All Wiring Diagrams for GMC Cab & Chassis Sierra 2001 3500

AIR CONDITIONING

Compressor Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Compressor Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• 4.3l
• A/c compressor clutch
• A/c compressor clutch relay
• A/c fuse 10a
• A/c high pressure cutout switch (on a/c compressor)
• A/c high pressure recirculating switch (in a/c muffler hose)
• A/c low pressure cycling switch (on a/c compressor)
• A/c request
• A/c switch
• All others
• G100 (on left radiator support bracket)
• G110 (4.8l, 5.3l, 6.0l) (left front of engine)
• G119 (4.3l) (right front of engine)
• Hot at all times
• Hot in run or start
• Hvac control module
• Ign e fuse 10a
• Powertrain control module (pcm) (left front of engine compt)
• Press switch a/c high
• Relay ctrl a/c comp
• S101 (forward lamp harn)
• S102 (engine harn)
• Underhood junction block (left side of engine compt, near battery)

Heater Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Heater Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• Blower motor
• Blower motor relay
• Blower motor resistor assembly (on hvac module, near blower motor)
• Blower motor switch
• D12
• Frt hvac fuse 30a
• Fuse block (lower left side of dash)
• G203 (right side of dash, at "a" pillar)
• Hot at all times
• Hot in run
• Htr-a/c fuse 25a
• Interior lights system
• Off
• Tan
• Underhood junction block (left side of engine compt, near battery)

Manual A/C Wiring Diagram, Base for GMC Cab & Chassis Sierra 2001 3500

List of elements for Manual A/C Wiring Diagram, Base for GMC Cab & Chassis Sierra 2001 3500:

• 4.3l
• A a/c disable
• A/c comp relay ctrl
• A/c compressor clutch
• A/c compressor clutch relay
• A/c fuse 10a
• A/c high pressure cutout switch (on a/c compressor)
• A/c high pressure recirculating switch (in a/c muffler hose)
• A/c low pressure switch (right side of accumulator)
• A/c request
• A/c switch
• Air temperature actuator (bottom center of hvac module)
• All others
• B mode signal
• Blower motor (under right side of dash)
• Blower motor resistor/relay assembly (on hvac module, near blower motor)
• Blower relay
• Body junctioin block
• C ground
• D recirc signal
• D12
• Defogger system
• E illumination
• F temp signal
• Frt hvac fuse 30a
• Fuse block (lower left side of dash)
• G feedback
• G100 (on left radiator support bracket)
• G110 (4.8l, 5.3l, 6.0l) (left front of engine)
• G119 (4.3l) (right front of eng)
• G200 (on upper left dash at "a" pillar)
• G200 (right side of dash, at "a" pillar)
• H 5v reference
• High
• Hot at all times
• Hot in run
• Hot in run or start
• Htr-a/c fuse 25a
• Hvac 1 fuse 10a
• Hvac control module (under radio)
• Ign e fuse 10a
• Interior lights system
• J rear defog
• K ign power
• L a/c request
• Low
• M feedback
• Mode actuator (left side of hvac module)
• Off
• Powertrain control module (pcm) (left front of engine of engine compt)
• Press sw a/c high
• Recirculation actuator (top of hvac module)
• Red
• S101 (forward lamp harness)
• S102 (engine harn)
• Sp203
• Tan
• Underhood junctioin block (left side of engine compt, near battery)

Manual A/C Wiring Diagram, Up Level for GMC Cab & Chassis Sierra 2001 3500

List of elements for Manual A/C Wiring Diagram, Up Level for GMC Cab & Chassis Sierra 2001 3500:

• 4.3l
• A a/c disable
• A/c compressor clutch
• A/c compressor clutch relay
• A/c fuse 10a
• A/c high press sw
• A/c high pressure cutout switch (on a/c compressor)
• A/c high pressure recirculating switch (in a/c muffler hose)
• A/c request
• A/c switch
• Air temperature actuator (bottom center of hvac module)
• All others
• B mode signal
• Blower motor (under right side of dash)
• Blower motor resistor assembly (on hvac module, near blower motor)
• Blower relay
• C ground
• C3 c3
• D recirc signal
• D12
• Defogger system
• E illumination
• F temp signal
• Frt hvac fuse 30a
• Fuse block (lower left side of dash)
• G feedback
• G100 (on left radiator support bracket)
• G110 (4.8l, 5.3l, 6.0l) (left front of engine)
• G119 (4.3l) (right front of eng)
• G203 (right side dash, at "a" pillar)
• H 5v reference
• Hot at all times
• Hot in run
• Hot in run or start
• Htr-a/c fuse 25a
• Hvac 1 fuse 10a
• Hvac control module (under radio)
• I/p junction block (lower right side of dash)
• Ign e fuse 10a
• Interior lights system
• J rear defog
• K ign power
• L a/c request
• M feedback
• Mode actuator (left side of hvac module)
• Off
• Powertrain control module (pcm) (left side of engine compt)
• Recirculation actuator (top of hvac module)
• Red
• Relay ctrl a/c comp
• S101 (forward lamp harness)
• S102 (engine harn)
• Tan
• Underhood junctioin block (left side of engine compt, near battery)

ANTI-LOCK BRAKES

Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis Sierra 2001 3500

List of elements for Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis Sierra 2001 3500:

• (dlc) (below steering column)
• (engine harn, 20 cm into ebcm breakout)
• Abs fuse 60a
• Abs ind
• Abs ind failure cntl
• Abs serial data
• Axle sw signal
• Battery
• Brake fuse 18 10a
• Brake pres diff sw signal
• Brake pressure differential switch
• Brake warning ind
• Class 2 serial data
• Cruise control system
• Data link connector
• Diesel
• Drl module (under left side of dash)
• Electronic brake control module (ebcm) (on left side of inner frame)
• Engine controls system
• Engine wiring harness junction block (at left side of engine compt, near battery)
• Fuse block (on lower left side of dash)
• G117 (rear of right cyl head)
• G132 (back of engine block, below left cyl head)
• Gas
• Gauges fuse 4 10a
• Ground
• Hot at all times
• Hot in run
• Hot in run or start
• Ignition 3
• Instrument cluster
• Left front wheel speed sensor
• Lf whl sp sens low ref
• Lf whl spd sens signal
• Parking brake switch (part of park brake assembly)
• Pnk
• Powertrain control module (pcm) (on left front of engine compt)
• Red
• Rf whl sp sens low ref
• Rf whl spd sens signal
• Right front wheel speed sensor
• S107
• S150 (13 cm into ebcm breakout from engine harness)
• S152 (engine harn, 16.5 cm from evap purge valve breakout)
• S157
• S213
• S224 (cluster connector breakout, 12 cm from inflatable ip harness)
• S229 (w/a/t) (engine harn, near pcm)
• S229 (w/m/t) (i/p harn, near radio)
• Stoplight switch (on top of brake pedal bracket)
• Tan
• Tcc brake sw signal
• Transmissions system
• Vehicle speed sensor (vss) (on left side of transfer case)
• Vehicle speed sensor buffer
• Vehicle speed signal
• W/ drl
• W/o drl

ANTI-THEFT

Forced Entry Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Forced Entry Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (left side of dash, below steering column)
• A11
• All times
• Body control module
• Cargo door key switch
• Door unlock
• Driver mini-wedge door jamb switch
• Driver window/door lock switch
• Ex lights ctrl
• Exterior lights system
• F10
• Front passenger mini-wedge door jamb switch
• Front passenger window/door lock switch
• G200 (upper left kick panel)
• G203 (upper right kick panel)
• G998 (rear corner or right rear window)
• Grd
• Headlights ctrl
• Headlights system
• Horn rly ctrl
• Horns system
• Hot at
• I/p junction block (lower right side of dash)
• Lift gate key switch
• Remote keyless entry system
• Right door contactor
• Sp203
• Sp410
• Tbc fuse 10a
• Underhood junction block
• W/ cargo doors
• W/o cargo doors

Passlock Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Passlock Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• A12
• Battery
• Body control module (lower left side of dash below steering column)
• Body junction block (near left kick panel)
• Connector (below steering column)
• Cruise fuse 10a
• Data
• Data link
• F10
• Fuse block
• G200 (upper left kick panel)
• Grd
• Hot at all times
• Hot in run
• Ign 1 fuse 10a
• Ign pwr
• Key
• Lock cylinder
• Magnet
• Passlock sensor (internal to steering column)
• Pnk
• Powertrain control module (on left front of engine compt)
• Security sensor
• Sensor data
• Sensor pwr
• Sensor ret
• Sp203
• Sp203 (upper left kick panel)
• Steering handwheel speed/ position sensor (base of steering column)
• Tamper sensor
• Tbc fuse 10a
• Underhood junction block
• W/o rear time damping only

BODY COMPUTER

Body Computer Wiring Diagrams for GMC Cab & Chassis Sierra 2001 3500

List of elements for Body Computer Wiring Diagrams for GMC Cab & Chassis Sierra 2001 3500:

• 12v ref
• 54 (54 or 394)
• 5v ref
• A10
• A11
• A12
• Acc relay
• Ambient light sensor (top center of dash)
• Anti-theft system
• B10
• B11
• B12
• Battery
• Body control module (on lower left side of dash, below steering column)
• Body junction block
• Body wiring harness junction block
• Cargo lp
• Class 2 data
• Computer data lines system
• Cruise fuse 10a
• Ctsy lp
• Ctsy lp rly
• Door latch
• Door locks system
• Door sw
• Dr unlk rly
• Drl rly coil
• Electronic power steering system
• Engine controls system
• Evo hi
• Evo lo
• Exterior lights system
• F10
• Fog lp rly
• Fog lp sw
• Ftp sw
• Fuse block
• G200 (upper left kick panel)
• Ground
• Headlamp rly
• Headlights system
• Headlp dim
• Horn rly out
• Horns system
• Hot at all times
• Hot in run
• Hot in run & start
• Ign 1 feed
• Ign 1 fuse 10a
• Ign 3 input
• Ignition key alarm switch
• Inadv pwr
• Inst panel lp
• Int lp sw
• Interior lights system
• Key cyl sw
• Key reminder
• Lamp relay
• Led dim
• Lf dr sw
• Liftgate ajar
• Lock coil
• Lp rly coil
• Lt turn input
• Nca
• Park brake switch
• Passlock sig
• Photocell
• Pk lp rly
• Pk lps feed
• Pnk
• Power distribution system
• Power distribution system (rap)
• Prk bk sw
• Rear parking assist chime module
• Rfa link
• Rt turn input
• Seat belt sw
• Sensor rtn
• Serial data
• Sp203
• Tan
• Tbc fuse 10a
• Tow/haul sw
• Tow/haul switch
• Underhood junction block
• Unlock coil
• Vss
• Warning system
• Warnings system
• Wheel pos

COMPUTER DATA LINES

Computer Data Lines for GMC Cab & Chassis Sierra 2001 3500

List of elements for Computer Data Lines for GMC Cab & Chassis Sierra 2001 3500:

• (under driver's seat) inflatable restraint sensing & diagnostic module
• A12
• Allison transmission
• Body control module (on lower left side of dash, below steering column)
• Body junc- tion block (under left side of dash)
• Body junction block (under left side of dash)
• C11
• Cellular phone ready wiring
• Cigar fuse 15a
• Data link connector (dlc) (under left side of dash, below steering column)
• Driver information center (dic) (in lower console)
• Electronic brake control module (ebcm) (on left side of the inner frame)
• G117 (right rear of of engine)
• G200 (upper left kick panel)
• Hot at all times
• Hvac control module (in center of dash, under radio)
• Instrument panel cluster (ipc)
• Memory mirror module
• Memory seat module (under driver seat)
• Powertrain control module (pcm) (left front of engine compt)
• Sp205 (left side of dash)
• Splice pack sp203
• Suspension control module (rear of right rear wheelwell)
• Transfer case shift control module (left side of dash, above headlight switch)
• Under- hood junction block (at left side of engine compt)
• Underhood junction block (at left side of engine compt, near battery)

CRUISE CONTROL

6.0L

6.0L VIN U, Cruise Control Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.0L VIN U, Cruise Control Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (36 series only)
• (power take off)
• 5 volt ref
• A12
• A13
• A14
• A15
• Accelerator pedal position sensor (above accelerator pedal)
• Act cntrl
• App sens
• App sens 1
• App sens 2
• App sens 3
• App sense
• C1 d11
• C2 a10
• Clutch pedal position switch (top of clutch pedal)
• Clutch sw input
• Cruise control on/off switch
• Cruise fuse 10a
• Cruise req
• Ect fuse 15a
• Engine compt)
• Engine controls system
• F12
• Fuse block (on lower left side of dash)
• G117 (right rear of engine)
• Ground
• Hot at all times
• Hot in run & start
• Ign
• Nca
• Off
• Pnk
• Powertrain control module (left front of engine compt)
• R/a input
• Resume/accel
• S/c input
• S103
• Sens 1 grd
• Sens 1 rt
• Sens 2 grd
• Sens 2 rt
• Sens 3 grd
• Sens 3 rt
• Serial data
• Set/coast
• Stop lps fuse 20a
• Stoplamp switch (on top of brake pedal bracket)
• Stp lp in
• Tan
• Throttle actuator control (tac) module (near front of engine compt)
• Throttle actuator control motor (near front of
• Throttle position sensor (near front of engine compartment)
• Tp sens 1
• Tp sens 2
• Underhood junction block (left side of engine compt, near battery)
• Veh stop fuse 10a
• Vehicle speed sensor (vss) (2wd: left rear side of transmission) (4wd: left rear side of transfer case)
• Vehicle speed sensor adapter (4wd) (on left side of transmission)
• Vss high
• Vss low

