All Wiring Diagrams for GMC Pickup C1997 3500 model

AIR CONDITIONING

4.3L

4.3L (VIN W), A/C Wiring Diagram for GMC Pickup C1997 3500

List of elements for 4.3L (VIN W), A/C Wiring Diagram for GMC Pickup C1997 3500:

• (engine harn, near egr breakout)
• (engine harness, in fuse-relay center breakout)
• (engine harness, near fuse-relay center)
• (engine harness, near underhood lamp breakout)
• (exc 4.3 l)
• (fwd lamps harn, 5cm from right headlamp breakout)
• (hvac harness, 15cm from recirc door breakout)
• (i/p harn, 28 cm from cluster breakout)
• (i/p harness, in hvac connector breakout)
• (rear hvac control harness, 5 cm from hvac logic module breakout)
• (right side of engine)
• A/c comp mini fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse/relay center)
• A/c compressor cycling switch (on top right of a/c accumulator)
• A/c ctrl
• A/c disable
• A/c high pressure cutout switch (on bottom rear of a/c compressor)
• A/c low pressure cutout switch (on top rear of a/c compressor)
• A/c maxi fuse 3 50a
• A/c req
• A/c switch
• Air temp dr sensor
• Aux fan ctrl
• Aux fan mini fuse 30a
• Auxiliary cooling fan motor
• Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center)
• Battery
• Blower motor
• Blower resistor (under right side of i/p, on heater housing)
• Blower switch
• Center
• Defogger element
• Diode
• Fan req
• Front mode door motor (under i/p on heater- a/c case)
• Front temperature door motor (under i/p on heater- a/c case)
• Fuse block
• G101 (right front of engine compartment)
• G119 (right front of engine)
• G120
• G120 (right side of engine)
• G202 (behind left side of i/p)
• Ground
• Heater and a/c control module
• High blower relay (under i/p 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 mini fuse 10a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Pnk
• Rear defogger system
• Recirculation door motor (under i/p on heater- a/c case)
• Red
• Relay ctrl
• S110
• S128
• S146
• S147
• S147 (engine harn, near egr breakout)
• S180
• S185
• S186
• S244
• S268
• S298
• S308
• Tan
• Underhood fuse-relay
• Underhood fuse-relay center
• Valve ctrl
• Vehicle control module (left rear of engine compt)
• Water valve (suburban, utility, crew cab only) (right center of intake area)

Heater Wiring Diagram for GMC Pickup C1997 3500

List of elements for Heater Wiring Diagram for GMC Pickup C1997 3500:

• (engine harness)
• (hvac harness, 15cm from recirc door breakout)
• (i/p harn, 24 cm from i/p cluster breakout)
• (right side of engine)
• A/c maxi fuse 3 50a
• Air temp dr sensor
• Battery
• Blower motor
• Blower resistor (under right side of i/p, on heater housing)
• Blower switch
• C10
• Defogger element
• Front mode door motor (under i/p on heater- a/c case)
• Front temperature door motor (under i/p on heater- a/c case)
• Fuse block
• G120
• G202 (behind left side of i/p)
• Ground
• Heater and a/c control module
• High blower relay (under i/p on top of heater-a/c case)
• Hot at all times
• Hot in run
• Htr a/c fuse 12 25a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Rear defogger system
• Recirc ctrl
• Recirculation door motor (under i/p on heater- a/c case)
• Red
• S110 (engine harness, near fuse-relay center)
• S147
• S243 (hvac harness, 4 cm from recirc door breakout)
• S244
• S268 (i/p harness, 6.5 cm from hvac connector breakout)
• S298
• Tan
• Underhood fuse-relay center

5.0L

5.0L (VIN M), A/C Wiring Diagram for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), A/C Wiring Diagram for GMC Pickup C1997 3500:

• (engine harn, near egr breakout)
• (engine harness, in fuse-relay center breakout)
• (engine harness, near fuse-relay center)
• (engine harness, near underhood lamp breakout)
• (exc 4.3 l)
• (fwd lamps harn, 5cm from right headlamp breakout)
• (hvac harness, 15cm from recirc door breakout)
• (i/p harn, 28 cm from cluster breakout)
• (i/p harness, in hvac connector breakout)
• (rear hvac control harness, 5 cm from hvac logic module breakout)
• (right side of engine)
• A/c comp mini fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse/relay center)
• A/c compressor cycling switch (on top right of a/c accumulator)
• A/c ctrl
• A/c disable
• A/c high pressure cutout switch (on bottom rear of a/c compressor)
• A/c low pressure cutout switch (on top rear of a/c compressor)
• A/c maxi fuse 3 50a
• A/c req
• A/c switch
• Air temp dr sensor
• Aux fan ctrl
• Aux fan mini fuse 30a
• Auxiliary cooling fan motor
• Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center)
• Battery
• Blower motor
• Blower resistor (under right side of i/p, on heater housing)
• Blower switch
• Center
• Defogger element
• Diode
• Fan req
• Front mode door motor (under i/p on heater- a/c case)
• Front temperature door motor (under i/p on heater- a/c case)
• Fuse block
• G101 (right front of engine compartment)
• G119 (right front of engine)
• G120
• G120 (right side of engine)
• G202 (behind left side of i/p)
• Ground
• Heater and a/c control module
• High blower relay (under i/p 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 mini fuse 10a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Pnk
• Rear defogger system
• Recirculation door motor (under i/p on heater- a/c case)
• Red
• Relay ctrl
• S110
• S128
• S146
• S147
• S147 (engine harn, near egr breakout)
• S180
• S185
• S186
• S244
• S268
• S298
• S308
• Tan
• Underhood fuse-relay
• Underhood fuse-relay center
• Valve ctrl
• Vehicle control module (left rear of engine compt)
• Water valve (suburban, utility, crew cab only) (right center of intake area)

Heater Wiring Diagram for GMC Pickup C1997 3500

List of elements for Heater Wiring Diagram for GMC Pickup C1997 3500:

• (engine harness)
• (hvac harness, 15cm from recirc door breakout)
• (i/p harn, 24 cm from i/p cluster breakout)
• (right side of engine)
• A/c maxi fuse 3 50a
• Air temp dr sensor
• Battery
• Blower motor
• Blower resistor (under right side of i/p, on heater housing)
• Blower switch
• C10
• Defogger element
• Front mode door motor (under i/p on heater- a/c case)
• Front temperature door motor (under i/p on heater- a/c case)
• Fuse block
• G120
• G202 (behind left side of i/p)
• Ground
• Heater and a/c control module
• High blower relay (under i/p on top of heater-a/c case)
• Hot at all times
• Hot in run
• Htr a/c fuse 12 25a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Rear defogger system
• Recirc ctrl
• Recirculation door motor (under i/p on heater- a/c case)
• Red
• S110 (engine harness, near fuse-relay center)
• S147
• S243 (hvac harness, 4 cm from recirc door breakout)
• S244
• S268 (i/p harness, 6.5 cm from hvac connector breakout)
• S298
• Tan
• Underhood fuse-relay center

5.7L

5.7L (VIN R), A/C Wiring Diagram for GMC Pickup C1997 3500

List of elements for 5.7L (VIN R), A/C Wiring Diagram for GMC Pickup C1997 3500:

• (engine harn, near egr breakout)
• (engine harness, in fuse-relay center breakout)
• (engine harness, near fuse-relay center)
• (engine harness, near underhood lamp breakout)
• (exc 4.3 l)
• (fwd lamps harn, 5cm from right headlamp breakout)
• (hvac harness, 15cm from recirc door breakout)
• (i/p harn, 28 cm from cluster breakout)
• (i/p harness, in hvac connector breakout)
• (rear hvac control harness, 5 cm from hvac logic module breakout)
• (right side of engine)
• A/c comp mini fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse/relay center)
• A/c compressor cycling switch (on top right of a/c accumulator)
• A/c ctrl
• A/c disable
• A/c high pressure cutout switch (on bottom rear of a/c compressor)
• A/c low pressure cutout switch (on top rear of a/c compressor)
• A/c maxi fuse 3 50a
• A/c req
• A/c switch
• Air temp dr sensor
• Aux fan ctrl
• Aux fan mini fuse 30a
• Auxiliary cooling fan motor
• Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center)
• Battery
• Blower motor
• Blower resistor (under right side of i/p, on heater housing)
• Blower switch
• Center
• Defogger element
• Diode
• Fan req
• Front mode door motor (under i/p on heater- a/c case)
• Front temperature door motor (under i/p on heater- a/c case)
• Fuse block
• G101 (right front of engine compartment)
• G119 (right front of engine)
• G120
• G120 (right side of engine)
• G202 (behind left side of i/p)
• Ground
• Heater and a/c control module
• High blower relay (under i/p 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 mini fuse 10a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Pnk
• Rear defogger system
• Recirculation door motor (under i/p on heater- a/c case)
• Red
• Relay ctrl
• S110
• S128
• S146
• S147
• S147 (engine harn, near egr breakout)
• S180
• S185
• S186
• S244
• S268
• S298
• S308
• Tan
• Underhood fuse-relay
• Underhood fuse-relay center
• Valve ctrl
• Vehicle control module (left rear of engine compt)
• Water valve (suburban, utility, crew cab only) (right center of intake area)

Heater Wiring Diagram for GMC Pickup C1997 3500

List of elements for Heater Wiring Diagram for GMC Pickup C1997 3500:

• (engine harness)
• (hvac harness, 15cm from recirc door breakout)
• (i/p harn, 24 cm from i/p cluster breakout)
• (right side of engine)
• A/c maxi fuse 3 50a
• Air temp dr sensor
• Battery
• Blower motor
• Blower resistor (under right side of i/p, on heater housing)
• Blower switch
• C10
• Defogger element
• Front mode door motor (under i/p on heater- a/c case)
• Front temperature door motor (under i/p on heater- a/c case)
• Fuse block
• G120
• G202 (behind left side of i/p)
• Ground
• Heater and a/c control module
• High blower relay (under i/p on top of heater-a/c case)
• Hot at all times
• Hot in run
• Htr a/c fuse 12 25a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Rear defogger system
• Recirc ctrl
• Recirculation door motor (under i/p on heater- a/c case)
• Red
• S110 (engine harness, near fuse-relay center)
• S147
• S243 (hvac harness, 4 cm from recirc door breakout)
• S244
• S268 (i/p harness, 6.5 cm from hvac connector breakout)
• S298
• Tan
• Underhood fuse-relay center

6.5L

6.5L (VIN S), A/C Wiring Diagram for GMC Pickup C1997 3500

List of elements for 6.5L (VIN S), A/C Wiring Diagram for GMC Pickup C1997 3500:

• (engine harn, 30cm from breakout to ebcm)
• (engine harn, near egr breakout)
• (engine harness, in fuse-relay center breakout)
• (engine harness, near fuse-relay center)
• (hvac harness, 15cm from recirc door breakout)
• (i/p harn, 28 cm from cluster breakout)
• (i/p harn, 8 cm from radio harness breakout)
• (i/p harness, in hvac connector breakout)
• (rear hvac control harness, 5 cm from hvac logic module breakout)
• (right side of engine)
• A/c comp mini 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 near compressor)
• A/c ctrl
• A/c disable
• A/c high pressure cutout switch (on a/c compressor)
• A/c low pressure cutout switch (on low pressure line)
• A/c maxi fuse 3 50a
• A/c req
• A/c switch
• Air temp dr sensor
• Aux fan ctrl
• Battery
• Blower motor
• Blower resistor (under right side of i/p, on heater housing)
• Blower switch
• Center
• Defogger element
• Diode
• Front mode door motor (under i/p on heater- a/c case)
• Front temperature door motor (under i/p on heater- a/c case)
• Fuse block
• G120
• G120 (right side of engine)
• G202 (behind left side of i/p)
• Ground
• Heater and a/c control module
• High blower relay (under i/p 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 mini 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 i/p on heater- a/c case)
• Red
• S107
• S110
• S146
• S147
• S147 (engine harn, near egr breakout)
• S185
• S186
• S212
• S244
• S268
• S298
• S308
• Tan
• Underhood fuse-relay
• Valve ctrl
• Water valve (suburban, utility, crew cab only) (right center of intake area)

