel temp sens (5v sig)
Glow plug "wait" lp out
Glow plug relay
Ground
Intake man air temp sens
Map sens input
Nca
Near intake manifold) intake air temperature (iat) sensor
On/off
Pnk
Powertrain control module (pcm) (behind right side of dash, near blower motor)
Pressure control solenoid valve
Radio
Range mode sel a
Range mode sel b
Range mode sel c
Red
Resume
S140
S170
S199
S211
S215
S230
Sensor gnd
Set
Shift sol a
Shift sol b
Switch
Tan
Timing stepper mtr (high)
Timing stepper mtr (low)
Transmission speed input
Transmission temp input
Transmission temperature sensor
Transmissions system
Vehicle speed input
Vehicle speed sensor (on transmission, left rear side)
Vehicle speed sensor buffer (behind right side of dash)
Vss hi
Vss output
Vss rtn
Vss sig

6.5L (VIN F), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500:

(engine harness, approx 4 cm from i/p harness breakout) (a/t) (i/p harn, 20 cm from inflatable restraint i/p module switch breakout) (m/t)
(engine jumper harness, toward fuel temperature sensor)
(on inj pump)
5 volt ref
Accelerator pedal position (app) module (part of accelerator pedal)
Brake switch assembly (at rear of brake pedal support bracket)
Clutch pedal position (cpp) switch (m/t only) (top of clutch pedal)
Cmp sig
D2 trans fuse 20 20a e1
D8 stop/haz fuse 1 20a c7
Ecm-1 h7
Electronic brake control module (on left side of engine compt)
Engine shutoff solenoid (left front of engine)
Fuel solenoid (on inj pump, top front of engine)
Fuel solenoid driver (on inj pump, top front of engine)
Fuse 20a
High res sig
Hot at all times
Hot in run
Hot in run or start
I/p fuse block
Injection timing stepper motor (top right front of engine)
M4 brake fuse 18 10a n3
Nca
Optical fuel temperature sensor (on fuel inj pump)
Pnk
Pnk pnk
Power distribution system
Red
S190
S198
S220 (i/p harness, approx 6 cm from steering column breakout)
S222 (m/t) s152 (a/t)
S299
Sens grd
Tan d
Underhood fuse-relay center

6.5L (VIN F), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500:

(engine harness, approx 37 cm from breakout to ebcm) (m/t) (engine harness, approx 31 cm from taillamp harn breakout) (a/t) s100
(inside left frame rail, below driver's door)
(right top of cylinder head)
(right top of cylinder head) g119
(taillamp extension harness, approx 10 cm from fuel pump balance module breakout)
Ecm-b fuse 20a
F11
Fuel lift pump
Fuel pump prime connector
Fuel pump relay (in underhood fuse-relay center)
Fuel pump/ oil pressure switch and sender (under intake manifold, center of engine)
G119
G12
Gauges fuse 4 10a
Hot at all times
Hot in run or start
I/p fuse block
Instrument cluster
Instrument cluster system
Instrument cluster system (fuel pump balance relay)
Pnk
Red
S101
S103
S147
S213
S318
Service engine soon indicator
Service throttle soon indicator
Tan
Underhood fuse-relay center
Vehicle speed input
W/dual tanks
W/o dual tanks
Wait to start "glow plugs" indicator
Water in fuel indicator
Water in-fuel sensor (top center rear of engine)

6.5L (VIN F), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500:

"serv eng soon" ind
"serv throttle soon" ind
(at air intake duct) mass air flow (maf) sensor
(below dash, near steering column)
(eng jumper harn, from fuel solenoid driver)
(engine harness)
(engine harness, approx 11 cm from i/p harness breakout)
(engine harness, approx 13 cm into ebcm breakout)
(right top of cylinder head) g119
12v battery (fused)
12v battery fused
3/2 ctrl out
A/c enable
A/c system
C10
C11
C12
C13
C14
C15
C16
D10
D11
D12
D13
D14
D15
D16
Data link connector (dlc)
Egr sol output
Egr valve sol putput
Electronic brake brake control module (ebcm) (on left side of engine compt)
Eng-i k7
Engine shutoff sol out
Exhaust gas recirculation (egr) vent solenoid (top left rear of engine)
Exhaust gas recirculation egr solenoid (top left rear of engine)
Fuel heater (top rear of engine)
Fuel sol module (5 vref)
Fuel sol module feed
Fuse 20a
Fusible link
Fusible links
G119 (right top of cylinder head)
Glow plug 1
Glow plug 2
Glow plug 3
Glow plug 4
Glow plug 5
Glow plug 6
Glow plug 7
Glow plug 8
Glow plug output
Glow plug relay (top left rear of engine)
Grd
Ground
Hot at all times
Hot in run or start
Ign
Ignition
Maf
Pcm gnd
Pnk
Powertrain control module (pcm) (behind right side of dash, near blower motor)
Red
Relay ctrl
S103
S108
S137
S138
S147
S150
S191
S269
Serial data sig
Shift sol a input
Shift sol b input
Signal
Tan
Tps 2 ref voltage
Underhood fuse-relay center
Wait to start ind
Wastegate sol
Wastegate solenoid (top left rear of engine)

6.5L (VIN S), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500:

(bottom front of engine, near crank pulley) crankshaft position (ckp) sensor
(engine harn, 31 cm from taillamp harn breakout)
(engine harness)
(i/p harness)
(i/p harness, approx 16 cm into i/p cluster breakout)
(right top of cylinder head) g119
(top of engine,
(top right front of engine) engine coolant temperature (ect) sensor
12v
3/2 shift sol
4wd signal
5 volt ref
5 vref
5v ref volt
A/c request sig
A/c system
A/t fluid pressure (tfp) manual valve position switch
A10
A11 3 mode cruise a12
Anti-lock brakes system
App 1 sig
App 2 sig
App 3 sig
Automatic transmission
Automatic transmission input shaft speed (a/t iss) sensor (left side of transmission near front)
B10
B11
B12
Baro sensor input
Boost pressure sensor
Brake sw in
Brake switch input
C10
C11
C12
C13
C14
C15
C16
Cam posit sens sig rtn
Camshaft posit sens
Closure gnd
Cruise control
Cruise ctrl sw engage
Cruise eng sw retard
D10
D11
D12
D13
D14
D15
D16
Ect temp sens in
Engine crank sens input
Exhaust gas recirculation (egr) control/ barometric (baro) pressure sensor (left side of firewall, near wiper motor)
Force mtr hi
Force mtr low
Fuel pump input
Fuel pump rly ctrl
Fuel sol closure (5v sig)
Fuel temp sens (5v sig)
Glow plug "wait" lp out
Glow plug relay
Ground
Intake man air temp sens
Map sens input
Nca
Near intake manifold) intake air temperature (iat) sensor
On/off
Pnk
Powertrain control module (pcm) (behind right side of dash, near blower motor)
Pressure control solenoid valve
Radio
Range mode sel a
Range mode sel b
Range mode sel c
Red
Resume
S140
S170
S199
S211
S215
S230
Sensor gnd
Set
Shift sol a
Shift sol b
Switch
Tan
Timing stepper mtr (high)
Timing stepper mtr (low)
Transmission speed input
Transmission temp input
Transmission temperature sensor
Transmissions system
Vehicle speed input
Vehicle speed sensor (on transmission, left rear side)
Vehicle speed sensor buffer (behind right side of dash)
Vss hi
Vss output
Vss rtn
Vss sig

6.5L (VIN S), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500:

(engine harness, approx 4 cm from i/p harness breakout) (a/t) (i/p harn, 20 cm from inflatable restraint i/p module switch breakout) (m/t)
(engine jumper harness, toward fuel temperature sensor)
(on inj pump)
5 volt ref
Accelerator pedal position (app) module (part of accelerator pedal)
Brake switch assembly (at rear of brake pedal support bracket)
Clutch pedal position (cpp) switch (m/t only) (top of clutch pedal)
Cmp sig
D2 trans fuse 20 20a e1
D8 stop/haz fuse 1 20a c7
Ecm-1 h7
Electronic brake control module (on left side of engine compt)
Engine shutoff solenoid (left front of engine)
Fuel solenoid (on inj pump, top front of engine)
Fuel solenoid driver (on inj pump, top front of engine)
Fuse 20a
High res sig
Hot at all times
Hot in run
Hot in run or start
I/p fuse block
Injection timing stepper motor (top right front of engine)
M4 brake fuse 18 10a n3
Nca
Optical fuel temperature sensor (on fuel inj pump)
Pnk
Pnk pnk
Power distribution system
Red
S190
S198
S220 (i/p harness, approx 6 cm from steering column breakout)
S222 (m/t) s152 (a/t)
S299
Sens grd
Tan d
Underhood fuse-relay center

6.5L (VIN S), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500:

(engine harness, approx 37 cm from breakout to ebcm) (m/t) (engine harness, approx 31 cm from taillamp harn breakout) (a/t) s100
(inside left frame rail, below driver's door)
(right top of cylinder head)
(right top of cylinder head) g119
(taillamp extension harness, approx 10 cm from fuel pump balance module breakout)
Ecm-b fuse 20a
F11
Fuel lift pump
Fuel pump prime connector
Fuel pump relay (in underhood fuse-relay center)
Fuel pump/ oil pressure switch and sender (under intake manifold, center of engine)
G119
G12
Gauges fuse 4 10a
Hot at all times
Hot in run or start
I/p fuse block
Instrument cluster
Instrument cluster system
Instrument cluster system (fuel pump balance relay)
Pnk
Red
S101
S103
S147
S213
S318
Service engine soon indicator
Service throttle soon indicator
Tan
Underhood fuse-relay center
Vehicle speed input
W/dual tanks
W/o dual tanks
Wait to start "glow plugs" indicator
Water in fuel indicator
Water in-fuel sensor (top center rear of engine)

6.5L (VIN S), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500:

"serv eng soon" ind
"serv throttle soon" ind
(at air intake duct) mass air flow (maf) sensor
(below dash, near steering column)
(eng jumper harn, from fuel solenoid driver)
(engine harness)
(engine harness, approx 11 cm from i/p harness breakout)
(engine harness, approx 13 cm into ebcm breakout)
(right top of cylinder head) g119
12v battery (fused)
12v battery fused
3/2 ctrl out
A/c enable
A/c system
C10
C11
C12
C13
C14
C15
C16
D10
D11
D12
D13
D14
D15
D16
Data link connector (dlc)
Egr sol output
Egr valve sol putput
Electronic brake brake control module (ebcm) (on left side of engine compt)
Eng-i k7
Engine shutoff sol out
Exhaust gas recirculation (egr) vent solenoid (top left rear of engine)
Exhaust gas recirculation egr solenoid (top left rear of engine)
Fuel heater (top rear of engine)
Fuel sol module (5 vref)
Fuel sol module feed
Fuse 20a
Fusible link
Fusible links
G119 (right top of cylinder head)
Glow plug 1
Glow plug 2
Glow plug 3
Glow plug 4
Glow plug 5
Glow plug 6
Glow plug 7
Glow plug 8
Glow plug output
Glow plug relay (top left rear of engine)
Grd
Ground
Hot at all times
Hot in run or start
Ign
Ignition
Maf
Pcm gnd
Pnk
Powertrain control module (pcm) (behind right side of dash, near blower motor)
Red
Relay ctrl
S103
S108
S137
S138
S147
S150
S191
S269
Serial data sig
Shift sol a input
Shift sol b input
Signal
Tan
Tps 2 ref voltage
Underhood fuse-relay center
Wait to start ind
Wastegate sol
Wastegate solenoid (top left rear of engine)

7.4L

7.4L (VIN J), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C1998 2500:

(attached to right rear of throttle body) idle air control (iac) valve
(bottom front of engine, near crank pulley) crankshaft position sensor
(engine harness, approx 11 cm into egr valve breakout)
(right side of engine) evaporative emission canister purge valve
1-2 shift sol ctrl
2-3 shift sol ctrl
Air pump relay ctrl
Cam posit sens sig
Camshaft position sensor (inside distributor)
Crank posit sens sig
Ect sens sig
Egr posit sig
Evap sol purge ctrl
Fuel lvl output
Fuel tank pressure
G119 (right front of engine block)
Heated oxygen sensor (ho2s) (bank 2 sensor 1) (in exhaust pipe in front of left catalytic converter)
Heated oxygen sensor (ho2s) (bank 2 sensor 2) (in exhaust pipe in back of right catalytic converter)
Heated oxygen sensor (ho2s) (bank 2 sensor1) (in exhaust pipe in front of right catalytic converter)
Ho2s high
Ho2s low
Iat sens sig
Idle air ctrl (iac) a hi
Idle air ctrl (iac) b lo
Ign feed
Ignition
Inj 1 ctrl
Inj 2 ctrl
Inj 3 ctrl
Inj 4 ctrl
Inj 5 ctrl
Inj 6 ctrl
Inj 7 ctrl
Inj 8 ctrl
Knock sens sig
Knock sensor (right side of engine)
Map sens input
Mass air flow sens sig
Nca
Pnk
Pnk c ignition feed
S145
S148
S149
S162
Sens rtn
Sens sig
Sensor return
Tan
Tcc sol ctrl
Temp sens input
Throttle posit sens
Vehicle control module (vcm) (left side of engine compt)
Vehicle speed sensor (left side of transmission, left side of transfer case)
Vent ctrl
Vss rtn
Vss sig
Vss signal

7.4L (VIN J), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C1998 2500:

1-2 shift solenoid
2-3 shift solenoid
Air injection reaction (a.i.r.) pump clutch (front of engine)
Air injection reaction (a.i.r.) relay (underhood fuse/ relay center)
Automatic transmission
Ecm-1 fuse 20a
Eng-1 k7
Evaporative emissions (evap) canister vent (left side of eng compt)
Exhaust gas recirculation (egr) valve (front of engine near thermostat housing)
Fluid pressure (tfp) manual valve position switch
Fluid temperature sensor (internal)
Fuel inj 1
Fuel inj 2
Fuel inj 3
Fuel inj 4
Fuel inj 5
Fuel inj 6
Fuel inj 7
Fuel inj 8
Fuse 20a l8
G119 (right front of engine block)
Heated oxygen sensor (ho2s) (bank 1 sensor 2) (in exhaust pipe in back of left catalytic converter)
Hot in run or start
Ignition
Nca
Note: fuel injectors are located on top of engine, in intake manifold
Pnk
Pnk pnk pnk tan pnk pnk
Pressure control solenoid valve
Red
S104
S108
S147
S154
S155
Tan
Torque convertor clutch pulse width modulation solenoid
Under hood fuse-relay center

7.4L (VIN J), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C1998 2500:

(eng harn, 23 cm from ebcm breakout)
(engine harn, approx 4cm in breakout to egr valve)
(engine harness, approx 4.5 cm from breakout to egr valve)
(inside left frame rail, near rear crossmember) g415
(right front of engine, near thermostat housing) g119
(right top of cyl head) g120
(right top of cylinder head) g120
(taillamp extension harn, 6 cm from fuel pump harn breakout)
Automatic transmission input shaft speed (a/t iss) sensor
Balance fuel pump (on inside left frame rail near front of rear tank)
Convenience center
Engine coolant temperature sensor (top right front of engine, near thermostat housing)
Fuel pump and sender (in fuel tank)
Fuel pump balance module (inside left side of frame rail)
Fuel pump balance relay (on fuel pump balance module)
Fuel pump/ oil pressure switch (top left rear of engine, near distributor)
Fuel tank pressure sensor (in fuel tank)
Gauges fuse 4 10a
Hot in off, run or start
Hot in run or start
Hot in run, or start
I/p fuse block
Ign e fuse 10a
Ignition
Input fuel gauge
Input oil gauge
Input tachometer
Instrument cluster
Intake air temperature sensor (in air intake duct)
M/t only
Map sensor (top right of engine, rear of fuel injectors)
Mass air flow sensor (air intake duct)
Out to gauge
Pnk
Pnk a
Pnk pnk tan pnk pnk
Primary tank fuel level signal c1
Red
Relay ctrl
S100
S103
S106
S146
S213
S231 (engine harn, approx 7-18 cm from breakout to egr valve)
S232
S315
S318
S319
S430
Service engine soon indicator
Speedometer input
Taillamp ext harn, approx 10 cm from fuel pump bal module breakout)
Tan
Tan a
Throttle position sensor (on throttle body assembly)
Trans fuse 20 10a
Underhood fuse-relay center pnk
Upshift lamp
W/ calif
W/ dual fuel tanks
W/dual fuel tanks
W/o dual fuel tanks

7.4L (VIN J), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C1998 2500:

(engine harn, 7 cm from ebcm breakout)
(engine harness, approx 13 cm into s150
(engine harness, approx 7 cm into ebcm breakout)
(i/p harn, 20 cm from inflatable restraint i/p module switch breakout)
(i/p harness, approx 40 cm from i/p cluster breakout)
(or
(right top of cylinder head) g120
4wd input
5v ref. voltage
A/c comp rly ctrl
A/c request signal
A/t
Air conditioning system
Aux fan relay
Brake sw input
Brake switch assembly (top of brake pedal)
Brake switch input
Check eng lp ctrl
Clutch pedal position switch (at top of clutch pedal)
Cooling fans system
Cpp sw out
Cruise control module (left rear of engine compartment, on firewall)
Cruise ctrl sig eng
Data link connector (under left side of dash)
Distributor
Ebcm breakout)
Ecm-b f11
Egr cyl feed
Egr vlv grd
Electronic brake control module (ebcm) (left side of engine compartment)
Est output sig
Evo/passlock control module (center of dash)
Force motor feed
Force motor return
Four whl dr sig
Four whl dr sig lo
Fuel a pump prime connector
Fuel lvl input
Fuel pump relay
Fuel pump rly ctrl
Fuse 20a g12
G120 (right top of cylinder head)
Ground
High voltage coil wire
Hot at all times
Hot in run
I/p fuse block
Ign coil out
Ign input
Ign timing sig.
Ignition
Ignition coil (top left rear of engine)
Ignition coil driver (top left rear of engine)
Ignition feed
Inlet air actuator
M/t
M4 brake fuse 18 10a n3
Pnk
Pnk a
Pressure switch input
Radio
Red
S101
S103
S111 (engine harness, approx 7 cm from ebcm breakout)
S151
S152
S153
S221
S222
Sensor ground
Sensor return
Serial data sig
Shift ind lp out
Speed sensor
Speed sensor input
Stoplamp/ clutch switch input
Switch signal
Trans input speed rtn
Trans input speed sig
Transfer case control module (under dash, on steering column support bracket)
Transfer case switch (left top of transfer case)
Transmissions system (four wheel drive indicator circuit
Underhood fuse- relay center
Vcm sig
Vehicle control module (vcm) (left side of engine compt)
Vss input
Vss sig out

EXTERIOR LIGHTS

Backup Lamps Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Backup Lamps Wiring Diagram for GMC Cab & Chassis C1998 2500:

(left side of transmission) backup lamp switch
A/t
Backup lamps signal (trailer tow package) (wire cut and taped to harness)
G415 (left frame rail, behind bumper)
Hot in run or start
I/p fuse block
Left backup lamp
M/t
Mirrors system
Park/neutral position switch (left center of transmission)
Pnk
Right backup lamp
S411
S414
Turn b/u fuse 16 20a

Exterior Lamps Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Exterior Lamps Wiring Diagram for GMC Cab & Chassis C1998 2500:

(dash harness, 12 cm from steering column breakout) s210
(dash harness, 4cm into instrument cluster breakout) s267
(dash harness, 8cm into instrument cluster breakout) s214
(forward lamps harn, 7cm from left headlamp breakout) s122
(forward lamps harness, 5cm from right headlamp breakout) s127
(front to rear body harness, near chmsl harness breakout)
(license lamp harness, 15cm from left license lamp toward taillamp breakout) s415
(rear lamps harn, 28cm from trailer harness breakout) (w/ trailer pkg) s413
(rear lamps harness, near taillamps extension harness break- out) s412
Auxiliary lead (taped to harness)
Backup lights circuit
Cab clearance lamps
Cargo lamp
Cargo lamp switch
Center high mount stop lamp
Chmsl lp
Column harness breakout)
Cr lp
Cruise control system
Ctsy fuse 20a
Fuse block
G108 (left radiator support, near left headlamp)
G119 (right front of engine block)
G1o1 (right inner fender, below underhood reel lamp)
G201 (right side of dash)
G202 (behind left side of dash)
G305 (right "b" pillar)
G415 (left frame rail, behind bumper)
H9 turn pwr h8 haz pwr h7 flshr out g8 gnd
Hazard
Headlamp & panel dimmer switch
Headlights system
Hot at all times
Hot in run, bulb test or start
I/p fuse block
Instru- ment cluster
Interior lights system
Left
Left front marker lamp
Left front park/ turn lamps
Left tail/ stop/ turn lamp
Left turn indic
License lamp
License lamps
Maxi fuse 30a
Nca
Normal
Off
Park
Park lps fuse 9 20a
Pickup
Pnk
Rear clearance lamps circuit
Red
Rheo- stat
Right
Right front marker lamp
Right front park/ turn lamps
Right tail/ stop/ turn lamp
Right turn indic
S107
S119 (forward lamps harn, 20cm from washer pump breakout)
S123
S128
S204
S215
S242
S259
S299
S316
S411
S416
S419
S421 (rear lamp harness, 7cm from license lamp breakout)
S422 (rear lamp harn, 7cm from trailer harness breakout)
S424
Stop- lamp relay (except subur- ban/ utility)
Stop/ haz fuse 1 20a
Suburban/ utility
Tcc/ stop lamp switch (top of brake pedal)
Trailer towing adapter (wires are cut and taped to harness)
Turn- b/u fuse 16 15a
Turn/ hazard switch
Turn/hazard flasher (convenience center: under left side of dash)
Under- hood fuse relay center (left rear of engine compt.)
Under- hood fuse- relay center (left rear of engine compt.)
W/ dual rear wheels
W/ step bumper
W/o step bumper

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 4) for GMC Cab & Chassis C1998 2500

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List of elements for Ground Distribution Wiring Diagram (1 of 4) for GMC Cab & Chassis C1998 2500:

(i/p harness, approx 24 cm from instrument cluster breakout)
(left front of intake manifold)
(right front of engine)
A16
Ashtray lamp
Audio alarm module
Automatic transfer case control module
Automatic transfer case select switch
Auxiliary cooling fan motor
Auxiliary heater control switch (suburban/ utility)
Auxiliary power outlet
Btsi ground
C10
Cargo lamp switch (pickup)
Cigar lighter
Convenience center
D10
D12
D13
Data link connector
Daytime running lamps module
Fog lamp switch
Front windshield wiper/ washer pump motor
G101 (right front wheelhouse)
G101 (right inner fender, below underhood reel lamp)
G105 (right rear of engine compt)
G108 (left radiator support, near left headlamp)
G110 (diesel)
G117 (right rear of engine)
G119 (gasoline)
G202 (behind left side of dash)
Headlamp and panel dimmer switch
Heater and a/c control switch
Hvac control module
I/p compartment lamp
Ignition switch ground
Inflatable restraint i/p module enable switch
Left battery
Left fog lamp
Left front door jamb switch
Left front park/ turn lamp
Left high beam headlamp
Left high/ low beam headlamp
Left horn
Left low beam headlamp
Low coolant level indicator module
Radio
Rear liftgate release switch (suburban/ utility)
Rear window washer pump motor
Rear window wiper/ washer switch
Rear window wiper/ washer switch (suburban/ utility)
Right fog lamp
Right front door jamb switch
Right front park/ turn lamp
Right high beam headlamp
Right high/ low beam headlamp
Right horn
Right low beam headlamp
S123 (forward lamps harness, approx 20 cm from left park/lamp breakout)
S128 (forward lamps harness, approx 5 cm from right headlamp breakout)
S158 (in washer pump jumper harness)
S204 (i/p harness, approx 8 cm from dlc harness breakout)
S218 (i/p harness, aprrox 16 cm from radio harness breakout)
S298
Spare
Spot lamp
Spot lamp relay
Steering column ground
To s316 (diagram 3 of 4)
Transfer case control module
Transfer case select switch
Turn/ hazard flasher
Uncoated
W/ dual horns
W/ quad headlamps
Windshield wiper motor module