6.6L

6.6L VIN 1, Cruise Control Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Cruise Control Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• A12
• A13
• A14
• A15
• Body junction block (near left kick panel)
• Brake fuse 10a
• C1 c1
• C1 f12
• Clutch pedal position switch (on top of clutch pedal bracket)
• Clutch sw sig
• Cruise control on/off switch
• Cruise fuse 10a
• Cruise on input
• D11
• Engine control module (ecm) (left front of engine compt)
• Engine controls system (power take off)
• F11 c1
• Fuse block (lower left side of dash)
• Hot at all times
• Hot in run
• Nca
• Off
• R/a
• Resume/accel sig
• S/c
• Set/coast sig
• Stop lps fuse 20a
• Stoplamp switch (top of brake pedal)
• Stoplamp switch input
• Underhood junction block (near battery)
• Veh stop fuse 10a
• Vehicle speed sensor (vss) (2wd) (left side of transmission) (4wd) (left side of transfer case)
• Vss high
• Vss low

8.1L

8.1L VIN G, Cruise Control Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for 8.1L VIN G, Cruise Control Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (36 series only)
• (power take off)
• 5 volt ref
• A12
• A13
• A14
• A15
• Accelerator pedal position sensor (above accelerator pedal)
• Act cntrl
• App sens
• App sens 1
• App sens 2
• App sens 3
• App sense
• C1 d11
• C2 a10
• Clutch pedal position switch (top of clutch pedal)
• Clutch sw input
• Cruise control on/off switch
• Cruise fuse 10a
• Cruise req
• Ect fuse 15a
• Engine compt)
• Engine controls system
• F12
• Fuse block (on lower left side of dash)
• G117 (right rear of engine)
• Ground
• Hot at all times
• Hot in run & start
• Ign
• Nca
• Off
• Pnk
• Powertrain control module (left front of engine compt)
• R/a input
• Resume/accel
• S/c input
• S103
• Sens 1 grd
• Sens 1 rt
• Sens 2 grd
• Sens 2 rt
• Sens 3 grd
• Sens 3 rt
• Serial data
• Set/coast
• Stop lps fuse 20a
• Stoplamp switch (on top of brake pedal bracket)
• Stp lp in
• Tan
• Throttle actuator control (tac) module (near front of engine compt)
• Throttle actuator control motor (near front of
• Throttle position sensor (near front of engine compartment)
• Tp sens 1
• Tp sens 2
• Underhood junction block (left side of engine compt, near battery)
• Veh stop fuse 10a
• Vehicle speed sensor (vss) (2wd: left rear side of transmission) (4wd: left rear side of transfer case)
• Vehicle speed sensor adapter (4wd) (on left side of transmission)
• Vss high
• Vss low

DEFOGGERS

Defogger Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Defogger Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (base)
• (right "b" pillar) g305
• (uplevel)
• (upper right kick panel) g203
• A c1
• A c2
• C c1
• D9 c1
• F3 c1
• Fuse block (on lower left side of dash)
• G200
• Ground
• Hot at all times
• Hot in run
• Hot in run & start
• Hvac 1 fuse 10a
• Hvac control module (in center of dash, under radio)
• Ign
• Ign fuse 10a
• Ind
• K c1
• Rear window defogger grid
• Rear window defogger relay
• Relay ctrl
• Rr defog fuse 30a
• Splice pack sp203 (upper left kick panel)
• Underhood junction block (at left side of engine compartment, near battery)

Heated Mirrors Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Heated Mirrors Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• Base
• Body junction block (under left side of dash, near kick panel)
• C c7
• C1 c
• C1 f2
• D2 c1
• D9 c1
• Defog request
• Defogger switch/ timer
• Driver outside rearview mirror
• Driver window/ door lock switch
• F c5
• F3 c1
• Fuse block (on lower left side of dash)
• G200 (upper left kick panel)
• G203 (upper right kick panel)
• Ground
• Ground distribution system
• Hot at all times
• Hot in run
• Hot in run & start
• Htd mir fuse 10a
• Hvac 1 fuse 10a
• Hvac control module (in center of dash, under radio)
• I/p junction block (on lower right side of dash)
• Ign 3
• Ign e fuse 10a
• Ind
• K c1
• M c1
• Nca
• Passenger outside rearview mirror
• Passenger window/ door lock switch
• Rear window defogger relay
• Relay ctrl
• Splice pack 203
• Underhood junction block (at left side of engine compartment, near battery)
• Uplevel

ELECTRONIC POWER STEERING

Electronic Power Steering Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Electronic Power Steering Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• 5 volt ref
• A12
• A4 c1
• Anti-theft system
• Battery
• Body control module (bcm) (on lower left side of dash, below steering column)
• Body wiring harness junction block (under left side of dash, near kick panel)
• Computer data lines system
• Cruise fuse 10a
• E9 c1
• Electronic variable orifice (evo) solenoid (on power steering pump fluid fittings)
• Engine wiring harness junction block (at left side of engine compt, near battery)
• Evo high
• Evo low
• F10 c1
• Fuse block (on lower left side of dash)
• G202 (upper left side of dash, at "a" pillar)
• Ground
• Hot at all times
• Hot in run
• Hot in run or start
• Ign 1 fuse 10a
• Ignition
• Pnk
• Return
• Serial data
• Signal
• Sp203
• Steering wheel speed/ position sensor (near base of steering column)
• Tbc fuse 10a

ENGINE PERFORMANCE

6.0L

6.0L VIN U, Engine Performance Wiring Diagrams (1 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (1 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• (below steering column) data link connector
• (lower right rear of engine) crankshaft position sensor
• +5v
• 3-2 ss
• Anti-lock brake system
• Body control module (below steering column)
• Brk sw
• C10
• C11
• C12
• Ckp
• Cls 2 data
• Clutch sw
• Cmp
• Coolant lev
• D10
• E12
• Ecm1 fuse 10a
• Ecmb fuse 20a
• Ect sig
• Egr input
• Electronic suspension system
• Fuse block
• G117 (right rear of engine)
• Gnd
• Ho2s hi
• Ho2s lo
• Hot at all times
• Hot in run & start
• Ign
• Ign 0 fuse 10a
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Inja fuse 15a
• Injb fuse 15a
• Injectors
• Ks signal
• Lift/dive sig
• Low ref
• O2b fuse 15a
• Oil lev
• Pnk
• Pnk b
• Powertrain control module (left front of engine compt)
• Prnd a
• Prnd b
• Prnd p
• Range b
• Range c
• Red
• Ref low
• Req torque
• S103
• Sens gnd
• Sens rtn
• Serial data
• Sp205 (behind headlamp switch)
• Tan
• Under- hood junction block

6.0L VIN U, Engine Performance Wiring Diagrams (2 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (2 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness)
• (left front of engine)
• (left rear of engine)
• (left rear of engine) g114
• (not used)
• Ecm b fuse 20a
• Engine coolant level switch (in coolant reservoir)
• Engine coolant temperature sensor (left front of cylinder head)
• Engine oil level switch (right side of oil pan)
• Fuel pump relay
• G104
• G110
• G117 (right rear of engine)
• G402 (left frame body mount bracket)
• Heated oxygen sensor (bank 1 sensor 1) (left exh pipe before converter)
• Heated oxygen sensor (bank 1 sensor 2) (left exh pipe after converter)
• Heated oxygen sensor (bank 2 sensor 1) (right exh pipe before converter)
• Heated oxygen sensor (bank 2 sensor 2) (right exh pipe after converter)
• Hot at all times
• Knock sensor 1 (under intake manifold)
• Knock sensor 2 (under intake manifold)
• Nca
• Park/neutral position switch (left side of transmission)
• Pnk
• Primary fuel pump/ level sensor (in fuel tank)
• Red
• S103
• S104
• S113
• S114a
• S115
• S116
• S312
• Secondary fuel pump relay
• Secondary fuel pump/ level sensor (in fuel tank)
• Tan
• Throttle position sensor (w/o electronic throttle control) (on throttle body assy)
• Under- hood junction block

6.0L VIN U, Engine Performance Wiring Diagrams (3 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (3 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• 1-2 sol
• 2-3 sol
• A/t fluid pressure manual valve position switch
• Automatic transaxle
• Body junction block
• Brake fuse 10a
• Camshaft position sensor (top center rear of engine)
• Clutch pedal position switch (top of pedal bracket)
• Evap canister purge valve (top right rear of engine)
• Evap canister vent valve (left front side of fuel tank)
• Exhaust gas recirculation valve (top right front of engine)
• F12
• Fuel tank pressure sensor (in fuel tank)
• Fuse block
• Hot in run
• Hot in run & start
• Manifold absolute pressure sensor (top rear of engine)
• N pnk
• P red
• Pc sol valve
• Pnk
• Pnk a
• Pnk b
• Red
• Red e
• Red/
• Rev
• Stop lps fuse 20a
• Stop- lamp switch (top of brake pedal bracket)
• Tan
• Tcc pwm sol
• Tft sensor
• Vehicle speed sensor (left rear of transmission)
• Vss adapter (4wd) (left side of trans)

6.0L VIN U, Engine Performance Wiring Diagrams (4 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (4 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• (right rear of engine compt) secondary air injection reaction solenoid
• A10
• Accelerator pedal position sensor (w/ electronic throttle control)
• Act cntrl
• Air maxi fuse 30a c7
• App sens
• App sens 1
• App sens 2
• App sens 3
• App sense
• Cruise control system
• Cruise req
• D11
• Data
• Ect fuse 15a
• Fuse block
• G114 (left rear of engine)
• G117 (right rear of engine)
• Gnd
• Ground
• Hot at all times
• Hot in run & start
• Hot in run or start
• Iat sensor
• Ign
• Ign e fuse 10a c2
• Ign0 fuse 10a
• Mass airflow sensor (in air intake duct)
• Nca
• Pnk
• Pnk d
• R/a input
• Red
• S/c input
• S103
• S104 (in engine harness)
• S108
• Secondary air injection reaction pump (right rear of engine compt)
• Secondary air injection reaction relay (in engine wiring harness junction block)
• Sens 1 grd
• Sens 1 rt
• Sens 2 grd
• Sens 2 rt
• Sens 3 grd
• Sens 3 rt
• Sens grd
• Signal
• Stp lp in
• Tan
• Tan b
• Throttle actuator control (tac) module (w/ electronic throttle control) (in left rear of engine compt)
• Throttle actuator control motor (w/ electronic throttle control) (on throttle body)
• Throttle position sensor (dual track) (w/ electronic throttle control) (on throttle body)
• Tp sens 1
• Tp sens 2
• Under- hood junction block
• Veh stop fuse 10a

6.0L VIN U, Engine Performance Wiring Diagrams (5 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (5 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness)
• (left front of engine) g110
• (left rear of engine) g114
• (pins 70-72 not used)
• 1-2 ss
• 2-3 ss
• 4wd low
• A/c clu
• A/c req
• A/c system
• Air pump
• Anti-lock brake system
• Anti-lock brake system (speed signal)
• Automatic trans- mission input shaft speed sensor
• Automatic transfer case control module (above c3 headlight switch)
• Cruise control system
• Cruise eng
• Ctrl
• Cyc sw in
• Delivered torq
• Egr ctrl
• Egr gnd
• Eng1 fuse 10a
• Evap canp
• Evap vent
• Front axle switch (right side of center on axle housing)
• Frt axle sw
• Fuel lev
• Fuel pmp
• Fuel sig ctrl
• Fuse block
• G117 (right rear of engine)
• Gen f
• Gen l
• Gnd
• Ho2s htr high
• Ho2s htr low
• Hot in run & start
• Hot in run & start
• Iac coil hi
• Iac coil lo
• Iat sig
• Idle air control valve (top of throttle body)
• Ign
• Ign ctrl
• Ign feed
• Ign1 fuse 10a
• Ignition coils
• Instrument cluster systems (speed signal)
• Instrument panel cluster
• Maf sig
• Malfunction indicator lamp
• Map sig
• Mil ctrl
• Nca
• Nca nca
• Pc sol hi
• Pc sol lo
• Pnk
• Pnk d
• Powertrain control module (left front of engine compt)
• Prnd c
• Recirc door
• Recirc sw
• Red
• Red c
• Ref lo
• Ref low
• Rpm out
• S103
• S151
• S152
• S153
• S154
• S156
• S157
• Sec fuel lvl
• Sec fuel pmp
• Sens gnd
• Spark plug
• Starting/charging system
• Tan
• Tft sens sig
• Tp sig
• Trans rng a
• Transfer case switch (left front of transaxle case)
• Under- hood junction block
• Vss high
• Vss low
• Vss out
• W/ atc
• W/ manual 4wd

6.6L

6.6L VIN 1, Engine Performance Wiring Diagrams, California (1 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, California (1 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (left rear of engine)
• 12v ref
• 5v ref
• A/c system
• B/u lp supp
• Batt
• Battery
• Body control module (left side of dash)
• Can high
• Can low
• Ccp sw
• Ckp signal
• Class2 data
• Cmp sig
• Cool lev
• Coolant level switch (in coolant reservoir)
• Crankshaft position sensor (right side of harmonic balancer)
• Cruise control system
• Data link connector (under left side of dash)
• Ecm1 fuse 10a
• Ect sig
• Engine control module (left front of engine compt)
• Engine coolant temperature sensor (next to oil filler tube)
• Engine oil level switch (left rear of oil pan)
• Ficm relay
• Fuse block
• G114
• G114 (left rear of engine)
• Gen 2 to
• Ground
• Hot in run & start
• Hot w/ vehicle in reverse
• Ia htr
• Ign 0 fuse 10a
• Ign 1
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Low ref
• Nca
• Off/run/crk
• Oil lev sw
• P/n sig
• Plug sig
• Pnk
• Pto en
• Res/acc
• S102
• S103
• Set/coast
• Splice pack sp205 (behind headlamp switch)
• Starting/ charging system
• Tan
• Transmission system
• Under- hood junction block
• Veh b/u fuse 15a
• Water in fuel
• Water in fuel sensor (attached to fuel filter)

