Diagram sections — 27 (68 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT BODY CONTROL MODULES COMPUTER DATA LINES CRUISE CONTROL DEFOGGERS ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER WINDOWS RADIO SHIFT INTERLOCK STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION TRUNK, TAILGATE, FUEL DOOR WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING Compressor Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Compressor Wiring Diagram for Chevrolet Chevy Express G2008 3500: 38 4.3l 4.8l, 5.3l & 6.0l 5v ref 6.6l A/c cmprsr fuse 57 15a A/c compressor clutch (4.3l: at left front of engine) (4.8l, 5.3l & 6.0l: at lower right front of engine) (6.6l: top front of engine) A/c comprsr relay 74 A/c low pressure switch (on side of accumulator) A/c refrigerant pressure sensor A/c request sig Bi-lev Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Clutch rly ctrl Computer data lines system Def Engine control module (ecm) (left side of engine compt) G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine) G304 (behind right kick panel) Gmlan (+) Gmlan (-) Heat Heat/def Hot at all times Hot in run Hvac 2 fuse 1 10a Hvac control assembly J102 J249 Logic Low ref Max norm Off Press sens Tan Underhood fuse block (on left side of engine compt) Vent W/ electric rear window defogger & power mirrors Heater Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Heater Wiring Diagram for Chevrolet Chevy Express G2008 3500: 77 (in body harness, attached to lower left "b" pillar) jx347 (in chassis harness, 15 cm from coolant heater breakout) j119 (left rear of passenger 12v ref 5v ref Air temperature actuator (behind right side of dash, on hvac) Auxiliary blower motor (if equipped) (on auxiliary hvac) Auxiliary blower motor resistor (if equipped) (on auxiliary heater motor) Auxiliary blower motor switch (if equipped) Auxiliary high speed blower motor relay (if equipped) (left rear of passenger compt, attached to hvac module) Auxiliary low speed blower motor relay (if equipped) Auxiliary medium speed blower motor relay (if equipped) (left rear of passenger compt, attached to auxiliary hvac module) Bi-lev Blower motor (on right rear of engine compt, on evaporator case) Blower motor relay Blower motor resistor assembly (at right rear of engine compt, on evaporator case) Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Compt, attached to auxiliary hvac module) Computer data lines system Coolant heater (6.6l w/ auxiliary fuel fired heater) (attached to the left front inner frame rail) Coolant heater air temperature sensor Coolant heater blower motor Coolant heater combustion sensor Coolant heater control module Coolant heater fuel pump (attached to the left inner frame rail, near the fuel pump assembly) Coolant heater glow plug Coolant heater overheat temperature sensor Coolant heater temperature sensor Def Electronic brake control module (ebcm) (on left frame rail, near center of vehicle) Foh mdl (d) fuse 14 15a Frt blwr fuse 66 40a Fuel pump G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine) G102 (left front lower side of the engine block) G304 (behind right kick panel) G347 G400 (on inner left rear frame rail) G402 (on top of Gnd Heat Heat/def Hot at all times Hot in run Hvac 1 fuse 5 20a Hvac 2 fuse 1 10a Hvac control assembly Interior Interior lights system J102 J249 J401 J402 J405 J412 J413 (in rear hvac harness, 24 cm from auxiliary blower motor breakout) Left "d" pillar) Lights system Logic Low ref Max Med Norm Off Rear blwr fuse 37 30a Red Ser data Serial + Serial - Tan Underhood fuse block (on left side of engine compt) Vacuum pump (6.6l) (right front of engine compt, under battery) Vent Volt W/ auxiliary fuel fired heater W/o auxiliary fuel fired heater Manual A/C Wiring Diagram, Cargo Van (1 of 3) for Chevrolet Chevy Express G2008 3500 List of elements for Manual A/C Wiring Diagram, Cargo Van (1 of 3) for Chevrolet Chevy Express G2008 3500: 41 (behind right kick panel) g304 (behind right side of dash, on hvac) air temperature actuator Bi-lev Blower motor (on right rear of engine compt, on evaporator case) Blower motor relay Blower motor resistor assembly (at right rear of engine compt, on evaporator case) Body fuse block (under left front seat) Def Defogger control ind Defogger switch Defogger system Front auxiliary hvac control assembly Frt blwr fuse 66 40a G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine) G102 (left front lower side of the engine block) G348 Heat Heat/def Hot at all times Hot in run Hvac 1 fuse 5 20a Hvac 2 fuse 1 10a Hvac cntrl fuse 12 10a Hvac control assembly Interior lights system J102 J249 J314 Jx348 (attached to lower right "b" pillar part of g348) Logic Max Med Norm Off Rear blwr fuse 37 30a Red Tan Underhood fuse block (on left side of engine compt) Vacuum pump (6.6l) (right front of engine compt, under battery) Vent W/ electric rear window defogger & power mirrors Manual A/C Wiring Diagram, Cargo Van (2 of 3) for Chevrolet Chevy Express G2008 3500 List of elements for Manual A/C Wiring Diagram, Cargo Van (2 of 3) for Chevrolet Chevy Express G2008 3500: 46 (attached to the left inner frame rail, near the fuel pump assembly) coolant heater fuel pump (in rear hvac harness, 13 cm from auxiliary blower motor connector breakout) j405 (w/o rv dufitter: in body harness, 31 cm from x304 breakout) (w/ rv dufitter: in body harness, 32 cm from x308 breakout) 5v ref A/c low pressure switch (on side of accumulator) Auxiliary air temperature actuator Auxiliary blower motor (on auxiliary hvac) Auxiliary blower motor resistor (on auxiliary heater motor) Auxiliary high speed blower motor relay (left rear of passenger compt, attached to hvac module) Auxiliary low speed blower motor relay (left rear of passenger compt, attached to auxiliary hvac module) Auxiliary medium speed blower motor relay (left rear of passenger compt, attached to auxiliary hvac module) Auxiliary mode actuator Computer data lines system Coolant heater (6.6l w/ auxiliary fuel fired heater) (attached to the left front inner frame rail) Coolant heater air temperature sensor Coolant heater blower motor Coolant heater combustion sensor Coolant heater control module Coolant heater glow plug Coolant heater overheat temperature sensor Coolant heater temperature sensor Foh mdl (d) fuse 14 15a Fuel pump G400 (on inner left rear frame rail) G402 (on top of Gnd Hot at all times J308 (w/o rv upfitter: in body harness, 5 cm from x304 breakout) (w/ rv upfitter: in body harness, 22 cm from x308 breakout) J310 J311 (w/o rv upfitter: in body harness, 41 cm from x304 breakout) (w/ rv upfitter: in body harness, 22 cm from x308 breakout) J402 J411 J412 (in rear hvac harness, 20 cm from auxiliary blower motor connector breakout) J413 (in rear hvac harness, 24 cm from auxiliary blower motor breakout) Left "d" pillar) Logic Low ref Provisional Serial + Serial - Serial data Tan Underhood fuse block (on left side of engine compt) Volt Volt + X319 Manual A/C Wiring Diagram, Cargo Van (3 of 3) for Chevrolet Chevy Express G2008 3500 List of elements for Manual A/C Wiring Diagram, Cargo Van (3 of 3) for Chevrolet Chevy Express G2008 3500: 39 (4.3l: at left front of engine) (4.8l, 5.3l & 6.0l: at lower right front of engine) (6.6l: top front of engine) a/c compressor clutch (in chassis harness, 15 cm from coolant heater breakout) j119 + - gmlan data 12v ref 4.3l 4.8l, 5.3l & 6.0l 5v ref 5v ref 1 6.6l A/c cmprsr fuse 57 15a A/c comprsr relay 74 A/c refrigerant pressure sensor A/c request sig Body control module (bcm) (behind lower right side of dash) Clutch ctrl Clutch rly ctrl Computer data lines system Electronic brake control module (ebcm) (on left frame rail, near center of vehicle) Engine control module (ecm) (left side of engine compt) Engine coolant temperature (ect) sensor (4.8l, 5.3l & 6.0l: at left front of engine) (4.3l: on left side of engine) (6.6l turbo: top of engine, near thermostat housing) Engine cooling fan (6.6l) (behind radiator) Fan cltch (d) fuse 58 10a Fan cltch (d) relay 75 (6.6l) G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine) G102 (left front lower side of the engine block) Gmlan (+) Gmlan (-) Hot at all times Hot w/ pwr/trn relay energized J102 Low ref Press sens Sens sig Serial data Speed sig Tan Underhood fuse block (on left side of engine compt) W/ auxiliary fuel fired heater W/o auxiliary fuel fired heater Manual A/C Wiring Diagram, Passenger Van (1 of 3) for Chevrolet Chevy Express G2008 3500 List of elements for Manual A/C Wiring Diagram, Passenger Van (1 of 3) for Chevrolet Chevy Express G2008 3500: 68 (19 cm from x303 breakout) (39 cm from x303 breakout) (4.3l: in engine harness, 6 cm from generator connector breakout) (4.8l, 5.3l & 6.0l: in engine harness, 8 cm from knock sensor breakout) (6.6l: in the engine chassis harness, 5 cm (1.96 in) from the maf sensor breakout) (64 cm from x303 breakout) (behind right kick panel) g304 (behind right side of dash, on hvac) air temperature actuator (in front headliner harness, 52 cm from x304 breakout) (in the engine chassis harness, 5 cm (1.96 in) from the maf sensor breakout) j102 (in vanity mirror lamp harness, 34 cm from front courtesy & reading lamp connector breakout) Auxiliary hvac control module (w/ rv upfitter & swb passenger) (center front of headliner) Bi-lev Blower motor (on right rear of engine compt, on evaporator case) Blower motor relay Blower motor resistor assembly (at right rear of engine compt, on evaporator case) Body fuse block (under left front seat) Def Defogger ind Defogger switch Defogger system Front auxiliary hvac control assembly Frt blwr fuse 66 40a Frt blwr sw ctrl Frt mode dr ctrl Frt temp dr ctrl G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine) G102 (left front lower side of the engine block) G348 G401 (on top of right "d" pillar) Gnd Heat Heat/def Hot at all times Hot in run Hvac 1 fuse 5 20a Hvac 2 fuse 1 10a Hvac cntrl fuse 12 10a Hvac control assembly Ign Interior lights system J102 J249 (in dash harness, 5 cm from inflatable restraint i/p module connector breakout) J305 J306 J307 J314 J354 Jx348 (attached to lower right "b" pillar part of g348) Logic Max Med Mode dr ctrl Norm Off Rear Rear auxiliary hvac control assembly Rear blwr fuse 37 30a Rear blwr sw ctrl Rear mode dr ctrl Rear temp dr ctrl Red Tan Temp dr ctrl Underhood fuse block (on left side of engine compt) Vacuum pump (6.6l) (right front of engine compt, under battery) Vent W/ electric rear window defogger & power mirrors W/ rv upfitter W/o rv upfitter Manual A/C Wiring Diagram, Passenger Van (2 of 3) for Chevrolet Chevy Express G2008 3500 List of elements for Manual A/C Wiring Diagram, Passenger Van (2 of 3) for Chevrolet Chevy Express G2008 3500: 49 (6 cm from auxiliary blower motor connector breakout) j411 (attached to the left (attached to the left inner frame rail, near the fuel pump assembly) coolant heater fuel pump (in rear hvac harness, 13 cm from auxiliary blower motor connector breakout) j405 (passenger: in chassis harness, 16 cm from g400 breakout) (cutaway: in chassis harness, 24 cm from g400 breakout) j402 (w/o rv upfitter: in body harness, 31 cm from x304 breakout) (w/ rv upfitter: in body harness, 32 cm from x308 breakout) (w/o rv upfitter: in body harness, 41 cm from x304 breakout) (w/ rv upfitter: in body harness, 22 cm from x308 breakout) 5v ref A/c low pressure switch (on side of accumulator) Auxiliary air temperature actuator (on auxiliary hvac assembly) Auxiliary blower motor (on auxiliary hvac) Auxiliary blower motor high speed relay (left rear of passenger compt, attached to hvac module) Auxiliary blower motor low speed relay (left rear of passenger compt, attached to auxiliary hvac module) Auxiliary blower motor medium speed relay (left rear of passenger compt, attached to auxiliary hvac module) Auxiliary blower motor resistor (on auxiliary heater motor) Auxiliary mode actuator Computer data lines system Coolant heater (6.6l w/ auxiliary fuel fired heater) Coolant heater air temperature sensor Coolant heater blower motor Coolant heater combustion sensor Coolant heater control module Coolant heater glow plug Coolant heater overheat temperature sensor Coolant heater temperature sensor Foh mdl (d) fuse 14 15a Front inner frame rail) Fuel pump G400 (on inner left rear frame rail) G402 (on top of Gnd Hot at all times J308 (w/o rv upfitter: in body harness, 5 cm from