Ground Distribution Wiring Diagram (2 of 4) for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for Ground Distribution Wiring Diagram (2 of 4) for GMC Cab & Chassis C1998 2500:

(4wd harness, approx 10 cm from transfer case relay breakout)
(engine harness, 8-16 cm from a/c compressor clutch connector)
(engine harness, approx 16 cm into vehicle speed sensor breakout)
(i/p harness, approx 8 cm from i/p cluster breakout)
(oxygen sensor jumper harness, approx 22 cm into harness)
(right front of engine block) g119
87a
A/c compressor clutch
A/c compressor clutch relay
A/c compressor cycling switch
A/c compressor pressure switch
A/c low pressure switch
Air injection reactor pump (7.4l only)
Automatic transfer case module
Blower motor
Brake pressure warning switch
Cruise control module
Data link connector
Diesel
E16
Electronic brake control module
Evo passlock module
Except suburban/ utility
Front axle actuator
Fuel heater
Fuel pump and sender
Fuel pump balance module
Fuel pump relay
G131 (near thermostat housing)
G134 (front top of engine)
Gasoline
Glow plug relay
Heated oxygen sensor bank 1 sensor 1
Heated oxygen sensor bank 1 sensor 2
Heated oxygen sensor bank 1 sensor 3
Heated oxygen sensor bank 2 sensor 2
Ignition coil module
Instrument cluster
Low coolant level sensor
Mass airflow sensor
Park/ neutral position switch
S103 (vin j-engine harness, approx 12 cm from fuel injector breakout, except vin j-engine harness, approx 11 cm from breakout to egr valve)
S107 (vin j-engine harness, approx 18 cm from fuse-relay center breakout, except vin j-engine harness, 25-35 cm from breakout to egr valve)
S147 (vin j-engine harness, approx 5 cm from fuel injector breakout, except vin j-engine harness, approx 6 cm from egr breakout)
S149
S156
S162 (except vin j-engine harness, approx 17 cm from starter solenoid breakout, vin j-engine harness, approx 41 cm from left oxygen sensor breakout)
S185
S186
S215
S302
S317 (taillamp extension harness, approx 10 cm from fuel pump and sender breakout)
Secondary fuel gage sender
Starter relay
Stoplamp relay
Trans range switch
Transfer case relay
Under- hood lamp
Under- hood reel lamp
Underhood fuse- relay center
Underhood reel lamp
Vehicle control module
Vehicle speed sensor
W/ dual tanks
W/o dual tanks
Water in fuel sensor
Water valve (suburban/ utility)

Ground Distribution Wiring Diagram (3 of 4) for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for Ground Distribution Wiring Diagram (3 of 4) for GMC Cab & Chassis C1998 2500:

(crossbody harness, approx 12cm right of left door harness breakout)
(hvac harn, approx 8cm from recirculation door breakout s244
(i/p harness, approx 8 cm from i/p cluster breakout)
(inside left front door harness, near tweeter)
(power lumbar seat jumper, approx 20 cm from right power seat breakout)
A/t only
Automatic transfer case control module
Bench seat
Blower motor relay (high)
Cargo lamp
Center high mount stop- lamp
Data link connector
Diesel
Door lock relay
Electrochromic rearview mirror w/ compass
Evo passlock module
Four-wheel drive indicator lamp
From s204 (diagram 1 of 4)
Front blower motor
Fuel gage sender
Fuel pump and sender
Fuel pump balance module
Fuel pump relay
G134 (front top of engine)
G201 (right side of dash)
G416 (inside left framerail, near rear crossmember)
Instrument cluster
Interior lamp control module
Left clearance lamp
Left front power window switch
Left front seat belt switch
Left illuminated vanity mirror
Left power lumbar support motor
Left power seat switch seat
Left rear power window switch
Mass airflow sensor
Mode door motor
Others
Power amplifier
Power amplifier relay
Power lumbar motor
Power outside rearview mirror switch
Power seat adjuster switch
Powertrain control module
Rear window lockout switch
Recirculation door motor
Remote control door lock receiver
Right clearance lamp
Right front power seat lumbar motor
Right front power window switch
Right front seat belt switch
Right illuminated vanity mirror
Right rear power window switch
Roof marker lamps
S103 (engine harness, approx 11 cm from breakout to right side glow plugs)
S215
S251
S259 (crossbody harness, approx 6 cm into seat belt switch breakout)
S303
S316 (vanity mirror jumper harness, approx 10 cm toward left illuminated vanity mirror)
S317 (taillamp extension harness, approx 10 cm from fuel gage sender breakout)
S319 (taillamp extension harn, approx 7cm from fuel pump and sender breakout)
S500
Secondary fuel gage sender
Temperature door motor
Transfer case mode selector illumination lamp
Under- hood fuse- relay center
Vehicle speed sensor buffer
W/ dual tanks

Ground Distribution Wiring Diagram (4 of 4) for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for Ground Distribution Wiring Diagram (4 of 4) for GMC Cab & Chassis C1998 2500:

(license lamps harness, approx 4 cm from tail- lamp harness breakout)
(rear heat and a/c harness, 7 cm from blower motor resistor breakout)
(rear lamps harness, 17-33 cm from taillamps extension breakout)
Air pump (5.7l)
Auxiliary blower motor
Auxiliary heater- a/c logic module
Auxiliary mode door motor
Auxiliary temp door motor
Center high mount stoplamp
Diesel chassis cab & heavy duty
Diesel except chassis cab & heavy duty
Door contact button
Door lock control module (w/ cargo doors)
Endgate marker lamps
Front auxiliary heater-a/c control module
Front dome lamp
G110 (left front of engine)
G202 (left side of dash)
G305 (right 'b' pillar)
G415 (frame ground, rear of vehicle)
G415 (left frame rail, behind bumper)
Inflatable restraint front end sensor
Inflatable restraint sensing and diagnostic module
Left cargo door defogger grid
Left front clearance lamp
Left license lamp
Left rear clearance lamp
Left rear fender
Left rear tail, stop, license, turn & backup lamps
Left rear tail, stop, turn & backup lamps
Left tail, stop, turn & backup lamps
Overhead console lamps
Pickup w/ dual rear wheels
Rear auxiliary heater-a/c control module
Rear dome lamp
Rear door jamb switch
Rear liftgate window defogger grid
Rear wiper motor module
Right cargo door defogger grid
Right front clearance lamp
Right license lamp
Right rear clearance lamp
Right rear fender
Right rear tail, stop, license, turn & backup lamps
Right rear tail, stop, turn & backup lamps
Right tail, stop, turn & backup lamps
S167 (engine harn, near g110)
S307 (rear hvac control harness, approx 10 cm from hvac logic module breakout)
S403
S410 (utility-front to rear lamps harness, 12-22 cm from right rear door speaker breakout, suburban-front to rear body harness, 12-22 cm from right rear door speaker breakout)
S411
S411 (rear lamps harness, 17-33 cm from taillamps extension breakout)
S416
Suburban & utility
Trailer ground (taped back)
Utility only

HEADLIGHTS

Headlight Wiring Diagram, with Quad Headlamps for GMC Cab & Chassis C1998 2500

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List of elements for Headlight Wiring Diagram, with Quad Headlamps for GMC Cab & Chassis C1998 2500:

(forward lamps harn, approx 12cm from left headlamp breakout toward windshield washer pump)
(i/p harn, near strng col harn breakout; except 1998 gas) (i/p harn, near auxiliary power outlet; 1998 gas)
Acc
Brake ind ctrl
Brake warn in
Bulb test
Convenience center (under left side of dash)
Daytime running lamps module (behind left side of dash)
Daytime running lamps relay
Diode 203 (i/p harness, right side of steering column)
Drl indicator
Drl relay ctrl
Drl-fog fuse 15 20a
Exterior lights system
Fog lamp relay
Fog lamp switch
G101 (right inner fender)
G101 (right inner fender, below underhood reel lamp)
G108 (left radiator support)
G134 (front top of engine)
G202 (behind left side of dash)
Gages fuse 4 10a
Ground
Head
Head- lamp dimmer switch
Headlamp and panel dimmer switch
High beam indicator
Hot at all times
Hot in run, bulb test or start
I/p fuse block (left side of dash)
Ignition
Ignition switch
Illum lamp
Ind bulb chk
Instrument cluster
Instrument cluster system (brake warning indicator)
Interior lights system
Lamp feed
Left fog lamp
Left high beam head- lamp
Left low beam head- lamp
Lighting fuse 8 50a
Lock
Nca
Off
On indicator
Park
Park brake sig
Park brake warning switch
Pk lps fuse 9 20a
Pnk
Red
Red c
Right fog lamp
Right high beam head- lamp
Right low beam head- lamp
Run
S120 (forward lamps harn, near windshield washer pump breakout toward left hdlp)
S121
S123
S125 (i/p harn, approx 13cm from left rear engine compt grommet towards forward lamps harn; except 1998 diesel) (i/p harn, approx 20cm from cluster breakout; 1998 diesel)
S128
S204
S205
S210
S213
S215
S298
Start
Tan
Underhood fuse/relay center (left rear of engine compt)
W/ fog lamps

Headlight Wiring Diagram, with Sealed Beam Headlamps for GMC Cab & Chassis C1998 2500

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List of elements for Headlight Wiring Diagram, with Sealed Beam Headlamps for GMC Cab & Chassis C1998 2500:

(forward lamps harn, approx 12cm from left headlamp breakout toward windshield washer pump)
(high)
(i/p harn, near strng col harn breakout; except 1998 gas) (i/p harn, near auxiliary power outlet; 1998 gas)
(low)
Acc
Brake ind ctrl
Brake warn in
Bulb test
Convenience center (under left side of dash)
Daytime running lamps module (behind left side of dash)
Daytime running lamps relay
Diode 203 (i/p harness, right side of steering column)
Drl indicator
Drl relay ctrl
Drl-fog fuse 15 20a
Exterior lights system
Fog lamp relay
Fog lamp switch
G101 (right inner fender)
G101 (right inner fender, below underhood reel lamp)
G108 (left radiator support)
G134 (front top of engine)
G202 (behind left side of dash)
Gages fuse 4 10a
Ground
Head
Head- lamp dimmer switch
Headlamp and panel dimmer switch
High beam indicator
Hot at all times
Hot in run, bulb test or start
I/p fuse block (left side of dash)
Ignition
Ignition switch
Illum lamp
Ind bulb chk
Instrument cluster
Instrument cluster system (brake warning indicator)
Interior lights system
Lamp feed
Left fog lamp
Left head- lamp
Lighting fuse 8 50a
Lock
Nca
Off
On indicator
Park
Park brake sig
Park brake warning switch
Pk lps fuse 9 20a
Pnk
Red
Red c
Right fog lamp
Right head- lamp
Run
S120 (forward lamps harn, near windshield washer pump breakout toward left headlamp)
S121
S123
S125 (i/p harn, approx 13cm from left rear engine compt grommet towards forward lamps harn; except 1998 diesel) (i/p harn, approx 20cm from cluster breakout; 1998 diesel)
S128
S204
S205
S210
S213
S215
S298
Start
Tan
Tan c
Underhood fuse/relay center (left rear of engine compt)
W/ fog lamps

HORN

Horn Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Horn Wiring Diagram for GMC Cab & Chassis C1998 2500:

(forward lamps harn, 26.5 cm from left headlamp breakout) s124
Base
C100
C102
C242
C244
C266
Convenience center
G101 (right inner fender, below underhood reel lamp)
Horn fuse 20a
Horn relay
Horn slip ring
Horn switch
Hot at all times
Jumper wire
Left horn (front of vehicle)
Nca
Police package
Remote control door lock receiver
Right horn (front of vehicle) (w/front end appearance package only)
S128
Steering wheel
Underhood fuse/relay center