6.6L VIN 1, Engine Performance Wiring Diagrams, California (2 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, California (2 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness)
• (left rear of engine)
• A11
• Accelerator pedal position sensor (behind accelerator pedal)
• Battery
• Battery fuse 175a
• C11
• Camshaft position sensor (front of engine)
• Ecmb fuse 20a
• Ecmprv fuse 15a
• F1 c2
• Fuel heater (top of fuel filter element)
• Fuel ht fuse 25a
• Fuel pump (auxiliary tank) (left side frame rail)
• Fuel pump relay
• Fuse holder
• G113 (left front body mount)
• G114
• G114 (left rear of engine)
• G414 (left frame body mount)
• Glow plug controller
• Glow plugs
• Ground
• Hot at all times
• Hot in run & start
• Ign 1
• Ign 1 relay
• Intake air heater (rear of engine)
• Intake air heater relay (rear of engine)
• Intake air temperature/ mass airflow sensor (in air induction tube)
• Nca
• Plug sig
• Pnk
• Red
• Relay ctrl
• S102
• S172
• S173
• S174
• S175
• Series
• Tan
• Under- hood junction block

6.6L VIN 1, Engine Performance Wiring Diagrams, California (3 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, California (3 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harn)
• (in injector harn)
• (in injector harn) s167
• (left rear of eng)
• (pins 49-58 not used)
• (pins 6-43 not used)
• (pins 68-81 not used)
• (pins 82-89 not used)
• (pins 95-113 not used)
• (right front of eng) g119
• Baro sensor (left side of engine)
• Boost sensor (on intake manifold)
• C12
• Can hi
• Can low
• Eng1 fuse 10a
• Engine spd
• Fuel injector control module (right front of engine, under air intake duct assembly)
• Fuel injectors
• Fuel pressure sensor
• G114
• Ground
• Hot in run & start
• Ign
• Ign 2,3,5,8
• Ign pos
• Inj 8
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Injb fuse 25a
• Nca
• Pnk
• Red
• S119
• S166
• S168
• S169
• S170
• S171
• Tan
• Transmission control system
• Under- hood junction block

6.6L VIN 1, Engine Performance Wiring Diagrams, California (4 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, California (4 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harn)
• (left rear of eng)
• 12 v redf
• 4wd low
• 5 volt ref
• A/c clu rly
• A/c hi pres
• A/c low
• A/c req
• A/c system
• Anti-lock brake system
• App sens 1
• App sens 3
• Axle sig
• Baro sens
• Body junction block
• Boost sens
• Brake fuse 10a
• C1 c1
• Charge ind
• Chmsl supp
• Cruise control system
• Cruise fuse 10a
• Cruise on sig
• Electronic suspension system
• Engine control module (left front of engine compt)
• Engine spd
• Engine speed
• Exterior lights system
• F pmp rly ctrl
• Fog lamps fuse 15a
• Front sig hi
• Frp sens
• Fuel lev sens
• Fuel pres reg
• Fuel rail pressure regulator
• Fuel temp sig
• Fuel temperature sensor (under upper intake shield)
• Fuse block
• G114
• Gen f
• Glow plug rly
• Ground
• Hot at all times
• Hot in run
• Hot in run & start
• Ia htr
• Iat sens
• Ign 1 volt
• Ign1 fuse 10a
• Ind logic
• Instrument cluster
• Instrument cluster system
• Instrument panel cluster
• Interior lights system
• Lift/dive
• Low ref
• Maf sens
• Malfunction indicator lamp
• Mil ctrl
• Nca
• Off
• Pnk
• Power take off relay (attached to underhood fuse block bracket)
• Power take off switch
• Pto disable
• Pto engage
• Pto fdbk
• Recirc door
• Red
• Rpm out
• S103
• S163
• S164
• Set
• Sound system
• Sp203 (on top left of dash)
• Starting/charging system
• Stoplight switch (top of brake pedal bracket)
• Tan
• Tcc brake
• Tcm mil
• Transmission control module (left front of eng compt)
• Transmission control system
• Transmission system
• Under- hood junction block
• Vss
• Vss high
• Wait to start

6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (1 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (1 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (left rear of engine)
• 12v ref
• 5v ref
• A/c system
• B/u lp supp
• Batt
• Battery
• Body control module (left side of dash)
• Can high
• Can low
• Ccp sw
• Ckp signal
• Class2 data
• Cmp sig
• Cool lev
• Coolant level switch (in coolant reservoir)
• Crankshaft position sensor (right side of harmonic balancer)
• Cruise control system
• Data link connector (under left side of dash)
• Ecm1 fuse 10a
• Ect sig
• Engine control module (left front of engine compt)
• Engine coolant temperature sensor (next to oil filler tube)
• Engine oil level switch (left rear of oil pan)
• Ficm relay
• Fuse block
• G114
• G114 (left rear of engine)
• Gen 2 to
• Ground
• Hot in run & start
• Hot w/ vehicle in reverse
• Ia htr
• Ign 0 fuse 10a
• Ign 1
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Low ref
• Nca
• Off/run/crk
• Oil lev sw
• P/n sig
• Plug sig
• Pnk
• Pto en
• Res/acc
• S102
• S103
• Set/coast
• Splice pack sp205 (behind headlamp switch)
• Starting/ charging system
• Tan
• Transmission system
• Under- hood junction block
• Veh b/u fuse 15a
• Water in fuel
• Water in fuel sensor (attached to fuel filter)

6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (2 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (2 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (left rear of engine)
• A11
• Accelerator pedal position sensor (behind accelerator pedal)
• Battery fuse 175a
• C11
• Camshaft position sensor (front of engine)
• Ecmb fuse 20a
• Ecmprv fuse 15a
• F1 c2
• Fuel heater (top of fuel filter element)
• Fuel ht fuse 25a
• Fuel pump (auxiliary tank) (left side frame rail)
• Fuel pump relay
• Fuse holder
• G113 (left front body mount)
• G114
• G114 (left rear of engine)
• G414 (left frame body mount)
• Glow plug relay
• Glow plug/ intake heater relay assembly
• Glow plugs
• Hot at all times
• Hot in run & start
• Ign 1 relay
• Intake air heater (rear of engine)
• Intake air heater relay
• Intake air temperature/ mass airflow sensor (in air induction tube)
• Nca
• Pnk
• Red
• S102
• Series
• Tan
• Under- hood junction block

6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (3 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (3 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harn)
• (in injector harn)
• (in injector harn) s167
• (left rear of eng)
• (pins 49-58 not used)
• (pins 6-43 not used)
• (pins 68-81 not used)
• (pins 82-89 not used)
• (pins 95-113 not used)
• (right front of eng) g119
• Baro sensor (left side of engine)
• Boost sensor (on intake manifold)
• C12
• Can hi
• Can low
• Eng1 fuse 10a
• Engine spd
• Fuel injector control module (right front of engine, under air intake duct assembly)
• Fuel injectors
• Fuel pressure sensor
• G114
• Ground
• Hot in run & start
• Ign
• Ign 2,3,5,8
• Ign pos
• Inj 8
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Injb fuse 25a
• Nca
• Pnk
• Red
• S119
• S166
• S168
• S169
• S170
• S171
• Tan
• Transmission control system
• Under- hood junction block

6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (4 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (4 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harn)
• (left rear of eng)
• 12 v redf
• 4wd low
• 5 volt ref
• A/c clu rly
• A/c hi pres
• A/c low
• A/c req
• A/c system
• Anti-lock brake system
• App sens 1
• App sens 3
• Axle sig
• Baro sens
• Body junction block
• Boost sens
• Brake fuse 10a
• C1 c1
• Charge ind
• Chmsl supp
• Cruise control system
• Cruise fuse 10a
• Cruise on sig
• Electronic suspension system
• Engine control module (left front of engine compt)
• Engine spd
• Engine speed
• Exterior lights system
• F pmp rly ctrl
• Fog lamps fuse 15a
• Front sig hi
• Frp sens
• Fuel lev sens
• Fuel pres reg
• Fuel rail pressure regulator
• Fuel temp sig
• Fuel temperature sensor (under upper intake shield)
• Fuse block
• G114
• Gen f
• Glow plug rly
• Ground
• Hot at all times
• Hot in run
• Hot in run & start
• Ia htr
• Iat sens
• Ign 1 volt
• Ign1 fuse 10a
• Ind logic
• Instrument cluster
• Instrument cluster system
• Instrument panel cluster
• Interior lights system
• Lift/dive
• Low ref
• Maf sens
• Malfunction indicator lamp
• Mil ctrl
• Nca
• Off
• Pnk
• Power take off relay (attached to underhood fuse block bracket)
• Power take off switch
• Pto disable
• Pto engage
• Pto fdbk
• Recirc door
• Red
• Rpm out
• S103
• S163
• S164
• Set
• Sound system
• Sp203 (on top left of dash)
• Starting/charging system
• Stoplight switch (top of brake pedal bracket)
• Tan
• Tcc brake
• Tcm mil
• Transmission control module (left front of eng compt)
• Transmission control system
• Transmission system
• Under- hood junction block
• Vss
• Vss high
• Wait to start

8.1L

8.1L VIN G, Engine Performance Wiring Diagrams (1 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (1 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• (below steering column) data link connector
• (lower right rear of engine) crankshaft position sensor
• +5v
• Body control module (below steering column)
• Brk sw
• C10
• C11
• C12
• Ckp
• Cls 2 data
• Clutch sw
• Cmp
• Coolant lev
• E12
• Ecm1 fuse 10a
• Ecmb fuse 20a
• Ect sig
• Egr input
• Electronic suspension system
• Fuse block
• G117 (right rear of engine)
• Gnd
• Ho2s hi
• Ho2s lo
• Hot at all times
• Hot in run & start
• Ign
• Ign 0 fuse 10a
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Inja fuse 15a
• Injb fuse 15a
• Injectors
• Ks signal
• Lift/dive sig
• Low ref
• Nca
• O2b fuse 15a
• Oil lev
• Pnk
• Powertrain control module (left front of engine compt)
• Prnd p
• Pto enable
• Pto eng kill
• Pto engage
• Pto status
• Ref low
• Req torque
• S103
• S152
• S154
• Sens gnd
• Sens rtn
• Serial data
• Sp205 (behind headlamp switch)
• Tan
• Transmission control system
• Under- hood junction block

8.1L VIN G, Engine Performance Wiring Diagrams (2 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (2 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness)
• (left front of engine)
• (left rear of engine)
• (left rear of engine) g114
• Ecm b fuse 20a
• Engine coolant level switch (in coolant reservoir)
• Engine coolant temperature sensor (left front of cylinder head)
• Engine oil level switch (right side of oil pan)
• Fuel pump relay
• G104
• G110
• G117 (right rear of engine)
• G402 (left frame body mount bracket)
• Heated oxygen sensor (bank 1 sensor 1) (left exh pipe before converter)
• Heated oxygen sensor (bank 1 sensor 2) (left exh pipe after converter)
• Heated oxygen sensor (bank 2 sensor 1) (right exh pipe before converter)
• Heated oxygen sensor (bank 2 sensor 2) (right exh pipe after converter)
• Hot at all times
• Knock sensor 1 (under intake manifold)
• Knock sensor 2 (under intake manifold)
• Nca
• Park/neutral position switch (left side of transmission)
• Pnk
• Primary fuel pump/ level sensor (in fuel tank)
• S103
• S104
• S114a
• S115
• S116
• S312
• Secondary fuel pump relay
• Secondary fuel pump/ level sensor (in fuel tank)
• Tan
• Under- hood junction block

8.1L VIN G, Engine Performance Wiring Diagrams (3 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (3 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• Body junction block
• Brake fuse 10a
• Camshaft position sensor (on left side of timing cover)
• Clutch pedal position switch (top of pedal bracket)
• Cruise control system
• Cruise fuse 10a
• Del torque
• Evap canister purge valve (top right rear of engine)
• Evap canister vent valve (left front side of fuel tank)
• Exhaust gas recirculation valve (top right front of engine)
• F12
• Fog lamps fuse 15a
• Fuel tank pressure sensor (in fuel tank)
• Fuse block
• G202 (upper left side of dash)
• Harn)
• Hot in run
• Hot in run & start
• Ind logic
• Interior lights system
• Manifold absolute pressure sensor (top rear of engine)
• Mil req
• Off
• Pnk
• Pnk a
• Pnk b
• Power take off relay (on underhood junction block)
• Power take off switch
• Red
• Red e
• Req torque
• S161
• S162
• S163
• S164 (engine harn)
• Set
• Stop lps fuse 20a
• Stop- lamp switch (top of brake pedal bracket)
• Tan
• Transmission control module (left front of engine compt)
• Under- hood junction block
• Unm tor
• Vehicle speed sensor (left rear of transmission)
• Vss
• Vss adapter (4wd) (left side of trans)

8.1L VIN G, Engine Performance Wiring Diagrams (4 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (4 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• (right rear of engine compt) secondary air injection reaction solenoid
• A10
• Accelerator pedal position sensor
• Act cntrl
• Air maxi fuse 30a c7
• App sens
• App sens 1
• App sens 2
• App sens 3
• App sense
• Cruise control system
• Cruise req
• D11
• Data
• Ect fuse 15a
• G114 (left rear of engine)
• G117 (right rear of engine)
• Gnd
• Ground
• Hot at all times
• Hot in run & start
• Hot in run or start
• Iat sensor
• Ign
• Ign e fuse 10a c2
• Mass airflow sensor (in air intake duct)
• Nca
• Pnk
• Pnk d
• R/a input
• Red
• S/c input
• S103
• S104 (in engine harness)
• S108
• Secondary air injection reaction pump (right rear of engine compt)
• Secondary air injection reaction relay (in engine wiring harness junction block)
• Sens 1 grd
• Sens 1 rt
• Sens 2 grd
• Sens 2 rt
• Sens 3 grd
• Sens 3 rt
• Sens grd
• Signal
• Stp lp in
• Tan
• Tan b
• Throttle actuator control (tac) module (in left rear of engine compt)
• Throttle actuator control motor (near front of engine compt)
• Throttle position sensor (dual track) (near front of eng compt)
• Tp sens 1
• Tp sens 2
• Under- hood junction block
• Veh stop fuse 10a

8.1L VIN G, Engine Performance Wiring Diagrams (5 of 5) for GMC Cab & Chassis Sierra 2001 3500