x304 breakout) (w/ rv upfitter: in body harness, 22 cm from x308 breakout) J310 J311 J412 (in rear hvac harness, 20 cm from auxiliary blower motor connector breakout) J413 (in rear hvac harness, 24 cm from auxiliary blower motor breakout) Left "d" pillar) Logic Low ref Provisional Serial + Serial - Serial data Tan Underhood fuse block (on left side of engine compt) Volt Volt + X319 Manual A/C Wiring Diagram, Passenger Van (3 of 3) for Chevrolet Chevy Express G2008 3500 List of elements for Manual A/C Wiring Diagram, Passenger Van (3 of 3) for Chevrolet Chevy Express G2008 3500: 41 (4.3l: at left front of engine) (4.8l, 5.3l & 6.0l: at lower right front of engine) (6.6l: top front of engine) a/c compressor clutch (in chassis harness, 15 cm from coolant heater breakout) j119 (in the engine chassis harness, 5 cm (1.96 in) from the maf sensor breakout) 12v ref 4.3l 4.8l, 5.3l & 6.0l 5v ref 1 5v ref 2 6.6l A/c cmprsr fuse 57 15a A/c cmprsr relay 74 A/c refrigerant pressure sensor A/c request sig Body control module (bcm) (behind lower right side of dash) Clutch ctrl Clutch rly ctrl Computer data lines system Electronic brake control module (ebcm) (on left frame rail, near center of vehicle) Engine control module (ecm) (left side of engine compt) Engine coolant temperature (ect) sensor (4.8l, 5.3l & 6.0l: at left front of engine) (4.3l: on left side of engine) (6.6l turbo: top of engine, near thermostat housing) Engine cooling fan (6.6l) (behind radiator) Fan cltch (d) fuse 58 10a Fan cltch (d) relay 75 (6.6l) G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine) G102 (left front lower side of the engine block) Gmlan (+) Gmlan (-) Gmlan data Hot at all times Hot w/ pwr/trn relay energized J102 J102 (4.3l: in engine harness, 6 cm from generator connector breakout) (4.8l, 5.3l & 6.0l: in engine harness, 8 cm from knock sensor breakout) (6.6l: in the engine chassis harness, 5 cm (1.96 in) from the maf sensor breakout) Low ref Press sens Sens sig Serial data Speed sig Tan Underhood fuse block (on left side of engine compt) W/ auxiliary fuel fired heater W/o auxiliary fuel fired heater Rear A/C Wiring Diagram, Provisions for Chevrolet Chevy Express G2008 3500 List of elements for Rear A/C Wiring Diagram, Provisions for Chevrolet Chevy Express G2008 3500: 15 (behind lower right side of dash) body control module (bcm) Body fuse block (under left front seat) Dimming ctrl G347 Harness, 5 cm from air temperature actuator connector breakout) j250 Hot at all times Hot in run Hvac 2 fuse 1 10a J356 (in body harness, 20 cm underhood fuse block breakout) Jx347 (in body harness, attached to lower left "b" pillar) Provisional Rear blwr fuse 37 30a X319 X407 X409
ANTI-LOCK BRAKES Anti-lock Brakes Wiring Diagram, with JL4 for Chevrolet Chevy Express G2008 3500 List of elements for Anti-lock Brakes Wiring Diagram, with JL4 for Chevrolet Chevy Express G2008 3500: 71 (behind left kick panel) g302 (in instrument panel harness, 5 cm from x200 breakout towards instrument panel cluster) j231 12v ref 4.3l 5.3l 5v ref 6.6l Abs ind Abs mdl fuse 60 40a Abs mtr fuse 61 50a Body control module (bcm) (behind lower right side of dash) Brake ind Brk sw fuse 32 10a Can bus hi Can bus hi data Can bus lo data Computer data lines system Dimming ctrl Electronic brake control module (ebcm) (on left frame rail, near center of vehicle) Engine control module (ecm) (left side of engine compt) G300 (on left frame rail, near ebcm) G302 (behind left kick panel) Gnd Hi spd gmlan data + Hi spd gmlan data- Hot at all times Hot in run Hot w/ run/crnk relay energized Ign volt Instrument panel cluster (ipc) Ip clstr fuse 30 10a J244 J250 (in dash harness, 5 cm from air temperature actuator connector breakout) J315 Left front wheel speed sensor (wss) (on inside of left front wheel) Left rear wheel speed sensor (wss) (at left rear wheel hub) Lf wheel spd sens Lo ref Lo spd gmlan Lof ref Logic Low stability ind Lr wheel speed sens Park brake switch (under left side of dash) Pnk Prk brk sw Red Rf wheel spd sens Right front wheel speed sensor (wss) (on inside of right front wheel) Right rear wheel speed sensor (wss) (at right rear wheel hub) Rr wheel speed sens Serial data Serial data enable Stability off ind Steering angle sens Steering phase a Steering phase c Steering sens a Steering sens b Steering sens c Steering sens sig Steering wheel speed/ position sensor (at base of steering column) Stop lamp switch (behind left side of dash, above brake pedal) Str/whl snsr (g) fuse 36 10a Tan Tcc brake sig Traction control switch Traction sw Underhood fuse block (on left side of engine compt) Vehicle spd sig Yaw & lateral acceleration sensor (under front passenger seat) Anti-lock Brakes Wiring Diagram, without JL4 for Chevrolet Chevy Express G2008 3500 List of elements for Anti-lock Brakes Wiring Diagram, without JL4 for Chevrolet Chevy Express G2008 3500: 41 (on left frame rail, near ebcm) g300 4.3l 5.3l 6.6l Abs ind Abs mdl fuse 60 40a Abs mtr fuse 61 50a Body control module (bcm) (behind lower right side of dash) Brake ind Brk sw fuse 32 10a Computer data lines system Electronic brake control module (ebcm) (on left frame rail, near center of vehicle) Engine control module (ecm) (left side of engine compt) G300 (on left frame rail, near ebcm) G302 (behind left kick panel) Gnd Hi spd gmlan bus + Hi spd gmlan bus - Hot at all times Hot w/ run/crnk relay energized Instrument panel cluster (ipc) Ip clstr fuse 30 10a J231 (in instrument panel harness, 5 cm from x200 breakout towards instrument panel cluster) J244 Left front wheel speed sensor (wss) (on inside of left front wheel) Lf wheel speed sens Lo spd gmlan Logic Low ref Park brake switch (under left side of dash) Pnk Prk brk sw Rf wheel spd sens Right front wheel speed sensor (wss) (on inside of right front wheel) Serial data Serial data enable Stop lamp switch (behind left side of dash, above brake pedal) Tan Tcc brake sig Underhood fuse block (on left side of engine compt) Vehicle spd sig
ANTI-THEFT Forced Entry Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Forced Entry Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500: 46 87a All drs lock pcb relay Battery b+ Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Cargo dr unlck fuse 25 15a Cargo unlck pcb relay Coax Computer data lines system Driv door lock rly Driv door lock sig Driv door unlock sig Drv dr unlck fuse 31 15a Drv unlk relay Frt dr lck fuse 27 15a Frt pass dr unlck fuse 30 15a G302 (behind left kick panel) G347 G348 Ground Hot at all times J247 J248 Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part of g348) Keyless entry antenna Left rear door jamb switch (w/ left rear hinged door side) (at left "b" pillar) Lf door ajar sw Lf door open sw Liftgate ajar sw sig Lr door open sw Pass door lock sw Pass/ cargo unlck relay Rear dr lck fuse 26 15a Rear open sw Rear pass dr unlck fuse 28 15a Remote control door lock receiver (rcdlr) (behind center of dash) Rf door ajar sw Rf door open sw Rfa/tpm fuse 11 10a Right rear door jamb switch (passenger/cargo) (at right "b" pillar) Rr door open sw Serial data Tan W/ commercial tradesman W/o commercial tradesman Forced Entry Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Forced Entry Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500: 32 (in body harness, 40 cm from x306 breakout) (in body harness, near front passenger seat, 20 cm from x306) Cargo door latch (cargo & passenger) (in right rear cargo door) Cargo door lock switch Cargo/ passenger Class 2 Computer data lines system Cutaway Driver door latch (at rear of driver door) Driver door lock switch Driver information center (dic) G347 G348 G401 (on top of right "d" pillar) Instrument panel cluster (ipc) J322 J323 J501 w/ electronic side door lock control J601 J901 Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part of g348) Left door contact plate (at left "b" pillar) Left rear door lock actuator (w/ left rear hinged side door) Logic Passenger door latch (at rear of front passenger door) Passenger door lock switch Right door contact plate (at right "b" pillar) Right rear door lock actuator (w/ rear hinged side door & rear sliding side door) Security indicator Tan W/ electronic side door lock control Pass-Key Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Pass-Key Wiring Diagram for Chevrolet Chevy Express G2008 3500: 25 Acc Body fuse block (under left front seat) Computer data lines system G302 (behind left kick panel) Gnd Hot at all times Hot w/ run/crank relay energized Ign Ign sw/ pk3 mdl fuse 3 2a Ign volt Ignition switch Instrument panel cluster (ipc) Ip clstr fuse 10a J202 J203 J205 Lo spd data Lock Logic Pnk Run Security ind Start Theft deterrent module (tdm) (in steering column, near ignition key cylinder housing) Underhood fuse block (on left side of engine compt)
BODY CONTROL MODULES Body Control Modules Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Body Control Modules Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500: 41 Accessory wakeup serial data Backlight dimm ctrl Batt pos volt Bcm 1 fuse 20 10a Bcm 2 fuse 37 15a Bcm 3 fuse 26 15a Bcm 4 fuse 22 10a Bcm 5 fuse 27 10a Bcm 6 fuse 23 10a Body control module (bcm) (behind lower right side of dash) Brake sw sig Computer data lines system Cruise control system Cruise ctrl dimm sig Dimm sw sig Dimm volt ref Exterior lights system G302 (behind left kick panel) Gnd Hdlp high beam rly ctrl Hdlp low beam ctrl Headlights system High speed serial data bus (+) High speed serial data bus (-) Hot at all times Instrument cluster system Interior lights system J248 L trailer turn sig lamp Local interconnect network 3 Low speed gmlan serial data Power distribution system R trailer turn sig lamp Rf turn sig lamp ctrl Run/crank rly coil ctrl Serial data communication enable Tan Underhood fuse block (on left side of engine compt) Windshield washer rly ctrl Wiper mtr park sw sig Wiper/washer system Body Control Modules Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Body Control Modules Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500: 80 (or 690) 12 volt ref A/c request signal A/t shift lock ctrl Acc Air conditioning system Alarm enable signal Ambient light sens sig Anti-lock brakes system Backup lamp rly ctrl Batt pos volt Bcm 7 fuse 25 10a Body control module (bcm) (behind lower right side of dash) Chmsl ctrl Courtesy lamp ctrl Courtesy lamps ctrl Cruise control & sound systems Cruise control system Cruise ctrl sw sig Defeat sw sig Dimm ctrl Door locks & anti-theft systems Drv door lock sw lock sig Drv door lock sw unlock sig Drv dr lock rly unlock ctrl Exterior lights system Flash to pass sw sig Front wind wiper sw hi sig Hdlp dimm low beam sig Hdlp low beam rly ctrl Hdlp off sig Hdlp on sig Headlights system Horn rly ctrl Horns system Hot at all times Ign volt Ignition switch Instrument cluster system Interior lights system J205 Key-in switch L turn haz sw sig Lf door ajar sw sig Lf door open sw sig Lf turn sig lamp ctrl Liftgate ajar sw sig Low ref Lr door open sw sig Lr turn sig lamp ctrl Off Park brake sw sig Park lamp ctrl Park lamps sig Pass door lock sw lock ctrl Pass dr lock sw unlock ctrl Pnk Power distribution system R turn haz sw sig Rear access open sw sig Rf door ajar sw sig Rf door open sw sig Rr door open sw sig Rr turn sig lamp ctrl Run Sound systems Start Steering wheel ctrl sig Stop lamps ctrl Tan Tcc brake sig Tow/haul switch signal Traction ctrl sw sig Transmissions system Underhood fuse block (on left side of engine compt) Washer switch signal Wiper high sw sig Wiper low sw sig Wiper sw sig 2 Wiper/washer system
