Diagram sections — 28 (65 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 NAVIGATION POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER TOP/SUNROOF POWER WINDOWS RADIO SHIFT INTERLOCK STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING Compressor Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Compressor Wiring Diagram for Hummer H3 Alpha 2008: 29 (in hvac harness, approximately 13.5 cm (5.3 in) before breakout to evaporator temperature sensor) j250 5v ref A/c clutch diode 90 A/c clutch relay A/c compressor clutch (part of a/c compressor) A/c on ind A/c on switch A/c refrigerant pressure sensor (on high pressure hose connection to compressor) A/c req sig A41 A42 A43 Ac clutch fuse 48 10a Body control module (bcm) (behind right front kick panel) Computer data lines system Engine control module (ecm) (right rear corner of engine compt) Evap temp sig Evaporator temperature sensor (behind right lower dash) G103 (on lower left side of engine block, forward of g102) Hot at all times Hot w/ run/ crank relay 78 energized Hvac control module (beneath radio) Logic Low ref Manual a/c circuit Press sens sig Rly ctrl Serial data Underhood fuse block (above left front wheelwell) Manual A/C Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008 List of elements for Manual A/C Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008: 58 (behind right front kick panel) body control module (bcm) (in i/p harness, approximately 2.5 cm (1 in) to right of data link connector in main bundle) j214 5v ref A/c on ind A/c on switch A/c recir req sig A/c req sig A26 A41 A42 A43 Air temp a Blower motor (below right side of dash) Blower motor resistor assembly (attached to bottom of blower) Blower motor switch Computer data lines system Defog ind cctrl Defog sw sig Defogger system Dimmer sw sig Evap temp sig G106 (on right inner front wheelwell) G300 (under driver seat carpet, on floor board) Grd High High speed blower motor relay (attached to blower motor case) Hot at all times Hvac blwr fuse 82 30a Hvac cntrl hd fuse 59 10a Hvac control module (beneath radio) Hvac relay Ign 3 volt Ign rly ctrl Interior lights system J205 J206 J251 L air temp b L air temp sig Logic Low Low ref Mode door b Mode door sig Mode switch Off Pnk R air temp b R air temp sig Rdo fuse 13 10a Recir- culation ind Recir- culation switch Recirc a Recirc b Serial data Tan Temperature switch Underhood fuse block (above left front wheelwell) Manual A/C Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008 List of elements for Manual A/C Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008: 33 (in hvac harness, approximately 10 cm (3.9 in) back from right air temperature actuator connector) (in hvac harness, approximately 28.5 cm (11.2 in) back from right air temperature actuator connector) j240 13.5 cm (5.3 in) before breakout to evaporator temperature sensor) j250 3.7l 5.3l 5v ref A/c clutch diode 90 A/c clutch relay 76 A/c compressor clutch (part of a/c compressor) A/c refrigerant pressure sensor (on high pressure hose connection to compressor) Ac clutch fuse 48 10a Computer data lines system Ect sens sig Engine control module (ecm) (right rear corner of engine compt) Engine coolant temperature (ect) sensor (front left of engine) Evaporator temperature sensor (behind right lower dash) G103 (on lower left side of engine block, forward of g102) Hot at all times Hot w/ run/ crank relay 78 energized J230 J232 Left air temperature actuator (mounted to left side of hvac module assembly) Logic Low ref Mode actuator (on side of heater box) Nca Press sens sig Recirculation actuator (upper right corner of heater case) Right air temperature actuator (mounted to right side of hvac module assembly) Rly ctrl Serial data Tan Underhood fuse block (above left front wheelwell)