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (5 of 5) for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness)
• (left front of engine) g110
• (left rear of engine) g114
• (pins 70-71 not used)
• (pins 76-79 not used)
• 4wd low
• A/c clu
• A/c req
• A/c system
• Air pump
• Anti-lock brake system (speed signal)
• Automatic trans- mission input shaft speed sensor
• Automatic transfer case control module (above c3 headlight switch)
• Cruise control system
• Cruise eng
• Ctrl
• Cyc sw in
• Delivered torq
• Egr ctrl
• Egr gnd
• Eng1 fuse 10a
• Evap canp
• Evap vent
• Front axle switch (right side of center on axle housing)
• Frt axle sw
• Fuel lev
• Fuel pmp
• Fuel sig ctrl
• Fuse block
• G117 (right rear of engine)
• Gen f
• Gen l
• Gnd
• Ho2s htr hi
• Ho2s htr high
• Ho2s htr low
• Ho2s low ctrl
• Hot in run & start
• Hot in run & start
• Iat sig
• Ign
• Ign ctrl
• Ign feed
• Ign1 fuse 10a
• Ignition coils
• Instrument cluster systems (speed signal)
• Instrument panel cluster
• Maf sig
• Malfunction indicator lamp
• Map sig
• Mil ctrl
• Nca
• Nca nca
• Pnk
• Pnk d
• Powertrain control module (left front of engine compt)
• Recirc door
• Recirc sw
• Red
• Red c
• Ref lo
• Ref low
• Rpm out
• S103
• S148
• S149
• S151
• S153
• S159
• S160
• Sec fuel lvl
• Sec fuel pmp
• Sens gnd
• Spark plug
• Starting/charging system
• Tan
• Tcc ctrl
• Trans mil
• Transfer case switch (left front of transaxle case)
• Under- hood junction block
• Vss high
• Vss low
• Vss out
• W/ atc
• W/ manual 4wd

EXTERIOR LIGHTS

Back-up Lamps Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Back-up Lamps Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (left side of transmission) back-up lamp switch
• A trailer connector (heavy duty)
• A/t
• B/u lp fuse 25a
• B10
• Back-up alarm (w/ rpo)
• Back-up lamp switch (part of park/neutral position switch) (left side of transmission)
• Body computer module (lower left side of dash)
• G415 (on spare tire
• Hoist bracket)
• Hot in run or start
• Left back-up lamp
• M/t
• Mirrors system (automatic day/night mirror)
• Pnk
• Rear lamps bussing block (front of rear bumber, on crossmember)
• Right back-up lamp
• S416 (left frame rail near body mount)
• Trlr b/u fuse 10a
• Underhood junction block (left side of eng compt, near battery)
• Veh b/u fuse 15a

Exterior Lamps Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Exterior Lamps Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (at roof marker lamps) s200
• (left side of dash) body junction block
• (left side of dash) fuse block
• (left side of eng comt, near battery) underhood junction block
• (upper right kick panel)
• A c3
• A10
• A12
• A4 c1
• Auto
• B10
• Base
• Body control module (lower left side of dash)
• Body junction block (left side of dash)
• Bulbs
• C1 b11
• C1 b12
• C1 b2
• C1 b7
• C1 d
• C1 f6
• C1 f7
• C11 c1
• C2 a
• C2 a6
• C2 a7
• C2 b6
• C2 c
• C2 d
• C2 d11
• C2 d12
• C3 e2
• C3 h
• C4 a
• C4 c
• C4 d
• C4 f
• C6 b
• C6 g
• Center high mount stop lamp/ cargo lamp
• Chmsl fuse 10a
• Clear- ance lamps
• Cruise control system
• D10
• D11
• E c1
• F nca
• F11
• F12
• Fr prk fuse 10a
• Fuse block (lower left side of dash)
• Fuse block (under left side of dash)
• G108 (left radiator support bracket)
• G200 (upper left kick panel)
• G203
• G203 (upper right kick panel)
• G300 (under driver seat)
• G415 (on spare tire hoist bracket)
• Haz lp fuse 20a
• Hazard
• Head
• Headlamp & panel dimmer switch
• Hot at all times
• Hot in run or start
• I/p junction block (lower right side of dash)
• Instrument cluster
• Int prk fuse 10a
• Interior lights system
• Left
• Left front marker lamp
• Left front park/ turn lamp
• Left license lamp
• Left outside power mirror
• Left rear turn lamp
• Left tail/ stop- lamp
• Left turn in
• Left turn ind
• Lr prk fuse 10a
• Lt turn fuse 10a
• Nca
• Nca h
• Normal
• Park
• Park lamp relay
• Park lps fuse 30a
• Park rly ctrl
• Pnk
• Puddle lamp relay
• Puddle rly ctrl
• Rear lamps junction block (front of rear bumper, on cross- member)
• Right
• Right front marker lamp
• Right front park/ turn lamp
• Right license lamp
• Right outside power mirror
• Right rear turn lamp
• Right tail/ stop- lamp
• Right turn in
• Right turn ind
• Roof beacon provision
• Roof beacon relay (left "b" pillar)
• Roof beacon switch
• Roof marker lamps
• Rr prk fuse 10a
• Rt turn fuse 10a
• S100
• S101
• S201
• Seo 1 fuse 15a
• Seo 2 fuse 30a
• Sp203
• Stop lamp switch (on brake pedal support bracket)
• Stop lps fuse 20a
• Throttle actuator control module
• Trailer circuit
• Trailer wiring provision
• Turn fuse 20a
• Turn/ hazard switch
• Turn/hazard flasher
• Underhood junction block (left side of eng compt, near battery)
• Uplevel
• Veh stop fuse 10a

Trailer/Camper Adapter Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Trailer/Camper Adapter Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (in camper wiring harn)
• Body control module
• Body junction block (left side of dash)
• C1 c
• C1 c11
• C1 f2
• C10 c1
• C2 d10
• C3 b3
• C3 e1
• C3 e5
• C5 a
• C5 b
• C5 c
• C5 d
• C5 f
• Camper extension
• Camper in-line connector
• Camper wiring (pickup only)
• Chmsl fuse 10a
• D10
• E10
• F c1
• F10 c2
• G203 (upper left kick panel)
• G415 (on spare tire hoist bracket)
• Heavy duty trailer wiring
• Hot at all times
• Hot with back-up lamp switch closed
• Hot with park lamp relay energized
• Hot with stop lamp switch depressed
• Int prk fuse 10a
• Light duty trailer wiring
• Nca
• Pickup only
• Red
• S400 (in camper wiring harn)
• S401 (in camper wiring harn)
• S402 (in camper wiring harn)
• S403 (in camper wiring harn)
• S404 (in camper wiring harn)
• S405
• S406
• Splice pack
• Stud 1
• Stud 1 maxi fuse 40a
• Stud 2
• Stud 2 maxi fuse 30a
• Trailer connector
• Trailer in-line connector
• Trl l trn fuse 10a
• Trl prk fuse 15a
• Trl r trn fuse 10a
• Trlr b/u fuse 15a
• Turn/ hazard switch
• Underhood junction block (left side of eng compt, near battery)
• Utilities only
• Veh b/u fuse 15a

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for Ground Distribution Wiring Diagram (1 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (4.3l) g119 (right front of engine)
• (6.6l) g119 (right front of engine)
• (others) (canada)
• 4.3l
• A c1
• A/c
• A/c high pressure recirculating switch
• A/c low pressure switch
• All other gas
• Automatic transmission control (allison)
• Auxiliary
• B8 c2
• Battery relay
• Body junction block (under left side of dash)
• Brake fluid
• C d
• C2 a7
• Coil module
• Compressor clutch
• Coolant level switch
• Cruise control module
• D12
• Data link connector (dlc)
• Driver information center (dic)
• Electronic brake control module (ebcm)
• Engine
• Front axle actuator
• Front windshield washer fluid pump
• Fuel heater
• Fuel pump & sender assembly
• Fuel pump relay
• G108 (left radiator support bracket)
• G113 (on left front body mount)
• G114 (left rear of engine)
• G117 (right rear of engine)
• G132 (right front of engine block)
• Headlamp relay
• Heated oxygen sensor (ho2s) (bank 1 sensor 1)
• Heated oxygen sensor (ho2s) (bank 1 sensor 2)
• Heated oxygen sensor (ho2s) (bank 2 sensor 1)
• Heated oxygen sensor (ho2s) (bank 2 sensor 2)
• Ign 1 relay
• Ignition
• Ignition coils (left bank) (v8 gas only)
• Ignition coils (right bank) (v8 gas only)
• Instrument panel cluster (ipc)
• Left battery
• Left daytime running lamp (drl)
• Left fog lamp
• Left horn
• Left park/ turn signal lamp
• Level switch
• Mass air flow (maf) sensor
• Motor module
• Nca
• Oil level switch
• Park/ neutral position switch
• Power
• Powertrain control module (pcm)
• Rear window washer pump
• Right battery
• Right daytime running lamp (drl)
• Right fog lamp
• Right horn
• Right park/ turn signal lamp
• S102 (engine harness)
• S103 (engine harness)
• S156 (eng harn)
• S157 (engine harn)
• Secondary air injection (air) pump
• Secondary air injection (air) solenoid
• Secondary fuel pump & sender assembly
• Starter relay
• Takeoff (pto)
• Throttle actuator control module
• Transfer case control module
• Transfer case shift control switch
• Underhood junction block (left side of engine compt)
• Underhood lamp
• V8 gas
• W/atc
• W/o atc
• Washer fluid level sensor
• Windshield wiper

Ground Distribution Wiring Diagram (2 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for Ground Distribution Wiring Diagram (2 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (base only)
• (base only) air temperature actuator
• (base only) driver door lock switch
• (base only) driver mini wedge (door jamb switch)
• (base only) front passenger door lock switch
• (base only) front passenger mini wedge (door jamb switch)
• (base only) mode actuator
• (base only) recirculation door motor
• (base pickup only) cigar lighter
• (not used)
• (pickup) fog/ cargo lamp switch (utility) foglamp/ rear window wiper switch
• (uplevel only) transfer case shift control switch
• A utility pickup
• A/t shift lock solenoid
• A12
• A16
• Accessory power outlet
• Ashtray lamp
• Audio amplifier
• Automatic day-night rearview mirror w/ compass
• B12
• Bin lamp
• Blower motor switch/hvac control module
• Body control module (bcm)
• Body junction block (under left side of dash)
• C10
• C11
• C297
• C297c
• Center high mounted stop/ cargo lamp
• Cigar lighter
• Courtesy lamp module
• Courtesy lamp relay
• Data link connector (dlc)
• Dimmer switch
• Door locks relay
• Driver door key switch
• Driver mini wedge (door jamb switch)
• Driver outside power mirror
• Driver window/ door lock switch
• E13
• E16
• F12
• Fuse block (lower left side of dash)
• G200 (upper left kick panel)
• Headlamp dimmer switch
• Heated/ memory seat switch
• Horn switch
• Ignition key alarm switch
• Inflatable restraint ip module switch
• Inside air temperature sensor assembly
• Instrument panel cluster (ipc)
• Left rear heated seat switch
• Left vanity mirror
• Luxury only
• Mid courtesy/ reading lamp
• Nca
• Outside power mirror switch
• Park switch
• Power door lock switch
• Power window switch
• Radio
• Reading lamps
• Rear courtesy/ reading lamp
• Rear seat audio (rsa) controller
• Remote control door lock receiver
• Right rear heated seat switch
• Right vanity mirror
• Roof beacon switch
• S303
• S305 (in headliner harness)
• Selectable ride switch
• Sp203
• Steering column
• Suburban only
• Tow/ haul switch
• Traction control switch
• Transfer case shift control module
• Turn/ hazard flasher
• Uplevel only
• Vehicle interface unit (viu)

Ground Distribution Wiring Diagram (3 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for Ground Distribution Wiring Diagram (3 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (auto- ecc) hvac control module
• (base seat)
• (base suburban/ utility) front passenger door lock switch
• (heavy duty) trailer connector
• (light duty) trailer connector
• (uplevel) air temperature actuator
• (uplevel) hvac control module
• (uplevel) mode actuator motor
• (uplevel) recirculation motor
• 6.0l
• A11
• A18
• Blower motor resistor assembly
• C10
• Door lock switch
• Driver heated seat element
• Driver heated seat relay
• Driver seat adjust switch
• Driver seat adjuster switch
• Driver seat bolster switch
• Driver seat lumbar motor
• Front
• Front passenger heated seat element
• Front passenger heated seat relay
• Front passenger heated seat switch
• Front passenger heated seat thermistor
• Front passenger mini wedge (door jamb switch
• Front passenger mini wedge (door jamb switch)
• Front passenger seat adjuster switch
• Front passenger window/ door lock switch
• Full feature seat
• G203 (upper right kick panel)
• G300 (under driver's seat)
• G415 (on spare tire hoist bracket) (w/ rear lamps bussing block)
• G416 (left rear body mount)
• G416 (on left frame rail near body mount)
• Heated seat thermistor
• I/p compart- ment lamp
• Inflatable restraint sensing & diagnostic module
• Ip junction block (lower right side of dash)
• Left back-up lamp
• Left front shock solenoid
• Left license lamp
• Left rear shock solenoid
• Left rear tail/ stoplamp
• Left rear turn signal lamp
• Memory seat module
• Nca
• Nca b
• Passenger outside rearview mirror
• Passenger seat adjuster switch
• Passenger seat bolster switch
• Passenger seat lumbar motor
• Power seat
• Power sunroof module
• Power window switch
• Primary fuel pump & sender assembly
• Rap 2 relay
• Rear lamps bussing block (front of rear bumper on crossmember)
• Right back-up lamp
• Right front shock solenoid
• Right license lamp
• Right rear shock solenoid
• Right rear tail/ stoplamp
• Right rear turn signal lamp
• Roof beacon ground
• Roof beacon relay
• Roof marker lamps
• S201 (near roof marker lamps)
• S307
• S308
• S309
• Seat belt switch
• Secondary fuel pump & sender assembly
• Uplevel only
• Window lock out