COMPUTER DATA LINES Computer Data Lines Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Computer Data Lines Wiring Diagram for Chevrolet Chevy Express G2008 3500: 45 (behind left kick panel) g302 4.3l 4.8l, 5.3l & 6.0l 5.3l 6.6l Body control module (bcm) (behind lower right side of dash) Chime module (behind left center of dash) Coolant heater (6.6l) (attached to the left front inner frame rail) Data bus (+) Data bus (-) Data link connector (dlc) (under left side of dash) Data link resistor Electronic brake control module (ebcm) (on left frame rail, near center of vehicle) Electronic control module (ecm) (left side of engine compt) Except 5.3l Except 6.6l Except 6.6l w/ active brake control Except 6.6l w/o active brake control Fuel pump flow control module (5.3l) (at rear of vehicle, attached to left rear frame rail) Glow plug control module (gpcm) (6.6l) (left rear of engine) Hb01 Hb05 Hb06 Hb20 Hot at all times Inflatable restraint front passenger presence system (pps) sensor (on passenger's seat harness, near breakout for seat adjuster switch) Inflatable restraint sensing & diagnostic module (sdm) (under left front seat) Inflatable restraint vehicle roller sensor (w/ head curtain air bag) (front center floor board, between front seats) Instrument panel cluster (ipc) J244 Jx200 (in dash wiring harness, 10 cm from underhood pass- through grommet breakout) Jx250 (in dash harness, 20 cm (7.86 in) from underhood pass through grommet) Light duty w/o recreational vehicle, upfitter sales package Ltr/dlc fuse 38 20a Radio Remote control door lock receiver (rcdlr) (if equipped) (behind center of dash) Serial data Tan Theft deterrent module (tdm) (in steering column, near ignition key cylinder housing) Transmission control module (tcm) (6.6l: left front corner of engine compt) Underhood fuse block (on left side of engine compt) W/ auxiliary fuel fired heater W/ radio provisions W/o auxiliary fuel fired heater W/o radio provisions
CRUISE CONTROL Cruise Control Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Cruise Control Wiring Diagram for Chevrolet Chevy Express G2008 3500: 70 (behind left kick panel) g302 12v 4.3l 4.8l, 5.3l & 6.0l 5v ref 5v ref 2 6.6l Accelerator pedal position (app) sensor (under left side of dash) App sen 1 sig App sen 2 sig Automatic transmission output shaft speed (oss) sensor (at left rear of transmission) Batt + Bcm 2 fuse 37 10a Body control module (bcm) (behind lower right side of dash) Brake sw sig Brk sw fuse 32 10a Cancel Computer data lines system Cruise control ind dimming sig Cruise control switch signal Cruise ind Cruise switch Data bus + Data bus - Ecm batt (g) fuse 54 10a Engine control module (ecm) (left side of engine compt) Exterior lights system G103 (except 6.6l: on right rear of engine) (6.6l: left front lower side of the engine block) G302 (behind left kick panel) Gmlan Ground Hi spd gmlan ser data bus+ Hi spd gmlan ser data bus- Hot at all times Hot w/ run/crank relay energized Ign Inflatable restraint steering wheel module coil (at top of steering column) Instrument panel cluster (ipc) Interior lights system Ip clstr fuse 30 10a J101 J123 (in engine harness, 16 cm from underhood fuse block x1 breakout) J209 (in steering wheel harness, near x200 connector) J231 (5 cm from x200 breakout towards instrument panel cluster) J244 J248 Left steering wheel control switch Logic Low ref Pnk Res+ Ser data bus+ Ser data bus- Set- Sound systems Steering wheel cntrl sup volt Stop lamp sw sig Stop lamp switch (behind left side of dash, above brake pedal) Tac motor ctrl 1 Tac motor ctrl 2 Tan Throttle body (except 6.6l) Tp sens 1 sig Tp sens 2 sig Transmission control module (6.6l: left front corner of engine compt) Underhood fuse block (on left side of engine compt) Vss high sig Vss low sig W/ radio redundant steering wheel control W/o radio redundant steering wheel control
DEFOGGERS Defoggers Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Defoggers Wiring Diagram for Chevrolet Chevy Express G2008 3500: 39 (w/ electric rear window defogger & power windows) hvac control assembly A x1 A x2 Body fuse block (under left front seat) Defogger ind Driver outside rearview mirror (in driver door) G302 (behind left kick panel) G304 (behind right kick panel) G347 G348 G401 (on top of right "d" pillar) G402 (on top of left "d" pillar) Ground Hot at all times Hvac cntrl fuse 12 10a Ign J247 J401 J500 J600 J902 Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part Left rear window defog grid Logic Nca Of g348) Osr vm htr fuse 22 20a Passenger outside rear- view mirror (in right front passenger door) Rear defog fuse 21 30a Rear defog relay 44 (w/ electric rear window defogger & power windows) Rear window defogger switch Right rear window defog grid Rr defog rly pwr Stationary rear door window Swing out rear door window X1 a X2 a X3 d
ENGINE PERFORMANCE
4.3L VIN X 4.3L VIN X, Engine Performance Wiring Diagram (1 of 3) for Chevrolet Chevy Express G2008 3500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (1 of 3) for Chevrolet Chevy Express G2008 3500: 54 (cutaway: in chassis harness, 87 cm from ebcm connector breakout) (passenger/cargo: in chassis harness, 44 cm from ebcm connector breakout) (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 1 sensor 2 (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 2 sensor 2 (on inner left rear frame rail) g400 5v ref 2 A/c refrigerant pressure sensor Acc wak ser data Accelerator pedal position (app) sensor (under left side of dash) Air conditioning system Anti-lock brakes system App sens 2 sig App sensor 1 sig Batt pos volt Clutch rly ctrl Computer data lines system Ecm batt fuse 54 10a Ecm ign fuse 48 15a Engine control module (ecm) (left side of engine compt) Fuel lvl sens sig Fuel pump & sender assembly (on fuel tank) Fuel tank pressure (ftp) sensor (except 57 gal fuel tank: on fuel tank) (57 gal fuel tank: at fuel tank) Gmlan ser data+ Gmlan ser data- Ho2s hi sig Ho2s lo ctrl Ho2s lo sig Hot at all times Hot w/ run/ crnk relay 69 energized Ign Ign volt Instrument panel cluster (ipc) J301 Logic Low ref Maf sens sig Malfunction indicator lamp Mil ctrl Nca Pnk Pnk pnk Power distribution system Press sens sig Pressure ind low engine oil Pump rly ctrl Pwrtrn rly ctrl Rly ctrl Starting/charging system Tan Tan a Tan c Tos signal Transmissions system Underhood fuse block (on left side of engine compt) Vss signal 4.3L VIN X, Engine Performance Wiring Diagram (2 of 3) for Chevrolet Chevy Express G2008 3500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (2 of 3) for Chevrolet Chevy Express G2008 3500: 33 (on top of engine, near throttle body) evaporative emission (evap) canister purge solenoid 5v ref 1 Actuator sig Cnstr vent sol fuse 17 10a Ecm pwr/trn fuse 50 10a Engine control module (ecm) (left side of engine compt) Engine oil pressure (eop) sensor (on top rear of engine) Evap sol ctrl Evaporative emission (evap) canister vent solenoid valve (near front of fuel tank) Exterior lights system Fuel pump fuse 2 20a Fuel pump relay G102 (on left rear of engine) G103 (on right rear of engine) Hot at all times Iat sens sig Ign volt J101 J102 Maf/ cnstr vent fuse 49 15a Manifold absolute pressure (map) sensor (at top rear of engine, on intake manifold) Mass air flow (maf)/intake air temperature (iat) sensor (attached to air intake duct) O2 snsr 1 fuse 46 10a O2 snsr 2 fuse 56 10a Odd ign/inj fuse 55 20a Pnk Pnk pnk Pwr/trn relay 76 Tan Tcc brake sig Transmissions system Underhood fuse block (on left side of engine compt) V6 fuel inj fuse 59 15a 4.3L VIN X, Engine Performance Wiring Diagram (3 of 3) for Chevrolet Chevy Express G2008 3500 List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (3 of 3) for Chevrolet Chevy Express G2008 3500: 57 (at top of engine) central sequential fuel injection (central sfi) (inside intake manifold) fuel injectors 5v ref 1 5v ref 2 Camshaft position (cmp) sensor (part of distributor, top rear of engine) Ckp sens sig Cmp sens sig Crankshaft position (ckp) sensor (on lower front of engine, near crankshaft) Ect sens sig Engine control module (ecm) (left side of engine compt) Engine coolant temperature (ect) sensor (on left side of engine) Evap sol ctrl G103 (on right rear of engine) Gen field sig Gen on sig Gnd Gnd e Heated oxygen sensor (ho2s) bank 1 sensor 1 (in exhaust pipe, in front of catalytic converter) Heated oxygen sensor (ho2s) bank 2 sensor 1 (in exhaust pipe, in front of catalytic converter) Ho2s hi sig Ho2s lo ctrl Ho2s lo sig Ic 1 ctrl Ic 2 ctrl Ic 3 ctrl Ic1 ctrl b Ic3 ctrl c Ign volt f Ignition control module (icm) (on top right side of engine, ic2 ctrl at ignition coil) Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl J101 J102 J120 Knock sensor (ks) 1 (left side of engine block, near motor mount) Knock sensor (ks) 2 (right side of engine block, near motor mount) Ks 1 sig Ks 2 sig Low ref Low ref d Map sens sig Nca Pnk Pnk d Red Sens sig Starting/charging system Tac mtr 1 Tan Tan a Throttle position (tp) sensor (at throttle position (tp) sensor) Tp sens 1 Tp sens 2
5.3L VIN 4 5.3L VIN 4, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Chevy Express G2008 3500: 54 (cutaway: in chassis harness, 87 cm from ebcm connector breakout) (passenger/cargo: in chassis harness, 44 cm from ebcm connector breakout) (in engine harness, 16 cm from underhood fuse block x1 breakout) j123 (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 1 sensor 2 (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 2 sensor 2 (or pnk) 4.8l/6.0l 5.3l 5v ref 1 5v ref 2 A/c refrigerant pressure sensor Acc ser data Accelerator pedal position (app) sensor (under left side of dash) Actuator sig Anti-lock brakes system App sens 1 sig App sens 2 sig Batt pos volt Brk sw fuse 32 10a Computer data lines system Ecm batt fuse 54 10a Ecm ign fuse 48 15a Engine control module (ecm) (left side of engine compt) Fuel level sens Fuel pump & sender assembly (on fuel tank) Fuel tank pressure (ftp) sensor (except 57 gal fuel tank: on fuel tank) (57 gal fuel tank: at fuel tank) G103 (on right rear of engine) Gmlan data+ Gmlan data- Ho2s hi sig Ho2s lo sig Hot at all times Hot w/ run/ crnk relay 69 energized Iat sens sig Ign volt J101 J301 Low ref Maf sens sig Mass air flow (maf)/intake air temperature (iat) sensor (attached to air intake duct) Nca Pnk Power distribution system Press sens sig Pwrtrn rly ctrl Relay ctrl Start rly ctrl Starting/charging system Stop lamp switch (behind left side of dash, above brake pedal) Tan Tan c Tcc brake sig Transmissions system Underhood fuse block (on left side of engine compt) Vss 5.3L VIN 4, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Chevy Express G2008 3500: 47 (on left rear of engine) g102 (on right rear of engine) g103 (or pnk) 4.8l/6.0l 5.3l Clutch rly ctrl Cnstr vent sol fuse 17 10a Computer data lines system Ecm pwr/trn fuse 50 10a Engine control module (ecm) (left side of engine compt) Evap sol ctrl Evaporative emission (evap) canister vent solenoid (near front of fuel tank) Even ign/ inj fuse 52 20a Fuel pump relay 72 (4.8l/6.0l) Fuel/pump fuse 2 20a G400 (on inner left rear frame rail) Gnd Ho2s hi sig Ho2s lo ctrl Hot at all times Ic 1 ctrl Ic 2 ctrl Ic 3 ctrl Ic 4 ctrl Ic 5 ctrl Ic 6 ctrl Ic 7 ctrl Ic 8 ctrl Ign Instrument panel cluster (ipc) J101 J102 Logic Low engine oil pressure ind Low ref Maf/ cnstr vent fuse 49 15a Malfunction indicator lamp Mil ctrl O2 snsr 1 fuse 46 10a O2 snsr 2 fuse 56 10a Odd ign/inj fuse 55 20a Pnk Pwr/trn relay 76 Red Tos sig Transmissions system air conditioning system Underhood fuse block (on left side of engine compt) 5.3L VIN 4, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Chevy Express G2008 3500: 36 (at rear of vehicle, attached to left rear frame rail) (5.3l) fuel pump flow control module (at top left of engine) (in odd ignition/coil module jumper harness, on top left side of engine) 5v ref Bare Computer data lines system Fcsm ign fuse 11 10a Fscm batt fuse 15 20a G102 (on left rear of engine) G300 (on left frame rail, near ebcm) Gmlan data Gnd Hot at all times Hot w/ run/ crnk relay 69 energized Ign volt Ignition coil/module 1 Ignition coil/module 3 Ignition coil/module 5 Ignition coil/module 7 J182 J184 J315 Low ref Nca Pnk Pnk d Pnk pnk pnk pnk pnk pnk pnk pnk pnk Power distribution system Pump ctrl Red c Relay ctrl Sens sig Serial data Spark plug Tan Underhood fuse block (on left side of engine compt) 5.3L VIN 4, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Chevy Express G2008 3500: 29 (at top right of engine) (in even ignition/coil module jumper harness, on top right side of engine) j185 (on left side of intake manifold) (on right side of intake manifold) Engine oil pressure (eop) sensor (on top rear of engine) Fuel injector 1 Fuel injector 2 Fuel injector 3 Fuel injector 4 Fuel injector 5 Fuel injector 6 Fuel injector 7 Fuel injector 8 Fuel rail pressure (fpr) sensor G102 (on left rear of engine) Ignition coil/module 2 Ignition coil/module 4 Ignition coil/module 6 Ignition coil/module 8 J183 J188 Manifold absolute pressure (map) sensor (at top rear of engine, on intake manifold) Nca Pnk Pnk d Pnk pnk pnk pnk pnk pnk pnk pnk pnk Red c Spark plug Tan 5.3L VIN 4, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Chevy Express G2008 3500: 49 (6.0l) camshaft position (cmp) actuator solenoid valve (below front of intake manifold) knock sensor (ks) 1 (below rear of intake manifold) knock sensor (ks) 2 (on top of engine, near throttle body) evaporative emission (evap) canister purge solenoid 5v ref 1 5v ref 2 Camshaft position (cmp) sensor (front of engine, between water pump & crank pulley) Cen field sig Ckp sens sig Cmp sens sig Crankshaft position (ckp) sensor (on lower right rear of engine, near starter motor) Ect sens sig Engine control module (ecm) (left side of engine compt) Engine coolant temperature (ect) sensor (at left front of engine) G103 (on right rear of engine) Gen on sig Heated oxygen sensor (ho2s) bank 1 sensor 1 (in exhaust pipe, in front of catalytic converter) Heated oxygen sensor (ho2s) bank 2 sensor 1 (in exhaust pipe, in front of catalytic converter) Ho2s hi sig Ho2s lo ctrl Ho2s lo sig Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl Inj 7 ctrl Inj 8 ctrl Intake sol J101 Ks 1 sig Ks 2 sig Low ref Map sens sig Oil sw sig Pnk Pnk d Pre sens sig Sol ctrl Starting/ charging system Starting/charging system Tac mtr ctrl 1 Tac mtr ctrl 2 Tan Tan a Throttle body Tp sens 1 sig Tp sens 2 sig