ANTI-LOCK BRAKES Anti-lock Brakes Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008 List of elements for Anti-lock Brakes Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008: 48 5v ref Abs/vses fuse 29 10a Abs/vses1 -mtr Abs/vses2 -sol fuse 64 30a Batt + Bkup volt Brake fluid level switch (on left side of brake fluid reservoir) Brake pressure modulator valve (bpmv) Brk fld sig Can h Can l Dlvrd torq sig Electronic brake control module (ebcm) (left of master cylinder) Exterior lights system Fuse 67 40a G105 (on left inner front wheelwell, behind battery) Gnd Grd Hot at all times Hot w/ run/crnk relay energized Ign 1 volt Ign 3 volt J110 Left front wheel speed sensor (wss) (attached to left front wheel hub) Left rear wheel speed sensor (wss) (attached to left side of rear axle) Lf spd low ref Lf spd sig Low ref Lr spd low ref Lr spd sig Pnk Red Req torq sig Rf spd low ref Rf spd sig Right front wheel speed sensor (wss) (attached to right front wheel hub) Right rear wheel speed sensor (wss) (attached to right side of rear axle) Rr spd low ref Rr spd sig Serial class 2 Steering pos sig Steering sig a Steering sig b Stop fuse 54 15a Stop lamp switch (above brake pedal assembly) Stop lp volt Tan Underhood fuse block (above left front wheelwell) Anti-lock Brakes Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008 List of elements for Anti-lock Brakes Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008: 44 A17 A31 A37 A38 A39 A41 Abs ind Accessory switch Body control module (bcm) (behind right front kick panel) Brake ind Can h Can l Class 2 (ebcm) Class 2 serial data Data link connector (dlc) (left side of dash) Delivered torque signal Driver info center Engine control module (ecm) (right rear corner of engine compt) G106 (on right inner front wheel well) G300 (under driver seat carpet, on floor board) Gnd Hot w/ hvac relay energized Ign Ign 3 volt Instrument panel cluster (ipc) Interior lights system J141 J205 J300 Logic Park brake switch (left lower side of dash) Park brk sw sig Pulse sig steering Requested torque signal Sig a steering Stability caution ind Steering sig b Steering wheel position sensor (w/ active brake control) (near base of steering column) Stop lp volt Trac ctrl sw sig Traction control switch Underhood fuse block (above left front wheelwell) Vses/abs fuse 52 10a Yaw & lateral accelerometer sensor (w/ active brake control) (under driver seat near x307)
ANTI-THEFT Forced Entry Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Forced Entry Wiring Diagram for Hummer H3 Alpha 2008: 42 A19 A24 A25 A32 A38 A39 A40 A44 A47 Bcm fuse 14 10a Body control module (bcm) (behind right front kick panel) Class 2 serial data Clstr fuse 19 10a Driver door jamb switch (in lower left "b" pillar) Engine control module (right rear corner of engine compt) Exterior lights system Frt trn/hazrd/ ctsy mir fuse 56 15a G300 (under driver seat carpet, on floor board) G320 (under rear of middle console carpet, on floor board) Gnd Headlamp rly ctrl Headlights system Horn rly ctrl Horns system Hot at all times Instrument panel cluster J300 J320 J347 (in body harness, approximately 42 cm (16.5 in) rearward of breakout to right seat belt pretensioner) Left rear door jamb switch (in lower left "c" pillar) Lf door jamb sig Liftgate ajar switch (in right "d" pillar) Lr dr jamb sig sw Parklamp rly ctrl Passenger door jamb switch (in lower right "b" pillar) Rear trn/ hazrd fuse 20 20a Rf dr jamb sig sw Right rear door jamb switch (in lower right "c" pillar) Rr dr jamb sw sig Security ind ctrl Security indicator Underhood fuse block (above left front wheelwell) Immobilizer Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Immobilizer Wiring Diagram for Hummer H3 Alpha 2008: 26 A19 A39 Acc Batt ign switch fuse 5 10a Batter Body control module (bcm) (behind right front kick panel) Clstr fuse 19 10a Computer data lines system G300 (under driver seat carpet, on floor board) Ground Hot at all times Ign vol Ign volt Ignition switch Instrument panel cluster (ipc) J200 J201 J251 Lock Run Security ind Ser data Serial data Start Theft deterrent module (tdm) Underhood fuse block (above left front wheelwell)