Ground Distribution Wiring Diagram (4 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for Ground Distribution Wiring Diagram (4 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (ecc-auto) c2
• (front) auxiliary blower motor switch
• (heavy duty) trailer connector
• (light duty) trailer connector
• (others)
• (pickup only) rear window defogger grid
• (rear) auxiliary blower motor switch
• (security) right cargo key switch
• (suburban/ yukon xl) rear dome lamp
• (utility) roof beacon ground
• (utility) roof beacon relay
• (w/heat or a/c, or auto-ecc) auxiliary blower motor resistor assembly
• (w/o auto) auxiliary blower motor resistor assembly
• (w/o sunroof)
• (w/sunroof)
• 4 door tahoe/yukon
• A a
• A8 b8
• Accessory power outlet (console)
• Auxiliary a/c request switch
• Auxiliary air temperature actuator
• Auxiliary mode actuator
• Cargo door
• Center high mounted stoplamp
• Compressor leveling module
• G305 (right "b" pillar)
• G308 (left "b" pillar)
• G415 (on spare tire hoist bracket) (w/o rear lamps bussing block)
• G998 (rear corner of right rear window)
• Hvac control module
• Left back-up lamp
• Left cargo door ajar switch
• Left cargo rear window defogger grid
• Left door contactor
• Left license lamp
• Left liftgate ajar switch
• Left rear heated seat module
• Left rear mini wedge (door jamb switch)
• Left rear tail/ stoplamp
• Left rear turn signal lamp
• Left rear window/ door lock switch
• Liftgate
• Liftgate key switch
• Liftglass ajar switch
• Nca
• Rear accessory power outlet
• Rear window defogger grid
• Rear window wiper module
• Right back-up lamp
• Right cargo door ajar switch
• Right cargo rear window defogger grid
• Right door contactor
• Right license lamp
• Right liftgate ajar switch
• Right rear heated seat module
• Right rear mini wedge (door jamb switch)
• Right rear tail/ stoplamp
• Right rear turn signal lamp
• Right rear window/ door lock switch
• S410
• S415
• S420
• Sp410
• Sp410a
• Suburban/ yukon xl
• Suspension control module
• W/ecc- auto

HEADLIGHTS

Headlight Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Headlight Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• A11
• Al sens ref
• Al sens sig
• Ambient light sensor (on top center of dash)
• Auto
• Body control module (lower left side of dash)
• Body junction block (under left side of dash)
• C1 b4
• C1 d3
• C1 f7
• C2 f7
• Drl fuse 10a
• Drl relay
• E10
• E11
• E12
• E13
• Exterior lamps system (park lamp relay)
• F2 c1
• Flash- to-pass
• Fog lamp switch
• Fog lp relay
• Fog lp sw
• Fog lps fuse 15a
• Ftp in
• G108 (on left radiator support)
• G114 (left rear of engine)
• G202
• Head
• Headlamp dimmer switch
• Headlamp relay
• Headlamp switch
• High
• High beam
• Hot at all times
• Hot in run or start
• Igne fuse 10a
• Left drl lamp
• Left fog lamp
• Left high beam headlamp
• Left low beam headlamp
• Low
• Lt hdlp fuse 15a
• On indicator
• Park
• Pickups
• Right drl lamp
• Right fog lamp
• Right high beam headlamp
• Right low beam headlamp
• S100
• S101
• S102
• Splice pack 203 (left side of dash)
• Tbc fuse 10a
• Underhood junction block (left side of engine compt)
• Utilities

HORN

Horn Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Horn Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (left side of engine compartment)
• A11
• C1 body control module (in center console)
• G108 (left radiator support bracket)
• Horn fuse 15a
• Horn relay
• Horn switch
• Hot at all times
• Left horn (left side of radiator support)
• Nca
• Right horn (right side of radiator support)
• S101
• S10o
• Underhood junction block

INSTRUMENT CLUSTER

Driver Information Center Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Driver Information Center Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• Battery
• Body junction block
• Body junction block (under left side of dash, near kick panel)
• Class 2 data
• Data link connector (below steering column)
• Driver information center
• Fuse block (on lower left side of dash)
• G117 (right rear of engine)
• Ground
• Hot at all times
• Hot in run, bulb test, or start
• Hot in run, start or w/ rap energized
• Ign 1 fuse 10a
• Ign 1 volt
• Instrument panel cluster
• Interior lights system
• Lamp voltage
• Pnk
• Powertrain control module (pcm) (on left front of engine compt)
• Radio fuse 10a
• Rap volt
• Rdo 1 fuse 10a
• Sp205 (behind headlamp switch)
• Underhood junction block
• Underhood junction block (at left side of engine compt, near battery)
• Vss
• Vss out

Instrument Cluster Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Instrument Cluster Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (not used)
• 4wd ind
• A10
• A11
• A12
• A4 pnk d8
• Abs ind
• Air bag ind
• B10
• B11
• B12
• Body control module
• Body junction block
• Body junction block (under left side of dash, near kick panel)
• Body wiring harness junction block
• Brake ind
• C201
• Class 2 data
• Computer data lines system
• Cruise control module
• Cruise fuse 10a
• Cruise ind
• Cruise pwr
• Data lines
• Driver information center
• Engine controls system
• Engine oil pressure sensor
• Exterior lights system
• Fuel gauge
• Fuel lvl-primary
• Fuel lvl-secondary
• Fuel pump & sender assembly- primary
• Fuel pump & sender assembly- secondary
• Fuse block (on lower left side of dash)
• G108 (left radiator support bracket)
• G117 (right rear of engine)
• G200 (upper left kick panel)
• High beam ind
• Hot at all times
• Hot in run
• Hot in run, bulb test, or start
• Hour meter
• Ign 1 fuse 10a
• Ign o fuse 10a
• Ignition 0
• Illum pwr
• Illumination (6 bulbs)
• Instrument cluster
• Interior lights system
• Led dim
• Left turn ind
• Logic
• Low ref
• Low wash
• Low washer switch (in washer fluid reservoir)
• Message center
• Nca
• Odometer
• Oil gauge
• Oil press
• Park brake switch (part of the park brake assembly)
• Park sw
• Pnk
• Powertrain control module (pcm) (on left front of engine compt)
• Prnd321
• Radio
• Radio fuse 10a
• Right turn ind
• S100
• S312
• Seat belt ind
• Service engine soon ind
• Sp203
• Spare
• Speedometer
• Suspension control module
• Tach out
• Tacho
• Tachometer
• Temp gauge
• Trans temp gauge
• Trip
• Underhood junction block
• Underhood junction block (at left side of engine compt, near battery)
• Upshift ind
• Volts gauge
• Vss
• Vss out
• W/ dual tank
• W/o dual tank

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram, Base for GMC Cab & Chassis Sierra 2001 3500

List of elements for Courtesy Lamps Wiring Diagram, Base for GMC Cab & Chassis Sierra 2001 3500:

• (not used)
• A10
• A12
• B (not used)
• B1 (not used)
• B12
• Body control module (on lower left side of dash, below steering column)
• Body junction block (under left side of dash, near left kick panel)
• C10
• C11
• C12
• C9 c2
• Cargo lamp
• Cargo lamp switch
• Cargo lp sw
• Courtesy lamp relay
• Ctsy lp fuse 15a
• Ctsy lp rly
• D (not used)
• Dome lamp
• Dome lamp defeat switch
• Dome lamp switch
• Dome lp dft
• Dome lp sw
• Fuse block (on lower left side of dash)
• G132 (right front of engine block)
• G200 (upper left kick panel)
• Headlamp & panel dimmer switch
• Hot at all times
• Inadvert rly
• Inadvertant power relay
• Lamp request
• Left i/p courtesy lamp
• Left mini wedge (door jamb switch)
• Lt door jamb
• Right i/p courtesy lamp
• Right mini wedge (door jamb switch)
• Rt dr jamb
• S102
• Sp203
• Tan
• Underhood junction block (on left side of engine compt, near battery)
• Underhood off lamp assembly

Courtesy Lamps Wiring Diagram, Up Level for GMC Cab & Chassis Sierra 2001 3500

List of elements for Courtesy Lamps Wiring Diagram, Up Level for GMC Cab & Chassis Sierra 2001 3500:

• (not used)
• A10
• A11
• B12
• Body control module (on lower left side of dash, below steering column)
• Body junction block (under left side of dash, near left kick panel)
• C10
• C12
• C9 c2
• Cargo lamp
• Cargo lamp switch
• Cargo lp sw
• Courtesy lamp relay
• Ctsy lp fuse 15a
• Ctsy lp rly
• D10
• Dome lamp
• Dome lamp defeat switch
• Dome lamp switch
• Dome lp dft
• Dome lp sw
• Fuse block (on lower left side of dash)
• G132 (right front of engine block)
• G200 (upper left kick panel)
• G203 (upper right kick panel)
• Headlamp & panel dimmer switch
• Hot at all times
• I/p compart- ment lamp
• I/p junction block (on lower right side of dash)
• Inadvert rly
• Inadvertent power relay
• Lamp request
• Left front door courtesy lamp
• Left i/p courtesy lamp
• Reading lamps
• Right front door courtesy lamp
• Right i/p courtesy lamp
• S102
• Sp203
• Underhood junction block (on left side of engine compt, near battery)
• Underhood lamp assembly off

Instrument Illumination Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Instrument Illumination Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (4 bulbs)
• (6 bulbs)
• A12
• Ashtray lamp
• Auto
• B12
• B5 c1
• Base
• Body control module (on lower left side of dash, below steering column)
• Body junction block (under left side of dash, near left kick panel)
• C10
• Dim in
• Driver heated seat switch
• F12
• Fog/ cargo lamp switch
• Fuse block (on lower left side of dash)
• G200 (upper left kick panel)
• G203 (upper right kick panel)
• Head
• Headlamp & panel dimmer switch
• Hot at all times
• Hvac control module
• I/p dim
• I/p junction block (on lower right side of dash)
• Illum fuse 10a
• Inflatable restraint i/p module switch
• Instrument cluster
• Int prk fuse 10a
• Left power door lock switch
• Left power window switch
• Left power window/ door lock switch
• Nca
• Parade mode
• Park
• Park lp rly
• Park lp sig
• Park lps fuse 30a
• Parklamp relay
• Power mirror switch
• Radio
• Roof beacon switch
• Select- able ride switch
• Sp203
• Traction assist switch
• Transfer case shift control switch
• Underhood junction block (on left side of engine compt, near battery)
• Up level

MEMORY SYSTEMS

Driver's Memory Seat Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Driver's Memory Seat Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (under driver's seat)
• A/t shift lock
• A3 a3
• B7 c1
• Back
• Batt pos volt
• Btsi fuse 10a
• Driver seat adjustment switch
• Driver window door lock switch
• Front vert dn
• Front vert up
• Frt dn
• Frt up
• Ft vert dn ctrl
• Ft vert pos sen
• Ft vert up ctrl
• Fuse block (lower left side of dash)
• Fwd
• G c4
• G304 (under driver's seat)
• Ground
• Hall effect sensor
• Horiz fwd
• Horiz fwd ctrl
• Horiz pos sen
• Horiz rwd
• Horiz rwd ctrl
• Hot at all times
• Hot in run
• Ign 3 fuse 10a
• Ign 3 volt
• Memory 1 sw
• Memory 2 sw
• Memory seat module (underside of driver's seat)
• Memory seat switch
• Memory set sw
• Mir/lock fuse 3a
• Nca
• Not used
• Rcl 1
• Rcl 2
• Rcl back
• Rcl fwd
• Rear dn
• Rear up
• Rear vert dn
• Rear vert up
• Recline fwd
• Recline fwd ctrl
• Recline pos sen
• Recline rwd
• Recline rwd ctrl
• Recliner motor
• Red
• Rr vert dn ctrl
• Rr vert pos sen
• Rr vert up ctrl
• S308
• S310
• S314
• S315
• S316
• Seat front verticle motor (under driver's seat)
• Seat horizonal motor (under driver's seat)
• Seat rear vertical motor (under driver's seat)
• Seats circuit breaker 25a
• Set
• Shift interlock system
• Tan
• Underhood junction block (at left side of engine compartment, near battery)

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for Power Distribution Wiring Diagram (1 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (base pickup (uplevel pickup, utilities)
• (diagram 1 of 4)
• (not used)
• (on left side of engine compt) underhood junction block
• (right rear side of cargo area)
• (under left side of dash) body junction block
• (upper left kick panel)
• A/c compressor relay
• A/c fuse 10a
• Abs fuse 60a
• Accessory power outlet
• Accessory power outlet (console)
• Air fuse 30a
• Atc fuse 20a
• Audio amplifier
• Automatic transmission control module (allison)
• Aux pwr fuse 20a
• B12
• B12 d2
• Base
• Bat
• Battery cable junction block
• Body control module
• C1 f2
• C10
• C12
• Cigar fuse 15a
• Cigar lighter
• Ctsy lp fuse 15a
• D10
• D11
• D12
• Data link connector (dlc)
• Daytime running lamp (drl) relay
• Diesel only
• Dimmer switch
• Driver infor- mation center (dic)
• Driver seat
• Drl fuse 10a
• E nca
• E10
• Ecm b fuse 20a
• Electronic brake control module (ebcm)
• Engine control module (ecm)/ powertrain control module (pcm)
• F10
• F11
• F12
• Fog lps fuse 15a
• Foglamp relay
• From air fuse b
• From fuse l block (diagram 4 of 4)
• From rap fuse c (diagram 1 of 4)
• Front blower motor resistor assembly
• Front passenger window/door lock switch
• Frt hvac fuse 30a
• Fuel pump relay
• Fusible link (10 ga- red)
• G200
• G203 (upper right kick panel)
• G405
• Generator
• Generator (w/ dual diesel only)
• Hazard fuse 20a
• Headlamp dimmer switch
• Headlamp relay
• Horn relay
• Hvac control module
• I/p junction block
• Inadvertent power relay
• Instrument panel cluster (ipc)
• L nca
• Left battery
• Nca
• Park lamps fuse 30a
• Parklamp relay
• Passenger seat
• Power sunroof
• Power takeoff (pto) relay
• Pwr wdo cb 25a
• Radio
• Radio fuse 15a
• Rap 2 fuse 50a
• Rap 2 relay
• Rap fuse 50a
• Rdo amp fuse 25a
• Rear accessory power outlet
• Red
• Remote control door lock receiver
• Right rear defogger relay
• Right rear heated seat switch
• Right rear window/door lock switch
• Roof beacon relay
• Roof beacon switch
• Secondary air injection (air) pump relay
• Seo 1 fuse 15a
• Seo 2 fuse 30a
• Sp203
• Sp410
• Starter solenoid
• Stop lps fuse 20a
• Stoplamp switch
• Sunroof module
• Tbc fuse 10a
• To auxiliary battery relay (diagram 3 of 4)
• To ecm b fuse (diagram 1 of 4)
• To fuse block (mir/lock fuse) (diagram 4 of 4)
• To ign 1 relay (diagram 3 of 4)
• To ign a fuse (diagram 2 of 4)
• To park lamps fuse (diagram 1 of 4)
• Transfer case encoder motor
• Transfer case shift module
• Turn signal/ multi- function switch
• Under- hood junction block (on left side of engine compt)
• Under- hood junction block (on left side of engine)
• Uplevel
• Vehicle interface unit (onstar)