EXTERIOR LIGHTS Backup Lamps Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Backup Lamps Wiring Diagram for Chevrolet Chevy Express G2008 3500: 29 (provisional) Aux/trlr bck/up fuse 10 10a Backup alarm (rear of vehicle on frame) Bck/up lamp pcb relay Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Computer data lines system Cutaway Electrical backup alarm G302 (behind left kick panel) G400 (on inner left rear frame rail) G401 (on top of right "d" pillar) G402 (on top of left "d" pillar) H x405 Hot at all times J247 J402 J403 J410 Left backup lamp (cargo/ passenger) Left tail/ stop & turn signal lamp Lo spd gmlan x3 Nca Relay ctrl x2 Right backup lamp (cargo/ passenger) Right tail/ stop & turn signal lamp T/lamp bck/up fuse 15 10a Trailer connector (if equipped) Underhood fuse block (on left side of engine compt) Exterior Lamps Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Exterior Lamps Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500: 59 (in dash harness, 13 cm from radio & hvac control assembly breakout) j245 (provisional) Alarm enable sig Aux prk lamp fuse 9 15a Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Brake sig Brake sw sig Breakout) j246 Cargo/ passenger Center high mounted stop lamp (chmsl) Chmsl ctrl Cutaway Driver outside rearview mirror (in driver door) Frt prk lamp fuse 14 10a G302 (behind left kick panel) G347 G348 G401 (on top of right "d" pillar) G402 (on top of left "d" pillar) Ground distribution system Hazard sw sig Hazard switch Hot at all times J202 J403 J403 (w/o rear window defogger) J410 J500 J600 J902 (w/ rear window defogger) Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part of g348) Left Left tail/stop & turn signal lamp Lf turn sig lp ctrl License lamp Lr turn sig lp ctrl Lt rear prk lamp fuse 34 10a Nca Park lamp ctrl Park lamps sig Passenger outside rearview mirror (in right front passenger door) Prk lamp relay Rf turn sig lp ctrl Right Right tail/stop & turn signal lamp Rr turn sig lp ctrl Rt rear prk lamp fuse 33 10a Stop lamps ctrl Tan Trailer tow circuit Trlr prk lamp fuse 13 15a Turn signal/ multi-function switch Upftr park lamps fuse 29 10a Volt ref W/ ambulance & recreational vehicle sales package W/ folding mirrors X320 Exterior Lamps Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Exterior Lamps Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500: 51 (in forward lamp harness, 48 cm from left headlamp breakout) j121 (in instrument panel harness, 5 cm from x200 breakout towards instrument panel cluster) j231 (provisional) 4.3l 6.6l Auto Aux stop lamp fuse 13 15a Brk sw fuse 32 10a Computer data lines system Cutaway E x405 Engine control module (ecm) (left side of engine compt) Except 4.3l & 6.6l G100 (on left front of engine compt) G101 (on right front of engine compt) G102 (except 6.6l: on left rear of engine) (6.6l: left front lower side of the engine block) G302 (behind left kick panel) G400 (on inner left rear frame rail) Head Headlamp & panel dimmer switch Hot at all times Hot w/ run/crank relay energized Ign Instrument panel cluster (ipc) Interior lights system Ip clstr fuse 30 10a J102 J110 J118 J123 (in engine harness, 16 cm from underhood fuse block x1 breakout) J248 J402 Left front marker lamp Left front park/ turn signal lamp Left turn ind Logic Off Park Pnk Right front marker lamp Right front park/ turn signal lamp Right turn ind Ser data Stop lamp switch (behind left side of dash, above brake pedal) Stop lamps pcb relay Transmission control module (tcm) (6.6l: left front corner of engine compt) Underhood fuse block (on left side of engine compt) X4 n X405 c X405 f X405 g Trailer Tow Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Trailer Tow Wiring Diagram for Chevrolet Chevy Express G2008 3500: 25 Backup lamps circuit Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Computer data lines system G302 (behind left kick panel) G400 (on inner left rear frame rail) Hi spd gmlan+ Hi spd gmlan- Hot at all times Hot w/ prk lamp relay 40 energized J247 J402 (except 5.3l w/ backup alarm) Lo spd gmlan Lt stp/ trn trlr fuse 16 10a Lt trailer turn signal lamp Rt stp/ trn trlr fuse 8 10a Rt trailer turn signal lamp Tan Trailer connector Trailer lh stop/turn pcb relay Trailer rh stop/turn pcb relay Trlr prk lamp fuse 13 15a Trlr wrg fuse 35 30a Trlr wrg fuse 62 30a Underhood fuse block (on left side of engine compt)
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for Ground Distribution Wiring Diagram (1 of 4) for Chevrolet Chevy Express G2008 3500: 78 (4.3l) ignition control module (icm) (4.3l) x1 (4.8l/5.3l/ 6.0l) (5.3l) fuel pump flow control module (6.6l) engine control module (ecm) (6.6l) engine cooling fan (6.6l) fan cltch relay (6.6l) vacuum pump (except 6.6l) mass air flow (maf)/ intake air temperature (iat) sensor (in forward lamp harness, 12 cm from left headlight connector breakout) (light duty) brake pressure differential switch (manual a/c) a/c compressor clutch (on left front of engine compt) g100 (w/ composite headlamps) left high beam headlamp (w/ composite headlamps) left low beam headlamp (w/ composite headlamps) right high beam headlamp (w/ composite headlamps) right low beam headlamp (w/ sealed beam headlamps) left headlamp (w/ sealed beam headlamps) right headlamp 4.8l/5.3l/6.0l Auxiliary battery Battery Blower motor resistor assembly Brake fluid level switch Camshaft position (cmp) sensor shield Crank relay Crankshaft position (ckp) sensor shield Electronic brake control module (ebcm) Engine control module (ecm) Engine oil level (eol) switch Fuel pressure regulator shield Fuel pump relay Fuel rail pressure (frp) sensor shield G101 (on right front of engine compt) G102 (except 6.6l: on left rear of engine) (6.6l: left front lower side of the engine block) G103 (except 6.6l: on right rear of engine) (6.6l: left front lower side of the engine block) G104 (on lower right front of engine) G105 (on right front frame rail, in engine compt) G106 (on right front of engine compt) G107 (6.6l) (left front lower side of the engine block) G108 (6.6l) (right front lower side of the engine block) G300 (on left frame rail, near ebcm) G305 (6.6l) (left center outer frame rail, near the secondary battery) Glow plug control module (gpcm) Horn assembly Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 J102 (4.3l: in engine harness, 6 cm from generator connector breakout) (4.8l/5.3l/6.0l: in engine harness, 8 cm from knock sensor breakout) (6.6l: in the engine chassis harness, approximately 5 cm (1.96 in) from the maf sensor breakout) J107 (in engine harness, between red J118 (in forward lamp harness, 13 cm from right headlight connector breakout) J182 (in odd ignition/coil module jumper harness, on top left side of engine) J183 (in even ignition/ coil module jumper harness, on top right side of engine) J315 (in chassis harness, 10 cm from g300 breakout) Left front marker lamp Left front park/turn signal lamp Nca Park/ neutral position (pnp) switch Red Right front marker lamp Right front park/turn signal lamp Run/ crank relay Sensor connector & cmp connector) Stop lamps pcb relay Transmission control module (tcm) Underhood fuse block (on left side of engine compt) Underhood lamp W/o active brake control w/ active brake control Windshield wiper motor Wiper diode Wiper hi diode Wiper pcb relay X110 & x111) Ground Distribution Wiring Diagram (2 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for Ground Distribution Wiring Diagram (2 of 4) for Chevrolet Chevy Express G2008 3500: 70 (6.6l) engine coolant level switch (if equipped) radio (in dash harness, 36 cm from x200 breakout) j247 (in dash harness, 5 cm from inflatable restraint i/p module connector breakout) (in instrument panel harness) (in steering column harness, approximately 25 cm from x200 connector) (rv upfitter & ambulance upfitter) upftr ctsy lamp pcb relay (rv upfitter) provisional (rv upfitter, cutway upfitter & ambulance upfitter) upftr aux2 relay 42 (w/ active brake control) traction control switch (tcs) (w/ brake warning indicator) brake booster fluid flow alarm switch (w/ rear window defogger & power mirrors) rear defog relay 44 (w/o radio) chime module Air temperature actuator All drs lock pcb relay Ambient light sensor Automatic transmission shift lock control solenoid Backup lamp pcb relay Body control module (bcm) Body fuse block (under left front seat) Body fuse block (under left x1 front seat) Center console 1 accessory power outlet Center console 2 accessory power outlet Cgo unlock pcb relay Data link connector (dlc) Driver information center (dic) switch Drv unlock pcb relay Electronic compass module G301 (behind left kick panel) G302 (behind left kick panel) G304 (behind right kick panel) Headlamp & panel dimmer switch Heavy duty Horn switch Hvac control assembly Inflatable restraint front passenger presence system (pps) sensor Inflatable restraint i/p module disable switch Inflatable restraint i/p module indicator Inflatable restraint sensing & diagnostic module (sdm) Inflatable restraint steering wheel module coil Inflatable restraint vehicle rollover sensor Instrument panel cluster (ipc) J210 (in steering wheel harness, near x200 connector) J244 (in instrument panel harness, approximately 5 cm from x200 breakout towards instrument cluster panel) J248 (in dash harness, 8 cm from x200 breakout) J264 (in steering column harness, 29 cm from x200) Left steering wheel control switch Light duty Pass/ cgo unlock pcb relay Rap relay 43 Redundant radio steering wheel controls Remote control door lock receiver (rcdlr) Right steering wheel control switch Run relay 39 Steering wheel speed/ position sensor Theft deterrent module Tow/ haul switch Turn signal/ multi-function switch W/ automatic electronic cruise control W/ automatic electronics cruise control & W/ compass display W/ electric side door lock control W/ rear window defogger & power mirrors W/ redundant radio steering wheel control W/ remote keyless entry & low tire pressure indicator W/o automatic electronics cruise control & W/o manual suppression switch & rv upfitter Windshield washer fluid pump Windshield wiper motor X222 Ground Distribution Wiring Diagram (3 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for Ground Distribution Wiring Diagram (3 of 4) for Chevrolet Chevy Express G2008 3500: 53 (if equipped) auxiliary blower motor switch (if equipped) driver seat adjuster switch (if equipped) passenger seat adjuster switch (passenger/ cargo) right rear door jamb switch (rv upfitter) provisional p (w/ auxiliary heater plumbing & heater) provisional b (w/ left rear hinged door) left rear door jamb switch Auxiliary hvac control module Cm from front courtesy & reading lamp connector breakout) Cutaway upfitter Dome lamp Driver door latch Driver door lock switch Driver outside rearview mirror Driver window switch From jx348 (diagram 3 of 4) Front auxiliary hvac control assembly Front dome/ reading lamps G347 (on bottom of left "b" pillar) G348 (right side of passenger compt, lower right of "b" pillar) If equipped J500 (in left front door harness, 6 cm from left front door speaker