INSTRUMENT CLUSTER

5.0L

5.0L (VIN M), Instrument Cluster Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 5.0L (VIN M), Instrument Cluster Wiring Diagram for GMC Cab & Chassis C1998 2500:

(6 bulbs)
(taillamp extension harn, near fuel pump harness breakout)
5v ref
A/t
A/t 4wd
Accy
Air bag ind
Anti- lock brakes ind
Anti-lock brakes system
Bat ind
Brake ind
Brake pressure warning switch (on rear of ebcm casting)
Brake psi
Bulb test
Check gauges ind
Check gauges lamp driver
Daytime running lamps ind
Daytime running lamps module (behind left side of dash, taped to dash harness)
Electronic brake control module (on left side of engine compt)
Engine controls system (fuel pump balance relay)
Engine coolant temperature sender (left cylinder head)
Exterior lights system
Fuel
Fuel gauge
Fuel in
Fuel pump & sender (in front fuel tank)
Fuel pump & sender (in fuel tank)
Fuel pump balance module (inside left side frame rail)
Fuel pump/ oil pressure switch & sender (rear top center of engine)
Fuel tank
G119 (right front of engine block)
G131 (near thermo- stat housing)
G134 (front top of engine)
Gauges fuse 4 10a
Headlights system
Hi beam ind
Hot in run or start
Hot in run, bulb test or start
I/p fuse block (left end of dash)
Ign
Ign e mini fuse 10a
Ign sw
Ignition coil (right rear of engine)
Ignition switch
Illum
Illumination
Instrument cluster
Interior lights system
Led dimming
Left turn ind
Lock
M/t
M/t 4wd & all 2wd
Mil ind
Off
Oil gauge
Parity prndl
Park brake warning switch (on park brake pedal bracket)
Pk brake
Pnk
Prndl
Prndl a
Prndl b
Prndl c
Right turn ind
Run
S103
S146
S147
S162
S213
S215
S317
S430
Safety belt ind
Secondary fuel gage sender (in rear fuel tank)
Sens rtrn
Service engine soon ind
Single dual fuel tanks
Speedo
Speedometer
Start
Starting/charging system
Tach
Tan
Temp gauge
Trans fuse 20 10a
Transmission range selector (left side of transmission)
Twisted pair
Underhood fuse- relay center
Upshift ind
Upshift ind (m/t only)
Vehicle control module (left side of engine compt)
Vehicle speed sensor (left rear of transmission or transfer case)
Vehicle speed sensor (vss) adapter
Voltmeter
Vss
Warning systems

5.7L

5.7L (VIN R), Instrument Cluster Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 5.7L (VIN R), Instrument Cluster Wiring Diagram for GMC Cab & Chassis C1998 2500:

(6 bulbs)
(taillamp extension harn, near fuel pump harness breakout)
5v ref
A/t
A/t 4wd
Accy
Air bag ind
Anti- lock brakes ind
Anti-lock brakes system
Bat ind
Brake ind
Brake pressure warning switch (on rear of ebcm casting)
Brake psi
Bulb test
Check gauges ind
Check gauges lamp driver
Daytime running lamps ind
Daytime running lamps module (behind left side of dash, taped to dash harness)
Electronic brake control module (on left side of engine compt)
Engine controls system (fuel pump balance relay)
Engine coolant temperature sender (left cylinder head)
Exterior lights system
Fuel
Fuel gauge
Fuel in
Fuel pump & sender (in front fuel tank)
Fuel pump & sender (in fuel tank)
Fuel pump balance module (inside left side frame rail)
Fuel pump/ oil pressure switch & sender (rear top center of engine)
Fuel tank
G119 (right front of engine block)
G131 (near thermo- stat housing)
G134 (front top of engine)
Gauges fuse 4 10a
Headlights system
Hi beam ind
Hot in run or start
Hot in run, bulb test or start
I/p fuse block (left end of dash)
Ign
Ign e mini fuse 10a
Ign sw
Ignition coil (right rear of engine)
Ignition switch
Illum
Illumination
Instrument cluster
Interior lights system
Led dimming
Left turn ind
Lock
M/t
M/t 4wd & all 2wd
Mil ind
Off
Oil gauge
Parity prndl
Park brake warning switch (on park brake pedal bracket)
Pk brake
Pnk
Prndl
Prndl a
Prndl b
Prndl c
Right turn ind
Run
S103
S146
S147
S162
S213
S215
S317
S430
Safety belt ind
Secondary fuel gage sender (in rear fuel tank)
Sens rtrn
Service engine soon ind
Single dual fuel tanks
Speedo
Speedometer
Start
Starting/charging system
Tach
Tan
Temp gauge
Trans fuse 20 10a
Transmission range selector (left side of transmission)
Twisted pair
Underhood fuse- relay center
Upshift ind
Upshift ind (m/t only)
Vehicle control module (left side of engine compt)
Vehicle speed sensor (left rear of transmission or transfer case)
Vehicle speed sensor (vss) adapter
Voltmeter
Vss
Warning systems

6.5L

6.5L (VIN F), Instrument Cluster Wiring Diagram (1 of 2) for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN F), Instrument Cluster Wiring Diagram (1 of 2) for GMC Cab & Chassis C1998 2500:

(6 bulbs)
Air bag ind
Anti- lock brakes ind
Anti-lock brakes system
Bat ind
Brake ind
Check gauges ind
Check gauges lamp driver
Daytime running lamps ind
Engine controls system
Engine coolant temperature sensor (on top right front of engine, near thermostat housing)
Exterior lights system
Fuel gauge
G117 (top rear of right cylinder head)
G119 (right front of engine block)
G134 (front top of engine)
G202 (behind left side of dash)
Generator
Gnd
Headlights system
Hi beam ind
Ign
Illum
Illumination
Instrument cluster
Interior lights system
Led dimming
Left turn ind
Low coolant ind
Low coolant level indicator module (behind center of dash)
Low coolant level sensor (in coolant reservoir, right side of engine compt)
Oil press
Oil pressure switch & sender (under intake manifold, center of engine)
Parity prndl
Pnk
Prndl
Prndl a
Prndl b
Prndl c
Right turn ind
S107
S147
S215
S298
Safety belt ind
Service engine soon ind
Service throttle soon ind
Solid state
Speed- ometer
Starting/charging system
Tach
Tan
Temp gauge
Transmission range selector (left side of transmission)
Up- shift ind (m/t)
Volt- meter
Wait to start ind
Warning system
Water in fuel ind
Water-in fuel sensor (top rear of engine)

6.5L (VIN F), Instrument Cluster Wiring Diagram (2 of 2) for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN F), Instrument Cluster Wiring Diagram (2 of 2) for GMC Cab & Chassis C1998 2500:

(engine harn, s157
(i/p harn, 18 cm into cluster breakout)
(i/p harn, 5 cm into power steering control module breakout)
20 cm into ebcm breakout)
4wd a/t
4wd m/t & all 2wd
A/t
Accy
Anti-lock brakes system
Brake ind
Brake ind in
Brake pressure warning switch (on rear of ebcm casting)
Brake psi
Bulb test
C100
Daytime running lamps module (behind left side of dash, taped to panel wiring harness)
Diode 1
Dual fuel tanks
Electronic brake control module (left side of engine compt)
Eng 1 mini fuse 20a
Engine controls system
Engine controls system (fuel pump balance relay)
Fuel gage sender (in front fuel tank)
Fuel pump & sender
Fuel pump balance module (inside left side of frame rail)
G119 (right front of engine block)
G134 (front top of engine)
Gauges fuse 4 10a
Hot in run, bulb test or start
I/p fuse block (left end of dash)
Ign e mini fuse 10a
Ign sw
Ignition switch
Lock
M/t
Off
Park brake warning switch (on parking brake pedal bracket)
Pk brake
Pnk
Radio
Run
S103
S108
S147
S211
S213
S215
S221
S315
S317
Secondary fuel gage sender (in rear fuel tank)
Single fuel tank
Start
Trans fuse 20 10a
Transmission system
Twisted pair
Underhood fuse-relay center (left rear of engine compt)
Vehicle speed sensor (left rear of transmission or transfer case)
Vehicle speed sensor (vss) adapter
Vehicle speed sensor buffer (behind right side of dash)

6.5L (VIN S), Instrument Cluster Wiring Diagram (1 of 2) for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN S), Instrument Cluster Wiring Diagram (1 of 2) for GMC Cab & Chassis C1998 2500:

(6 bulbs)
Air bag ind
Anti- lock brakes ind
Anti-lock brakes system
Bat ind
Brake ind
Check gauges ind
Check gauges lamp driver
Daytime running lamps ind
Engine controls system
Engine coolant temperature sensor (on top right front of engine, near thermostat housing)
Exterior lights system
Fuel gauge
G117 (top rear of right cylinder head)
G119 (right front of engine block)
G134 (front top of engine)
G202 (behind left side of dash)
Generator
Gnd
Headlights system
Hi beam ind
Ign
Illum
Illumination
Instrument cluster
Interior lights system
Led dimming
Left turn ind
Low coolant ind
Low coolant level indicator module (behind center of dash)
Low coolant level sensor (in coolant reservoir, right side of engine compt)
Oil press
Oil pressure switch & sender (under intake manifold, center of engine)
Parity prndl
Pnk
Prndl
Prndl a
Prndl b
Prndl c
Right turn ind
S107
S147
S215
S298
Safety belt ind
Service engine soon ind
Service throttle soon ind
Solid state
Speed- ometer
Starting/charging system
Tach
Tan
Temp gauge
Transmission range selector (left side of transmission)
Up- shift ind (m/t)
Volt- meter
Wait to start ind
Warning system
Water in fuel ind
Water-in fuel sensor (top rear of engine)

6.5L (VIN S), Instrument Cluster Wiring Diagram (2 of 2) for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN S), Instrument Cluster Wiring Diagram (2 of 2) for GMC Cab & Chassis C1998 2500:

(engine harn, s157
(i/p harn, 18 cm into cluster breakout)
(i/p harn, 5 cm into power steering control module breakout)
20 cm into ebcm breakout)
4wd a/t
4wd m/t & all 2wd
A/t
Accy
Anti-lock brakes system
Brake ind
Brake ind in
Brake pressure warning switch (on rear of ebcm casting)
Brake psi
Bulb test
C100
Daytime running lamps module (behind left side of dash, taped to panel wiring harness)
Diode 1
Dual fuel tanks
Electronic brake control module (left side of engine compt)
Eng 1 mini fuse 20a
Engine controls system
Engine controls system (fuel pump balance relay)
Fuel gage sender (in front fuel tank)
Fuel pump & sender
Fuel pump balance module (inside left side of frame rail)
G119 (right front of engine block)
G134 (front top of engine)
Gauges fuse 4 10a
Hot in run, bulb test or start
I/p fuse block (left end of dash)
Ign e mini fuse 10a
Ign sw
Ignition switch
Lock
M/t
Off
Park brake warning switch (on parking brake pedal bracket)
Pk brake
Pnk
Radio
Run
S103
S108
S147
S211
S213
S215
S221
S315
S317
Secondary fuel gage sender (in rear fuel tank)
Single fuel tank
Start
Trans fuse 20 10a
Transmission system
Twisted pair
Underhood fuse-relay center (left rear of engine compt)
Vehicle speed sensor (left rear of transmission or transfer case)
Vehicle speed sensor (vss) adapter
Vehicle speed sensor buffer (behind right side of dash)

7.4L

7.4L (VIN J), Instrument Cluster Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 7.4L (VIN J), Instrument Cluster Wiring Diagram for GMC Cab & Chassis C1998 2500:

(6 bulbs)
(taillamp extension harn, near fuel pump harness breakout)
5v ref
A/t
A/t 4wd
Accy
Air bag ind
Anti- lock brakes ind
Anti-lock brakes system
Bat ind
Brake ind
Brake pressure warning switch (on rear of ebcm casting)
Brake psi
Bulb test
Check gauges ind
Check gauges lamp driver
Daytime running lamps ind
Daytime running lamps module (behind left side of dash, taped to dash harness)
Electronic brake control module (on left side of engine compt)
Engine controls system (fuel pump balance relay)
Engine coolant temperature sender (left cylinder head)
Exterior lights system
Fuel
Fuel gauge
Fuel in
Fuel pump & sender (in front fuel tank)
Fuel pump & sender (in fuel tank)
Fuel pump balance module (inside left side frame rail)
Fuel pump/ oil pressure switch & sender (rear top center of engine)
Fuel tank
G119 (right front of engine block)
G131 (near thermo- stat housing)
G134 (front top of engine)
Gauges fuse 4 10a
Headlights system
Hi beam ind
Hot in run or start
Hot in run, bulb test or start
I/p fuse block (left end of dash)
Ign
Ign e mini fuse 10a
Ign sw
Ignition coil (right rear of engine)
Ignition switch
Illum
Illumination
Instrument cluster
Interior lights system
Led dimming
Left turn ind
Lock
M/t
M/t 4wd & all 2wd
Mil ind
Off
Oil gauge
Parity prndl
Park brake warning switch (on park brake pedal bracket)
Pk brake
Pnk
Prndl
Prndl a
Prndl b
Prndl c
Right turn ind
Run
S103
S146
S147
S162
S213
S215
S317
S430
Safety belt ind
Secondary fuel gage sender (in rear fuel tank)
Sens rtrn
Service engine soon ind
Single dual fuel tanks
Speedo
Speedometer
Start
Starting/charging system
Tach
Tan
Temp gauge
Trans fuse 20 10a
Transmission range selector (left side of transmission)
Twisted pair
Underhood fuse- relay center
Upshift ind
Upshift ind (m/t only)
Vehicle control module (left side of engine compt)
Vehicle speed sensor (left rear of transmission or transfer case)
Vehicle speed sensor (vss) adapter
Voltmeter
Vss
Warning systems

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram, Regular Cab/Extended Cab for GMC Cab & Chassis C1998 2500

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List of elements for Courtesy Lamps Wiring Diagram, Regular Cab/Extended Cab for GMC Cab & Chassis C1998 2500:

(crossbody harn, approx 22 cm from left door harn breakout)
(i/p harn, approx 6 cm from i/p compt box lamp breakout) s208
(not used)
Bat
Cargo lamp
Courtesy lamps
Ctrl
Ctsy fuse 3 20a
Dome defeat
Dome lamp defeat
Door jamb
From chmsl breakout)
Front dome and reading lamp
G120 (right front of engine block)
G201 (right side of dash)
G202 (behind left side of dash)
Gages fuse 4 10a
Gnd
Headlamp and panel dimmer switch
Horn fuse 20a
Hot at all times
Hot in run, bulb test or start
I/p compartment box lamp
I/p fuse block
Ign sw
Interior lamp control module (under center of dash)
Lamp out
Left front door jamb switch
Left i/p courtesy lamp
Left illuminated vanity mirror
Mirrors system
Nca
Pnk
Pnk a
Pnk j
Remote control door lock receiver (behind center of dash)
Right front door jamb switch
Right i/p courtesy lamp
Right illuminated vanity mirror
S113
S162 (gas) s147 (diesel)
S204
S209 (i/p harn, approx 13 cm from i/p compt box lamp harn breakout)
S213
S218
S242
S244
S246
S248
S251
S312
S316
Underhood fuse-relay center
Underhood lamp
Underhood reel lamp
W/ rke
W/o rke

Instrument Illumination Wiring Diagram (1 of 2) for GMC Cab & Chassis C1998 2500

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List of elements for Instrument Illumination Wiring Diagram (1 of 2) for GMC Cab & Chassis C1998 2500:

(6) bulbs
(at right "b" pillar)
(behind left side of dash)
(cross- body harn, near i/p harn breakout) s253
(i/p harn, near i/p cluster breakout) s217
(right side of dash)
Audio alarm module (on convenience center)
Automatic transfer cash select switch
Auxiliary heater control switch (subur- ban/ utilitiy only)
Cargo lamp switch (pickup only)
Daytime running lamp (drl)/ radio override switch
Daytime running lamps (drl)/ radio override switch
Display dim sig
Fog lamp switch
Front auxiliary hvac control lamp
G131 (near thermostat housing)
G201
G202
G305
Headlamp and panel dimmer switch
Hot at all times
Hvac control lamp
I/p fuse block
Illum fuse 14 10a
Inflatable restaint i/p module enable switch
Inflatable restaint i/p module switch
Instrument cluster
Liftgate release switch (subur- ban/ utilitiy only)
Off
Parade mode sw
Park
Park lps fuse 9 20a
Pickup/ extended cab only
Radio
Rear auxiliary hvac control lamp
Rear window wiper/ washer switch (subur- ban/ utilitiy only)
Rheo- stat
S103
S204
S216 (i/p harn, near i/p cluster breakout)
S218
S259
S307
Suburban & utility only
Transfer case shift illumination lamp
Transfer case switch
Z56 only

Instrument Illumination Wiring Diagram (2 of 2) for GMC Cab & Chassis C1998 2500

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List of elements for Instrument Illumination Wiring Diagram (2 of 2) for GMC Cab & Chassis C1998 2500:

(behind left side of dash)
(crossbody harn, approx 6 cm in left door harn breakout)
(right side of dash)
Ash tray lamp
Exterior lights system
G201
G202
Headlamp and panel dimmer switch
Hot at all times
I/p fuse block
Left front power window switch
Left power rearview mirror switch
Left rear power window switch
Off
Parade mode sw
Park
Park lps fuse 9 20a
Rear window lockout switch
Rheo- stat
Right front power window switch
Right rear power window switch
S210 (i/p harn, approx 12 cm from steering column harn breakout)
S218
S244
S247
S251
S259
S500
S502 (left front door harn, near tweeter)

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 5) for GMC Cab & Chassis C1998 2500

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List of elements for Power Distribution Wiring Diagram (1 of 5) for GMC Cab & Chassis C1998 2500:

(auxiliary a/c harness, near blower motor relays) s401
(diesel)
(diesel-engine harness, 5cm from starter solenoid breakout gasoline-engine harness, near electronic brake control module breakout)
(engine harness, approx 19cm from electronic brake control module breakout) s113
(engine harness, near ebcm breakout)
(gasoline)
(i/p harness, near steering column harness breakout) s205
(stud a)
(stud b)
(vanity mirror jumper harness, approx 4 cm from inside rearview mirror)
175a
7.4l
A/c comp fuse 10a
A/c compressor clutch relay
Abs fuse 4 60a
Aux fan fuse 30a
Aux fuse 22 20a
Auxiliary cooling fan relay
Auxiliary high blower motor relay
Auxiliary low blower motor relay
Auxiliary medium blower motor relay
Blower fuse 3 50a
Brake lamp relay
C13
C205
Camp/trail fuse 30a
Cargo lamp switch
Convenience center
Ctsy fuse 3 20a
D13
Daytime running lamps relay
Diode
Drl/fog fuse 15 20a
Dual battery
Ecm-b fuse 20a
Electronic brake control module
Evo/ passlock module
Fog lamp relay
Front dome reading lamps
Front dome/ reading lamps
Fuel pump oil pressure switch and sender
Fuel pump relay
Fusible link (10 ga-rust)
Gas only
Generator (base)
Generator (uplevel)
Headlamp and panel dimmer switch
Heater and a/c control switch
High blower motor relay
Homelink transmitter
Horn fuse 20a
Horn relay
I/p compartment box lamp
I/p fuse block
Instrument cluster (police package)
Interior lamp control module
Left battery (diesel)
Left courtesy lamp
Left front door courtesy lamp
Left illuminated vanity mirror
Left rear door courtesy lamp
Lighting fuse 8 50a
Mega fuse block
Nca
Overhead console reading lamps
Pickup only
Pk lps fuse 9 20a
Police package only
Power outside rearview mirror switch
Powertrain control module (diesel)
Radio
Radio batt fuse 19 10a
Rear dome/ reading lamps
Red
Remote battery stud
Right battery
Right courtesy lamp
Right front door courtesy lamp
Right illuminated vanity mirror
Right rear door courtesy lamp
Roof clearance lamp switch
Rr defog fuse 30a
S101
S110
S242 (i/p harn, 12cm from inflatable restraint switch breakout)
S248 (crossbody harness, approx 35 cm from rear speaker breakout)
S278
S312 s312
S443
Security/strg fuse 21 20a
Seo fuse 30a
Single battery (base)
Single battery (uplevel)
Spare power source
Spotlamp (police package)
Starter motor solenoid
Stop fuse 2 30a
Suburban/ utility
To fusible link (diagram 4 of 5)
To megafuse (diagram 5 of 5)
To underhood fuse-relay center (diagram 2 of 5)
Underhood fuse- relay center
Underhood fuse-relay center
Underhood lamp
Underhood reel lamp (gas only)
Vehicle control module (gasoline)

Power Distribution Wiring Diagram (2 of 5) for GMC Cab & Chassis C1998 2500

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List of elements for Power Distribution Wiring Diagram (2 of 5) for GMC Cab & Chassis C1998 2500:

(crew cab-crossbody harness, 1cm from door lock relay breakout except crew cab-crossbody harn, near convenience center breakout)
(crossbody harness, 20 cm from convenience center breakout) s255
(front-to-rear body harn, 7cm from dome lamp breakout)
(i/p harn, 4cm from auxiliary power outlet breakout)
(i/p harness, 12cm from steering column harness breakout) s200
(i/p harness, 4cm from steering column harness breakout)
(i/p harness, approx 8 cm from steering column harness breakout)
(i/p harness, left rear of engine compartment)
(inside left front door harness, near tweeter)
(power lumbar seat jumper harness, approx 13 cm from right power seat breakout)
4cm from i/p cluster breakout) s264
A/t
Acc
Audio alarm module
Automatic
Automatic transfer case
Automatic transfer case control module
Aux/pwr fuse 7 25a
Auxiliary power connector
C210
Cig ltr fuse 13 20a
Cigar lighter
Clutch pedal position switch
Convenience center
Crank fuse 8 10a
Cross body harn, 8cm from convenience center breakout)
D14
D15
Data link connector
Door lock control module (w/ cargo doors)
Door lock relay
E nca
Electric
From underhood fuse-relay center (diagram 1 of 5)
G202 (left side of dash)
I/p fuse block
Ign a fuse 6 40a
Ign b fuse 5 50a
Ignition switch
Instrument cluster
Left front door lock switch
Left front power lumbar seat switch
Left power seat adjuster switch
Liftgate release switch
Lock
M/t
Maxi fuse 7 50a
Nca
Off
Park/neutral position switch
Pickup
Pnk
Power amplifier relay (suburban)
Power seat lumbar switch
Power wdo circuit breaker 30a
Power window master switch
Pwr-accy circuit breaker 20a
Radio
Radio fuse 17 10a
Rear door lock switch
Rear window lockout switch (4-dr)
Rear window wiper/washer switch (suburban/utility)
Red
Remote control door lock receiver
Right front door lock switch
Right front power lumbar seat switch
Right front power window switch (2 dr & utility)
Right lumbar power seat switch
Right power seat adjuster switch
Rr wiper fuse 23 25a
Run
S201
S218
S236
S237
S256
S266
S270
S299
S300
S434
S501
Start
Starter relay
Stop lamp switch
Stop/haz fuse 1 20a
Suburban only
Suburban/ utility
T case fuse 2 20a
To s206 (diagram 4 of 5)
To s207 (diagram 3 of 5)
To s285 (diagram 5 of 5)
To seats fuse (diagram 4 of 5)
Trans fuse 20 10a
Trans- mission controls
Transfer case control module
Turn/ hazard switch
Underhood fuse-relay center
W/bench seat
Windshield wiper motor module
Windshield wiper/ washer switch
Wiper fuse 11 25a