Heater Wiring Diagram for GMC Pickup C1997 3500

List of elements for Heater Wiring Diagram for GMC Pickup C1997 3500:

• (engine harness)
• (hvac harness, 15cm from recirc door breakout)
• (i/p harn, 24 cm from i/p cluster breakout)
• (right side of engine)
• A/c maxi fuse 3 50a
• Air temp dr sensor
• Battery
• Blower motor
• Blower resistor (under right side of i/p, on heater housing)
• Blower switch
• C10
• Defogger element
• Front mode door motor (under i/p on heater- a/c case)
• Front temperature door motor (under i/p on heater- a/c case)
• Fuse block
• G120
• G202 (behind left side of i/p)
• Ground
• Heater and a/c control module
• High blower relay (under i/p on top of heater-a/c case)
• Hot at all times
• Hot in run
• Htr a/c fuse 12 25a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Rear defogger system
• Recirc ctrl
• Recirculation door motor (under i/p on heater- a/c case)
• Red
• S110 (engine harness, near fuse-relay center)
• S147
• S243 (hvac harness, 4 cm from recirc door breakout)
• S244
• S268 (i/p harness, 6.5 cm from hvac connector breakout)
• S298
• Tan
• Underhood fuse-relay center

ANTI-LOCK BRAKES

4.3L

4.3L (VIN W), Anti-lock Brake Wiring Diagrams for GMC Pickup C1997 3500

List of elements for 4.3L (VIN W), Anti-lock Brake Wiring Diagrams for GMC Pickup C1997 3500:

• (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 i/p) data link connector
• (right lower front of engine)
• 4wd sw input
• 4wd telltale feed
• Abs ind
• Abs lamp control
• Abs maxi fuse 4 60a
• Brake fuse 18 10a
• Brake ind
• Brake lamp control
• Brake pressure warning switch
• Brake sw input
• Brake sw output
• Daytime running lamps module (left side of i/p)
• Diode 1 (underhood fuse/relay center)
• Ebcm ground
• Electronic brake control module (left front wheelhouse)
• G119
• Gauges fuse 4 10a
• Hot at all times
• Hot in run
• Hot in run, bulb test or start
• I/p fuse block
• Ign
• Instrument cluster
• Left front wheel speed sensor
• Lft frt sensor (+)
• Lft frt sensor (-)
• Nca
• Pnk
• Pump motor ground
• Pump motor power
• Red
• Right front wheel speed sensor
• Rt frt sensor (+)
• Rt frt sensor (-)
• S107
• S111
• S147
• S150
• S151
• S152
• S157
• S213
• Serial data line
• Tan
• Tcc/ stoplamp switch (top of brake pedal)
• Underhood fuse-relay center
• Vehicle control module (left front wheelhouse)
• Vehicle speed sensor (left side of transmission/ transfer case)
• Vehicle speed sig
• Vss (+)
• Vss (-)
• Vss sig

5.0L

5.0L (VIN M), Anti-lock Brake Wiring Diagrams for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), Anti-lock Brake Wiring Diagrams for GMC Pickup C1997 3500:

• (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 i/p) data link connector
• (right lower front of engine)
• 4wd sw input
• 4wd telltale feed
• Abs ind
• Abs lamp control
• Abs maxi fuse 4 60a
• Brake fuse 18 10a
• Brake ind
• Brake lamp control
• Brake pressure warning switch
• Brake sw input
• Brake sw output
• Daytime running lamps module (left side of i/p)
• Diode 1 (underhood fuse/relay center)
• Ebcm ground
• Electronic brake control module (left front wheelhouse)
• G119
• Gauges fuse 4 10a
• Hot at all times
• Hot in run
• Hot in run, bulb test or start
• I/p fuse block
• Ign
• Instrument cluster
• Left front wheel speed sensor
• Lft frt sensor (+)
• Lft frt sensor (-)
• Nca
• Pnk
• Pump motor ground
• Pump motor power
• Red
• Right front wheel speed sensor
• Rt frt sensor (+)
• Rt frt sensor (-)
• S107
• S111
• S147
• S150
• S151
• S152
• S157
• S213
• Serial data line
• Tan
• Tcc/ stoplamp switch (top of brake pedal)
• Underhood fuse-relay center
• Vehicle control module (left front wheelhouse)
• 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 Pickup C1997 3500

List of elements for 5.7L (VIN R), Anti-lock Brake Wiring Diagrams for GMC Pickup C1997 3500:

• (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 i/p) data link connector
• (right lower front of engine)
• 4wd sw input
• 4wd telltale feed
• Abs ind
• Abs lamp control
• Abs maxi fuse 4 60a
• Brake fuse 18 10a
• Brake ind
• Brake lamp control
• Brake pressure warning switch
• Brake sw input
• Brake sw output
• Daytime running lamps module (left side of i/p)
• Diode 1 (underhood fuse/relay center)
• Ebcm ground
• Electronic brake control module (left front wheelhouse)
• G119
• Gauges fuse 4 10a
• Hot at all times
• Hot in run
• Hot in run, bulb test or start
• I/p fuse block
• Ign
• Instrument cluster
• Left front wheel speed sensor
• Lft frt sensor (+)
• Lft frt sensor (-)
• Nca
• Pnk
• Pump motor ground
• Pump motor power
• Red
• Right front wheel speed sensor
• Rt frt sensor (+)
• Rt frt sensor (-)
• S107
• S111
• S147
• S150
• S151
• S152
• S157
• S213
• Serial data line
• Tan
• Tcc/ stoplamp switch (top of brake pedal)
• Underhood fuse-relay center
• Vehicle control module (left front wheelhouse)
• Vehicle speed sensor (left side of transmission/ transfer case)
• Vehicle speed sig
• Vss (+)
• Vss (-)
• Vss sig

6.5L

6.5L (VIN S), Anti-lock Brake Wiring Diagrams for GMC Pickup C1997 3500

List of elements for 6.5L (VIN S), Anti-lock Brake Wiring Diagrams for GMC Pickup C1997 3500:

• (engine harn, 4 cm from i/p breakout)
• (engine harness, 13 cm in ebcm breakout)
• (left side of i/p) data link connector
• (top right rear of engine)
• 4wd input c2
• 4wd sw input
• A/t only
• Abs ind
• Abs lamp control
• Abs maxi fuse 4 60a
• Brake fuse 18 10a
• Brake ind
• Brake lamp control
• Brake pressure warning switch
• Brake sw input
• Daytime running lamps module (below left side of i/p)
• Diode 1 (underhood fuse/relay center)
• Ebcm ground
• Electronic brake control module (left front side of frame)
• G117
• 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 (-)
• Nca
• Pnk
• Powertrain control module (right side of i/p)
• 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 (near steering column)
• Vss sig
• Vss sig out

COMPUTER DATA LINES

Computer Data Lines for GMC Pickup C1997 3500

List of elements for Computer Data Lines for GMC Pickup C1997 3500:

• (behind left side of i/p)
• (gasoline) g134 (diesel) g120
• (gasoline-front top of engine, diesel-right top of cylinder head)
• 13 cm into ebcm breakout)
• Aux pwr fuse 7 25a
• Data clss
• Data clss 2
• Data link connector (left side of i/p)
• Diesel
• Dlc control
• Electronic brake control module (left front wheelhouse)
• G202
• Gasoline
• Hot at all times
• I/p fuse block
• Inflatable restraint sensing and diagnostic module (under driver's seat carpet)
• Power steering control module (center of i/p)
• Powertrain control module (right side of i/p)
• Prog enable
• Radio
• Remote control door lock receiver (behind center of i/p)
• S204
• S215
• S272
• S280 (i/p harness, approx 5 cm into dlc breakout)
• Serial data
• Tan
• Transfer case control module (steering column support bracket)
• Uart data
• Vehicle control module (engine compt, near ebcm)

COOLING FAN

5.0L

5.0L (VIN M), Cooling Fan Wiring Diagram for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), Cooling Fan Wiring Diagram for GMC Pickup C1997 3500:

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

5.7L

5.7L (VIN R), Cooling Fan Wiring Diagram for GMC Pickup C1997 3500

List of elements for 5.7L (VIN R), Cooling Fan Wiring Diagram for GMC Pickup C1997 3500:

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

CRUISE CONTROL

4.3L

4.3L (VIN W), Cruise Control Wiring Diagram for GMC Pickup C1997 3500

List of elements for 4.3L (VIN W), Cruise Control Wiring Diagram for GMC Pickup C1997 3500:

• (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 (front of engine compt near left fender)
• 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
• Tcc/stoplamp brake switch (top of brake pedal)
• Vehicle control module (vcm) (in engine compt, on left fender)
• Vehicle speed input
• Vehicle speed sensor (vss) (left side of transmission)
• Vss return
• Vss signal

5.0L

5.0L (VIN M), Cruise Control Wiring Diagram for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), Cruise Control Wiring Diagram for GMC Pickup C1997 3500:

• (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 (front of engine compt near left fender)
• 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
• Tcc/stoplamp brake switch (top of brake pedal)
• Vehicle control module (vcm) (in engine compt, on left fender)
• 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 Pickup C1997 3500

List of elements for 5.7L (VIN R), Cruise Control Wiring Diagram for GMC Pickup C1997 3500:

• (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 (front of engine compt near left fender)
• 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
• Tcc/stoplamp brake switch (top of brake pedal)
• Vehicle control module (vcm) (in engine compt, on left fender)
• Vehicle speed input
• Vehicle speed sensor (vss) (left side of transmission)
• Vss return
• Vss signal

6.5L

6.5L (VIN S), Cruise Control Wiring Diagram for GMC Pickup C1997 3500

List of elements for 6.5L (VIN S), Cruise Control Wiring Diagram for GMC Pickup C1997 3500:

• (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
• A12
• A13
• A14
• A15
• Brake fuse 18 10a
• Clutch pedal switch (top of clutch pedal)
• Cruise fuse 6 10a
• Cruise on input
• D11
• D15
• Disengage input
• Fuse block
• Hot at all times
• Hot in run
• M/t
• Multifunction lever
• Off
• Powertrain control module (pcm) (behind center of i/p)
• 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) (left side of transmission)
• Vss return

DEFOGGERS

Defogger Wiring Diagram for GMC Pickup C1997 3500

List of elements for Defogger Wiring Diagram for GMC Pickup C1997 3500:

• (left side of i/p) convenience center
• C222
• G202 (behind left side of i/p)
• G305 (right "b" pillar)
• Hot in run
• Hot in run or start
• Htr-a/c fuse 12 25a
• Hvac control module
• I/p fuse block
• Left cargo door contactor
• Left rear cargo door defogger grid
• Pick-up w/ extended or crew cab
• Rear defogger switch
• Rear window defogger grid
• Right cargo door contactor
• Right rear cargo door defogger grid
• Rr-defog mini fuse 30a
• S218
• S268
• S410
• 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 Pickup C1997 3500

List of elements for Electronic Power Steering Wiring Diagram for GMC Pickup C1997 3500:

• (under left side of i/p) data link connector (dlc)
• 5 volt ref
• Battery feed
• Computer data lines system
• Electronic variable orifice (evo) solenoid (on steering pump)
• Evo sol feed
• Evo sol output
• G134 (front top of engine)
• Gauges fuse 4 10a
• Ground
• Hot at all times
• Hot in run or start
• I/p fuse block
• Ignition
• Pnk
• Pos sig out
• Position signal
• Power steering control module (pscm) (under center of i/p)
• S210 (i/p harn, approx 5 cm into data link connector breakout)
• S213
• S215
• S221 (i/p harn, gas: approx 20 cm from i/p cluster breakout; diesel: approx 5 cm into power steering control module breakokut)
• Security fuse 21 20a
• Sen rtn
• Sensor return
• Srl data class 13
• Steering wheel position sensor (on steering column)
• Vehicle control module (vcm) (in engine compt)
• Volt ref
• Vss out
• Vss signal input

ENGINE PERFORMANCE

4.3L

4.3L (VIN W), Engine Performance Wiring Diagrams (1 of 4) for GMC Pickup C1997 3500

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams (1 of 4) for GMC Pickup C1997 3500:

• (a/t) s162 (m/t) s147
• (attached to right rear of throttle body)
• (left front of electronic brake control module) evaporative emissions canister vent (evap)
• (lower right front portion of engine block, near crankshaft) crankshaft position sensor
• (right side of engine) evaporative emissions (evap) canister purge valve
• (right top of cyl head) g120
• 1-2 shift sol. ctrl
• 2-3 shift sol. ctrl
• 3-2 ctrl sol. ctrl
• A/c comp rly ctrl
• A/c compressor enable relay
• Bank 1 heated oxygen sensor (ho2s) no.1 (in exhaust pipe, near catalytic converter)
• Bank 2 heated oxygen sensor (ho2s) no.1 (in exhaust pipe, near catalytic converter)
• Bank 2 heated oxygen sensor (ho2s) no.2 (in exhaust pipe, near catalytic converter)
• Cam posit sens rtn
• Cam posit sens sig
• Camshaft position sensor (in distributor)
• Coil
• Crank posit sens rtn
• Crank posit sens sig
• Ect sens input
• Egr posit input
• Evap
• Evap sol purge ctrl
• G120 (right front of engine block)
• Ground
• Hall effect sensor
• Iat sens sig
• Idle air control (iac) valve motor
• Idle air ctrl (iac) a hi
• Idle air ctrl (iac) b lo
• Ign feed
• Inj no.1 ctrl
• Inj no.2 ctrl
• Inj no.3 ctrl
• Inj no.4 ctrl
• Inj no.5 ctrl
• Inj no.6 ctrl
• Knock sens sig
• Knock sensor (forward of starter, on engine block)
• Left sens hi
• Left sens lo
• Map sens input
• Mass air flow sens sig
• Nca
• Pnk
• Post-catalyst sens hi
• Post-catalyst sens lo
• Power
• Pre-catalyst sens hi
• Pre-catalyst sens lo
• Purge valve
• Right sens hi
• Right sens lo
• S103
• S148
• S149
• Sens rtn
• Sens sig
• Sensor ground
• Tan
• Tcc on/off sol. ctrl
• Tcc pwm sol ctrl
• Throttle posit sens
• Trans temp sens sig
• Underhood fuse-relay center (left rear of engine compartment, on fender)
• Vcm ground
• Vehicle control module (vcm) (in engine compartment, near brake pressure modulator valve (bpmv), at left front wheelhouse)
• Vehicle spd sense sig
• Vehicle speed sensor (left rear side of transmission) (left side of transfer case-w/4wd)
• Vss rtn
• Vss signal

4.3L (VIN W), Engine Performance Wiring Diagrams (2 of 4) for GMC Pickup C1997 3500

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams (2 of 4) for GMC Pickup C1997 3500:

• 1-2 shift sol.
• 2-3 shift sol.
• 3-2 control sol.
• Automatic transmission
• Bank 1 heated oxygen sensor (ho2s) no. 2 (in exhaust pipe, near catalytic converter)
• Ecm-1 fuse 20a
• Eng 1 fuse 20a
• Exhaust gas recirculation valve (egr) (left top rear of engine, above valve cover)
• Fuel inj. no.1
• Fuel inj. no.2
• Fuel inj. no.3
• Fuel inj. no.4
• Fuel inj. no.5
• Fuel inj. no.6
• Hot in run & start
• Nca
• Note: fuel injectors are located in central sfi, center of intake manifold
• Pnk
• Pnk pnk
• Pressure control solenoid valve
• Red
• S104
• S108
• S161
• Tan
• Tcc on/off sol.
• Tcc pwm sol.
• Transmission fluid temperature (tft) sensor (internal)
• Under hood fuse-relay center

4.3L (VIN W), Engine Performance Wiring Diagrams (3 of 4) for GMC Pickup C1997 3500

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams (3 of 4) for GMC Pickup C1997 3500:

• (engine harness, approx 13 cm from breakout to egr valve)
• (engine harness, approx 4.5 cm from breakout to egr valve) s106
• (in fuel tank) fuel tank pressure sensor
• (inside left frame- rail, near rear crossmember) g416
• (right side of i/p, near blower motor) fuel tank sender module
• (right top of cylinder head) g120
• (taillamp extension harness, approx 6.5 cm from fuel pump harness breakout)
• 5v ref
• Engine coolant temperature sensor (top right front of engine, near thermostat housing)
• Fuel gauge sensor sig
• Fuel level signal
• Fuel pump & sender (in fuel tank)
• Fuel pump/oil pressure switch & sender (top center rear of engine, behind distributor)
• Gauges fuse 4 10a
• Hot in off, run or start
• Hot in run or start
• I/p fuse block
• Ign
• Input fuel gauge
• Input oil gauge
• Input tachometer
• Instrument cluster
• Intake air temp sensor (in air intake duct)
• M/t only
• Manifold absolute pressure (map) sensor (top right center of engine, near fuel injectors)
• Map
• Mass air flow sensor (maf)
• Pnk
• Red
• Ref 5 volt
• Ref lo
• S100
• S180
• S213
• S231
• S232 (engine harness, approx 7 cm in breakout to egr valve)
• S430
• Service engine soon indicator
• Signal fuel level
• Speedometer input
• Tan
• Tan a
• Temp
• Throttle position (tp) sensor (on side of throttle body)
• Trans fuse 20 10a
• Upshift lamp

4.3L (VIN W), Engine Performance Wiring Diagrams (4 of 4) for GMC Pickup C1997 3500

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams (4 of 4) for GMC Pickup C1997 3500:

• (engine compt., i/p harness, approx 6.5 cm into ebcm breakout)
• (engine harness, approx 13 cm into ebcm breakout)
• (engine harness, approx 4 cm from breakout to taillamp harness)
• (engine harness, approx 6.5 cm from underhood fuse-relay center breakout)
• (engine harness, approx 6.5 cm into ebcm breakout)
• (i/p harness, approx 20 cm from i/p cluster breakout)
• (i/p harness, approx 20 cm from right of heater and a/c control breakout)
• (or
• (right front of engine near thermostat housing) g119
• 12v battery fused
• 20a
• 4 whl dr tt feed
• 4wd input
• 5v ref. voltage
• 5v return
• A pnk
• A/c request signal
• A/t
• A/t only
• Air conditioning system
• Brake sw input
• Brake switch assembly (top of brake pedal)
• Brake switch input
• Check eng lp ind out
• Clutch pedal position (cpp) switch (at top of clutch pedal)
• Cruise control module (left rear side of engine compartment, on bulkhead)
• Cruise ctrl sig-eng
• Cruise pdl sw out
• Data link connector (under left side of i/p)
• Distributor
• Ecm b f11
• Electronic brake control module (ebcm) (near brake master cylinder, at left front wheelhouse)
• Est output sig
• Four whl dr sig lo
• Fuel a pump prime connector
• Fuel level
• Fuel pump relay
• Fuel pump rly ctrl
• Fuel sender grd
• Fused output
• G120 (right top of cylinder head)
• Ground
• High voltage coil wire
• Hot in run
• Hot in run or start
• I/p fuse block
• Ign input
• Ign timing sig.
• Ignition coil (right rear side of engine)
• Ignition control module (right rear side of engine)
• Ignition feed
• M/t
• M4 brake fuse 18 10a n3
• Mini fuse g12
• Pnk
• Power
• Power steering control module (center of i/p)
• Press ctrl sol lo
• Press ctrl sol. hi
• Radio
• Red
• S101
• S103
• S111
• S150
• S151
• S152
• S153
• S180
• S221
• S222
• Serial data sig
• Service circuit power
• Shift ind lp out
• Speed sensor
• Speed sensor input
• Stoplamp/ clutch switch input
• Switch signal
• Tach. sig.
• Trans press sig-bit 1
• Trans press sig-bit 2
• Trans press sig-bit 3
• Transfer case control module (under i/p, on steering column support bracket)
• Transfer case switch (left top of transfer case)
• Transmissions system (4 wheel drive indicator circuit)
• Underhood fuse- relay center
• Vcm ground
• Vcm input
• Vehicle control module (vcm) (in engine compartment, near brake pressure modulator valve (bpmv), at left front wheelhouse)
• Vss input
• Vss sig

5.0L

5.0L (VIN M), Engine Performance Wiring Diagrams (1 of 4) for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), Engine Performance Wiring Diagrams (1 of 4) for GMC Pickup C1997 3500:

• (attached to right rear of throttle body) idle air control (iac) valve
• (lower right front portion of engine block, near crankshaft) crankshaft position sensor
• (right side of engine) evaporative emission canister purge valve
• (right top of cyl. head) g120
• 1-2 shift sol. ctrl
• 2-3 shift sol. ctrl
• A/c comp rly ctrl
• A/c compressor clutch relay
• Bank 1 heated oxygen sensor no. 1 (in exhaust pipe in front of left catalytic converter)
• Bank 1 heated oxygen sensor no. 2 (in exhaust pipe in back of left catalytic converter)
• Bank 2 heated oxygen sensor no. 1 (in exhaust pipe in front of right catalytic converter)
• Cam posit sens sig
• Camshaft position sensor (in distributor)
• Coil
• Crank posit sens sig
• Ect sens sig
• Egr posit sig
• Egr sol ctrl
• Evap sol purge ctrl
• G120 (right front of engine block)
• Ground
• Iat sens sig
• Idle air ctrl (iac) a hi
• Idle air ctrl (iac) b lo
• Ign feed
• Ignition
• Inj no.1 ctrl
• Inj no.2 ctrl
• Inj no.3 ctrl
• Inj no.4 ctrl
• Inj no.5 ctrl
• Inj no.6 ctrl
• Inj no.7 ctrl
• Inj no.8 ctrl
• Knock sens sig
• Knock sensor (left side of engine block, below exhaust manifold, forward of starter)
• Left post ctylst hi
• Left post-ctylst lo
• Left sens hi (precat)
• Left sens lo (precat)
• Map sens input
• Mass air flow sens sig
• Nca
• Pnk
• Pnk c ignition feed
• Right post-ctlyst hi
• Right post-ctlyst lo
• Right sens hi (precat)
• Right sens lo (precat)
• S103
• S148
• S149
• S162
• Sens rtn
• Sens sig
• Sensor return
• Shift sol. ctrl
• Tan
• Tcc sol ctrl
• Tcc sol. ctrl
• Temp sens input
• Throttle posit sens
• Underhood fuse-relay center
• Vcm ground
• Vehicle control module (vcm) (in engine compartment, near brake pressure modulator valve (bpmv), at left front wheelhouse)
• Vehicle speed sensor (left rear side of transmission) (if equipped w/4wd) (left side of transfer case)
• Vss rtn
• Vss sig
• Vss signal

5.0L (VIN M), Engine Performance Wiring Diagrams (2 of 4) for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), Engine Performance Wiring Diagrams (2 of 4) for GMC Pickup C1997 3500:

• (w/4l60-e trans.)
• (w/4l80-e trans.)
• 1-2 shift solenoid
• 2-3 shift solenoid
• 3-2 shift solenoid
• Automatic transmission
• Bank 2 heated oxygen sensor no. 2 (in exhaust pipe in back of right catalytic converter)
• Ecm-1 mini fuse 20a
• Eng-1 k7
• Exhaust gas recirculation (egr) valve (front of engine near thermostat housing)
• Fluid pressure (tfp) manual valve position switch
• Fluid temperature sensor (internal)
• Fuel inj. no.1
• Fuel inj. no.2
• Fuel inj. no.3
• Fuel inj. no.4
• Fuel inj. no.5
• Fuel inj. no.6
• Fuel inj. no.7
• Fuel inj. no.8
• Hot in run & start
• Ignition
• Mini fuse 20a l8
• Nca
• Note: fuel injectors are located in central sfi, center of intake manifold
• Pnk
• Pnk pnk pnk tan
• Pressure control solenoid valve
• Red
• S104
• S108
• S161
• Tan
• Tcc solenoid
• Torque convertor clutch pulse width modulation solenoid
• Under hood fuse-relay center
• W/4l60e 4-speed trans. only

5.0L (VIN M), Engine Performance Wiring Diagrams (3 of 4) for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), Engine Performance Wiring Diagrams (3 of 4) for GMC Pickup C1997 3500:

• (engine harness, approx 13 cm from breakout to egr valve)
• (engine harness, approx 4.5 cm from breakout to egr valve)
• (engine harness, approx 7 cm in breakout to egr valve)
• (inside left frame rail, near rear crossmember) g415
• (not used)
• (right front of engine, near thermostat housing) g119
• (right top of cylinder head) g120
• (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)
• Engine coolant temperature sensor (top right front of engine, near thermostat housing)
• Evaporative emission canister vacuum switch (right side of engine)
• Fuel pump & sender (in fuel tank)
• Fuel pump balance module (inside left side of frame rail near transmission crossmember)
• Fuel pump balance relay (on fuel pump balance module)
• Fuel pump/ oil pressure switch (top center rear of engine, behind distributor)
• 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 f7
• 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 center of engine, near fuel injectors)
• Mass air flow sensor (air intake duct near air filter)
• Mini fuse 10a
• Output to gage
• Pnk
• Pnk a
• Pnk pnk tan
• Primary tank fuel level signal
• Relay ctrl
• S100
• S103
• S106
• S180
• S213
• S231
• S232
• S276
• S315
• S318
• Service engine soon indicator
• Speedometer input
• Tan
• Tan a
• Throttle position sensor (on side of throttle body)
• Trans fuse 20 10a
• Underhood fuse-relay center pnk
• Upshift lamp
• W/dual fuel tanks
• W/o dual fuel tanks
• W/o dual fuel tanks

5.0L (VIN M), Engine Performance Wiring Diagrams (4 of 4) for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), Engine Performance Wiring Diagrams (4 of 4) for GMC Pickup C1997 3500:

• (engine compt., i/p harness, approx 6.5 cm into ebcm breakout)
• (engine harness, approx 13 cm into ebcm breakout)
• (engine harness, approx 38.5 cm from underhood fuse/relay center)
• (engine harness, approx 6.5 cm from underhood fuse-relay center breakout)
• (engine harness, approx 6.5 cm into ebcm breakout)
• (i/p harness, approx 20 cm from i/p cluster breakout)
• (or
• (right top of cylinder head) g120
• 20a
• 4wd input
• 5v ref. voltage
• 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
• Cruise control module (left rear side of engine compartment, on bulkhead)
• Cruise ctrl sig eng
• Cruise pdl sw out
• Data link connector (under left side of i/p)
• Distributor
• Ecm-b f11
• Electronic brake control module (ebcm) (near brake master cylinder, at left front wheelhouse)
• Est output sig
• Evap purge vac sw
• Force motor feed
• Force motor return
• Four whl dr sig
• Four whl dr sig lo
• Fuel a pump prime connector
• Fuel pump relay
• Fuel pump rly ctrl
• 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 (right rear side of engine)
• Ignition coil driver (right rear side of engine)
• Ignition feed
• M/t
• M4 brake fuse 18 10a n3
• Mini fuse g12
• Pnk
• Pnk a
• Power steering control module (center of i/p)
• Pressure switch input
• Radio
• Red
• S101
• S103
• S111 (engine harness, approx 4 cm from breakout to taillamp harness)
• S150
• S151
• S152
• S153
• S163
• S221
• Sensor ground
• Sensor return
• Serial data sig
• Service circuit power
• 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 i/p, 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 ground
• Vcm sig
• Vehicle control module (vcm) (in engine compartment, near brake pressure modulator valve (bpmv), at left front wheelhouse)
• Vss input
• Vss sig out

5.7L

5.7L (VIN R), Engine Performance Wiring Diagrams (1 of 4) for GMC Pickup C1997 3500

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams (1 of 4) for GMC Pickup C1997 3500:

• (attached to right rear of throttle body) idle air control (iac) valve
• (lower right front portion of engine block, near crankshaft) crankshaft position sensor
• (right side of engine) evaporative emission canister purge valve
• (right top of cyl. head) g120
• 1-2 shift sol. ctrl
• 2-3 shift sol. ctrl
• A/c comp rly ctrl
• A/c compressor clutch relay
• Bank 1 heated oxygen sensor no. 1 (in exhaust pipe in front of left catalytic converter)
• Bank 1 heated oxygen sensor no. 2 (in exhaust pipe in back of left catalytic converter)
• Bank 2 heated oxygen sensor no. 1 (in exhaust pipe in front of right catalytic converter)
• Cam posit sens sig
• Camshaft position sensor (in distributor)
• Coil
• Crank posit sens sig
• Ect sens sig
• Egr posit sig
• Egr sol ctrl
• Evap sol purge ctrl
• G120 (right front of engine block)
• Ground
• Iat sens sig
• Idle air ctrl (iac) a hi
• Idle air ctrl (iac) b lo
• Ign feed
• Ignition
• Inj no.1 ctrl
• Inj no.2 ctrl
• Inj no.3 ctrl
• Inj no.4 ctrl
• Inj no.5 ctrl
• Inj no.6 ctrl
• Inj no.7 ctrl
• Inj no.8 ctrl
• Knock sens sig
• Knock sensor (left side of engine block, below exhaust manifold, forward of starter)
• Left post ctylst hi
• Left post-ctylst lo
• Left sens hi (precat)
• Left sens lo (precat)
• Map sens input
• Mass air flow sens sig
• Nca
• Pnk
• Pnk c ignition feed
• Right post-ctlyst hi
• Right post-ctlyst lo
• Right sens hi (precat)
• Right sens lo (precat)
• S103
• S148
• S149
• S162
• Sens rtn
• Sens sig
• Sensor return
• Shift sol. ctrl
• Tan
• Tcc sol ctrl
• Tcc sol. ctrl
• Temp sens input
• Throttle posit sens
• Underhood fuse-relay center
• Vcm ground
• Vehicle control module (vcm) (in engine compartment, near brake pressure modulator valve (bpmv), at left front wheelhouse)
• Vehicle speed sensor (left rear side of transmission) (if equipped w/4wd) (left side of transfer case)
• Vss rtn
• Vss sig
• Vss signal

5.7L (VIN R), Engine Performance Wiring Diagrams (2 of 4) for GMC Pickup C1997 3500

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams (2 of 4) for GMC Pickup C1997 3500:

• (w/4l60-e trans.)
• (w/4l80-e trans.)
• 1-2 shift solenoid
• 2-3 shift solenoid
• 3-2 shift solenoid
• Automatic transmission
• Bank 2 heated oxygen sensor no. 2 (in exhaust pipe in back of right catalytic converter)
• Ecm-1 mini fuse 20a
• Eng-1 k7
• Exhaust gas recirculation (egr) valve (front of engine near thermostat housing)
• Fluid pressure (tfp) manual valve position switch
• Fluid temperature sensor (internal)
• Fuel inj. no.1
• Fuel inj. no.2
• Fuel inj. no.3
• Fuel inj. no.4
• Fuel inj. no.5
• Fuel inj. no.6
• Fuel inj. no.7
• Fuel inj. no.8
• Hot in run & start
• Ignition
• Mini fuse 20a l8
• Nca
• Note: fuel injectors are located in central sfi, center of intake manifold
• Pnk
• Pnk pnk pnk tan
• Pressure control solenoid valve
• Red
• S104
• S108
• S161
• Tan
• Tcc solenoid
• Torque convertor clutch pulse width modulation solenoid
• Under hood fuse-relay center
• W/4l60e 4-speed trans. only

5.7L (VIN R), Engine Performance Wiring Diagrams (3 of 4) for GMC Pickup C1997 3500

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams (3 of 4) for GMC Pickup C1997 3500:

• (engine harness, approx 13 cm from breakout to egr valve)
• (engine harness, approx 4.5 cm from breakout to egr valve)
• (engine harness, approx 7 cm in breakout to egr valve)
• (inside left frame rail, near rear crossmember) g415
• (not used)
• (right front of engine, near thermostat housing) g119
• (right top of cylinder head) g120
• (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)
• Engine coolant temperature sensor (top right front of engine, near thermostat housing)
• Evaporative emission canister vacuum switch (right side of engine)
• Fuel pump & sender (in fuel tank)
• Fuel pump balance module (inside left side of frame rail near transmission crossmember)
• Fuel pump balance relay (on fuel pump balance module)
• Fuel pump/ oil pressure switch (top center rear of engine, behind distributor)
• 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 f7
• 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 center of engine, near fuel injectors)
• Mass air flow sensor (air intake duct near air filter)
• Mini fuse 10a
• Output to gage
• Pnk
• Pnk a
• Pnk pnk tan
• Primary tank fuel level signal
• Relay ctrl
• S100
• S103
• S106
• S180
• S213
• S231
• S232
• S276
• S315
• S318
• Service engine soon indicator
• Speedometer input
• Tan
• Tan a
• Throttle position sensor (on side of throttle body)
• Trans fuse 20 10a
• Underhood fuse-relay center pnk
• Upshift lamp
• W/dual fuel tanks
• W/o dual fuel tanks
• W/o dual fuel tanks

5.7L (VIN R), Engine Performance Wiring Diagrams (4 of 4) for GMC Pickup C1997 3500

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams (4 of 4) for GMC Pickup C1997 3500:

• (engine compt., i/p harness, approx 6.5 cm into ebcm breakout)
• (engine harness, approx 13 cm into ebcm breakout)
• (engine harness, approx 38.5 cm from underhood fuse/relay center)
• (engine harness, approx 6.5 cm from underhood fuse-relay center breakout)
• (engine harness, approx 6.5 cm into ebcm breakout)
• (i/p harness, approx 20 cm from i/p cluster breakout)
• (or
• (right top of cylinder head) g120
• 20a
• 4wd input
• 5v ref. voltage
• 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
• Cruise control module (left rear side of engine compartment, on bulkhead)
• Cruise ctrl sig eng
• Cruise pdl sw out
• Data link connector (under left side of i/p)
• Distributor
• Ecm-b f11
• Electronic brake control module (ebcm) (near brake master cylinder, at left front wheelhouse)
• Est output sig
• Evap purge vac sw
• Force motor feed
• Force motor return
• Four whl dr sig
• Four whl dr sig lo
• Fuel a pump prime connector
• Fuel pump relay
• Fuel pump rly ctrl
• 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 (right rear side of engine)
• Ignition coil driver (right rear side of engine)
• Ignition feed
• M/t
• M4 brake fuse 18 10a n3
• Mini fuse g12
• Pnk
• Pnk a
• Power steering control module (center of i/p)
• Pressure switch input
• Radio
• Red
• S101
• S103
• S111 (engine harness, approx 4 cm from breakout to taillamp harness)
• S150
• S151
• S152
• S153
• S163
• S221
• Sensor ground
• Sensor return
• Serial data sig
• Service circuit power
• 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 i/p, 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 ground
• Vcm sig
• Vehicle control module (vcm) (in engine compartment, near brake pressure modulator valve (bpmv), at left front wheelhouse)
• Vss input
• Vss sig out