breakout) J501 (in left front door harness, approximately 7 cm from left front door speaker breakout) J600 (in right front door harness, 7 cm from right front door speaker breakout) J601 (in right front door harness, approximately 5 cm from passenger outside rearview mirror breakout) Jx347 Jx348 Left sunshade Left vanity mirror lamp Nca Outside rearview mirror switch Passenger door latch Passenger door lock switch Passenger outside rearview mirror Passenger window switch Provisional c Rear auxiliary hvac control assembly Right sunshade Right vanity mirror lamp Rv upfitter To front dome/ reading lamps (diagram 3 of 4) W/ electronic side door lock control W/ power mirrors & windows W/ rear a/c & front vanity mirror w/o rv upfitter W/ rear a/c & rv upfitter W/ rear a/c & rv upfitter, swb passenger W/ rear a/c w/o rv upfitter W/o electronic side door lock control W/o power mirrors & windows W/o rear a/c & front vanity mirror w/ rv upfitter X320 X321 X409 Ground Distribution Wiring Diagram (4 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for Ground Distribution Wiring Diagram (4 of 4) for Chevrolet Chevy Express G2008 3500: 71 (cargo w/o rv upfitter) dome lamp (if equipped) back-up alarm (w/ rear window defogger) left rear window defogger grid 5.3l w/o back-up alarm 6.6l Auxiliary air temperature actuator Auxiliary blower motor Auxiliary mode actuator Cargo door latch Cargo door lock switch Center high mounted stop lamp (chmsl) Coolant heater Dome lamp Except 5.3l Except 5.3l w/ back-up alarm Front cargo fluorescent work lamp Fuel heater Fuel pump Fuel pump & sender assembly Fuel pump coolant heater G400 (on inner left rear frame rail) G401 (on top of right "d" pillar) G402 (on top of left "d" pillar) G403 (w/ commercial tradesman sales package) (on center of left "d" pillar) J300 (in prp/uf2 harness, 42 cm from left front side front access panel actuator) J316 (in transmission harness, approximately 20 cm (7.87 in) from x174) J330 (in rear headliner harness, 30 cm from x420) J402 (cutaway: in chassis harness, 24 cm from g400 breakout) (passenger/cargo: in chassis harness, 16 cm from g400 breakout) J403 (in body harness, 6 cm from g401 breakout) J410 (in body harness, approximately 47 cm from x401 breakout) J411 (in rear hvac harness, 6 cm from auxiliary blower motor connector breakout) J901 (in rear cargo door harness, approximately 35 cm from x902) J902 (in right rear door harness, 19 cm from license lamp connector breakout) Left back-up lamp Left front access panel fluorescent work lamp Left front side front access panel actuator Left front side rear access panel actuator Left rear access panel fluorescent work lamp Left rear side front access panel actuator Left rear side rear access panel actuator Left tail/stop & turn signal lamp License lamp Middle dome/ reading lamps Nca Passenger Passenger/cargo & 4.3l/4.8l/6.0l Provisional g Rear auxiliary hvac control assembly Rear cargo fluorescent work lamp Rear dome/ reading lamps Right access panel fluorescent work lamp Right back-up lamp Right rear window defogger grid Right side front access panel actuator Right side rear access panel actuator Right tail/stop & turn signal lamp Trailer connector b W/ auxiliary a/c w/o rear a/c W/ auxiliary heater, rear a/c & rear window defogger W/ cargo lamps W/ electronic side door lock control W/ fuel fired auxiliary heater W/ rear a/c W/ rear a/c & swb W/ rear window defogger W/ truck trailer hd wiring harness W/o auxiliary heater & rear a/c W/o electronic side door lock control W/o rear window defogger W/o truck trailer hd wiring harness X405
HEADLIGHTS Headlights Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Headlights Wiring Diagram for Chevrolet Chevy Express G2008 3500: 58 Ambient light sensor (on top of instrument panel) Ambient sens sig Auto Body control module (bcm) (behind lower right side of dash) Computer data lines system Drl 1 fuse 12 15a Drl 2 fuse 10 10a Drl pcb relay Ftp Fusible link 2 G100 (on left front of engine compt) G101 (on right front of engine compt) G302 (behind left kick panel) Head Headlamp & panel dimmer switch Headlamp lo sig Headlamp sw sig Hi beam rly ctrl High beam ind High beam pcb relay Hot at all times Hot w/ run/crnk relay 69 energized Ign Instrument panel cluster (ipc) Ip clstr fuse 30 10a J110 J118 J202 J248 Left headlamp Left high beam headlamp Left low beam headlamp Lo beam ctrl Lo beam rly ctrl Logic Low Low beam pcb relay Lt high beam fuse 1 10a Lt lo beam fuse 7 10a Off Park Park brake switch (under left side of dash) Park brk sw sig Park lamps sig Pnk Red Right headlamp Right high beam headlamp Right low beam headlamp Rt high beam fuse 5 10a Rt lo beam fuse 9 10a Serial data Switch off sig Switch on sig Turn signal/ multi-function switch Underhood fuse block (on left side of engine compt) W/ chrome grille W/o chrome grille
HORN Horn Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Horn Wiring Diagram for Chevrolet Chevy Express G2008 3500: 19 (w/ automatic electronics cruise control & redundant radio steering wheel controls) j210 A x1 Body control module (behind lower right side of dash) G102 (except 6.6l: on left rear of engine) (6.6l: left front lower side of the engine block) G302 (behind left kick panel) Horn assembly (at left front of engine compt) Horn fuse 43 20a Horn pcb relay Horn relay ctrl Horn switch (in steering wheel) Hot at all times Inflatable restraint steering wheel module coil (at top of steering column) J102 J264 Tan Underhood fuse block (on left side of engine compt) X1 a X2 a X2 k
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Instrument Cluster Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500: 61 (if equipped) electronic compass module Abs ind Air bag ind Ambient air temperature sensor (w/ outside temperature display) (behind front grille, on radiator support) Batt pos volt Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Brake ind Charge ind Cmps fuse 2 10a Computer data lines system Coolant temperature gauge Cruise ind Dic sw sig Driver information center (dic) Engine controls system Engine coolant level switch (diesel) (right front of engine compt, attached to bottom of coolant surge tank) Fuel gauge G302 (behind left kick panel) Gmlan serial Gnd High beam ind Hot at all times Hot w/ run relay 39 energized Hot w/ run/crank relay energized Ign volt Ind ctrl Ind lamp (mil) malfunction Instrument panel cluster (ipc) Ip clstr fuse 30 10a Ip clstr fuse 7 10a J244 Left turn ind Logic Low engine oil pressure gauge Low ref Low tire pressure ind Mil ctrl Network 3 Odometer Park brake switch (under left side of dash) Pass off ind Pass on ind Pnk Pressure ind low engine oil Pss seat belt Right turn ind Seat belt ind Security ind Sens sig Seo fuse 21 10a Speedometer Sw sig Switch sig Tow/haul ind Traction control ind Underhood fuse block (on left side of engine compt) Volts gauge W/ odometer security wiring provision (seo) W/o odometer security wiring provision (seo) Wait to start ind (diesel) Instrument Cluster Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Instrument Cluster Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500: 49 (or ic57) (or ic66) (or ic68) (or ic71) 4.3l 4.8l/5.3l/6.0l 5.3l 5v ref 2 6.6l Brake booster fluid flow alarm switch (in power steering pump outlet hose) Brake booster fluid pressure alarm switch (in power steering pump inlet hose) Brake fluid level switch (at left rear of engine compt) Brake pressure differential switch (on brake valve, near front of ebcm) Computer data lines system Data link resistor Driver information center (dic) switch Engine control module (ecm) (left side of engine compt) Engine controls system Engine oil level (eol) switch (on left side of oil pan) Engine oil level (eol) switch (on right side of oil pan) Engine oil pressure (eop) sensor (except 6.6l: on top rear of engine) (6.6l: lower left side of engine) Except 5.3l Fuel level sensor (on fuel tank) Fuel pump & sender assembly (on fuel tank) G103 (except 6.6l: on right rear of engine) (6.6l: left front lower side of the engine block) G103 (on right rear of engine) G107 (left front lower side of the engine block) G300 (on left frame rail, near ebcm) G302 (behind left kick panel) Heavy duty Illumi- nation Ind ctrl Interior lights system J101 J244 J301 (cutaway: in chassis harness, 87 cm from ebcm connector breakout) (passenger/cargo: in chassis harness, 44 cm from ebcm connector breakout) J315 Light duty Low ref Person- alization Pnk Sens sig Set/ reset Switch sig Tan Trip/ fuel Vehicle info W/ brake warning indicator system Water in fuel sensor
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Courtesy Lamps Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500: 64 (cargo/passenger) (in body harness, 15 cm from x306 breakout) j331 (or 690) (provisional) (w/ left rear hinged door) (w/ rear a/c, left & right sunshade mirror w/o rv upfitter) j314 All times Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Cargo door latch assembly (in right rear cargo door) Cargo/passenger Courtesy lp ctrl Ctsy lp ctrl Defeat sw sig Dome Fl dome rly ctrl Front dome/ reading lamps G102 (except 6.6l: on left rear of engine) (6.6l: left front lower side of the engine block) G302 (behind left kick panel) G348 G401 (on top of right "d" pillar) G401 (passenger) (on top of right "d" pillar) G402 (cargo) (on top of left "d" pillar) Harness, 11 cm from right sunshade breakout) j332 Headlamp & panel dimmer switch Hot at J102 J247 J248 J302 J330 J407 (in rear headliner harness, 44 cm from x420) J901 w/ electronic side door lock control Jx348 (in body harness, attached to lower right "b" pillar part of g348) Left sunshade (on upper left of headliner) Lf dr ajar sw sig Liftgate ajar sw sig Lr dr open sw sig Middle dome/ reading lamps Passenger Passenger/cargo w/o rv upfitter Reading Rear dome/ reading lamps (passenger) dome lamp (cargo) Red Rf dr ajar sw sig Right sunshade (on upper right of headliner) Rr dr open sw sig Underhood fuse block (on left side of engine compt) Underhood lamp Upfitter & rv upfitter Upftr aux 1 fuse 36 (w/ cutaway, ambulance & rv upfitters) 50a Upftr ctsy lamps fuse 4 15a Upftr ctsy lamps pcb relay W/ ambulance W/ commercial tradesman sales package & cargo lamp W/ cutaway W/ cutaway & cargo w/o rv upfitter W/ left & right sunshade mirror W/ rv upfitter W/ rv upfitter, left & right sunshade mirror W/o ambulance upfitter & rv upfitter W/o rv upfitter X320 r X405 k Courtesy Lamps Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Courtesy Lamps Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500: 23 (at left "b" pillar) (w/ commercial tradesman sales package & cargo lamp) dome fluorescent work lamps relay (w/ electronic side door lock control) j501 Dome fluorescent work lamps fuse 2 10a Driver door latch assembly (at rear of driver door) Front cargo fluorescent work lamp G347 G348 G403 (on center of left "d" pillar) J312 J348 J350 (in prp/uf2 harness, 12 cm from left front dome fluorescent work lamp connector) J601 (w/ electronic side door lock control) Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part of g348) Left front access panel fluorescent work lamp Left rear access panel fluorescent work lamp Left rear door ajar switch (w/ left rear hinged door) (at base of left "b" pillar) Passenger door latch assembly (at rear of front passenger door) Rear cargo fluorescent work lamp Rear fuse block (on left "b" pillar) Red Right access panel fluorescent work lamp Right rear door ajar switch (cargo/ passenger) (at right "b" pillar) Instrument Illumination Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Instrument Illumination Wiring Diagram for Chevrolet Chevy Express G2008 3500: 68 (at top of steering column) inflatable restraint steering wheel module coil (in instrument panel harness, 70 cm from radio & hvac control assembly) j207 (in steering wheel harness, near x200 connector) j208 (not used) (w/ power mirrors & power windows) j600 Auto Auxiliary blower motor switch Battery pos volt Bcm 3 fuse 26 15a Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Dimming ctrl Dimming volt ref Driver door lock switch Driver information center (dic) switch Driver window switch Exterior lights system Front auxiliary hvac control assembly G301 (behind left kick panel) G302 (behind left kick panel) G304 (behind right kick panel) G347 G348 Headlamp & panel dimmer switch Headlamps off sig Heavy duty Hot at all times Hvac control assembly Inflatable restraint i/p module disable switch (w/ manual suppression) J210 J244 J248 J249 J250 (in dash harness, 5 cm from air temperature actuator connector breakout) J265 J314 J355 (w/ rear auxiliary controls & rv upfitter: in upfitter hvac control harness, 11 cm from auxiliary hvac control processor connector breakout) (w/o rv upfitter: in front headliner harness, 21 cm from x304 breakout) J356 (in body harness, 20 cm from underhood fuse block breakout) Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part of g348) Left steering wheel control switch Lps dimmer sw sig Lps dimming ctrl Off Park head Park lamps sig Passenger door lock switch Passenger window switch Pnk Radio Rear auxiliary hvac control assembly Right steering wheel control switch Str whl snsr fuse 17 2a Tow/haul switch Traction control switch (tcs) (w/ active brake control) Underhood fuse block (on left side of engine compt) W/ automatic cruise control & redundant radio steering wheel control W/ automatic electronic cruise control W/ auxiliary heater & w/o rear a/c W/ electric side door lock W/ power operated window W/ rear auxiliary controls W/ redundant radio steering wheel control W/ rv upfitter W/o radio provisions W/o rear auxiliary controls W/o redundant radio steering wheel control W/o rv upfitter