Power Distribution Wiring Diagram (2 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for Power Distribution Wiring Diagram (2 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (4.3l)
• (a/t)
• (all others)
• (canada built)
• (diesel)
• (gas)
• (m/t)
• (not used)
• (others)
• A/c clutch relay
• A10
• A13
• Acc
• Air bag fuse 15a
• Automatic transmission
• B/u lp fuse 25a
• B11
• Back-up lamp switch (part of park/ neutral position switch (a/t))
• Body control module
• Body junction block (under left side of dash)
• Bulb test
• C1 a1
• C10
• C2 f6
• Camshaft position (cmp) sensor (4.3l)
• Cellular phone ready wiring
• Clutch pedal position switch (m/t)
• Compressor levelling module
• Compressor motor relay
• Crank fuse 10a
• Cruise control module
• Cruise control on/off switch
• Cruise fuse 10a
• D (gas) (diesel)
• Driver information center (dic)
• Drl relay
• E11
• E6 (not used)
• Emergency light relay
• Eng 1 fuse 10a
• Engine control module (ecm) (diesel)
• Engine control module (ecm)/ powertrain control module (pcm)
• Evaporative emission (evap) canister purge solenoid
• Evaporative emission (evap) canister vent solenoid
• Ext lps fuse 10a
• F10
• F11
• From cigar e
• Fuel heater (diesel)
• Fuse (diagram 1 of 4)
• Fuse block (on lower left side of dash)
• Gas only
• Heated oxygen sensor (ho2s) (bank 1 sensor 1) (gas)
• Heated oxygen sensor (ho2s) (bank 1 sensor 2) (gas)
• Heated oxygen sensor (ho2s) (bank 2 sensor 1) (gas)
• Heated oxygen sensor (ho2s) (bank 2 sensor 2) (gas)
• Ign 1 fuse 10a
• Ign a fuse 40a
• Ign b fuse 50a
• Ign c fuse 20a
• Ign e fuse 10a
• Ign o fuse 10a
• Ignition switch
• Inflatable restraint i/p module switch (pickup only)
• Inflatable restraint sensing & diagnostic module
• Inside temperature sensor assembly
• Instrument panel cluster (ipc)
• Intake air temperature (iat)/ mass air flow (maf) sensor
• Nca
• Nca c
• Nca f
• O2 a fuse 15a fuel ht fuse 15a
• O2 b fuse 15a ecm 1 fuse 10a
• Off
• Outside rearview mirror
• Park/ neutral position switch (a/t)
• Pnk
• Rear defog relay
• Rear window wiper module
• Rear wiper washer switch
• Red
• Rr hvac fuse 30a
• Rr wiper fuse 15a
• Rr wpr fuse 25a
• Rtd module fuse 30a
• Run
• Secondary air injection (air) pump relay
• Secondary fuel pump relay
• Selectable ride switch
• Seo ign fuse 10a
• Seq accy fuse 10a
• Start
• Starter relay
• Stud 1
• Stud 1 fuse 40a
• Stud 2
• Stud 2 fuse 30a
• Suspension control module
• To htr/ a/c fuse (diagram 3 of 4)
• To i/p junction block (diagram 3 of 4)
• To ign 1 relay (diagram 3 of 4)
• To retained accessory power relay (diagram 4 of 4)
• Traction assist switch
• Trailer connector
• Transfer case shift control switch
• Turn fuse 20a
• Turn signal/ multi- function switch
• Under- hood junction block (on left side of engine compt)
• Underhood junction block (on left side of engine compt)
• Vehicle interface unit (viu)
• Windshield washer switch
• Windshield wiper motor module
• Ws wiper fuse 25a

Power Distribution Wiring Diagram (3 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for Power Distribution Wiring Diagram (3 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (4.3l)
• (all other gas)
• (auto ecc)
• (base)
• (diesel)
• (diesel) (gas)
• (engine harness) s199
• (except 4.3l)
• (gas)
• (manual)
• (on lower left side of dash) fuse block
• (other pnk
• (other)
• (uplevel pickups & utilities)
• 4.3l
• 4wd fuse 15a
• A11
• Air temperature actuator
• All other gas
• Auxiliary battery relay
• B h
• B j
• B10
• Blower motor switch (manual)
• Brake fuse 10a
• C10
• C11
• C12
• C2 c1
• Clutch pedal position switch
• Compressor leveling relay relay
• D10
• Diesel
• E10
• E12
• Ecm 1 fuse 10a ecm prv fuse 15a
• Electronic brake control module (ebcm)
• Engine control module (ecm)/
• Engine control module (ecm)/ powertrain control module (pcm)
• Etc fuse 15a
• From cruise g
• From eng 1 fuse (diagram 2 of 4) from ecm b fuse (diagram 1 of 4)
• From fuse link (diagram 1 of 4)
• From ign c f
• From rr hvac fuse (diagram 2 of 4)
• Front axle actuator
• Front passenger heated seat switch
• Fuel injector 1
• Fuel injector 2
• Fuel injector 3
• Fuel injector 4
• Fuel injector 5 (all gas)
• Fuel injector 6
• Fuel injector 7 (except 4.3l)
• Fuel injector 8
• Fuse (diagram 2 of 4)
• G114 (left rear of engine)
• Gas
• Gas)
• Heater auxiliary blower motor resistor
• Htr/ a/c fuse 25a
• Hvac 1 fuse 10a
• Hvac control module
• I/p junction block (on lower right side of dash)
• Ign 1 relay
• Ign 3 fuse 10a
• Ignition coil
• Ignition coil 1
• Ignition coil 2
• Ignition coil 3
• Ignition coil 4
• Ignition coil 5
• Ignition coil 6
• Ignition coil 7
• Ignition coil 8
• Ignition coil driver
• Inj a fuse 15a
• Inj b fuse 25a 15a
• Injector control module (icm)
• Left front heated seat switch
• Left rear heated seat module
• Mega fuse 125a
• Memory seat module (except pickup)
• Memory seat module (pickup only)
• Mode actuator
• Nca
• Pnk
• Powertrain control module (pcm) (4.3l)
• Recirculation actuator
• Red
• Right battery
• Right rear heated seat module
• S104
• S152 (eng pnk harn)
• S154 (eng pnk harn)
• Stoplamp switch
• Suspension control module
• To a/c auxiliary blower motor resistor assembly (diagram 4 of 4)
• Transfer case shift control module
• Under- hood junction block (on left side of engine compt)

Power Distribution Wiring Diagram (4 of 4) for GMC Cab & Chassis Sierra 2001 3500

List of elements for Power Distribution Wiring Diagram (4 of 4) for GMC Cab & Chassis Sierra 2001 3500:

• (except pickup)
• (not used)
• (pickup only)
• (pickup)
• (utilities)
• A/c auxiliary blower motor resistor assembly
• A10
• Air temperature actuator
• Air temperature sensor
• Base
• Base pickup
• Base utility
• Body control module (bcm)
• Body junction block fuse block (under left side of dash)
• C1 b4
• C1 c9
• C1 e7
• C14
• C4 k
• C4 l
• C6 c
• C7 e
• Door lock fuse 20a
• Door lock relay
• Door unlock relay
• Driver door lock switch
• Driver door unlock relay (uplevel only)
• Driver memory seat switch
• Driver seat adjuster switch
• Driver window/ door lock switch
• F11
• From fuse block (diagram 2 of 4)
• From i/p junction block (diagram 3 of 4)
• From rap fuse d (diagram 1 of 4)
• Front auxiliary hvac control assembly
• Front passenger door lock switch
• Front passenger seat adjuster switch
• Front passenger window/ door lock switch
• Fuse block (on lower left side of dash)
• I/p junction block
• Instrument cluster & sound systems
• Left full feature seat
• Left power door lock switch
• Left power seat
• Left power window/ door lock switch
• Memory seat switch
• Mir/ lock fuse 3a
• Mode actuator
• Nca
• Outside rear view mirror switch
• Pickup
• Pwr wdo cb 25a
• Radio
• Rap 2 fuse 10a
• Rdo 1 fuse 10a
• Rear auxiliary hvac control assembly
• Rear cargo door lock switch
• Rear hvac control module
• Red
• Relays
• Retained accessory power relay
• Right full feature seat
• Right power seat
• Seats circuit breaker 25a
• To rap 2 relay (diagram 1 of 4)
• Uplevel & 4-door
• Uplevel all
• Utilities
• Utility only
• Vehicle interface unit (viu)
• W/ auto ecc
• W/ heat & a/c
• W/ heat or a/c
• W/ sunroof
• W/o sunroof

POWER DOOR LOCKS

Power Door Lock Wiring Diagram, Base for GMC Cab & Chassis Sierra 2001 3500

List of elements for Power Door Lock Wiring Diagram, Base for GMC Cab & Chassis Sierra 2001 3500:

• (lower right side of i/p) i/p junction block
• (upper left i/p, at "a" pillar)
• 87a
• A12
• B11
• B12
• Body control module (on lower left side of dash, below steering column)
• Body junction block (near left kick panel)
• C1 a11
• C1 b8
• C1 f4
• C211
• C4 a
• C4 d
• C4 m
• Door lock relay
• Door unlock relay
• Dr lk rly
• Dr lock fuse 20a
• Dr unlk rly
• Driver door lock actuator
• Driver door lock switch
• Drv dr unlk rly
• E10
• F12
• Fuse block (on lower left side of dash)
• G200
• G200 (upper left kick panel)
• Hot at all times
• Ign key sig
• Ignition key alarm switch (part of steering column assembly)
• Instrument panel cluster
• Lock
• Lock fuse 15a
• Mir/ lock fuse 3a
• Nca
• Passenger door lock actuator
• Passenger door lock switch
• Powertrain control module (left front inside of engine compartment)
• Splice pack
• Tan
• Unlock
• Unlock fuse 15a
• Unlock jmpr fuse 30a
• Vss
• Vss signal

Power Door Lock Wiring Diagram, Up Level for GMC Cab & Chassis Sierra 2001 3500

List of elements for Power Door Lock Wiring Diagram, Up Level for GMC Cab & Chassis Sierra 2001 3500:

• (lower right side of i/p) i/p junction block
• (upper left kick panel)
• 87a
• A12
• B11
• B12
• Battery
• Body control module (on lower left side of dash, below steering column)
• Body junction block (near left kick panel)
• C1 a11
• C1 a12
• C1 b8
• C1 f2
• C1 f4
• C11
• C211
• C4 a
• C4 d
• C4 m
• Door lock relay
• Door unlock relay
• Dr lock fuse 20a
• Driver door lock actuator
• Driver door unlock relay
• Driver window/door lock switch
• E10
• F10
• F12
• Fuse block (on lower left side of dash)
• G200
• G200 (upper left kick panel)
• Ground
• Hot at all times
• I/p junction block (on lower right side of i/p)
• Ign key switch
• Ignition key alarm switch (part of steering column assembly)
• Instrument panel cluster
• Lf dr unlk in
• Lock
• Lock fuse 15a
• Lock in
• Mir/lock fuse 3a
• Nca
• Passenger door lock actuator
• Passenger window/door lock switch
• Powertrain control module (left front inside of engine compartment)
• Remote control door lock receiver (behind top center of dash)
• Serial data
• Splice pack
• Srl data
• Tan
• Tbc fuse 10a
• Underhood junction block (on left side of engine compt)
• Unlock
• Unlock fuse 15a
• Unlock in
• Vss
• Vss signal

POWER MIRRORS

Electrochromic Mirror Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Electrochromic Mirror Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (behind left side of dash)
• (w/ onstar)
• (w/o onstar)
• (w/o onstar) (w/ onstar)
• A/t
• B/u lp fuse 25a
• Back-up lamp switch (on left side of trans- mission)
• Back-up lamp switch (part of park/neutral position switch) (on left side transmission)
• Body junction block
• C/m
• C1 a11
• C1 a4
• C1 b10
• C1 d8
• C1 e12
• C1 f2
• C11 a
• C11 b
• C2 a9
• C2 f
• C2 f9
• C6 a
• C6 j
• C6 m
• Compass
• Dim fd
• Dim rtn
• Driver outside rearview mirror (utility)
• Electro-chromic
• Fuse block (on lower left side of dash)
• G202
• Hot in run or start
• Ign 1 fuse 10a
• Inside rearview mirror
• M/t
• Nca
• Off
• Others
• Outside air temperature sensor (behind center grille)
• Photo sensor
• Pickup w/ compass & outside temperature
• Pnk
• Selector switch
• Temp
• Veh b/u fuse 15a