6.5L

6.5L (VIN S), Engine Performance Wiring Diagrams (1 of 4) for GMC Pickup C1997 3500

List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams (1 of 4) for GMC Pickup C1997 3500:

• (engine harness, approx 43 cm from breakout to ebcm)
• (engine harness, approx 8 cm from fuel heater breakout)
• (engine jumper harness)
• (engine sensor harness)
• (front engine cover) crankshaft position (ckp) sensor)
• (front of engine)
• (i/p harness, approx 16 cm into i/p cluster breakout)
• (left lower front of engine) engine coolant temperature (ect) sensor
• (right top of cylinder head) g119
• 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 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 (right of steering column)
• 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
• Heavy duty electronic 4-spd automatic overdrive transmission
• Intake air temperature (iat) sensor
• Intake man air temp sens
• Map sens input
• Nca
• On/off
• Pnk
• Powertrain control module (pcm) (under right end of i/p, above 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 (below left side of i/p)
• Vss hi
• Vss output
• Vss rtn
• Vss sig

6.5L (VIN S), Engine Performance Wiring Diagrams (2 of 4) for GMC Pickup C1997 3500

List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams (2 of 4) for GMC Pickup C1997 3500:

• (engine harness, approx 4 cm from i/p harness breakout)
• (engine jumper harness, toward fuel temperature sensor)
• 5 volt ref
• Accelerator pedal position (app) module (below i/p, attached to accelerator bracket)
• 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 h7
• Electronic brake control module (left frame rail, near center of vehicle)
• Engine shutoff solenoid
• Fuel f5
• Fuel solenoid
• Fuel solenoid driver
• Fuel temperature sensor
• Fuse 20a
• High res sig
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block
• M4 brake fuse 18 10a n3
• 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
• Sol fuse 20a
• Tan d
• Timing stepper motor (top front of engine)
• Underhood fuse-relay center

6.5L (VIN S), Engine Performance Wiring Diagrams (3 of 4) for GMC Pickup C1997 3500

List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams (3 of 4) for GMC Pickup C1997 3500:

• (engine harness, approx 37 cm from breakout to fuel relay center) s100
• (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 (left rear 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

6.5L (VIN S), Engine Performance Wiring Diagrams (4 of 4) for GMC Pickup C1997 3500

List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams (4 of 4) for GMC Pickup C1997 3500:

• "serv eng soon" ind
• "serv throttle soon" ind
• (engine harness, approx 13 cm into ebcm breakout)
• (engine harness, approx 13 cm into generator breakout)
• (engine harness, approx 34 cm from bulkhead to inside of pass compt)
• (engine harness, approx 64 cm from glow plug controller)
• (engine jumper harness, from fuel solenoid driver)
• (left side of i/p)
• (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) (at left front wheelhouse)
• Eng-i k7
• Engine shutoff sol out
• Exhaust gas recirculation (egr) vent solenoid
• Exhaust gas recirculation egr solenoid (left rear top of engine)
• Fuel heater (top rear of engine)
• Fuel sol module (5 vref)
• Fuel sol module feed
• Fuse 10a
• 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 (left rear of engine near bulkhead)
• Glow plugs g4
• Grd
• Ground
• Hot at all times
• Hot in run or start
• Ign
• Ignition
• Maf
• Mass air flow (maf) sensor
• Pcm gnd
• Pnk
• Powertrain control module (pcm) (under right end of i/p, above 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 no.2 ref voltage
• Underhood fuse-relay center
• Wait to start ind
• Wastegate sol
• Wastegate solenoid

EXTERIOR LIGHTS

Back-up Lamps Wiring Diagram for GMC Pickup C1997 3500

List of elements for Back-up Lamps Wiring Diagram for GMC Pickup C1997 3500:

• (left side of trans) backup lamp switch
• A/t
• Backup lamps signal (trailer tow package) (wire cut and taped to harness)
• C218
• Convenience center (under left side of dash)
• G415 (left frame rail, behind bumper)
• Hot in run, bulb test or start
• I/p fuse block
• Left backup lamp
• M/t
• Mirrors system
• Park/neutral position switch (left top of trans)
• Pnk
• Right backup lamp
• S411
• S414
• Turn b/u fuse 16 20a

Exterior Lamps Wiring Diagram for GMC Pickup C1997 3500

List of elements for Exterior Lamps Wiring Diagram for GMC Pickup C1997 3500:

• (forward lamps harn, 7cm from left headlamp breakout) s122
• (forward lamps harness, 5cm from right headlamp breakout) s122
• (frame ground: on rear of vehicle)
• (front to rear body harness, near chmsl harness breakout)
• (i/p harness, 12 cm from steering column breakout) s210
• (i/p harness, 4cm into i/p cluster breakout) s267
• (i/p harness, 8cm into i/p cluster breakout) s214
• (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
• C219
• C220
• Cab clearance lamps
• Cargo lamp
• Cargo lamp switch
• Center high mount stop lamp
• Ch- msl lp
• Column harness breakout)
• Convenience center (under left side of dash)
• Cr lp
• Cruise control system
• Ctsy fuse 20a
• Fuse block
• G108 (left radiator support, near left headlamp)
• G120 (gas: right front of engine block; diesel: right top of cylinder head)
• G1o1 (right inner fender, below underhood reel lamp)
• G202 (behind left side of dash)
• G202 (behind left side of i/p)
• 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
• Platform hitch ground
• 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
• S251
• 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 15a
• 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 5) for GMC Pickup C1997 3500

List of elements for Ground Distribution Wiring Diagram (1 of 5) for GMC Pickup C1997 3500:

• (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
• Auxiliary cooling fan motor
• Auxiliary fan control switch
• Btsi ground
• C10
• Cargo lamp switch (pickup)
• Cigar lighter
• Convenience center
• D10
• D12
• D13
• Data link connector
• Daytime running lamps module
• Fog lamp switch
• From convenience center (diagram 3 of 4)
• 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 i/p)
• 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
• Power outlet
• 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
• Steering column ground
• Transfer case control module
• Transfer case select switch
• Turn/ hazard flasher
• Uncoated
• W/ dual horns
• W/ v22 (quad headlamps)
• Windshield wiper motor module

Ground Distribution Wiring Diagram (2 of 5) for GMC Pickup C1997 3500

List of elements for Ground Distribution Wiring Diagram (2 of 5) for GMC Pickup C1997 3500:

• (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)
• (not used)
• (oxygen sensor jumper harness, approx 22 cm into harness)
• (right front of engine block)
• 4.3l
• A/c compressor clutch
• A/c compressor clutch relay
• A/c compressor cycling switch
• A/c high pressure cutout switch
• Air reaction injection (secondary) pump (7.4l only)
• Balance fuel gage sender
• Blower motor
• Brake pressure warning switch
• Cruise control module
• Data link connector
• Electronic brake control module
• Evaporative emissions purge vacuum solenoid switch
• Except 4.3l
• Front axle actuator
• Front mode door motor
• Front temperature door motor
• Fuel pump and sender
• Fuel pump balance module
• Fuel pump relay
• G120
• G131 (near thermostat housing)
• G134 (front top of engine)
• Gasoline
• Heated oxygen sensor bank 1 sensor 1
• Heated oxygen sensor bank 1 sensor 2
• Heated oxygen sensor bank 2 sensor 1
• Heated oxygen sensor bank 2 sensor 2
• High a/c pressure cutout switch
• High blower motor relay
• Ignition coil module
• Instrument cluster
• Mass airflow sensor
• Park/ neutral position switch
• Power steering control module
• Recirculation door motor
• 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)
• S180 (engine harness, approx 21-36 cm from under hood lamp breakout)
• S185
• S186
• S215
• S244 (hvac harness, approx 15 cm from recirculation door breakout)
• S302
• S317 (taillamp extension harness, approx 10 cm from fuel pump and sender breakout)
• Starter relay
• Stoplamp relay
• Transfer case relay
• Under- hood lamp
• Under- hood reel lamp
• Underhood fuse- relay center
• Vehicle control module
• W/ dual tanks
• W/o dual tanks (except 4.3l)
• Water valve

Ground Distribution Wiring Diagram (3 of 5) for GMC Pickup C1997 3500

List of elements for Ground Distribution Wiring Diagram (3 of 5) for GMC Pickup C1997 3500:

• (crossbody harness, approx 6 cm into seat belt switch breakout)
• (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)
• 4.3l only
• Balance fuel gage sender
• Bench seat
• C210
• C220
• Center high mount stop- lamp
• Convenience center
• Convenience center (under left side of i/p)
• Data link connector
• Diesel
• Door lock relay
• Electrochromic rearview mirror w/ compass
• Four-wheel drive indicator lamp
• Fuel gage sender
• Fuel pump and sender
• Fuel pump balance module
• Fuel pump relay
• G120 (right top of cylinder head)
• G416 (inside left framerail, near rear crossmember)
• Instrument cluster
• Interior lamp control module
• Left clearance lamp
• Left front power window lock switch
• Left illuminated vanity mirror
• Left power lumbar support motor
• Left rear power window switch
• Mass airflow sensor
• Others
• Power amplifier
• Power amplifier relay
• Power lumbar motor
• Power outside rearview mirror switch
• Power steering control module
• Powertrain control module
• Rear window lockout switch
• Remote control door lock receiver
• Right clearance lamp
• Right front power window switch
• Right illuminated vanity mirror
• Right power left power seat
• Right power lumbar support motor
• Right rear power window switch
• Roof marker lamps
• S103 (engine harness, approx 11 cm from breakout to right side glow plugs)
• S215
• S251 (crossbody harness, approx 12 cm right of left door harness breakout)
• S259
• 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)
• S500
• Seat belt switch
• To g202 (diagram 1 of 4)
• Transfer case mode selector illumination lamp
• Under- hood fuse- relay center
• Vehicle speed sensor buffer

Ground Distribution Wiring Diagram (4 of 5) for GMC Pickup C1997 3500

List of elements for Ground Distribution Wiring Diagram (4 of 5) for GMC Pickup C1997 3500:

• (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)
• Auxiliary heater- a/c logic module
• Balance fuel pump
• Center high mount stoplamp
• Chassis cab & heavy duty
• Door contact button
• Door lock control module
• Endgate marker lamps
• Except chassis cab & heavy duty
• Front auxiliary heater-a/c control module
• Front dome lamp
• Fuel lift pump
• G202 (left side of i/p)
• G305 (right 'b' pillar)
• G415 (frame ground, rear of vehicle)
• G415 (left frame rail, behind bumper)
• G416 (left frame rail, near rear crossmember)
• 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 auxiliary mode door motor
• Rear auxiliary temp door motor
• Rear blower motor
• Rear dome lamp
• 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 door jamb switch
• Right rear fender
• Right rear tail, stop, license, turn & backup lamps
• Right rear tail, stop, turn & backup lamps
• Right tail, stop, turn & backup lamps
• S307 (rear hvac control harness, approx 10 cm from hvac logic module breakout)
• S319 (taillamp extension harness, approx 10 cm from fuel pump and sender breakout (fuel gage sender breakout-diesel))
• 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
• W/ dual tanks