POWER DISTRIBUTION
4.3L VIN X 4.3L VIN X, Power Distribution Wiring Diagram (1 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (1 of 4) for Chevrolet Chevy Express G2008 3500: 59 (on left side of engine compt) underhood fuse block Abs mdl fuse 60 40a Abs mtr fuse 61 50a Aux pwr outlet fuse 33 20a Battery Bcm 1 fuse 20 10a Bcm 2 fuse 37 15a Bcm 3 fuse 26 10a Bcm 4 fuse 22 10a Bcm 5 fuse 27 10a Bcm 6 fuse 23 10a Bcm 7 fuse 25 10a Blower motor resistor assembly Body control module (bcm) Body fuse block (under left front seat) Center console 1 accessory power outlet Center console 2 accessory power outlet Cigar lighter Cnstr vent sol fuse 17 10a Data link connector (dlc) Ecm batt fuse 54 10a Electronic brake control module (ebcm) Engine control module (ecm) Evaporative emission (evap) canister vent solenoid valve Fcsm batt fuse 15 20a From cmps fuse 2 (diagram 4 of 4) From run relay 39 (diagram 4 of 4) Frt blwr fuse 66 40a Fuel pump flow control module (5.3l) Fusible link 2 Fusible link 3 G302 (behind left kick panel) G304 (behind right kick panel) Generator Instrument panel cluster (ipc) (w/ odometer security wiring provision (seo)) J247 J249 Ltr/dlc fuse 38 20a Red Seo fuse 21 10a Starter motor Tcm batt fuse 44 10a To high beam pcb relay (diagram 2 of 4) Trailer connector Transmission control module (tcm) Trlr wrg fuse 35 30a Trlr wrg fuse 62 30a Upfitter provisional Upftr aux 2 fuse 35 50a Upftr aux 2 relay 42 (cutaway, ambulance & rv upfitters) W/ active brake control W/ cigar lighter W/ cutaway upfitter W/ rv upfitter W/ truck trailer W/o active brake control W/o cigar lighter X222 X321 4.3L VIN X, Power Distribution Wiring Diagram (2 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (2 of 4) for Chevrolet Chevy Express G2008 3500: 45 (in engine harness, 5 cm from x101 breakout) j120 (in even ignition/ coil module jumper harness, on top right side of engine) j185 (in odd ignition/coil module jumper harness, on top left side of engine) j184 (on left side of engine compt) underhood fuse block 4.3l A/c cmprsr relay 74 (manual a/c) Central sequential fuel injection (central sfi) (4.3l) Crnk relay 73 Drl pcb relay Ecm pwr/trn fuse 50 10a Engine control module (ecm) Evaporative emission (evap) canister purge solenoid valve Even ign inj fuse 52 (except 4.3l) 20a Except 4.3l From trlr wrg fuse a (diagram 1 of 4) Fuel injector Fuel pump relay 72 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 Hi wpr relay 70 High beam pcb relay Horn pcb relay Ignition coil Ignition control module (icm) Lo beam pcb relay Maf/cnstr vent fuse 49 15a Mass air flow (maf)/ intake air temperature (iat) sensor Mega fuse 77 125a Nca O2 snsr 1 fuse 46 10a O2 snsr 2 fuse 56 10a Odd ign inj fuse 55 20a Pnk Pwr/trn relay 76 Stop lamps pcb relay (cutaway) To body fuse block (diagram 4 of 4) To run/crnk relay 69 (diagram 3 of 4) Trailer lh stop/turn pcb relay (w/ truck trailer) Trailer rh stop/turn pcb relay (w/ truck trailer) V6 fuel inj fuse 59 15a Washer pcb relay Wpr fuse 39 25a Wpr relay 7 4.3L VIN X, Power Distribution Wiring Diagram (3 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (3 of 4) for Chevrolet Chevy Express G2008 3500: 61 (in chassis harness, 7 cm from ecbm breakout) (in prp/uf2 harness, 7 cm from breakout for rear fuse block) j312 (in steering column harness, 30 cm from x200 connector) j205 4.3l 4.8l & 6.0l 5.3l Acc Air bag fuse 34 10a Automatic transmission Body control module (bcm) Brk sw fuse 32 10a Dome fluorescent work lamps fuse 2 10a Ecm ign fuse 48 15a Electronic brake control module (ebcm) Engine control module (ecm) Engine control module (edm) Except 4.3l Fluorescent work lamp relay From body fuse block (diagram 4 of 4) From mega fuse 77 (diagram 2 of 4) Fscm ign fuse 11 10a Fuel pump flow control module Fuel pump flow control module (5.3l) G102 (on left rear of engine) Ignition switch Inflatable restraint i/p module disable switch Inflatable restraint i/p module indicator Inflatable restraint sensing & diagnostic module (sdm) Instrument panel cluster (ipc) Ip clstr fuse 30 10a J102 J115 (in engine harness, 15 cm from x101 breakout) J203 (in steering column harness, 27 cm from x200 connector) J302 (in prp/uf2 harness, 15 cm from rear fuse block) J303 (in prp/uf2 harness, 8 cm from rear fuse block) Key-in switch Left front access panel relay 5 Left rear access panel relay 1 Off Panel actuator fuse 3 45a Pnk Rear fuse block (on left "b" pillar) Red Right access panel relay 6 Run Run/crnk relay 69 Start Steering wheel speed/ position sensor Stop lamp switch Str/whl snsr fuse 36 (w/ active control brake) 10a Tcm ign fuse 47 15a Theft deterrent module (tdm) Trans fuse 51 15a Transmission control module (tcm) Underhood fuse block (on left side of engine compt) W/ active brake control W/ cargo W/ manual suppression W/ power brake W/o rv upfitter & manual suppression X175 4.3L VIN X, Power Distribution Wiring Diagram (4 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for 4.3L VIN X, Power Distribution Wiring Diagram (4 of 4) for Chevrolet Chevy Express G2008 3500: 78 (except rear auxiliary & rv upfitter: in front headliner harness, 15 cm from x205 breakout towards left vanity mirror lamp connector) (w/ rear auxiliary & rv upfitter: in upfitter hvac control harness, 88 cm from x303 breakout) (except rv upfitter: in front headliner harness, 52 cm from x304 breakout) (in rear hvac harness, 13 cm from auxiliary blower motor connector breakout) j405 (not used) (under left front seat) body fuse block Air bag aos fuse 32 10a Air temperature actuator All drs lock pcb relay Auxiliary air temperature actuator Auxiliary blower motor high speed relay Auxiliary blower motor low speed relay Auxiliary blower motor medium speed relay Auxiliary hvac control module Auxiliary mode actuator Bck/up lamp pcb relay Body control module (bcm) Cgo unlck pcb relay Chime module Cmps fuse fuse 2 10a Driver seat adjuster switch (w/ driver power seat adjuster) Driver window switch (if equipped) Drv unlck pcb relay Electronic compass module (if equipped) Empty fuse From underhood fuse block (diagram 2 of 4) Front auxiliary hvac control assembly G302 (behind left kick panel) Hvac 1 fuse 5 20a Hvac 2 fuse 1 10a Hvac cntrl fuse 12 10a Hvac control assembly Hvac control assembly (w/ electric rear window defogger & power windows) Hvac control assembly (w/ rear window defogger, power mirrors & manual a/c) I/p clstr fuse 7 10a Ign sw pk3 mdl fuse 3 2a Inflatable restraint front passenger system (pps) presence sensor (light duty w/o rv upfiitter) Inflatable restraint sensing & diagnostic module (sdm) Inflatable restraint vehicle rollover sensor (w/ left & right roof side) Instrument panel cluster (ipc) (w/o odometer security wiring provision (seo)) J247 J307 J412 (in rear hvac harness, 20 cm from auxiliary blower motor connector breakout) Osrvm sw fuse 18 2a Outside rearview mirror switch (if equipped) Pass/cgo unlck pcb relay Passenger seat adjuster switch (w/ passenger power seat adjuster) Passenger window switch (if equipped) Prk lamp relay 40 Pwr seats circuit breaker 46 30a Pwr wdo circuit breaker 45 25a Radio Rap relay Rdo/chime fuse 8 15a Rear auxiliary hvac control assembly Rear blwr fuse 37 30a Rear defog relay 44 (w/ power mirror & rear window defogger) Remote control door lock receiver (rcdlr) (w/ low tire pressure & remote keyless entry) Rfa/trm fuse 11 10a Run relay 39 To j203 (diagram 3 of 4) To rear fuse block (diagram 3 of 4) To upftr aux 2 relay 42 (diagram 1 of 4) Upfitter provisional Upftr aux 1 fuse 36 (w/ cutaway, ambulance & rv upfitters) 50a Upftr ctsy lamps pcb relay (w/ ambulance & rv upfitters) W/ commercial tradesman W/ cutaway W/ electric side door lock control W/ manual a/c, power mirrors & rear window defogger W/ radio W/ rear a/c W/ rear a/c & auxiliary heater W/ rear a/c, auxiliary heater, plumbing & wiring provision W/ rv upfitter W/ rv upfitter & 3406 W/o radio W/o rv upfitter X222 X321
5.3L VIN 4 5.3L VIN 4, Power Distribution Wiring Diagram (1 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Power Distribution Wiring Diagram (1 of 4) for Chevrolet Chevy Express G2008 3500: 59 (on left side of engine compt) underhood fuse block Abs mdl fuse 60 40a Abs mtr fuse 61 50a Aux pwr outlet fuse 33 20a Battery Bcm 1 fuse 20 10a Bcm 2 fuse 37 15a Bcm 3 fuse 26 10a Bcm 4 fuse 22 10a Bcm 5 fuse 27 10a Bcm 6 fuse 23 10a Bcm 7 fuse 25 10a Blower motor resistor assembly Body control module (bcm) Body fuse block (under left front seat) Center console 1 accessory power outlet Center console 2 accessory power outlet Cigar lighter Cnstr vent sol fuse 17 10a Data link connector (dlc) Ecm batt fuse 54 10a Electronic brake control module (ebcm) Engine control module (ecm) Evaporative emission (evap) canister vent solenoid valve Fcsm batt fuse 15 20a From cmps fuse 2 (diagram 4 of 4) From run relay 39 (diagram 4 of 4) Frt blwr fuse 66 40a Fuel pump flow control module (5.3l) Fusible link 2 Fusible link 3 G302 (behind left kick panel) G304 (behind right kick panel) Generator Instrument panel cluster (ipc) (w/ odometer security wiring provision (seo)) J247 J249 Ltr/dlc fuse 38 20a Red Seo fuse 21 10a Starter motor Tcm batt fuse 44 10a To high beam pcb relay (diagram 2 of 4) Trailer connector Transmission control module (tcm) Trlr wrg fuse 35 30a Trlr wrg fuse 62 30a Upfitter provisional Upftr aux 2 fuse 35 50a Upftr aux 2 relay 42 (cutaway, ambulance & rv upfitters) W/ active brake control W/ cigar lighter W/ cutaway upfitter W/ rv upfitter W/ truck trailer W/o active brake control W/o cigar lighter X222 X321 5.3L VIN 4, Power Distribution Wiring Diagram (2 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Power Distribution Wiring Diagram (2 of 4) for Chevrolet Chevy Express G2008 3500: 45 (in engine harness, 5 cm from x101 breakout) j120 (in even ignition/ coil module jumper harness, on top right side of engine) j185 (in odd ignition/coil module jumper harness, on top left side of engine) j184 (on left side of engine compt) underhood fuse block 4.3l A/c cmprsr relay 74 (manual a/c) Central sequential fuel injection (central sfi) (4.3l) Crnk relay 73 Drl pcb relay Ecm pwr/trn fuse 50 10a Engine control module (ecm) Evaporative emission (evap) canister purge solenoid valve Even ign inj fuse 52 (except 4.3l) 20a Except 4.3l From trlr wrg fuse a (diagram 1 of 4) Fuel injector Fuel pump relay 72 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 Hi wpr relay 70 High beam pcb relay Horn pcb relay Ignition coil Ignition control module (icm) Lo beam pcb relay Maf/cnstr vent fuse 49 15a Mass air flow (maf)/ intake air temperature (iat) sensor Mega fuse 77 125a Nca O2 snsr 1 fuse 46 10a O2 snsr 2 fuse 56 10a Odd ign inj fuse 55 20a Pnk Pwr/trn relay 76 Stop lamps pcb relay (cutaway) To body fuse block (diagram 4 of 4) To run/crnk relay 69 (diagram 3 of 4) Trailer lh stop/turn pcb relay (w/ truck trailer) Trailer rh stop/turn pcb relay (w/ truck trailer) V6 fuel inj fuse 59 15a Washer pcb relay Wpr fuse 39 25a Wpr relay 7 5.3L VIN 4, Power Distribution Wiring Diagram (3 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Power Distribution Wiring Diagram (3 of 4) for Chevrolet Chevy Express G2008 3500: 61 (in chassis harness, 7 cm from ecbm breakout) (in prp/uf2 harness, 7 cm from breakout for rear fuse block) j312 (in steering column harness, 30 cm from x200 connector) j205 4.3l 4.8l & 6.0l 5.3l Acc Air bag fuse 34 10a Automatic transmission Body control module (bcm) Brk sw fuse 32 10a Dome fluorescent work lamps fuse 2 10a Ecm ign fuse 48 15a Electronic brake control module (ebcm) Engine control module (ecm) Engine control module (edm) Except 4.3l Fluorescent work lamp relay From body fuse block (diagram 4 of 4) From mega fuse 77 (diagram 2 of 4) Fscm ign fuse 11 10a Fuel pump flow control module Fuel pump flow control module (5.3l) G102 (on left rear of engine) Ignition switch Inflatable restraint i/p module disable switch Inflatable restraint i/p module indicator Inflatable restraint sensing & diagnostic module (sdm) Instrument panel cluster (ipc) Ip clstr fuse 30 10a J102 J115 (in engine harness, 15 cm from x101 breakout) J203 (in steering column harness, 27 cm from x200 connector) J302 (in prp/uf2 harness, 15 cm from rear fuse block) J303 (in prp/uf2 harness, 8 cm from rear fuse block) Key-in switch Left front access panel relay 5 Left rear access panel relay 1 Off Panel actuator fuse 3 45a Pnk Rear fuse block (on left "b" pillar) Red Right access panel relay 6 Run Run/crnk relay 69 Start Steering wheel speed/ position sensor Stop lamp switch Str/whl snsr fuse 36 (w/ active control brake) 10a Tcm ign fuse 47 15a Theft deterrent module (tdm) Trans fuse 51 15a Transmission control module (tcm) Underhood fuse block (on left side of engine compt) W/ active brake control W/ cargo W/ manual suppression W/ power brake W/o rv upfitter & manual suppression X175 5.3L VIN 4, Power Distribution Wiring Diagram (4 of 4) for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Power Distribution Wiring Diagram (4 of 4) for Chevrolet Chevy Express G2008 3500: 78 (except rear auxiliary & rv upfitter: in front headliner harness, 15 cm from x205 breakout towards left vanity mirror lamp connector) (w/ rear auxiliary & rv upfitter: in upfitter hvac control harness, 88 cm from x303 breakout) (except rv upfitter: in front headliner harness, 52 cm from x304 breakout) (in rear hvac harness, 13 cm from auxiliary blower motor connector breakout) j405 (not used) (under left front seat) body fuse block Air bag aos fuse 32 10a Air temperature actuator All drs lock pcb relay Auxiliary air temperature actuator Auxiliary blower motor high speed relay Auxiliary blower motor low speed relay Auxiliary blower motor medium speed relay Auxiliary hvac control module Auxiliary mode actuator Bck/up lamp pcb relay Body control module (bcm) Cgo unlck pcb relay Chime module Cmps fuse fuse 2 10a Driver seat adjuster switch (w/ driver power seat adjuster) Driver window switch (if equipped) Drv unlck pcb relay Electronic compass module (if equipped) Empty fuse From underhood fuse block (diagram 2 of 4) Front auxiliary hvac control assembly G302 (behind left kick panel) Hvac 1 fuse 5 20a Hvac 2 fuse 1 10a Hvac cntrl fuse 12 10a Hvac control assembly Hvac control assembly (w/ electric rear window defogger & power windows) Hvac control assembly (w/ rear window defogger, power mirrors & manual a/c) I/p clstr fuse 7 10a Ign sw pk3 mdl fuse 3 2a Inflatable restraint front passenger system (pps) presence sensor (light duty w/o rv upfiitter) Inflatable restraint sensing & diagnostic module (sdm) Inflatable restraint vehicle rollover sensor (w/ left & right roof side) Instrument panel cluster (ipc) (w/o odometer security wiring provision (seo)) J247 J307 J412 (in rear hvac harness, 20 cm from auxiliary blower motor connector breakout) Osrvm sw fuse 18 2a Outside rearview mirror switch (if equipped) Pass/cgo unlck pcb relay Passenger seat adjuster switch (w/ passenger power seat adjuster) Passenger window switch (if equipped) Prk lamp relay 40 Pwr seats circuit breaker 46 30a Pwr wdo circuit breaker 45 25a Radio Rap relay Rdo/chime fuse 8 15a Rear auxiliary hvac control assembly Rear blwr fuse 37 30a Rear defog relay 44 (w/ power mirror & rear window defogger) Remote control door lock receiver (rcdlr) (w/ low tire pressure & remote keyless entry) Rfa/trm fuse 11 10a Run relay 39 To j203 (diagram 3 of 4) To rear fuse block (diagram 3 of 4) To upftr aux 2 relay 42 (diagram 1 of 4) Upfitter provisional Upftr aux 1 fuse 36 (w/ cutaway, ambulance & rv upfitters) 50a Upftr ctsy lamps pcb relay (w/ ambulance & rv upfitters) W/ commercial tradesman W/ cutaway W/ electric side door lock control W/ manual a/c, power mirrors & rear window defogger W/ radio W/ rear a/c W/ rear a/c & auxiliary heater W/ rear a/c, auxiliary heater, plumbing & wiring provision W/ rv upfitter W/ rv upfitter & 3406 W/o radio W/o rv upfitter X222 X321
POWER DOOR LOCKS Power Door Locks Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Power Door Locks Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500: 46 87a All drs lock pcb relay Battery b+ Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Cargo dr unlck fuse 25 15a Cargo unlck pcb relay Coax Computer data lines system Driv door lock rly Driv door lock sig Driv door unlock sig Drv dr unlck fuse 31 15a Drv unlk relay Frt dr lck fuse 27 15a Frt pass dr unlck fuse 30 15a G302 (behind left kick panel) G347 G348 Ground Hot at all times J247 J248 Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part of g348) Keyless entry antenna Left rear door jamb switch (w/ left rear hinged door side) (at left "b" pillar) Lf door ajar sw Lf door open sw Liftgate ajar sw sig Lr door open sw Pass door lock sw Pass/ cargo unlck relay Rear dr lck fuse 26 15a Rear open sw Rear pass dr unlck fuse 28 15a Remote control door lock receiver (rcdlr) (behind center of dash) Rf door ajar sw Rf door open sw Rfa/tpm fuse 11 10a Right rear door jamb switch (passenger/cargo) (at right "b" pillar) Rr door open sw Serial data Tan W/ commercial tradesman W/o commercial tradesman Power Door Locks Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Power Door Locks Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500: 32 (in body harness, 40 cm from x306 breakout) (in body harness, near front passenger seat, 20 cm from x306) Cargo door latch (cargo & passenger) (in right rear cargo door) Cargo door lock switch Cargo/ passenger Class 2 Computer data lines system Cutaway Driver door latch (at rear of driver door) Driver door lock switch Driver information center (dic) G347 G348 G401 (on top of right "d" pillar) Instrument panel cluster (ipc) J322 J323 J501 w/ electronic side door lock control J601 J901 Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part of g348) Left door contact plate (at left "b" pillar) Left rear door lock actuator (w/ left rear hinged side door) Logic Passenger door latch (at rear of front passenger door) Passenger door lock switch Right door contact plate (at right "b" pillar) Right rear door lock actuator (w/ rear hinged side door & rear sliding side door) Security indicator Tan W/ electronic side door lock control
POWER MIRRORS Power Mirrors Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Power Mirrors Wiring Diagram for Chevrolet Chevy Express G2008 3500: 17 Body fuse block (under left front seat) Connector) Defogger system Driver Driver outside rearview mirror (in driver door) Exterior lights system G347 Hot at all times J500 Jx347 (in body harness, attached to lower left "b" pillar) Nca Osrvm sw fuse 18 2a Outside rearview mirror switch Passenger Passenger outside rearview mirror (in right front passenger door) R/l Up/dn
POWER SEATS Power Seats Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Power Seats Wiring Diagram for Chevrolet Chevy Express G2008 3500: 26 All- down All-up Back Body fuse block (under left front seat) Down Driver seat adjuster motor assembly Driver seat adjuster switch Entire seat For- ward Front down Front up Front vertical G347 G348 Horizontal Hot at all times Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part of g348) Nca Passenger seat adjuster motor assembly Passenger seat adjuster switch Pwr seats circuit breaker 46 30a Rear down Rear up Rear vertical Tan
POWER WINDOWS Power Windows Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Power Windows Wiring Diagram for Chevrolet Chevy Express G2008 3500: 22 Body control module (behind lower right side of dash) Body fuse block (under left front seat) Driver window motor (in driver door) Driver window switch G302 (behind left kick panel) G347 G348 Hot at all times Interior lights system J247 J500 J600 Jx347 (in body harness, attached to lower left "b" pillar) Jx348 (in body harness, attached to lower right "b" pillar part of g348) Left Passenger window motor (in front passenger door) Passenger window switch Pwr wdo circuit breaker 45 25a Rap relay Right Rly ctrl Tan
RADIO Radio Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Radio Wiring Diagram for Chevrolet Chevy Express G2008 3500: 53 (at top of steering column) inflatable restraint steering wheel module coil (behind left kick panel) g302 (in body harness, 10 cm from x415 breakout) j451 (in body harness, 10 cm from x419 breakout) j450 (not used) 12v ref Antenna in Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Coax Computer data lines system Cruise control system Cutaway, upfitter Gnd Hot at all times Info Interior lights system J248 J452 (in body harness, 46 cm from x417 breakout) J453 (in body harness, 52 cm from x417 breakout) Led dimming ctrl Left cargo door speaker (if equipped) Left front speaker Left rear speaker Lf mid out (+) Lf mid out (-) Lo gmlan serial data Lo serial data Lr mid out (+) Lr mid out (-) Mute Passenger/ cargo Pnk Radio Radio antenna Rdo/ chime fuse 8 15a Rf mid out (+) Rf mid out (-) Right cargo door speaker (if equipped) Right front speaker Right rear speaker Right steering wheel control switch Rr mid out (+) Rr mid out (-) Seek down Seek up Source Steering wheel ctrl Tan Vol down Vol up W/ ambulance/ rv upfitters X320
SHIFT INTERLOCK Shift Interlock Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Shift Interlock Wiring Diagram for Chevrolet Chevy Express G2008 3500: 21 (+) (-) (in instrument panel harness, 5 cm from x200 breakout toward instrument panel cluster) j231 6.6l 4.8l, 5.3l & 6.0l 4.3l Automatic transmission shift lock control solenoid (on right side of steering column, under support bracket) Body control module (bcm) (behind lower right side of dash) Brk sig Brk sw fuse 32 10a Computer data lines system Engine control module G302 (behind left kick panel) Gm lan hi spd Hot w/ run/crank relay energized J264 Park/neutral position switch Pnk Sol ctrl Stop lamp switch (behind left side of dash, above brake pedal) Tan Transmission control module Underhood fuse block (on left side of engine compt)
STARTING/CHARGING
4.3L VIN X 4.3L VIN X, Charging Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for 4.3L VIN X, Charging Wiring Diagram for Chevrolet Chevy Express G2008 3500: 30 (on right front of engine compt) g106 4.3l Battery Charge ind Computer data lines system Data bus (+) x1 Data bus (-) Driver information center (dic) Engine control module (ecm) (left side of engine compt) Except 4.3l Fusible link 3 G104 (on lower right front of engine) G105 (on right front frame rail, in engine compt) Generator Generator field duty cycle sig Generator turn on sig x2 Gmlan serial data Hot w/ run/crank relay energized Ign volt Instrument panel cluster (ipc) Ip clstr fuse 30 10a Logic Pnk Power distribution system Red Starting circuit Tan Underhood fuse block (on left side of engine compt) X1 b X2 b 4.3L VIN X, Starting Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for 4.3L VIN X, Starting Wiring Diagram for Chevrolet Chevy Express G2008 3500: 35 (on lower right front of engine) 4.3l Battery Body control module (bcm) (behind lower right side of dash) Charging circuit Computer data lines system Crnk relay 73 Data bus (+) Data bus (-) Engine control module (ecm) (left side of engine compt) Except 4.3l Fusible link 2 G102 (on left rear of engine) G103 (on right rear of engine) G104 G105 (on right front frame rail, in engine compt) G106 (on right front of engine compt) Gmlan serial data Ignition lock cylinder Ignition switch Ignition voltage J101 J102 Off P/n Park/neutral position (pnp) switch (on left side of transmission) Pnk Red Run acc Start Starter enable relay ctrl Starter motor Strtr sol fuse 64 40a Tan Underhood fuse block (on left side of engine compt)