Power Mirror Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Power Mirror Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• C1 m
• C2 g
• Defogger system
• Down
• Driver outside rearview mirror
• Driver power window/ door lock switch
• Fuse block
• G200
• Heating element
• Hot at all times
• Interior lights system
• L c4
• Left
• Left/ right motor
• Memory systems
• Mir/ clock fuse 3a
• Nca
• Outside rearview mirror switch
• Passenger outside rearview mirror
• Right
• Sp203 (upper left kick panel)
• Up/ down motor

POWER SEATS

6-Way Power Seat Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6-Way Power Seat Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• A10
• Back
• Body junction block
• C14
• Driver seat adjuster switch
• Front dn
• Front up
• Fuse block (on lower left side of dash)
• Fwd
• G300 (under driver's seat)
• Hot at all times
• Passenger power seat switch
• Rear dn
• Rear up
• S307
• Seat circuit breaker 25a
• Seat front vertical motor
• Seat horizontal motor
• Seat rear vertical motor
• Tan

Front Seat Heater Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Front Seat Heater Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• Body junction block (under left side of dash, near kick panel)
• D12
• Driver heated seat relay (in driver seat)
• Driver heated seat thermistor
• Driver seat heated switch
• Driver seat heater element (seat back)
• Driver seat heater element (seat)
• Fuse block (on lower left side of dash)
• G200 (upper left kick panel)
• G203 (upper right kick panel)
• G300 (under driver's seat)
• Gnd
• Heater on ind
• Hot at all times
• Hot in run
• I/p junction block (lower right side of dash)
• Ign 3 fuse 10a
• Illum
• Interior lights system
• Left power window/ door lock switch
• Nca
• Passenger heated seat relay (in passenger seat)
• Passenger heated seat switch
• Passenger heated seat thermistor
• Passenger seat heater element (seat back)
• Passenger seat heater element (seat)
• S308
• Sensor
• Seo 2 fuse 30a
• Solid state
• Sp203
• Underhood junction block (left side of dash, near kick panel)

Lumbar Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Lumbar Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• A10
• Body junction block
• C14
• Driver lumbar/ bolster switch
• Driver seat bolster m0tor
• Driver seat lumbar m0tor
• Fuse block (on lower left side of dash)
• G300 (under driver's seat)
• Hot at all times
• Out
• Pass- enger lumbar/ bolster switch
• Passenger seat bolster m0tor
• Passenger seat lumbar m0tor
• Pnk
• Power seats circuit
• S308
• S309
• S310
• S311
• Seat circuit breaker 25a
• Tan

POWER WINDOWS

Power Window Wiring Diagram, 2 Door for GMC Cab & Chassis Sierra 2001 3500

List of elements for Power Window Wiring Diagram, 2 Door for GMC Cab & Chassis Sierra 2001 3500:

• Down
• Driver window motor
• Driver window/ door lock switch
• Fuse block (on lower left side of dash)
• G200 (upper left kick panel)
• Hot in acc, run, bulb test, start & with rap relay energized
• I/p junction block (on lower right side of dash)
• Interior lights system
• Left down
• Left up
• Passenger window motor
• Passenger window/ door lock switch
• Pwr wdo circuit breaker 25a
• Right down
• Right up
• Splice pack sp203
• Tan
• Wdo dn relay
• Wdo up relay

Power Window Wiring Diagram, 4 Door for GMC Cab & Chassis Sierra 2001 3500

List of elements for Power Window Wiring Diagram, 4 Door for GMC Cab & Chassis Sierra 2001 3500:

• B12
• D12
• Down
• Driver window motor
• Driver window switch
• Front passenger window motor
• Front passenger window switch
• Fuse block (on lower left side of dash)
• G200 (upper left kick panel)
• G203 (upper right kick panel)
• G305 (right "b" pillar)
• G308 (left "b" pillar)
• Hot in acc, run, bulb test or w/rap relay energized
• Hot in acc, run, bulb test, start or w/rap relay energized
• I/p junction block (on lower right side of dash)
• Interior lights system
• Left front down
• Left front up
• Left rear down
• Left rear up
• Left rear window motor
• Left rear window switch
• Lockout
• Pwr wdo circuit breaker 25a
• Right front down
• Right front up
• Right rear down
• Right rear up
• Right rear window motor
• Right rear window switch
• Splice pack sp203
• Tan
• Window down relay
• Window up relay

RADIO

Radio Wiring Diagrams for GMC Cab & Chassis Sierra 2001 3500

List of elements for Radio Wiring Diagrams for GMC Cab & Chassis Sierra 2001 3500:

• Antenna
• Audio rtn
• Bare
• Base
• Battery
• Body junction block (near left kick panel)
• Cd player- remote play- back device
• Cruise control module
• D10
• D12
• Dim sig in
• Dim sig out
• Dimmer
• Drain
• E&c line
• Fuse block (on lower left side of dash)
• G200 (upper left kick panel)
• Ground
• Hot at all times
• Hot with rap relay energized
• I/p lamp
• Ignition
• Instrument cluster
• Interior lights system
• J c4
• Left front door speaker
• Left rear door speaker (crew cab) left rear speaker (except crew cab)
• Lf +
• Lf -
• Lr +
• Lr -
• Lt input
• Lt output
• Nca
• Pnk
• Powertrain control module (left front of engine compt)
• Premium
• R14 in
• R14 out
• Radio
• Radio fuse 15a
• Rdo i fuse 10a
• Rf +
• Rf -
• Right front door speaker
• Right rear door speaker (crew cab) right rear speaker (except crew cab)
• Rr +
• Rr -
• Rt input
• Rt output
• Sp203
• Tan
• Underhood junction block (on left side of engine compt)
• Vss signal

SHIFT INTERLOCKS

Shift Interlock Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Shift Interlock Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (upper left kick panel)
• A/t shift lock control solenoid (on steering column)
• A16
• A17
• B/u lps fuse 25a
• Btsi fuse 10a
• G200
• Hot in run or start
• Memory systems
• Nca
• Park/ neutral position switch (left side of transmission)
• Pnk
• Splice pack
• Stoplamp switch (top of brake pedal)
• Underhood junction block

STARTING/CHARGING

6.0L

6.0L VIN U, Charging Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.0L VIN U, Charging Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (2001 only)
• (left radiator support bracket) g108
• (not used)
• (on left front side of engine) battery cable junction block
• (right front of engine) g119
• 4.3l engine
• All other engines
• Battery
• Body wiring harness junction block (under left side of dash, near kick panel)
• Charge indicator control
• Computer data lines
• Fuse block (on lower left side of dash)
• G117 (right rear of engine)
• Generator
• Generator field duty cycle signal
• Hot in run & start
• Ign 1 fuse 10a
• Instrument cluster
• Left battery
• Message center
• Pnk
• Power distribution system
• Powertrain control module (pcm) or vehicle control module (vcm) (on left front of engine compartment)
• Red
• Serial data class 2
• Solid state
• Splice pack (sp205) (on left side of dash behind headlamp switch)
• Starter solenoid
• Voltmeter

Starting Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Starting Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness) s102
• (not used)
• (right front of engine block) g132
• 87a
• A/t
• Acc
• Battery cable junction block (on left front side of engine)
• Body wiring harness junction block (under left side of dash, near kick panel)
• C10
• Clutch pedal position switch (on top of clutch pedal bracket)
• Crank fuse 10a
• D11
• D12
• F10
• F11
• Fuse block (on lower left side of dash)
• G108 (left radiator support bracket)
• G119 (right front of engine)
• Ign a fuse 40a
• Ign c fuse 20a
• Ignition switch
• Left battery
• Lock
• M/t
• Nca
• Off
• Park/neutral position switch (on left side of transmission)
• Power distribution system
• Red
• Run
• Start
• Starter motor
• Starter motor relay
• Starter solenoid
• Starting/ charging system (charging circuit) (generator left)
• Starting/ charging system (charging circuit) (generator right) (diesel dual generator)
• Underhood junction block (at left side of engine compartment, near battery)

6.6L

6.6L VIN 1, Charging Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, Charging Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (not used)
• (on left front side of engine) battery cable junction block
• Battery
• Body wiring harness junction block (under left side of dash, near kick panel)
• Charge indicator control
• Computer data lines
• Field duty cycle signal
• Fuse block (on lower left side of dash)
• G108 (left radiator support bracket)
• G117 (right rear of engine)
• G119 (right front of engine)
• Hot in run & start
• Ign 1 fuse 10a
• Instrument cluster
• Left battery
• Left generator
• Message center
• Pnk
• Power distribution system
• Powertrain control module (pcm) (on left front of engine compartment)
• Red
• Right generator
• Serial data class 2
• Solid state
• Splice pack (sp205) (on left side of dash behind headlamp switch)
• Starter solenoid
• Voltmeter

Starting Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Starting Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness) s102
• (not used)
• (right front of engine block) g132
• 87a
• A/t
• Acc
• Battery cable junction block (on left front side of engine)
• Body wiring harness junction block (under left side of dash, near kick panel)
• C10
• Clutch pedal position switch (on top of clutch pedal bracket)
• Crank fuse 10a
• D11
• D12
• F10
• F11
• Fuse block (on lower left side of dash)
• G108 (left radiator support bracket)
• G119 (right front of engine)
• Ign a fuse 40a
• Ign c fuse 20a
• Ignition switch
• Left battery
• Lock
• M/t
• Nca
• Off
• Park/neutral position switch (on left side of transmission)
• Power distribution system
• Red
• Run
• Start
• Starter motor
• Starter motor relay
• Starter solenoid
• Starting/ charging system (charging circuit) (generator left)
• Starting/ charging system (charging circuit) (generator right) (diesel dual generator)
• Underhood junction block (at left side of engine compartment, near battery)

8.1L

8.1L VIN G, Charging Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for 8.1L VIN G, Charging Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (2001 only)
• (left radiator support bracket) g108
• (not used)
• (on left front side of engine) battery cable junction block
• (right front of engine) g119
• 4.3l engine
• All other engines
• Battery
• Body wiring harness junction block (under left side of dash, near kick panel)
• Charge indicator control
• Computer data lines
• Fuse block (on lower left side of dash)
• G117 (right rear of engine)
• Generator
• Generator field duty cycle signal
• Hot in run & start
• Ign 1 fuse 10a
• Instrument cluster
• Left battery
• Message center
• Pnk
• Power distribution system
• Powertrain control module (pcm) or vehicle control module (vcm) (on left front of engine compartment)
• Red
• Serial data class 2
• Solid state
• Splice pack (sp205) (on left side of dash behind headlamp switch)
• Starter solenoid
• Voltmeter

Starting Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Starting Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness) s102
• (not used)
• (right front of engine block) g132
• 87a
• A/t
• Acc
• Battery cable junction block (on left front side of engine)
• Body wiring harness junction block (under left side of dash, near kick panel)
• C10
• Clutch pedal position switch (on top of clutch pedal bracket)
• Crank fuse 10a
• D11
• D12
• F10
• F11
• Fuse block (on lower left side of dash)
• G108 (left radiator support bracket)
• G119 (right front of engine)
• Ign a fuse 40a
• Ign c fuse 20a
• Ignition switch
• Left battery
• Lock
• M/t
• Nca
• Off
• Park/neutral position switch (on left side of transmission)
• Power distribution system
• Red
• Run
• Start
• Starter motor
• Starter motor relay
• Starter solenoid
• Starting/ charging system (charging circuit) (generator left)
• Starting/ charging system (charging circuit) (generator right) (diesel dual generator)
• Underhood junction block (at left side of engine compartment, near battery)

SUPPLEMENTAL RESTRAINTS

Supplemental Restraint Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Supplemental Restraint Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• A10
• A11
• A12
• A13
• A14
• A15
• A16
• A17
• A18
• Air bag fuse 15a
• Air bag indicator
• Class 2 serial data
• Data link connector (dlc) (partial) (under left side of dash, below steering column)
• Disable signal
• Fuse block (on lower left side of dash)
• G202
• Ground
• High control
• Hot in run & start
• Ign 1 fuse 10a
• Ignition
• Indicator control
• Inflatable restraint electronic frontal sensor (efs) (under front center of vehicle, near radiator support frame)
• Inflatable restraint i/p module disable switch
• Inflatable restraint ip module
• Inflatable restraint sensing & diagnostic module (under driver's seat)
• Inflatable restraint steering wheel module
• Inflatable restraint steering wheel module coil
• Instrument panel cluster (ipc)
• Interior lights system
• Junction block-body (under left side of dash, near left kick panel)
• Low control
• Nca
• Off
• Pnk
• Sensor ground
• Sensor signal
• Shorting bar
• Solid state
• Splice pack 205 (sp205) (on left side of dash, behind headlamp switch)
• Splice pack sp203 (sp203) (on top left side of dash, near "a" pillar)

TRANSMISSION

6.0L

6.0L VIN U, A/T Wiring Diagram, 4L80-E for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.0L VIN U, A/T Wiring Diagram, 4L80-E for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness)
• (not used) a
• (right rear of engine block) g103
• +5v
• 1-2 shift solenoid
• 1-2 ss
• 2-3 shift solenoid
• 2-3 ss
• 4wd circuit (transfer case & front axle switch)
• 4wd low
• A/t fluid pressure manual valve position switch
• A/t ss
• A12
• Abs system
• Automatic transmission (4l80-e)
• Automatic transmission input shaft speed sensor (4wd) (on transmission)
• Body control module (lower left side of dash, below steering column)
• Body relay block (under c1
• Brake fuse 10a
• Brk sw
• C11
• Cls 2 data
• D3, d2
• D4, d2
• Data link connector (under left side of dash)
• Ecm1 fuse 10a
• Ecmb fuse 20a
• Ect sig
• Engine coolant temperature sensor (front of left cylinder head)
• Except light duty w/ delphi ho2s
• Fluid temp sensor
• Frt axle sw
• G103 (right rear of engine block)
• Gnd
• Hot at all times
• Hot in run
• Hot in run & start
• Hot in run, bulb test & start
• Ign
• Ign0 fuse 10a
• Ign1 fuse 10a
• Instrument cluster
• Instrument panel cluster (ipc)
• Left end of dash)
• Left i/p fuse block (lower left side of dash)
• Light duty w/ delphi ho2s
• Lo ref
• Malfunction indicator lamp
• Mil ctrl
• Park/neutral position switch (left side of transmission)
• Pc sol hi
• Pc sol lo
• Pnk
• Powertrain control module (left front of engine compt)
• Press ctrl solenoid
• Prnd a
• Prnd b
• Prnd c
• Prnd p
• Range b
• Range c
• Red
• Red a
• Rev, lo
• S103
• S113
• Sens gnd
• Splice pack sp205 (left side of dash)
• Stoplight switch (top of brake pedal bracket)
• Tcc pwm
• Tcc pwm solenoid
• Tft sens sig
• Throttle position sensor (on throttle body assy)
• Tp sig
• Trans rng a
• Underhood fuse block (left side of engine c2 compt, near battery)
• Underhood fuse block (left side of engine compt, near battery)
• Vehicle speed sensor (2wd: left rear of transmission) (4wd: left side of transfer case)
• Vss adapter (4wd) (left side of trans)
• Vss hi
• Vss lo
• W/ traction assist
• W/o traction assist