Ground Distribution Wiring Diagram (5 of 5) for GMC Pickup C1997 3500

List of elements for Ground Distribution Wiring Diagram (5 of 5) for GMC Pickup C1997 3500:

• (engine harness, 28 cm from a/c compressor clutch connector)
• (right top of cylinder head)
• A/c compressor clutch
• A/c compressor clutch relay
• A/c low pressure switch
• Blower motor
• Brake pressure warning switch
• Diesel
• Electronic brake control module
• Front axle actuator
• Front mode door motor
• Front temperature door motor
• Fuel heater
• G117
• Glow plug relay
• High blower motor relay
• Low coolant level sensor
• Park/ neutral position switch
• Recirculation door motor
• S107 (engine harness, approx 30 cm from breakout to ebcm)
• S147 (engine harness, approx 4 cm from breakout to right side glow plugs)
• S185
• S186
• S244 (hvac harness, approx 15 cm from recirculation door breakout)
• S302 (4wd harness, approx 10 cm from transfer case relay breakout)
• Starter relay
• Stoplamp relay
• Transfer case relay
• Under- hood lamp
• Under- hood reel lamp
• Underhood fuse- relay center
• Water-in- fuel sensor

HEADLIGHTS

Headlight Wiring Diagram, with Quad Headlamps for GMC Pickup C1997 3500

List of elements for Headlight Wiring Diagram, with Quad Headlamps for GMC Pickup C1997 3500:

• (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 Pickup C1997 3500

List of elements for Headlight Wiring Diagram, with Sealed Beam Headlamps for GMC Pickup C1997 3500:

• (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 Pickup C1997 3500

List of elements for Horn Wiring Diagram for GMC Pickup C1997 3500:

• (forward lamps harn, 26.5 cm from left headlamp breakout) s124
• G101 (right inner fender, below underhood reel lamp)
• Horn mini fuse 20a
• Horn relay
• Horn slip ring
• Horn switch
• Hot at all times
• Left horn (front of vehicle)
• Nca
• Right horn (front of vehicle)
• S128
• Steering wheel
• Underhood fuse-relay center

INSTRUMENT CLUSTER

4.3L

4.3L (VIN W), Instrument Cluster Wiring Diagram for GMC Pickup C1997 3500

List of elements for 4.3L (VIN W), Instrument Cluster Wiring Diagram for GMC Pickup C1997 3500:

• (6 bulbs)
• (engine harn, 20 cm into ebcm breakout)
• (engine harn, 7 cm from egr valve)
• (taillamp harn, 6.5 cm from fuel pump harn breakout)
• +5 v
• A/t
• Accy
• Air bag
• Anti- lock brakes
• Anti-lock brakes system
• Bat
• Belt
• Brake
• Brake ind in
• Brake pressure modulator valve (left front wheelhouse)
• Brake pressure warning switch (on rear of brake pressure modulator valve body)
• Bulb test
• C100
• Check gauges
• Check gauges lamp driver
• Daytime running lamps
• Daytime running lamps module (left side of i/p)
• Diode 1
• Engine coolant temperature sender (left cylinder head)
• Exterior lights system
• Fuel gauge
• Fuel lev
• Fuel pump & sender (in front fuel tank)
• Fuel pump/ oil pressure switch & sender (left rear side of engine)
• Fuel tank sender module (right side of i/p)
• G119 (near thermostat housing)
• G119 (right front of engine block)
• Gauges fuse 4 10a
• Headlights system
• Hi beam
• Hot in run or start
• I/p fuse block (behind left side of i/p)
• Ign
• Ignition coil (right rear side of engine)
• Ignition switch
• Illum
• Illumination
• Instrument cluster
• Interior lights system
• Led dimming
• Left turn
• Lock
• M/t
• Mil ind
• Off
• Oil gauge
• Parity prndl
• Park brake warning switch (left side of i/p)
• Pnk
• Prndl
• Prndl a
• Prndl b
• Prndl c
• Right turn
• Run
• S147
• S157
• S162
• S213
• S215
• S232
• S430
• Safety
• Sens rtn
• Service engine soon
• 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 (left rear of engine compt)
• Upshift (m/t only)
• Upshift ind
• Vehicle control module (left front wheelhouse)
• Vehicle speed sensor (left rear of transmission)
• Voltmeter
• Vss
• Warning systems

5.0L

5.0L (VIN M), Instrument Cluster Wiring Diagram for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), Instrument Cluster Wiring Diagram for GMC Pickup C1997 3500:

• (6 bulbs)
• (engine harn, 20 cm into ebcm breakout)
• A/t
• Accy
• Air bag
• Anti- lock brakes
• Anti-lock brakes system
• Balance fuel gage sender (in rear fuel tank)
• Bat
• Belt
• Brake
• Brake ind in
• Brake pressure modulator valve (left front wheelhouse)
• Brake pressure warning switch (on rear of brake pressure modulator valve body)
• Bulb test
• C100
• Check gauges
• Check gauges lamp driver
• Daytime running lamps
• Daytime running lamps module (left side of i/p)
• Diode 1
• Engine controls system (fuel pump balance relay)
• Engine coolant temperature sender (left cylinder head)
• Exterior lights system
• Fuel gauge
• Fuel pump & sender (in front fuel tank)
• Fuel pump & sender (in fuel tank)
• Fuel pump balance module (near transmission crossmember)
• Fuel pump/ oil pressure switch & sender (left rear side of engine)
• G119 (near thermostat housing)
• G119 (right front of engine block)
• Gauges fuse 4 10a
• Headlights system
• Hi beam
• Hot in run or start
• Hot in run, bulb test or start
• I/p fuse block (behind left side of i/p)
• Ign
• Ign e mini fuse 10a
• Ignition coil (right rear side of engine)
• Ignition switch
• Illum
• Illumination
• Instrument cluster
• Interior lights system
• Led dimming
• Left turn
• Lock
• M/t
• Mil ind
• Off
• Oil gauge
• Parity prndl
• Park brake warning switch (left side of i/p)
• Pnk
• Prndl
• Prndl a
• Prndl b
• Prndl c
• Right turn
• Run
• S103
• S146
• S147
• S157
• S162
• S213
• S215
• S317
• Safety
• Service engine soon
• 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
• Underhood fuse-relay center (left rear of engine compt)
• Upshift (m/t only)
• Upshift ind
• Vehicle control module (left front wheelhouse)
• Vehicle speed sensor (left rear of transmission)
• Voltmeter
• Vss
• W/ dual fuel tanks
• W/o dual fuel tanks
• Warning systems

5.7L

5.7L (VIN R), Instrument Cluster Wiring Diagram for GMC Pickup C1997 3500

List of elements for 5.7L (VIN R), Instrument Cluster Wiring Diagram for GMC Pickup C1997 3500:

• (6 bulbs)
• (engine harn, 20 cm into ebcm breakout)
• A/t
• Accy
• Air bag
• Anti- lock brakes
• Anti-lock brakes system
• Balance fuel gage sender (in rear fuel tank)
• Bat
• Belt
• Brake
• Brake ind in
• Brake pressure modulator valve (left front wheelhouse)
• Brake pressure warning switch (on rear of brake pressure modulator valve body)
• Bulb test
• C100
• Check gauges
• Check gauges lamp driver
• Daytime running lamps
• Daytime running lamps module (left side of i/p)
• Diode 1
• Engine controls system (fuel pump balance relay)
• Engine coolant temperature sender (left cylinder head)
• Exterior lights system
• Fuel gauge
• Fuel pump & sender (in front fuel tank)
• Fuel pump & sender (in fuel tank)
• Fuel pump balance module (near transmission crossmember)
• Fuel pump/ oil pressure switch & sender (left rear side of engine)
• G119 (near thermostat housing)
• G119 (right front of engine block)
• Gauges fuse 4 10a
• Headlights system
• Hi beam
• Hot in run or start
• Hot in run, bulb test or start
• I/p fuse block (behind left side of i/p)
• Ign
• Ign e mini fuse 10a
• Ignition coil (right rear side of engine)
• Ignition switch
• Illum
• Illumination
• Instrument cluster
• Interior lights system
• Led dimming
• Left turn
• Lock
• M/t
• Mil ind
• Off
• Oil gauge
• Parity prndl
• Park brake warning switch (left side of i/p)
• Pnk
• Prndl
• Prndl a
• Prndl b
• Prndl c
• Right turn
• Run
• S103
• S146
• S147
• S157
• S162
• S213
• S215
• S317
• Safety
• Service engine soon
• 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
• Underhood fuse-relay center (left rear of engine compt)
• Upshift (m/t only)
• Upshift ind
• Vehicle control module (left front wheelhouse)
• Vehicle speed sensor (left rear of transmission)
• Voltmeter
• Vss
• W/ dual fuel tanks
• W/o dual fuel tanks
• Warning systems

6.5L

6.5L (VIN S), Instrument Cluster Wiring Diagram (1 of 2) for GMC Pickup C1997 3500

List of elements for 6.5L (VIN S), Instrument Cluster Wiring Diagram (1 of 2) for GMC Pickup C1997 3500:

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

6.5L (VIN S), Instrument Cluster Wiring Diagram (2 of 2) for GMC Pickup C1997 3500

List of elements for 6.5L (VIN S), Instrument Cluster Wiring Diagram (2 of 2) for GMC Pickup C1997 3500:

• (engine harn, 20 cm into ebcm breakout)
• (i/p harn, 18 cm into cluster breakout)
• (i/p harn, 5 cm into power steering control module breakout)
• A/t
• Accy
• Anti-lock brakes system
• Balance fuel gage sender (in rear fuel tank)
• Brake ind in
• Brake pressure modulator valve (left front wheelhouse)
• Brake pressure warning switch (on rear of brake pressure modulator valve body)
• Bulb test
• C100
• Daytime running lamps module (left side of i/p)
• Diode 1
• Eng 1 mini fuse 20a
• Engine controls system
• Engine controls system (fuel pump balance relay)
• Fuel gage sender
• Fuel pump & sender
• Fuel pump balance module (inside left side of frame rail near trans. crossmember)
• G117 (top rear of right cylinder head)
• Gauges fuse 4 10a
• Hot in run, bulb test or start
• I/p fuse block (behind left side of i/p)
• Ign e mini fuse 10a
• Ignition switch
• Lock
• M/t
• Off
• Park brake warning switch (left side of i/p)
• Pnk
• Radio
• Run
• S103
• S107
• S108
• S157
• S211
• S213
• S215
• S221
• S315
• S317
• 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)
• Vehicle speed sensor buffer (behind right side of i/p)
• W/ dual fuel tanks
• W/o dual fuel tanks

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram, Regular Cab/Extended Cab for GMC Pickup C1997 3500

List of elements for Courtesy Lamps Wiring Diagram, Regular Cab/Extended Cab for GMC Pickup C1997 3500:

• (crossbody harn, approx 41 cm from left door harn breakout)
• (i/p harn, arrrox 8 cm in crossbody harn breakout) s208
• (not used)
• Bat
• C210
• C219
• C220
• Cargo lamp
• Conven- ience center (left side of i/p)
• Convenience center (left side of i/p)
• Courtesy lamps
• Ctrl
• Ctsy fuse 3 20a
• Dome defeat
• Dome lamp defeat
• Door jamb
• Front dome lamp
• G120 (diesel) (right top of cylinder head)
• G120 (gasoline) (right front of engine block
• G202 (left side of i/p)
• Gages fuse 4 10a
• Gnd
• Headlamp and panel dimmer switch
• Horn mini 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 i/p)
• Lamp out
• Left front door jamb switch
• Left i/p courtesy lamp
• Left illuminated vanity mirror
• Mirrors system
• Pnk
• Pnk a
• Pnk j
• Rear door speaker breakout)
• Remote control door lock receiver (under center of i/p)
• 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 12 cm in crossbody harn breakout)
• S213
• S218
• S242
• 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 Pickup C1997 3500