5.3L VIN 4 5.3L VIN 4, Charging Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Charging Wiring Diagram for Chevrolet Chevy Express G2008 3500: 30 (on right front of engine compt) g106 4.3l Battery Charge ind Computer data lines system Data bus (+) x1 Data bus (-) Driver information center (dic) Engine control module (ecm) (left side of engine compt) Except 4.3l Fusible link 3 G104 (on lower right front of engine) G105 (on right front frame rail, in engine compt) Generator Generator field duty cycle sig Generator turn on sig x2 Gmlan serial data Hot w/ run/crank relay energized Ign volt Instrument panel cluster (ipc) Ip clstr fuse 30 10a Logic Pnk Power distribution system Red Starting circuit Tan Underhood fuse block (on left side of engine compt) X1 b X2 b 5.3L VIN 4, Starting Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for 5.3L VIN 4, Starting Wiring Diagram for Chevrolet Chevy Express G2008 3500: 35 (on lower right front of engine) 4.3l Battery Body control module (bcm) (behind lower right side of dash) Charging circuit Computer data lines system Crnk relay 73 Data bus (+) Data bus (-) Engine control module (ecm) (left side of engine compt) Except 4.3l Fusible link 2 G102 (on left rear of engine) G103 (on right rear of engine) G104 G105 (on right front frame rail, in engine compt) G106 (on right front of engine compt) Gmlan serial data Ignition lock cylinder Ignition switch Ignition voltage J101 J102 Off P/n Park/neutral position (pnp) switch (on left side of transmission) Pnk Red Run acc Start Starter enable relay ctrl Starter motor Strtr sol fuse 64 40a Tan Underhood fuse block (on left side of engine compt)
SUPPLEMENTAL RESTRAINTS Supplemental Restraints Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Supplemental Restraints Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500: 73 (behind left kick panel) g301 (on passenger's seat harness, near breakout for seat adjuster switch) (w/o manual suppression switch & rv/upfitter) inflatable restraint front passenger presence system (pps) sensor (w/ manual suppression switch) inflatable restraint i/p module disable switch Air bag fuse 34 10a Air bag off ind Air bag on ind Air bag/ aos fuse 32 10a Batt Body fuse block (under left front seat) Computer data lines system Driver seat belt switch driver seat belt buckle Frt prk lamp fuse 14 10a G301 (behind left kick panel) Ground Heavy duty Hi ctrl Hot at all times Hot w/ prk lamp relay 40 energized Hot w/ run/ crnk relay 69 energized Hot w/ run/ crnk relay energized Ign Inflatable restraint sensing & diagnostic module (sdm) (under left front seat) Inflatable restraint steering wheel module (in steering wheel) Inflatable restraint steering wheel module (light duty) (in steering wheel) Inflatable restraint steering wheel module coil (at top of steering column) Interior lights system Ip clstr fuse 30 10a J265 J313 (in body harness, 11 cm from pnk J320 (28 cm from seat belt buckle driver x2 connector breakout) J321 (in passenger seat harness, below passenger seat) L hi ctrl L lo ctrl L seat belt sw L seat position sens Left inflatable restraint seat position sensor (sps) (light duty) (in left seat) Lf sensing mod sig Light duty Lo ctrl Lo spd gmlan seria Logic Low reference Low spd Lr sensing mod sig Nca Passenger seat belt buckle (w/o manual suppression switch & rv/upfitter) Passenger seat belt switch Pin shorting bars engaged when module connector is disconnected from harness (shorting bars are connected between pins: 4-5, 6-7, 8-9, 10-11, 12-13, 14-15, 22-23, 24-25 & 26-27) Pnk Pnk a R hi ctrl R lo ctrl R seat belt sw R seat position sens Red Rf sensing mod sig Right inflatable restraint seat position sensor (sps) (light duty) (in right front seat) Rollover hi sig Rr hi ctrl Rr lo ctrl Rr sensing mod sig Sens sig Shorting bar Shorting bar bar Stage 1 Stage 2 Suppression ind ctrl Sw sig Tan Underhood fuse block (on left side of engine compt) W/ manual suppression switch W/o manual suppression switch & rv/upfitter X307) Supplemental Restraints Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Supplemental Restraints Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500: 45 (behind left kick panel) g301 (w/ head curtain air bag) (front center floor board, between front seats) (w/o manual suppression switch & rv/upfitter) inflatable restraint i/p module indicator Air bag ind Batt Computer Computer data lines system Data lines G302 (behind left kick panel) Gnd Heavy duty Hi sig Ign Inflatable restraint front end sensor (on lower center of radiator support) Inflatable restraint i/p module (behind right side of dash) Inflatable restraint i/p module (light duty) (behind right side of dash) Inflatable restraint vehicle rollover sensor Instrument panel cluster (ipc) J244 J248 J265 Left front inflatable restraint roof rail module (left side of headliner) Left front inflatable restraint side impact sensor (sis) (in left front side door) Left front seat belt pretensioner (light duty) Left rear inflatable restraint side impact sensor (sis) (left center of vehicle behind body panel trim) Light duty Lo spd Logic Nca Off ind On ind Passenger Pnk Right front inflatable restraint roof rail module Right front inflatable restraint side impact sensor (sis) (in right front side door) Right front seat belt pretensioner (light duty) (on right side of right front seat) Right rear inflatable restraint roof rail module Right rear inflatable restraint side impact sensor (sis) (in lower right side of vehicle, near rear side door) Seat belt ind Shorting bar Stage 1 Stage 2 System W/ rear hinged door W/ rear sliding door
TRANSMISSION Transmission Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Transmission Wiring Diagram (1 of 2) for Chevrolet Chevy Express G2008 3500: 47 1-2 shift sol 2-3 shift sol 3-2 shift sol A/t output shaft speed (oss) sensor assembly (at left rear of transmission) Acc wakeup data Batt pos volt Brk sw fuse 32 10a Brk sw sign Computer data lines system G103 (on right rear of engine) Gnd Hi spd gmlan data (+) Hi spd gmlan data (-) Hot at all times Hot w/ run/crank relay 69 energized Hot w/ run/crank relay energized Ign volt Iss sig J101 J123 (in engine harness, 16 cm from underhood fuse block x1 breakout) Low ref P/n Park/neutral position (pnp) switch (on left side of transmission) Pc sol hi Pc sol low Pnk Power distribution system Replicated tos sig Stop lamp switch (behind left side of dash, above brake pedal) Tan Tcc pwm Tcc sol valve ctrl Tcm batt fuse 44 10a Tcm ign fuse 47 15a Tfp sw a sig Tfp sw b sig Tfp sw c sig Tft sens sig Tr sw a sig Tr sw b sig Tr sw c sig Tr sw p sig Trans fuse 51 15a Transmission control module (tcm) Underhood fuse block (on left side of engine compt) Vss hi sig Vss low sig Transmission Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500 List of elements for Transmission Wiring Diagram (2 of 2) for Chevrolet Chevy Express G2008 3500: 36 1-2 shift solenoid (ss) valve 2-3 shift solenoid (ss) valve 3-2 shift solenoid (ss) valve 4.3l 5.3l Automatic transmission Automatic transmission fluid temperature (tft) sensor Automatic transmission pressure manual valve position switch Body control module (bcm) (behind lower right side of dash) Computer data lines system Engine control module (ecm) (left side of engine compt) G302 (behind left kick panel) Hi spd gmlan + Hi spd gmlan - Ind mil Input speed sensor (iss) Instrument panel cluster (ipc) J135 J248 Lo gm gmlan Logic Mil ctrl Mil sig Nca Pnk Pressure control (pc) solenoid valve Prnd321 Red Replicated tos sign Rev Tan Torque converter clutch (tcc) pulse width modulation (pwm) solenoid valve Torque converter clutch (tcc) solenoid valve Tow/ haul ind Tow/haul sw sig Tow/haul switch
TRUNK, TAILGATE, FUEL DOOR Access Panel Release Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Access Panel Release Wiring Diagram for Chevrolet Chevy Express G2008 3500: 24 Access panel left side front relay control Access panel left side rear relay control Access panel right side rear relay control Body control module (behind lower right side of dash) G403 (on center of left "d" pillar) Hot at all times J300 J303 J309 (in prp/uf2 harness, between left side front access panel actuators) J408 (in prp/uf2 harness, between left side rear access panel actuators) J409 (in prp/uf2 harness, 88 cm from right dome fluorescent work lamp connector breakout) Left front access panel relay 5 Left front side front access panel actuator (behind left front access panel) Left front side rear access panel actuator (behind left front access panel) Left rear access panel relay 1 Left rear side front access panel actuator (behind left rear access panel) Left rear side rear access panel actuator (behind left rear access panel) Panel actuator fuse 3 15a Pnk Rear fuse block (on left "b" pillar) Right access panel relay 6 Right side front access panel actuator (behind right front access panel) Right side rear access panel actuator (behind right rear access panel) Tan
WARNING SYSTEMS Warning Systems Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Warning Systems Wiring Diagram for Chevrolet Chevy Express G2008 3500: 76 (behind left kick panel) g302 (in passenger seat harness, below passenger seat) j321 Air bag fuse 34 10a Alarm enable sig Auto Battery Body control module (bcm) (behind lower right side of dash) Body fuse block (under left front seat) Brake booster fluid flow alarm switch (w/ brake warning indicator) (in power steering pump outlet hose) Brake booster fluid pressure alarm switch (w/ brake warning indicator) (in power steering pump inlet hose) Brake warn ind ctrl Chime module (w/ radio provisions) (behind left center of dash) Connector (dlc) (under left side of dash) Data link Driver door latch assembly (at rear of driver door) Driver seat belt buckle Driver seat belt switch G302 (behind left kick panel) G347 Ground Hazard sw left sig Hazard sw right sig Hazard switch Head Headlamp & panel dimmer switch Headlamp sw off sig Hot at all times Hot w/ run/crank relay 69 energized Ign sw/ pk3 mdl fuse 3 2a Ign volt Ignition key switch Ignition switch Inflatable restraint i/p module indicator (w/o manual suppression switch & rv upfitter) Inflatable restraint sensing & diagnostic module (sdm) (under left front seat) Instrument panel cluster (ipc) J202 J203 J244 J248 J313 (in body harness, 11 cm form x307) J320 (in body harness, 28 cm from seat belt buckle driver x2 connector breakout) J501 (w/ electric side door lock control) Jx200 (in dash wiring harness, 10 cm from underhood pass-through grommet breakout) Jx347 (attached to lower left "b" pillar) Left seat belt sw Left turn Lf dr ajar sw sig Logic Low ref Low speed serial data Off Park Park brake switch (under left side of dash) Park brk sw sig Park lamp signal Passenger air bag ind Passenger seat belt buckle (w/o manual suppression switch & rv upfitter) Passenger seat belt ind Passenger seat belt switch Pnk Radio Rdo/chime fuse 8 15a Red Right seat belt sw Right turn Seat belt ind Serial data Switch & rv upfitter Tan Tire pressure ind Turn signal/ multi-function switch Underhood fuse block (on left side of engine compt) W/ manual suppression switch W/ radio provisions W/o manual suppression W/o radio provisions
WIPER/WASHER Wiper/Washer Wiring Diagram for Chevrolet Chevy Express G2008 3500 List of elements for Wiper/Washer Wiring Diagram for Chevrolet Chevy Express G2008 3500: 31 (except 6.6l: on left rear of engine) (6.6l: left front lower side of the engine block) Body control module (bcm) (behind lower right side of dash) Front windshield wiper switch hi signal G102 G302 (behind left kick panel) Hot at all times Int J102 J247 J248 Low reference Mist Off Pnk Tan Turn signal/ multi-function switch Underhood fuse block (on left side of engine compt) Washer pcb relay Windshield washer fluid pump (on left front of engine compt, at washer reservoir) Windshield washer relay control Windshield washer switch signal Windshield wiper motor (on left side of firewall) Windshield wiper motor park switch signal Windshield wiper switch hi signal Windshield wiper switch low signal Windshield wiper switch signal 2 Wpr fuse 39 25a Wpr pcb relay 71 Wpr-hi pcb relay 70 Wsw fuse 41 15a X3 k