Power Distribution Wiring Diagram (3 of 5) for GMC Cab & Chassis C1998 2500

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List of elements for Power Distribution Wiring Diagram (3 of 5) for GMC Cab & Chassis C1998 2500:

(a/t)
(engine harness, 10cm from fuel injector breakout) pnk s104
(engine harness, 12cm from fuel injector breakout)
(engine harness, 20cm from ebcm breakout)
(engine harness, 30cm from ebcm breakout)
(engine harness, approx 13 cm from ignition coil breakout)
(engine harness, approx 30 cm from egr harness breakout)
(engine harness, approx 5 cm from backup lamp switch harness breakout)
(i/p harness, 12cm from steering column harness breakout) pnk
(i/p harness, 4cm from steering column harness breakout)
(in injector harness jumper)
(m/t)
(oxygen sensor jumper harness, approx 19cm into harness)
(taillamp extension harness, approx 17 cm from fuel pump balance module breakout)
4.3l
5.0l, 5.7l
6.5l
7.4l
7.4l w/ california emissions
A/c clutch relay
A/c compressor clutch relay
Air bag fuse 10 10a
Air intake recirculation relay (5.7l)
Air relay
Audio alarm module
B pnk
Backup lamp switch
C pnk
C11
C12
Camshaft position sensor
Convenience center
Crank- shaft position sensor
Daytime running lamps module
Daytime running lamps relay
Diesel
Ecm 1 mini fuse 20a
Egr boost solenoid
Egr linear pwm valve solenoid
Egr solenoid
Electrochromatic rearview mirror w/ compass
Eng-1 mini fuse 20a
Engine shutoff solenoid
Evaporative emission canister vent
Evaporative emissions canister purge solenoid valve
Evo/ passlock module
From ignition switch (diagram 2 of 5)
Fuel heater
Fuel injector
Fuel pump balance module
Fuel pump balance relay
Fuel solenoid driver
Fuel tank sender module (4.3l)
Gasoline
Gauges fuse 4 10a
Glow plug relay
Headlamp/ panel dimmer switch
Heated oxygen sensor bank 1 sensor 1
Heated oxygen sensor bank 1 sensor 2
Heated oxygen sensor bank 1 sensor 3
Heated oxygen sensor bank 2 sensor 1
I/p fuse block
Ign e mini fuse 10a
Ignition coil
Ignition control module
Inflatable restraint i/p module switch
Inflatable restraint sensing and diagnostic module
Instrument cluster
Interior lamp control module or remote control door lock receiver
Low coolant level indicator module (diesel)
M/t
Mass air flow sensor
Mass airflow sensor
Others
Park/ neutral position switch
Pnk
Pnk s104
Pnk s154
Pnk s207
Powertrain control module
S104
S108
S146
S148
S155 pnk
S161
S161 (engine harness, approx 7cm from egr breakout) pnk
S166
S190
S213 pnk
S315
Transfer case control module (selectable 4wd electric shift)
Transfer case select switch
Turn b/u fuse 16 20a
Turn signal switch
Underhood fuse-relay center
Vehicle control module
Vehicle speed sensor buffer (diesel)
Water-in- fuel sensor

Power Distribution Wiring Diagram (4 of 5) for GMC Cab & Chassis C1998 2500

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List of elements for Power Distribution Wiring Diagram (4 of 5) for GMC Cab & Chassis C1998 2500:

(auxiliary a/c harness, 17cm from blower motor relays)
(engine harness, 7cm from ebcm) breakout)
(hvac harness, approx 4 cm from recirculation door breakout)
(i/p harness, 6cm from steering column harness breakout)
(i/p harness, approx 4 cm from steering column breakout)
(i/p harness, approx 7cm from inflatable restraint switch breakout) s268
(rear hvac control harn, approx 5 cm from hvac logic module breakout) s308
4wd fuse 24 25a
A13
Automatic transfer case control module
Automatic transfer case select switch
Auxiliary battery
Auxiliary battery relay (left rear of engine compt)
Auxiliary heater and a/c control logic module
Auxiliary heater and a/c control module (front)
Auxiliary heater and a/c control module (rear)
Auxiliary high blower motor relay
Auxiliary low blower motor relay
Auxiliary medium blower motor relay
Auxiliary mode door motor
Auxiliary temperature door motor
Brake fuse 18 10a
C205
Convenience center
Cruise control module (gas only)
Cruise control switch
Cruise fuse 6 10a
Diesel
E10
Electronic brake control module
Except diesel
From ignition switch (diagram 2 of 4)
From underhood e fuse-relay center (diagram 2 of 5)
From underhood fuse-relay center (diagram 1 of 5)
Front axle actuator
Front heated seats fuse 40a
Fusible link
G100 (left front fender)
Heated mirror relay
Heater and a/c control switch
Htr-a/c fuse 12 25a
Hvac control module
I/p fuse block
Left heated seat module
Left heated seat switch
Mirrors fuse 10a
Mode door motor
Recirculation door motor
Right heated seat module
Right heated seat switch
Rr hvac fuse 5 10a
S151
S192
S206
S233
S234
S235
S238
S243
S400
Seats fuse 40a
Spare power source
Stop lamp switch
Temperature door motor
Transfer case select switch
Underhood fuse-relay center
Vehicle control module (gass only)
W/ cargo doors
W/ lift- gate
W/ rear defrost

Power Distribution Wiring Diagram (5 of 5) for GMC Cab & Chassis C1998 2500

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List of elements for Power Distribution Wiring Diagram (5 of 5) for GMC Cab & Chassis C1998 2500:

(battery harn, left side of engine compartment s167
(in auxiliary power center harness) s285
(in auxiliary power center harness) s286
(in auxiliary power center harness) s287
6j1
9l4
Auxiliary power center (center of dash)
Cicuit breaker 15a
Cicuit breaker 25a
Customer installed options
From pwr wdo circuit breaker (diagram 2 of 5)
From right battery (diagram 1 of 5)
Fuse
Fuse 150a
Fuse 60a
Fuse block
Generator (police package)
Mega fuse
Pnk
Police package
Red
Relay a
Relay b
Right battery
S168
S288
S289

POWER DOOR LOCKS

Door Lock Wiring Diagram, without Crew Cab for GMC Cab & Chassis C1998 2500

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List of elements for Door Lock Wiring Diagram, without Crew Cab for GMC Cab & Chassis C1998 2500:

(inside right door harness) s601
Convenience center (under left side of dash)
G202 (below left side of dash)
Hot at all times
I/p fuse block (lower left side of dash)
Left front door lock actuator
Left front door lock switch
Lock
Pwr accy c.b. 20a
Right front door lock actuator
Right front door lock switch
S255
S500
S600 (inside right door harness)
Solid state
Tan
Unlock

Keyless Entry Wiring Diagram, without Crew Cab for GMC Cab & Chassis C1998 2500

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List of elements for Keyless Entry Wiring Diagram, without Crew Cab for GMC Cab & Chassis C1998 2500:

(crossbody harness, near door lock relay breakout) s256
Batt (b+)
C210
Cig ltr fuse 13 20a
Convenience center (left side of dash)
Data link connector (under left side of dash)
Dome lamps
Dome lmp off
Door lock relay (under center of dash, near remote control door lock receiver)
Driver dr unlk
G201 (right side of dash)
Gauges fuse 4 10a
Ground
Horn signal
Horns system
Hot at all times
Hot in run, bulb test or start
I/p fuse block (left side of dash)
Ignition
Interior lamps system
Left door lock switch
Left front door lock actuator
Lock
Lock out
Pass drs unlk
Pnk
Program sig
Pwr accy c.b. 20a
Remote control door lock receiver (under center of dash panel)
Right door lock switch
Right front door lock actuator
S213
S251
S255
S257 (crossbody harness, near door lock relay harness breakout)
S258 (crossbody harn, under left side of dash)
S260 (cross body harness, 6cm from seat belt switch breakout)
S261 (crossbody harness, 12cm from seat belt switch breakout)
S264
Tan
Unlock
Unlock out
W/ power windows
W/o power windows

POWER MIRRORS

Photochromic Mirror Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Photochromic Mirror Wiring Diagram for GMC Cab & Chassis C1998 2500:

(behind left side of dash) g202
Ambient sensor (windshield side)
Automatic transmission
Backup lamp switch (on left side of trans- mission)
Backup lamp switch (part of park/neutral position switch) (on left side center of transmission)
Breakout) s278
C/m
C1 f
Exterior lights system
Gauges fuse 4 10a
Ground
Headlamp sensor (mirror side)
Hot in run or start
I/p fuse block (under left side of dash)
Inside automatic day-night mirror
Left outside automatic day-night mirror
Manual transmission
Mirror input
Mirrors switch
Nca
Note
Off
On indicator control
Pnk
Power distribution system
Reset to daytime high reflectivity in reverse
Right outside automatic day-night mirror
S160 (see note)
S213
S279 (crossbody harness, approx 38 cm from convenience center pnk breakout)
S316
Si60: (4.3l) (engine harness, approximately 21 cm from egr valve breakout) s160: (5.0l & 5.7l) (engine harness, approximately 23 cm from ebcm breakout) s160: (6.5l) (engine harness, approximately 17 cm from ebcm breakout) s160: (7.4l) (engine harness approximately 28 cm from fuel injector breakout)
Solid state
T/m
Temperature sensor (in engine compartment, near lower radiator support)
Turn b/u fuse 16 20a

Power Mirrors Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Power Mirrors Wiring Diagram for GMC Cab & Chassis C1998 2500:

(inside left front door harness)
(inside right front door harness)
(right side of dash) g201
Ctsy fuse 3 20a
Down
Hot at all times
I/p fuse block
Illum- nation lamp
Interior lights system
Left
Left power outside rearview mirror
Left/ right motor
Power outside rearview mirror switch
Red
Right
Right power outside rearview mirror
S248
S251
S503
S602
Up/ down motor

POWER SEATS

6-Way Power Seat Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for 6-Way Power Seat Wiring Diagram for GMC Cab & Chassis C1998 2500:

(right side of dash)
(w/ reg/extended cab) (except reg/extended cab)
Back
C210
Convenience center
Down
Entire seat
For- ward
Forward/ rearward motor
Front height
Front tilt motor
G201
Hot at all times
I/p fuse block
Left power seat adjuster switch
Pwr accy circuit breaker 20a 30a
Rear height
Rear tilt motor
Right lumbar power seat switch
Right power seat adjuster switch
S237
S255
S259
S303
Tan

Heated Seats Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Heated Seats Wiring Diagram for GMC Cab & Chassis C1998 2500:

(cross body harn, left side of dash, near convenience center)
(left heated seat harn, near heated seat control module breakout)
Batt
Convenience center
Front heated seats fuse 20a
G201 (right side of dash)
Gnd
Heated seat sw sig
High/low sig
Hot at all time
Hot in run
I/p fuse block
Indicator lmp feed
Left heated seat module (under left power seat)
Left heated seat switch
Off
Power seat circuit
Right heated seat module (under right power seat)
Right heated seat switch
Rr hvac fuse 5 10a
S228
S233
S238
S259
S273
S274
S277
S278
S303
Seat belt switch (on driver seat belt buckle)
Seat cushion element
Sig enable
Thermistor
Underhood fuse/relay center

Lumbar Wiring Diagram, Bench Seat for GMC Cab & Chassis C1998 2500

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List of elements for Lumbar Wiring Diagram, Bench Seat for GMC Cab & Chassis C1998 2500:

(right side of dash) g201
(w/ regular/extended cab) (except regular extended cab)
6-way power seat circuit
Convenience center (under left side of dash)
Hot at all times
I/p fuse block
Left power lumbar support motor
Left power seat lumbar switch
Nca
Power seat adjuster switch
Pwr-accy circuit breaker 20a 30a
Right power lumbar support motor
Right power seat lumbar switch
S227
S259
S303

Lumbar Wiring Diagram, Bucket And Split Bench with Heated Seat for GMC Cab & Chassis C1998 2500

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List of elements for Lumbar Wiring Diagram, Bucket And Split Bench with Heated Seat for GMC Cab & Chassis C1998 2500:

(right side of dash) g201
6-way power seat circuit
Cig ltr fuse 13 20a
Convenience center (under left side of dash)
Hot at all times
I/p fuse block
Left power lumbar support motor
Left power seat lumbar switch
Nca
Right power lumbar support motor
Right power seat lumbar switch
S259
S264 (suburban utility only)
S303

Lumbar Wiring Diagram, Bucket And Split Bench without Heated Seat for GMC Cab & Chassis C1998 2500

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List of elements for Lumbar Wiring Diagram, Bucket And Split Bench without Heated Seat for GMC Cab & Chassis C1998 2500:

C210 b
Cig ltr fuse 13 20a
Convenience center (under left side of dash)
G201 (right side of dash)
Hot at all times
I/p fuse block
Left power lumbar seat switch
Pnk
Power lumbar motor
Right power lumbar seat switch
S259
S264 (suburban utility only)
S310

POWER WINDOWS

Power Window Wiring Diagram, 2 Door for GMC Cab & Chassis C1998 2500

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List of elements for Power Window Wiring Diagram, 2 Door for GMC Cab & Chassis C1998 2500:

Auto window down module
Convenience center (under left side of dash)
Down
G201 (right side of dash)
Hot in run
I/p fuse block (under left side of dash)
Interior lights system
Left front
Left front window motor
Left power window master switch
Pwr window circuit breaker 30a
Right front
Right front window motor
Right front window switch
S251
S259
S266
S500
S501
Solid state
Tan

Power Window Wiring Diagram, 4 Door for GMC Cab & Chassis C1998 2500

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List of elements for Power Window Wiring Diagram, 4 Door for GMC Cab & Chassis C1998 2500:

(crossbody harn, approx 32cm from seat belt sw breakout toward i/p harn breakout)
Convenience center (under left side of dash)
Down
Fuse block (under left side of dash)
G201 (right side of dash)
Headlamp and panel dimmer switch
Hot at all times
Hot in run
Left front
Left front power window master switch
Left front window motor
Left rear
Left rear window motor
Left rear window switch
Pk lps fuse 20a
Power window circuit breaker 30a
Right front
Right front window motor
Right front window switch
Right rear
Right rear window motor
Right rear window switch
S247 (crossbody harn, approx 6cm into left door harn breakout)
S251
S259
S263
S500
S501
S502 (inside left front door harness, approx 4cm from tweeter breakout)
Solid state
Tan
Window lockout switch

RADIO

Radio Wiring Diagrams, with Amplifier for GMC Cab & Chassis C1998 2500

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List of elements for Radio Wiring Diagrams, with Amplifier for GMC Cab & Chassis C1998 2500:

(left side of dash) data link connector
(lf door harn, near window reg breakout)
(rf door harn, near door lock motor breakout)
Amp feed
Antenna
Audio rtn
Bare
Battery
Cig ltr fuse 13 20a
Diesel
Dim
Dim feed
Display dim
Drain rtn
E&c diag
Fuse out
G201 (right side of dash)
G202 (left side of dash)
Gas
Ground
Hot at all times
Hot in acc or run
I/p fuse block
Interior lights system
Left front speaker
Left front tweeter
Left rear door speaker
Left rear speaker
Lf +
Lf -
Lr +
Lr dr +
Lr dr -
Lr _
Lr+
Lr-
Lt audio
Lt remote
Nca
Pnk
Power amplifier (under left side of dash)
Power amplifier relay (under left side of dash)
Radio
Radio batt fuse 19 10a
Radio fuse 17 10a
Red
Remote audio player
Remote rtn
Rf +
Rf -
Right front speaker
Right front tweeter
Right rear door speaker
Right rear speaker
Rly sig
Rr +
Rr -
Rr dr +
Rr dr -
Rr+
Rr-
Rt audio
Rt remote
S221
S249
S250
S251
S252
S254
S256
S259
S298
S504
S505
S603
S604
Serial data
Tan
Tape ctrl
Vehicle control module (left side of engine compartment)
Vehicle speed sensor buffer (behind right side of dash)
Vss signal

Radio Wiring Diagrams, without Amplifier for GMC Cab & Chassis C1998 2500

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List of elements for Radio Wiring Diagrams, without Amplifier for GMC Cab & Chassis C1998 2500:

(left side of dash) data link connector
(lf door harn, near window reg breakout)
(rf door harn, near door lock motor breakout)
Amp feed
Antenna
Audio rtn
Bare
Battery
Diesel
Dim
Dim feed
Display dim
Drain rtn
E&c diag
Fuse out
G202 (left side of dash)
Gas
Ground
Hot at all times
Hot in acc or run
I/p fuse block
Interior lights system
Left front speaker
Left front tweeter
Left rear speaker
Lf +
Lf -
Lr +
Lr _
Lt audio
Lt remote
Nca
Pnk
Radio
Radio batt fuse 19 10a
Radio fuse 17 10a
Remote audio player
Remote rtn
Rf +
Rf -
Right front speaker
Right front tweeter
Right rear speaker
Rr +
Rr -
Rt audio
Rt remote
S221
S298
S504
S505
S603
S604
Serial data
Tan
Tape ctrl
Vehicle control module (left side of engine compartment)
Vehicle speed sensor buffer (behind right side of dash)
Vss signal

SHIFT INTERLOCKS

Shift Interlock Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Shift Interlock Wiring Diagram for GMC Cab & Chassis C1998 2500:

Automatic transmission shift lock control (btsi) solenoid (right side of steering column)
G202 (behind left side of dash)
Hot in run or start
I/p fuse block
Park/ neutral position switch (left side of transmission)
Pnk
S204
Transfer case control module (under dash on steering column support bracket)
Turn/ hazard switch
Turn/bu fuse 16 20a
W/ electric shift transfer case

STARTING/CHARGING

Charging Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Charging Wiring Diagram for GMC Cab & Chassis C1998 2500:

(7.4l) l b
(base)
(gasoline)
(gasoline-right front of engine, diesel-left front of intake manifold)
(not used)
(others)
(right front wheelhouse)
(uplevel)
175a
Charge indicator
Diesel only
Fusible link (10 ga-rust)
G101
G119 (gasoline) g110 (diesel)
Gauges fuse 4 10a
Generator
Hot in run, or start
I/p fuse block
Instrument cluster
Left battery (diesel)
Mega fuse block
Pnk
Power distribution system
Power distribution system (diesel)
Red
Right battery
S213
Starting circuit
Tach

Starting Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Starting Wiring Diagram for GMC Cab & Chassis C1998 2500:

(front of left front fender)
(gas-right front of eng., diesel-left front of intake manifold)
(right front off engine)
(right front wheelhouse)
175a
A/t
Accy
Battery stud
Bulb test
Charging circuit
Clutch pedal position switch (top of clutch pedal)
Crank fuse 8 10a
Diesel
G100
G101
G119
G119 (gasoline) g110 (diesel)
Gas
Hold- in coil
I/p fuse block
Ign a fuse 6 40a
Ignition switch
Left battery (diesel)
Lock
M/t
Mega fuse block (uplevel feature only)
Nca
Off
Pull- in coil
Red
Right battery
Run
S107
Start
Starter motor
Starter relay
Starter solenoid
Transmission range switch (left side of transmission)
Underhood fuse-relay center

SUPPLEMENTAL RESTRAINTS

Supplemental Restraint Wiring Diagram for GMC Cab & Chassis C1998 2500

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List of elements for Supplemental Restraint Wiring Diagram for GMC Cab & Chassis C1998 2500:

(under left side of dash) data link connector
Air bag fuse 10 10a
Air bag ind
Bar
Cluster
Dash fuse block (under left side of dash)
Data line
Driver high
Driver low
G202 (behind left side of dash)
Gauges fuse 4 10a
Ground
Hot in run, bulb test or start
Hot w/ headlamp switch in park or headlamp
Ignition
Illum fuse 14 10a
Indicator lamp
Inflatable restraint front end discriminating sensor (under front outside center of radiator)
Inflatable restraint i/p module switch
Inflatable restraint i/p module switch (right side of dash)
Inflatable restraint sensing and diagnostic module (under driver's seat)
Inflatable restraint steering wheel module (steering whl)
Inflatable restraint steering wheel module coil
Instrument
Interior lights (dimmer swtch)
Pass disable
Pass enable
Pass high
Pass low
Pnk
S213 (dash harn, near breakout to steering column harn)
S217 (dash harn, near breakout to radio harn)
S218 (dash harn, near breakout to inflatable restraint sw)
Seat belt sig
Sensor feed
Shorting
Shorting bar
Solid state
Tan
Warning systems (seat belt switch)

TRANSMISSION

5.0L

5.0L (VIN M), Transmission Wiring Diagram, 4L60-E for GMC Cab & Chassis C1998 2500

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List of elements for 5.0L (VIN M), Transmission Wiring Diagram, 4L60-E for GMC Cab & Chassis C1998 2500:

(2wd only)
(4wd only)
(left side of transmission-2wd) (left side of transfer case-4wd)
1-2 shift sol
1-2 shift solenoid
2-3 shift sol
2-3 shift solenoid
3-2 ctrl solenoid
3-2 downshift sol
4wd low signal in
5v reference
Automatic transmission (4l60-e)
Battery in
Brake fuse 18 10a
Brake switch input
Dash fuse block
Data class ii
Data link connector (under left side of dash)
Ecm 1 fuse 20a
Ecm b fuse 20a
Ect sens input
Electronic brake control module
Eng 1 fuse 20a
Engine coolant temp sensor (top right front of engine)
Front wheel lock
Fuel injectors, ignition control moudule & ignition coil
Fuel pump & oil press switch/ sender & fuel pump relay
G120 (top of right cylinder head)
Gauges fuse 4 10a
Hot at all times
Hot in off, run or start
Hot in run
Hot in run or start
Ignition in
Instrument cluster
Maf sensor & heated oxygen sensors
Malfunction indicator lamp
Mil control
Pcm ground
Pcs sol hi out
Pcs sol lo out
Pnk
Press ctrl solenoid
Range signal "a"
Range signal "b"
Range signal "c"
Red
S101
S103
S108
S150 (engine harn, 13 cm from bpmv break-out)
S151
S161
S213
S231 (engine harness, near map or egr break-out)
Sensor ground
Sensor return
Solenoid
Stoplamp switch (on brake pedal bracket)
Tan
Tcc
Tcc pwm
Tcc pwm sol
Tcc sol
Throttle position sensor (mounted to side of throttle body)
Tp sens input
Trans fluid temp sensor
Trans fuse 20 10a
Trans range pressure switch assembly
Trans range switches
Trans temp sig in
Transfer case & axle switches (4wd only)
Transfer case circuit
Underhood fuse/relay center
Vehicle control module (left side of engine compt)
Vehicle speed sensor
Vehicle speed sensor adaptor (4wd only)
Vss hi
Vss lo

5.7L

5.7L (VIN R), Transmission Wiring Diagram, 4L60-E for GMC Cab & Chassis C1998 2500

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List of elements for 5.7L (VIN R), Transmission Wiring Diagram, 4L60-E for GMC Cab & Chassis C1998 2500:

(2wd only)
(4wd only)
(left side of transmission-2wd) (left side of transfer case-4wd)
1-2 shift sol
1-2 shift solenoid
2-3 shift sol
2-3 shift solenoid
3-2 ctrl solenoid
3-2 downshift sol
4wd low signal in
5v reference
Automatic transmission (4l60-e)
Battery in
Brake fuse 18 10a
Brake switch input
Dash fuse block
Data class ii
Data link connector (under left side of dash)
Ecm 1 fuse 20a
Ecm b fuse 20a
Ect sens input
Electronic brake control module
Eng 1 fuse 20a
Engine coolant temp sensor (top right front of engine)
Front wheel lock
Fuel injectors, ignition control moudule & ignition coil
Fuel pump & oil press switch/ sender & fuel pump relay
G120 (top of right cylinder head)
Gauges fuse 4 10a
Hot at all times
Hot in off, run or start
Hot in run
Hot in run or start
Ignition in
Instrument cluster
Maf sensor & heated oxygen sensors
Malfunction indicator lamp
Mil control
Pcm ground
Pcs sol hi out
Pcs sol lo out
Pnk
Press ctrl solenoid
Range signal "a"
Range signal "b"
Range signal "c"
Red
S101
S103
S108
S150 (engine harn, 13 cm from bpmv break-out)
S151
S161
S213
S231 (engine harness, near map or egr break-out)
Sensor ground
Sensor return
Solenoid
Stoplamp switch (on brake pedal bracket)
Tan
Tcc
Tcc pwm
Tcc pwm sol
Tcc sol
Throttle position sensor (mounted to side of throttle body)
Tp sens input
Trans fluid temp sensor
Trans fuse 20 10a
Trans range pressure switch assembly
Trans range switches
Trans temp sig in
Transfer case & axle switches (4wd only)
Transfer case circuit
Underhood fuse/relay center
Vehicle control module (left side of engine compt)
Vehicle speed sensor
Vehicle speed sensor adaptor (4wd only)
Vss hi
Vss lo

5.7L (VIN R), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 2500

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List of elements for 5.7L (VIN R), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 2500:

(2wd only)
(4wd only)
(5.7l) (7.4l)
(engine harn, 13 cm from bpmv break-out)
(left rear side of transmission-2wd) (left side of transfer case-4wd)
1-2 shift sol
1-2 shift solenoid
2-3 shift sol
2-3 shift solenoid
4wd low signal in
5v reference
A/t iss hi in
A/t iss lo in
Automatic transmission (4l80-e)
Automatic transmission input shaft speed sensor (on transmission)
Battery in
Brake fuse 18 10a
Brake switch assembly (on brake pedal bracket)
Brake switch input
Data class ii
Data link connector (under left side of dash)
Ecm 1 fuse 20a
Ecm b fuse 20a
Ect sens input
Electronic brake control module
Eng 1 fuse 20a
Engine coolant temp sensor (top right front of engine)
Front wheel lock
Fuel injectors, ignition control moudule & ignition coil
Fuel pump & oil press switch/ sender & fuel pump relay
G120 (top of right cylinder head)
Gauges fuse 4 10a
Headlamp & panel dimmer switch
Hot at all times
Hot in run
Hot in run or start
Hot in run, bulb test or start
I/p fuse block
Ignition in
Instrument cluster
Maf sensor & heated oxygen sensors
Malfunction indicator lamp
Mil control
Pcm ground
Pcs sol hi out
Pcs sol lo out
Pnk
Press ctrl
Range signal "a"
Range signal "b"
Range signal "c"
Red
S101
S103
S108
S150
S151
S161 s104
S213
S231 (engine harness, near map or egr breakout)
Sensor ground
Sensor return
Solenoid
Tan
Tcc pwm
Tcc pwm sol
Throttle position sensor (mounted to side of throttle body)
Tp sens input
Trans fluid temp sensor
Trans fuse 20 10a
Trans range pressure switch assembly
Trans range switches
Trans temp sig in
Transfer case & axle switches
Underhood fuse/relay center
Vehicle control module (vcm) (left side of engine compt)
Vehicle speed sensor
Vehicle speed sensor adaptor (4wd only)
Vss hi
Vss lo

6.5L

6.5L (VIN F), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 2500

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List of elements for 6.5L (VIN F), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 2500:

(2wd only)
(4wd only)
(i/p harn, 4 cm from engine harn break-out)
1-2 shift sol
1-2 shift solenoid
2-3 shift sol
2-3 shift solenoid
4wd low signal in
A/t iss sens hi in
A/t iss sens in
A/t iss sens lo in
A/t iss sensor out
A12
Accelerator pedal position module (part of accelerator pedal)
App 1 5v ref
App 1 signal in
App 2 5v ref
App 2 signal in
App 3 5v ref
App 3 signal in
Automatic transmission
Automatic transmission input shaft speed sensor (left front of transmission)
B10
B12
Battery in
Brake fuse 18 10a
Brake switch assembly (on brake pedal bracket)
Brake switch in
C11
C12
C13
C14
C15
Class ii data
D11
D12
D13
Data link connector (under left side of dash)
Ecm 1 fuse 20a
Ecm b fuse 20a
Ect sensor in
Engine coolant temp sensor (near thermostat housing)
Front wheel lock
Fuel pump & oil press switch/ sender & fuel pump relay
G120 (right top of cylinder head)
Gauges fuse 4 10a
Ground
Hot at all times
Hot in run
Hot in run or start
Hot in run, bulb test or start
I/p fuse block
Ignition in
Instrument cluster
Malfunction indicator lamp
Mil control
Pcm ground
Pcs sol hi out
Pcs sol lo out
Pnk
Power
Powertrain control module (right side of dash near blower motor)
Press ctrl
Red
S101
S103
S140 (engine sensor harness)
S150 (engine harness, 13 cm from bpmv harness break-out)
S152 (engine harn, 4 cm from i/p break-out)
S211
S213
S220 (i/p harn, 12 cm from brake switch connector)
S299
Sensor ground
Solenoid
Stop/haz fuse 1 20a
Stoplamp switch in
Tan
Tcc pwm
Tcc pwm sol
Tft sensor in
Trans fluid temp sensor
Trans fuse 20 10a
Trans range "a"
Trans range "b"
Trans range "c"
Trans range pressure switch assembly
Trans range switches
Transfer case & axle switches
Transfer case circuit
Turn/ hazard switch & chime module
Underhood fuse/relay center
Vehicle speed sensor (on transmission-2wd) (on transfer case-4wd)
Vehicle speed sensor (vss) adaptor (4wd only)
Vehicle speed sensor buffer (right side of dash)
Vss hi in
Vss in
Vss lo in
Vss out

6.5L (VIN S), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for 6.5L (VIN S), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 2500:

(2wd only)
(4wd only)
(i/p harn, 4 cm from engine harn break-out)
1-2 shift sol
1-2 shift solenoid
2-3 shift sol
2-3 shift solenoid
4wd low signal in
A/t iss sens hi in
A/t iss sens in
A/t iss sens lo in
A/t iss sensor out
A12
Accelerator pedal position module (part of accelerator pedal)
App 1 5v ref
App 1 signal in
App 2 5v ref
App 2 signal in
App 3 5v ref
App 3 signal in
Automatic transmission
Automatic transmission input shaft speed sensor (left front of transmission)
B10
B12
Battery in
Brake fuse 18 10a
Brake switch assembly (on brake pedal bracket)
Brake switch in
C11
C12
C13
C14
C15
Class ii data
D11
D12
D13
Data link connector (under left side of dash)
Ecm 1 fuse 20a
Ecm b fuse 20a
Ect sensor in
Engine coolant temp sensor (near thermostat housing)
Front wheel lock
Fuel pump & oil press switch/ sender & fuel pump relay
G120 (right top of cylinder head)
Gauges fuse 4 10a
Ground
Hot at all times
Hot in run
Hot in run or start
Hot in run, bulb test or start
I/p fuse block
Ignition in
Instrument cluster
Malfunction indicator lamp
Mil control
Pcm ground
Pcs sol hi out
Pcs sol lo out
Pnk
Power
Powertrain control module (right side of dash near blower motor)
Press ctrl
Red
S101
S103
S140 (engine sensor harness)
S150 (engine harness, 13 cm from bpmv harness break-out)
S152 (engine harn, 4 cm from i/p break-out)
S211
S213
S220 (i/p harn, 12 cm from brake switch connector)
S299
Sensor ground
Solenoid
Stop/haz fuse 1 20a
Stoplamp switch in
Tan
Tcc pwm
Tcc pwm sol
Tft sensor in
Trans fluid temp sensor
Trans fuse 20 10a
Trans range "a"
Trans range "b"
Trans range "c"
Trans range pressure switch assembly
Trans range switches
Transfer case & axle switches
Transfer case circuit
Turn/ hazard switch & chime module
Underhood fuse/relay center
Vehicle speed sensor (on transmission-2wd) (on transfer case-4wd)
Vehicle speed sensor (vss) adaptor (4wd only)
Vehicle speed sensor buffer (right side of dash)
Vss hi in
Vss in
Vss lo in
Vss out

7.4L

7.4L (VIN J), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 2500

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List of elements for 7.4L (VIN J), Transmission Wiring Diagram, 4L80-E for GMC Cab & Chassis C1998 2500:

(2wd only)
(4wd only)
(5.7l) (7.4l)
(engine harn, 13 cm from bpmv break-out)
(left rear side of transmission-2wd) (left side of transfer case-4wd)
1-2 shift sol
1-2 shift solenoid
2-3 shift sol
2-3 shift solenoid
4wd low signal in
5v reference
A/t iss hi in
A/t iss lo in
Automatic transmission (4l80-e)
Automatic transmission input shaft speed sensor (on transmission)
Battery in
Brake fuse 18 10a
Brake switch assembly (on brake pedal bracket)
Brake switch input
Data class ii
Data link connector (under left side of dash)
Ecm 1 fuse 20a
Ecm b fuse 20a
Ect sens input
Electronic brake control module
Eng 1 fuse 20a
Engine coolant temp sensor (top right front of engine)
Front wheel lock
Fuel injectors, ignition control moudule & ignition coil
Fuel pump & oil press switch/ sender & fuel pump relay
G120 (top of right cylinder head)
Gauges fuse 4 10a
Headlamp & panel dimmer switch
Hot at all times
Hot in run
Hot in run or start
Hot in run, bulb test or start
I/p fuse block
Ignition in
Instrument cluster
Maf sensor & heated oxygen sensors
Malfunction indicator lamp
Mil control
Pcm ground
Pcs sol hi out
Pcs sol lo out
Pnk
Press ctrl
Range signal "a"
Range signal "b"
Range signal "c"
Red
S101
S103
S108
S150
S151
S161 s104
S213
S231 (engine harness, near map or egr breakout)
Sensor ground
Sensor return
Solenoid
Tan
Tcc pwm
Tcc pwm sol
Throttle position sensor (mounted to side of throttle body)
Tp sens input
Trans fluid temp sensor
Trans fuse 20 10a
Trans range pressure switch assembly
Trans range switches
Trans temp sig in
Transfer case & axle switches
Underhood fuse/relay center
Vehicle control module (vcm) (left side of engine compt)
Vehicle speed sensor
Vehicle speed sensor adaptor (4wd only)
Vss hi
Vss lo

WARNING SYSTEMS

Warning System Wiring Diagrams for GMC Cab & Chassis C1998 2500

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List of elements for Warning System Wiring Diagrams for GMC Cab & Chassis C1998 2500:

(behind left side of dash)
(near thermostat housing)
(opens with belt buckled)
Audio alarm module (on convenience center)
Diesel
Fasten belts out
G131
G134 (front top of engine)
G201 (right side of dash)
G202
Gas
Gauges fuse 4 10a
Ground
Hot at all times
Hot in park or headlight
Hot in run, bulb test or start
I/p fuse block (under left side of dash)
Ignition on input
Illum fuse 14 10a
Instru- ment cluster
Key-in warning
Key-in warning buzzer switch (left side of steering column)
Left door jamb switch
Lights on input
Pnk
Power input
S103
S204
S213
S215
S217
S259
S298
S299
Safety belts indicator
Seat belt input
Seat belt switch (in driver's safety belt buckle)
Stop/haz fuse 1 20a
Tan

WIPER/WASHER

Front Wiper/Washer Wiring Diagram for GMC Cab & Chassis C1998 2500

Obtenha acesso a todos os diagramas de fiação do carro

List of elements for Front Wiper/Washer Wiring Diagram for GMC Cab & Chassis C1998 2500:

Front windshield washer pump motor
G108 (left radiator support)
G202 (behind left side of dash)
Hot in accy or run
I/p fuse block (under left side of dash)
Inst wipe
Low
Mist
Nca
Off
Pulse
Red
S158
S204
Solid state
Wash
Washer switch
Windshield wiper motor module (on firewall, behind wiper motor)
Windshield wiper/ washer switch
Wiper fuse 11 25a
Wiper switch