List of elements for Instrument Illumination Wiring Diagram (1 of 2) for GMC Pickup C1997 3500:

• (6) bulbs
• (at right "b" pillar)
• (cross- body harn, near i/p harn breakout) s253
• (left side of i/p)
• Audio alarm module (left side of i/p)
• C210
• Cargo lamp switch
• Convenience center (left side of i/p)
• Display dim sig
• Fog lamp switch
• Front auxiliary a/c-heater control module
• G120 (diesel) (right top of cylinder head)
• G131 (gas) (near thermostat housing)
• G202
• G305
• Headlamp and panel dimmer switch
• Heater and a/c control
• Hot at all times
• I/p fuse block
• I/p fuse block (left side of i/p)
• Illum fuse 14 10a
• Inflatable restaint i/p module enable switch
• Instrument cluster
• Off
• Parade mode sw
• Park
• Park lps fuse 9 20a
• Pickup/ extended cab only
• Radio
• Rear auxiliary a/c-heater control module
• Rear auxiliary heater switch
• Rear liftgate release switch
• Rear window wiper/ washer switch
• Rheo- stat
• S204
• S215
• S216 (i/p harn, near i/p cluster breakout)
• S217 (i/p harn, near i/p cluster breakout)
• S218
• S259
• S307
• Suburban & utility only
• Transfer case mode selector illuminator lamp
• Transfer case select switch

Instrument Illumination Wiring Diagram (2 of 2) for GMC Pickup C1997 3500

List of elements for Instrument Illumination Wiring Diagram (2 of 2) for GMC Pickup C1997 3500:

• (crossbody harn, approx 6 cm in left door harn breakout)
• (left side of i/p)
• Ash tray lamp
• C210
• Convenience center (left side of i/p)
• Exterior lights system
• G202
• Headlamp and panel dimmer switch
• Hot at all times
• I/p fuse block
• Left front power window switch
• Left rear power window switch
• Off
• Parade mode sw
• Park
• Park lps fuse 9 20a
• Rear window lockout switch
• Remote outside rearview mirror switch
• Rheo- stat
• Right front power window switch
• Right rear power window switch
• S204
• S210 (i/p harn, approx 12 cm from steering column harn breakout)
• S218
• S247
• S251
• S259
• S500
• S502 (left front door harn, near tweeter)

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 4) for GMC Pickup C1997 3500

List of elements for Power Distribution Wiring Diagram (1 of 4) for GMC Pickup C1997 3500:

• (diesel)
• (diesel-engine harness, approx 5 cm from break- out to glow plug relay, gasoline-engine harness, approx 11 cm into under- hood fuse-relay center breakout)
• (engine harness, 4-13 cm from fuse-relay center breakout)
• (engine harness, approx 18 cm into underhood fuse-relay center break- out) s113
• (except diesel)
• (gasoline)
• (i/p harness, approx 5 cm from dlc harness breakout) s205
• (rear heat and a/c harness, 11-23 cm from blower motor relays breakout) s401
• (stud a)
• (stud b)
• (vanity mirror jumper harness, approx 4 cm from inside rearview mirror)
• A/c comp mini fuse 20a
• A/c maxi fuse 3 50a
• A/c relay
• Aux fan relay mini fuse 20a
• Auxiliary cooling fan relay
• Blower relay
• Brake lamp relay
• C13
• C205
• C219
• Cargo lamp switch (pick-up only)
• Convenience center
• Ctsy fuse 3 20a
• D13
• Daytime running lamps relay
• Diesel
• Diode
• Drl/fog fuse 15 20a
• Ecm-b mini fuse 20a
• Electronic brake control module
• Fog lamp relay
• Front dome reading lamps
• Fuel pump oil pressure switch and sender
• Fuel pump relay
• Fusible link (10 ga-rust)
• Gas
• Generator
• Headlamp and panel dimmer switch
• Heater and a/c control switch
• High blower relay
• Horn mini fuse 20a
• Horn relay
• I/p compartment lamp
• I/p fuse block
• Interior lamp control module
• Left battery (diesel)
• Left courtesy lamp
• Left front door courtesy lamp
• Left illuminated vanity mirror
• Left rear door courtesy lamp
• Low blower relay
• Maxi fuse 2 30a
• Maxi fuse 30a
• Maxi fuse 4 60a
• Maxi fuse 8 50a
• Medium blower relay
• Pk lps fuse 9 20a
• Powertrain control module (diesel)
• Rear dome reading lamps
• Red
• Remote battery stud
• Remote outside rearview mirror switch
• Right battery
• Right courtesy lamp
• Right front door courtesy lamp
• Right illuminated vanity mirror
• Right rear door courtesy lamp
• Rr defog mini fuse 20a
• S101
• S110 red
• S242 (i/p harness, approx 12 cm from radio harness breakout)
• S248 (crossbody harness, approx 35 cm from rear speaker breakout)
• S312
• Spare power source
• Starter motor solenoid
• To fusible link (diagram 4 of 4)
• To underhood fuse-relay center (diagram 2 of 4)
• Underhood fuse- relay center
• Underhood fuse-relay center
• Underhood lamp
• Underhood reel lamp
• Vehicle control module (gasoline)

Power Distribution Wiring Diagram (2 of 4) for GMC Pickup C1997 3500

List of elements for Power Distribution Wiring Diagram (2 of 4) for GMC Pickup C1997 3500:

• (crossbody harness, approx 11 cm from convenience center connector breakout) s255
• (crossbody harness, approx 8 cm right of i/p cluster
• (i/p harness, approx 12 cm into steering column harness breakout)
• (i/p harness, approx 4 cm from i/p cluster breakout)
• (i/p harness, approx 4 cm into auxiliary power outlet)
• (i/p harness, approx 4 cm into transfer case control module breakout)
• (i/p harness, approx 8 cm from dlc breakout) s200
• (inside left front door harness, near tweeter)
• (pickup-crossbody harness, approx 9 cm from i/p cluster breakout, crewcab-cross- body harness, approx 1 cm from door lock relay breakout, others-crossbody harness, approx 6 cm from door lock relay breakout)
• (pickup-front to rear body harness, approx 6 cm from front dome lamp harness breakout, suburban w/ rear a/c-front to rear body harness, approx 55 cm from rear dome lamp harness breakout, suburban w/o rear a/c-front to rear body harness, approx 25 cm into crossbody harness breakout)
• (power lumbar seat jumper harness, approx 13 cm from right power seat breakout)
• A/t
• Acc
• Audio alarm 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
• D14
• D15
• Data link connector
• Door lock control module
• Door lock relay
• From underhood a fuse-relay center (diagram 1 of 4)
• G202 (left side of i/p)
• Harness breakout)
• I/p fuse block
• Ignition switch
• Instrument cluster
• Left front door lock switch
• Left front power lumbar seat switch
• Left power seat
• Lock
• M/t
• Maxi fuse 5 50a
• Maxi fuse 6 40a
• Maxi fuse 7 50a
• Nca
• Off
• Park/neutral position switch
• Pickup
• Pnk
• Power amplifier relay
• Power wdo circuit breaker 30a
• Power window master switch
• Pwr-accy circuit breaker 20a
• Radio
• Radio batt fuse 19 10a
• Radio fuse 17 10a
• Rear door lock switch
• Rear liftgate release 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)
• Rr wiper fuse 23 25a
• Run
• S201
• S218
• S256
• S264
• S266
• S270
• S299
• S300
• S434
• Start
• Starter relay
• Stop/haz fuse 1 20a
• Suburban only
• Suburban/ utility
• T case fuse 2 20a
• Tcc/stoplamp switch
• To i/p fuse block (diagram 4 of 4)
• To security/ strg fuse 21 (diagram 4 of 4)
• To underhood fuse-relay center (diagram 3 of 4)
• Trans fuse 20 10a
• Trans- mission
• Transfer case control module
• Turn/ hazard switch
• Underhood fuse-relay center
• W/bench seat
• W/o bench seat
• Windshield wiper motor module
• Windshield wiper/ washer switch
• Wiper fuse 11 25a

Power Distribution Wiring Diagram (3 of 4) for GMC Pickup C1997 3500

List of elements for Power Distribution Wiring Diagram (3 of 4) for GMC Pickup C1997 3500:

• (a/t)
• (engine harness, approx 11 cm into fuse-relay center breakout) pnk
• (engine harness, approx 11-13 cm from ignition coil breakout)
• (engine harness, approx 22 cm into underhood fuse- relay center breakout)
• (engine harness, approx 29 cm from fuse-relay center breakout)
• (engine harness, approx 30 cm from egr harness breakout)
• (engine harness, approx 5 cm from backup lamp switch harness breakout)
• (engine harness, approx 7 cm from egr breakout)
• (engine harness, approx 8 cm into breakout to fuel injector connector)
• (i/p harness, approx 10 cm from tcc/ stoplamp switch connector breakout) pnk
• (i/p harness, approx 13 cm from dlc harness breakout)
• (in injector harness jumper)
• (m/t)
• (oxygen sensor jumper harness, approx 17 cm into harness)
• (taillamp extension harness, approx 65 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
• Air bag fuse 10 10a
• Air injection reaction secondary relay
• Audio alarm module
• B pnk
• Backup lamp switch
• C pnk
• C11
• C12
• C218
• Camshaft position sensor
• Convenience center
• Crank- shaft position sensor
• Daytime running lamps module
• Daytime running lamps relay
• Diesel
• Diesel only
• Ecm 1 mini fuse 20a
• Egr solenoid
• Egr vent solenoid
• Electrochromatic mirror w/ compass
• Electronic injection pump
• Eng-1 mini fuse 20a
• Evaporative emission canister vent
• Evaporative emissions canister purge solenoid valve
• Exhaust gas recirculation valve
• From ignition switch (diagram 2 of 4)
• Fuel heater
• Fuel injector
• Fuel pump balance module
• Fuel pump balance relay
• Fuel sol mini fuse 20a
• Fuel tank sender module (4.3l)
• Gasoline
• Gauges fuse 4 10a
• Glow plug control module
• Headlamp/ panel dimmer switch
• Heated oxygen sensor 1
• Heated oxygen sensor 2
• Heated oxygen sensor 3
• Heated oxygen sensor 4
• I/p cluster
• I/p fuse block
• Ign e mini fuse 10a
• Ignition coil
• Ignition control module
• Inflatable restraint i/p module enable switch
• Inflatable restraint sensing and diagnostic module
• 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
• Nca
• Nca
• Others
• Pnk
• Pnk s104
• Pnk s154
• Pnk s207
• Power steering control module
• Powertrain control module
• S104
• S108
• S109
• S146
• S148
• S155 pnk
• S161
• S213 pnk
• S315
• Transfer case control module
• 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)
• Wastegate solenoid
• Water-in- fuel sensor

Power Distribution Wiring Diagram (4 of 4) for GMC Pickup C1997 3500

List of elements for Power Distribution Wiring Diagram (4 of 4) for GMC Pickup C1997 3500:

• (engine harness, approx 6 cm into ebcm breakout)
• (hvac harness, approx 4 cm from recirculation door breakout) s243
• (i/p harness, approx 29 cm from tcc/stoplamp switch)
• (i/p harness, approx 4 cm from steering column breakout)
• (i/p harness, approx 6 cm into heater a/c control connector breakout)
• (rear a/c-rear a/c harness, approx 17 cm from blower motor relays, rear heat and a/c-rear heat and a/c harness, approx 4 cm from blower motor relays)
• (rear hvac control harness, approx 5 cm from hvac logic module breakout) s308
• 4wd fuse 24 25a
• A13
• 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)
• Brake fuse 18 10a
• C205
• Convenience center
• Cruise control module
• Cruise control switch
• Cruise fuse 6 10a
• Diesel
• Electronic brake control module
• Except diesel
• From ignition switch (diagram 2 of 4)
• From stop/haz fuse 1 (diagram 2 of 4)
• From underhood fuse-relay center (diagram 1 of 4)
• Front mode door motor
• Front temperature door motor
• Fusible link
• G100 (left front fender)
• Heater and a/c control module
• Heater and a/c control switch
• Htr-a/c fuse 12 25a
• I/p fuse block
• Illum fuse 14 10a
• Interior lights system
• Interior lights system (headlamp and panel lamp dimmer)
• Power steering control module
• Rear auxiliary mode door motor
• Rear auxiliary temperature door motor
• Rear high blower relay
• Rear low blower relay
• Rear medium blower relay
• Recirculation door motor
• Rr hvac fuse 5 20a
• S151
• S206
• S235
• S268
• S400
• Security/ strg fuse 21 10a
• Spare power source
• Tcc/ stoplamp switch
• Transfer case select switch
• Vehicle control module

POWER DOOR LOCKS

Door Lock Wiring Diagram, without Crew Cab for GMC Pickup C1997 3500

List of elements for Door Lock Wiring Diagram, without Crew Cab for GMC Pickup C1997 3500:

• (inside right door harness) s601
• (w/ pwr wdo) (w/o pwr wdo)
• (w/ pwr windows) (w/o pwr windows)
• A a
• B e
• C d
• Convenience center (under left side of dash)
• E h
• 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 acc c.b. 20a
• Right front door lock actuator
• Right front door lock switch
• S204
• S255
• S500
• S600 (inside right door harness)
• Solid state
• Tan
• Unlock

Keyless Entry Wiring Diagram, without Crew Cab for GMC Pickup C1997 3500

List of elements for Keyless Entry Wiring Diagram, without Crew Cab for GMC Pickup C1997 3500:

• (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
• G202 (left end of i/p, near fuse block)
• Gauges fuse 4 10a
• Ground
• 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. 30a
• 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)
• Tan
• Unlock
• Unlock out
• W/ power windows
• W/o power windows

POWER MIRRORS

Power Mirror Wiring Diagram for GMC Pickup C1997 3500

List of elements for Power Mirror Wiring Diagram for GMC Pickup C1997 3500:

• (inside left front door harness)
• (inside right front door harness)
• Convenience center (behind left side of i/p)
• Ctsy fuse 3 20a
• Down
• G202 (behind left side of i/p)
• Hot at all times
• I/p fuse block
• Illum- nation lamp
• Interior lights system
• Left
• Left outside power rearview mirror
• Left/ right motor
• Power outside rearview mirror switch
• Red
• Right
• Right outside power rearview mirror
• S204
• S248
• S251
• S503
• S602
• Up/ down motor

POWER SEATS

6-Way Power Seat Wiring Diagram for GMC Pickup C1997 3500

List of elements for 6-Way Power Seat Wiring Diagram for GMC Pickup C1997 3500:

• (behind left side of i/p)
• (crossbody harn, approx 12.5 cm right of left door harn breakout, toward i/p harn breakout)
• (power lumbar seat jumper, approx 20 cm from right power seat breakout)
• (w/ reg/extended cab) (except reg/extended cab)
• Back
• C210
• Convenience center (under left side of i/p)
• Down
• Entire seat
• For- ward
• Forward/ rearward motor
• Front height
• Front tilt motor
• G202
• Hot at all times
• I/p fuse block (left side of i/p)
• Lumbar support circuit
• Power seat switch
• Pwr accy circuit breaker 20a 30a
• Rear height
• Rear tilt motor
• S204
• S251
• S255 (crossbody harn, approx 11.5 cm from convenience center breakout)
• Tan

Lumbar Wiring Diagram, Bench Seat for GMC Pickup C1997 3500

List of elements for Lumbar Wiring Diagram, Bench Seat for GMC Pickup C1997 3500:

• (crossbody harn, approx 6 cm from door lock relay breakout)
• (front to rear body harn, approx 6 cm from left kick panel breakout)
• (power lumbar seat jumper harn, approx 13.5 cm from right power seat breakout)
• C210 b
• Cig ltr fuse 13 20a
• Convenience center (under left side of i/p)
• G202 (behind left side of i/p)
• Hot at all times
• I/p fuse block (lower left side of i/p)
• Left power lumbar support switch
• Pnk
• Power lumbar motor
• Right power lumbar support switch
• S204
• S251
• S256
• S264 (suburban utility only)
• S300
• S310 (suburban)

Lumbar Wiring Diagram, Bucket And Split Bench Seat for GMC Pickup C1997 3500

List of elements for Lumbar Wiring Diagram, Bucket And Split Bench Seat for GMC Pickup C1997 3500:

• (crossbody harn, approx 6 cm from door lock relay breakout)
• 6-way power seat circuit
• Cig ltr fuse 13 20a
• Convenience center (under left side of i/p)
• G202 (behind left side of i/p)
• Hot at all times
• I/p fuse block (lower left side of i/p)
• Left power lumbar support motor
• Left power lumbar support switch
• Pnk
• Right power lumbar support motor
• Right power lumbar support switch
• S204
• S251
• S259
• S264 (suburban utility only)
• S303

POWER WINDOWS

Power Window Wiring Diagram, 2 Door for GMC Pickup C1997 3500

List of elements for Power Window Wiring Diagram, 2 Door for GMC Pickup C1997 3500:

• Convenience center (under left side of i/p)
• Down
• G202 (below left side of i/p)
• Hot in run
• I/p fuse block (lower left side of i/p)
• Interior lights system
• Left front
• Left front window motor
• Left power window master switch
• Pwr wdo circuit breaker 30a
• Right front
• Right front window motor
• Right front window switch
• S204
• S251
• S259
• S266
• S500
• S501
• Solid state
• Tan

Power Window Wiring Diagram, 4 Door for GMC Pickup C1997 3500

List of elements for Power Window Wiring Diagram, 4 Door for GMC Pickup C1997 3500:

• (crossbody harn, approx 25cm from seat belt sw breakout toward i/p harn breakout)
• Convenience center (under left side of i/p)
• Down
• Fuse block (lower left side of i/p)
• G202 (below left side of i/p)
• 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
• Pwr wdo circuit breaker 30a
• Right front
• Right front window motor
• Right front window switch
• Right rear
• Right rear window motor
• Right rear window switch
• S204
• S247 (crossbody harn, approx 6cm into left door harn breakout)
• S251
• S263
• S500
• S501
• S502 (left front door harn, near tweeter)
• Solid state
• Tan
• Window lockout switch

RADIO

Radio Wiring Diagrams, with Amplifier for GMC Pickup C1997 3500

List of elements for Radio Wiring Diagrams, with Amplifier for GMC Pickup C1997 3500:

• (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 Pickup C1997 3500

List of elements for Radio Wiring Diagrams, without Amplifier for GMC Pickup C1997 3500:

• (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 Pickup C1997 3500

List of elements for Shift Interlock Wiring Diagram for GMC Pickup C1997 3500:

• 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 Pickup C1997 3500

List of elements for Charging Wiring Diagram for GMC Pickup C1997 3500:

• (diesel)
• (gas)
• (gas-left front of engine, diesel-left front of intake manifold)
• (gasoline)
• (left front of intake manifold)
• (not used)
• (not used) s
• (right front wheelhouse)
• Charge indicator
• Diesel only
• Fusible link (10 ga-rust)
• G101
• G110
• G119 (gas) g110 (diesel)
• G133
• Gauges fuse 4 10a
• Generator
• Hot in run, or start
• I/p fuse block
• Instrument cluster
• Left battery (diesel)
• Pnk
• Power distribution system
• Red
• Right battery
• S213
• Starting circuit
• Tach

Starting Wiring Diagram for GMC Pickup C1997 3500

List of elements for Starting Wiring Diagram for GMC Pickup C1997 3500:

• (gas-left front of eng., diesel-left front of intake manifold)
• (left front of intake manifold)
• (right front of engine-gas, rear of right cylinder head-diesel)
• (right front wheelhouse)
• A/t
• Accy
• Battery stud
• Bulb test
• Charging circuit
• Clutch pedal position switch (top of clutch pedal)
• Crank fuse 8 10a
• Diesel
• G101
• G110
• G119 (gas) g110 (diesel)
• G120 (gas) g117 (diesel)
• Gas
• Hold- in coil
• I/p fuse block
• Ignition switch
• Left battery (diesel)
• Lock
• M/t
• Maxi fuse 6 40a
• 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 Pickup C1997 3500

List of elements for Supplemental Restraint Wiring Diagram for GMC Pickup C1997 3500:

• Air bag fuse 10 10a
• Air bag warning indicator
• B nca
• Bar
• Cluster
• Data line
• Data link connector (under left side of i/p)
• Driver high
• Driver low
• Front end discriminating sensor (front center of engine compt)
• G202 (left side of i/p)
• Gauges fuse 10a
• Ground
• Hot in park or headlamp
• Hot in run, bulb test or start
• I/p fuse block
• Ign 1
• Illum fuse 14 10a
• Indicator lamp
• Inflatable restraint i/p module enable switch (center of i/p)
• Inflatable restraint sensing and diagnostic module (below right seat)
• Inflatable restraint steering wheel module
• Instrument
• Interior lights (dimmer swtch)
• Nca
• Pass disable
• Pass enable
• Pass high
• Pass low
• Passenger inflator module (right i/p)
• Pnk
• S213 (i/p harn, near breakout to datalink conn)
• S217 (i/p harn, near breakout to radio harn)
• S218 (i/p harn, near breakout to radio harn) g202 (behind left side of i/p)
• Seat belt sig
• Sensor feed
• Shorting
• Shorting bar
• Sir coil assembly
• Solid state
• Tan
• Warning systems (seat belt switch)

TRANSMISSION

4.3L

4.3L (VIN W), Transmission Wiring Diagram, 4L60-E for GMC Pickup C1997 3500

List of elements for 4.3L (VIN W), Transmission Wiring Diagram, 4L60-E for GMC Pickup C1997 3500:

• (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

5.0L

5.0L (VIN M), Transmission Wiring Diagram, 4L60-E for GMC Pickup C1997 3500

List of elements for 5.0L (VIN M), Transmission Wiring Diagram, 4L60-E for GMC Pickup C1997 3500:

• (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 Pickup C1997 3500

List of elements for 5.7L (VIN R), Transmission Wiring Diagram, 4L60-E for GMC Pickup C1997 3500:

• (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

WARNING SYSTEMS

Warning System Wiring Diagrams for GMC Pickup C1997 3500

List of elements for Warning System Wiring Diagrams for GMC Pickup C1997 3500:

• Audio alarm module (in convenience center)
• Battery input
• C210
• Convenience center (under left side of i/p)
• Diesel
• Ex diesel
• Fasten belts out
• G120 (right top of cylinder head)
• G134 (front top of engine)
• G202 (behind left side of i/p)
• Gauges fuse 4 10a
• Ground
• Hot at all times
• Hot in park or head
• Hot in run, bulb test or start
• I/p fuse block
• Ign on
• Illum fuse 14 10a
• Instru- ment cluster
• Interior lights system
• Key-in warning
• Key-in warning buzzer switch (left side of steering column)
• Left door jamb switch
• Lights on input
• Pnk
• S204
• S213
• S215
• S217 (i/p harn, approx 5 cm from headlamp switch breakout)
• 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 Pickup C1997 3500

List of elements for Front Wiper/Washer Wiring Diagram for GMC Pickup C1997 3500:

• 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