Transfer Case Wiring Diagram, Selectable for GMC Cab & Chassis Sierra 2001 3500

List of elements for Transfer Case Wiring Diagram, Selectable for GMC Cab & Chassis Sierra 2001 3500:

• (left front of engine compt) (w/ allison trans) transmission control module
• (left front of engine compt) powertrain control module (gas engines) or engine control module (diesel)
• (on left front body mount) g110
• (under left side of dash) data link connector
• (w/ allison transmission)
• +8v ref
• +8v ref out
• 2-hi ind
• 4-hi ind
• 4-lo ind
• 4wd fuse 15a
• 4wd ind lamp
• 4wd sw (lo)
• 4wd sw sig
• 4wd whl lock
• Atc fuse 20a
• Auxiliary battery relay
• Body relay block (under c1
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Channel-a
• Channel-b
• Channel-c
• Channel-p
• Class ii data
• Ctrl
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Dsl (ecm) gas (pcm)
• Encoder logic
• Encoder motor
• Encoder rtn
• Front axle actuator
• Ft axle ctrl
• G110 (on left front body mount)
• G203 (upper left kick panel)
• Gnd
• Hot at all times
• Hot in run
• Hot in run & start
• Ign 3 (run)
• Ign1 fuse 10a
• Illumination lamp (2)
• Instrument panel cluster
• Interior lights system
• Left i/p fuse block (lower left side of dash)
• Left side of dash)
• Logic
• Module gnd
• Motor (ccw)
• Motor (cw)
• Nca
• Neutral ind
• Pnk
• Red
• S165 (in engine harness)
• Shift motor
• Solid state
• Splice pack sp203
• Splice pack sp205 (left side of dash)
• Transfer case shift control module (behind headlamp switch)
• Transfer case shift control switch
• Underhood fuse block (left side of engine compt, near battery)

6.6L

6.6L VIN 1, A/T Wiring Diagram, Allison for GMC Cab & Chassis Sierra 2001 3500

List of elements for 6.6L VIN 1, A/T Wiring Diagram, Allison for GMC Cab & Chassis Sierra 2001 3500:

• (left front of engine block) g105
• 12 volt ref
• 4wd circuit (transfer case controls)
• 4wd low sig
• A4 c1
• Allison transmission
• Battery
• Body relay block (under left end of dash)
• Brake fuse 10a
• C1 d8
• C1 vss adapter (4wd) (left side of trans)
• C9 c1
• Can data hi
• Can data high
• Can data lo
• Can data low
• Class 2 data
• Class 2 serial data
• Data link connector (under left side of dash)
• Driver information center
• Ecm b fuse 20a
• Engine control module (left front of engine compt)
• Exterior lights system
• Force motor solenoids
• G103 (right front of engine block)
• Ground
• Hot at all times
• Hot in run
• Hot in run & start
• Ign 0 fuse 10a
• Ignition
• Input speed sensor
• Instrument panel cluster (ipc)
• Iss high
• Iss low
• Left i/p fuse block (lower left side of dash)
• Low ref
• Malfunction indicator lamp
• Mil control
• Mil signal
• On/off sol a
• On/off sol b
• On/off sol c
• On/off solenoids
• Park/neutral position switch (left side of transmission)
• Pcs a high
• Pcs a low
• Pcs b high
• Pcs b low
• Pnk
• Pressure switch manifold
• Red
• Rev
• Reverse sig
• S103
• Sig hi-front
• Signal high - front
• Splice pack sp205 (left side of dash)
• Stoplamp switch (on brake pedal bracket)
• Sump temper- ature sensor
• Tcc brake sw
• Tcc lockup solenoid
• Tcc pwm
• Tcc sol
• Tfp signal a
• Tfp signal b
• Tfp signal c
• Tft signal
• Tr signal a
• Tr signal b
• Tr signal c
• Tr signal p
• Trans id
• Trans mil request
• Transmission control module (left front of engine compt)
• Tss return
• Tss signal
• Turbine speed sensor
• Underhood fuse block (left side of engine compt, near battery)
• Vehicle speed sensor (2wd: left rear of transmission) (4wd: left side of transfer case)
• Vss high
• Vss low

Transfer Case Wiring Diagram, Selectable for GMC Cab & Chassis Sierra 2001 3500

List of elements for Transfer Case Wiring Diagram, Selectable for GMC Cab & Chassis Sierra 2001 3500:

• (left front of engine compt) (w/ allison trans) transmission control module
• (left front of engine compt) powertrain control module (gas engines) or engine control module (diesel)
• (on left front body mount) g110
• (under left side of dash) data link connector
• (w/ allison transmission)
• +8v ref
• +8v ref out
• 2-hi ind
• 4-hi ind
• 4-lo ind
• 4wd fuse 15a
• 4wd ind lamp
• 4wd sw (lo)
• 4wd sw sig
• 4wd whl lock
• Atc fuse 20a
• Auxiliary battery relay
• Body relay block (under c1
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Channel-a
• Channel-b
• Channel-c
• Channel-p
• Class ii data
• Ctrl
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Dsl (ecm) gas (pcm)
• Encoder logic
• Encoder motor
• Encoder rtn
• Front axle actuator
• Ft axle ctrl
• G110 (on left front body mount)
• G203 (upper left kick panel)
• Gnd
• Hot at all times
• Hot in run
• Hot in run & start
• Ign 3 (run)
• Ign1 fuse 10a
• Illumination lamp (2)
• Instrument panel cluster
• Interior lights system
• Left i/p fuse block (lower left side of dash)
• Left side of dash)
• Logic
• Module gnd
• Motor (ccw)
• Motor (cw)
• Nca
• Neutral ind
• Pnk
• Red
• S165 (in engine harness)
• Shift motor
• Solid state
• Splice pack sp203
• Splice pack sp205 (left side of dash)
• Transfer case shift control module (behind headlamp switch)
• Transfer case shift control switch
• Underhood fuse block (left side of engine compt, near battery)

8.1L

8.1L VIN G, A/T Wiring Diagram, Allison for GMC Cab & Chassis Sierra 2001 3500

List of elements for 8.1L VIN G, A/T Wiring Diagram, Allison for GMC Cab & Chassis Sierra 2001 3500:

• (in engine harness) s164
• (right rear of engine block) g103
• 12 volt ref
• 4wd circuit (transfer case controls)
• 4wd low sig
• A4 c1
• Allison transmission
• Battery
• Body relay block (under left end of dash)
• Brake fuse 10a
• C1 c9
• C1 d8
• C1 vss adapter (4wd) (left side of trans)
• Class 2 data
• Class 2 serial data
• Data link connector (under left side of dash)
• Delivd torque
• Delivered torque sig
• Driver information center
• Ecm b fuse 20a
• Engine controls system (power take off switch)
• Exterior lights system
• Force motor solenoids
• Ground
• Hot at all times
• Hot in run
• Hot in run & start
• Ign 0 fuse 10a
• Ignition
• Input speed sensor
• Instrument panel cluster (ipc)
• Iss high
• Iss low
• Left i/p fuse block (lower left side of dash)
• Low ref
• Malfunction indicator lamp
• Mil control
• Mil signal
• On/off sol a
• On/off sol b
• On/off sol c
• On/off solenoids
• Orn
• Park/neutral position switch (left side of transmission)
• Pcs a high
• Pcs a low
• Pcs b high
• Pcs b low
• Pnk
• Powertrain control module (left front of engine compt)
• Pressure switch manifold
• Pto status
• Red
• Reqst torque
• Requested torque sig
• Rev
• Reverse sig
• S103
• Sig hi-front
• Signal high - front
• Splice pack sp205 (left side of dash)
• Stoplamp switch (on brake pedal bracket)
• Sump temper- ature sensor
• Tcc brake sw
• Tcc lockup solenoid
• Tcc pwm
• Tcc sol
• Tfp signal a
• Tfp signal b
• Tfp signal c
• Tft signal
• Torque response sig
• Tr signal a
• Tr signal b
• Tr signal c
• Tr signal p
• Trans id
• Trans mil request
• Transmission control module (left front of engine compt)
• Trq response
• Tss return
• Tss signal
• Turbine speed sensor
• Underhood fuse block (left side of engine compt, near battery)
• Vehicle speed sensor (2wd: left rear of transmission) (4wd: left side of transfer case)
• Vss high
• Vss low

Transfer Case Wiring Diagram, Selectable for GMC Cab & Chassis Sierra 2001 3500

List of elements for Transfer Case Wiring Diagram, Selectable for GMC Cab & Chassis Sierra 2001 3500:

• (left front of engine compt) (w/ allison trans) transmission control module
• (left front of engine compt) powertrain control module (gas engines) or engine control module (diesel)
• (on left front body mount) g110
• (under left side of dash) data link connector
• (w/ allison transmission)
• +8v ref
• +8v ref out
• 2-hi ind
• 4-hi ind
• 4-lo ind
• 4wd fuse 15a
• 4wd ind lamp
• 4wd sw (lo)
• 4wd sw sig
• 4wd whl lock
• Atc fuse 20a
• Auxiliary battery relay
• Body relay block (under c1
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Channel-a
• Channel-b
• Channel-c
• Channel-p
• Class ii data
• Ctrl
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Dsl (ecm) gas (pcm)
• Encoder logic
• Encoder motor
• Encoder rtn
• Front axle actuator
• Ft axle ctrl
• G110 (on left front body mount)
• G203 (upper left kick panel)
• Gnd
• Hot at all times
• Hot in run
• Hot in run & start
• Ign 3 (run)
• Ign1 fuse 10a
• Illumination lamp (2)
• Instrument panel cluster
• Interior lights system
• Left i/p fuse block (lower left side of dash)
• Left side of dash)
• Logic
• Module gnd
• Motor (ccw)
• Motor (cw)
• Nca
• Neutral ind
• Pnk
• Red
• S165 (in engine harness)
• Shift motor
• Solid state
• Splice pack sp203
• Splice pack sp205 (left side of dash)
• Transfer case shift control module (behind headlamp switch)
• Transfer case shift control switch
• Underhood fuse block (left side of engine compt, near battery)

WARNING SYSTEMS

Warning System Wiring Diagrams for GMC Cab & Chassis Sierra 2001 3500

List of elements for Warning System Wiring Diagrams for GMC Cab & Chassis Sierra 2001 3500:

• (on lower left side of dash, below steering column) body control module
• A11
• A12
• B10
• B11
• Base
• Battery
• Body junction block
• Body wiring harness junction block (under left side of dash, near kick panel)
• C1 f2
• C10
• C11
• Cgo dr jmb sw in
• Cruise fuse 10a
• Door jamb sw in
• Exterior lights
• F10
• Fuse block
• G200 (upper left kick panel)
• G300 (under driver's seat)
• G998 (rear corner of right rear window)
• Ground
• Hdlmp rly cntrl
• Headlamp & panel dimmer switch
• Hot at all times
• Hot in run
• Hot in run or start
• Hot with park lights on
• Ign 1 fuse 10a
• Ignition 1
• Ignition 3
• Instrument cluster
• Int prk fuse 10a
• Key in ign
• Key-in ignition switch
• Left cargo door ajar switch
• Left door contactor
• Left liftgate ajar switch
• Left mini wedge switch
• Left power window/ door lock switch
• Left turn input
• Liftglass ajar switch
• Logic
• Nca
• Park lights in
• Pnk
• Pnk/
• Powertrain control module (pcm) (left front of engine compartment)
• Rear window wiper module
• Right cargo door ajar switch
• Right door contactor
• Right liftgate ajar switch
• Right turn input
• S410
• S411
• Seat belt ind
• Seat belt input
• Seat belt switch (on driver's seat belt buckle)
• Serial data
• Sp203
• Sp205 (left side of dash)
• Sp410
• Tan
• Tbc fuse 10a
• Turn signal/ mulitfunction switch
• Underhood junction block
• Uplevel
• Utility w/cargo doors
• Utility w/o cargo doors

WIPER/WASHER

Front Wiper/Washer Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500

List of elements for Front Wiper/Washer Wiring Diagram for GMC Cab & Chassis Sierra 2001 3500:

• (in forward lamp harness) s100
• (left front of engine) g110
• (left radiator support bracket) g108
• 24,000 ohms
• Fuse block (on lower left side of dash)
• High
• Hot in acc & run
• Lo pulse
• Mist
• Mux 1
• Mux 2
• Nca
• Off
• Pnk
• Pulse
• Red
• Resistance values: minimum delay; 39,000, 82,000, 150,000, 270,000 maximum delay; 680,000
• Underhood junction block (at left side of engine compartment, near battery)
• W/w pmp fuse 15a
• Wash
• Windshield washer pump (in washer fluid reservoir)
• Windshield wiper motor module (under cowl, near wiper arms)
• Windshield wiper/ washer switch
• Ws wiper fuse 25a