BODY CONTROL MODULES Body Control Modules Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008 List of elements for Body Control Modules Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008: 95 (under rear of middle console carpet, on floor board) g320 A/c req sig A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30 A31 A32 A33 A34 A35 A36 A37 A38 A39 A40 A41 A42 A43 A44 A45 A46 A47 A48 Accessory voltage Air conditioning system Anti-lock brakes system Battery + Bcm fuse 14 10a Body control module (bcm) (behind right front kick panel) Class 2 serial data Computer data lines system Courtesy lamp low ctrl Defogger system Door locks system Door unlock ctrl Drl rly ctrl Engine controls system Exterior lights system Fog lamp rly ctrl Frt trn/hazrd/ ctsy mir fuse 56 15a Ground Headlamp rly ctrl Headlights system Hi beam rly ctrl Horn rly ctrl Horns system Hot at all times Ign rly ctrl Inadvertent pwr ctrl Interior lights system J320 Left trn sig lamp ctrl Lf door ajar sw sig Lr door ajar sw sig Lr park lamps ctrl Lr stop/turn lamp ctrl Mirrors system Park brake sw sig Park lamp rly ctrl Pass dr lock sw lock ctrl Power distribution system Rap rly coil ctrl Rear defog rly ctrl Rear trn/ hazrd fuse 20 20a Red Rf door ajar sw sig Right trn sig lamp ctrl Rr door ajar sw sig Rr stop/turn lamp ctrl Run/crnk voltage Starting/charging system Stop lamp volt Underhood fuse block (above left front wheelwell) Windshield washer pmp ctrl Wiper mtr prk sw sig Wiper sw sig 2 Wiper/washer system Body Control Modules Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008 List of elements for Body Control Modules Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008: 95 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30 A31 A32 A33 A34 A35 A36 A37 A38 A39 A40 A41 A42 A43 A44 A45 A46 A47 A48 Acc Accessory voltage Ambient light sens low ref Ambient light sens sig Anti-lock brakes system Anti-theft system Body control module (bcm) (behind right front kick panel) Cellular phones system Class 2 serial data Computer data lines system Courtesy lamp ctrl Courtesy lamp low ctrl Defogger system Dome override sw sig Exterior lights system Flash to pass sw sig Front fog lamp sw sig Front fog lamps ind ctrl Hazard sw sig Headlamp sw headlamps on sig Headlamps dim sw hi beam sig Headlamps sw off sig Headlights system Horn rly ctrl Horns system Hot at all times I/p lamp dimmer sw sig I/p lamps dim ctrl Ign key resistor sig Ignition switch Inadvertent pwr ctrl Int lamp sw sig Interior lights system J201 Key-in ignition switch Low ref Off Off/run/crnk voltage Onstar voice sig Park lamp sw sig Rear defog ind ctrl Rear defog sw sig Red Rr turn signal lamp ctrl Run Run/crnk voltage Security ind lamp Shift interlock system Shift sol ctrl Start Tan Traction ctrl sw sig Turn sig sw sig Windshield washer pmp ctrl Wiper sw sig 1 Wiper/washer system
COMPUTER DATA LINES Computer Data Lines Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Computer Data Lines Wiring Diagram for Hummer H3 Alpha 2008: 38 (under driver seat carpet, on floor board) g300 A/t A38 A39 A41 A42 A44 A47 Aux pwr 1 fuse 51 20a Body control module (bcm) (behind right front kick panel) Cigar lighter Class 2 serial data Data link connector (dlc) (left side of dash) Data link resistor Digital radio receiver (right side of dash) Electronic brake control module (ebcm) (left of master cylinder) Engine control module (ecm) (right rear corner of engine compt) G106 (on right inner front wheelwell) Generator battery control module (left front of engine compt, near battery) Hi spd lan serial data + Hi spd lan serial data - Hi spd serial data bus + Hi spd serial data bus - Hot at all times Inflatable restraint sensing & diagnostic module (sdm) (beneath lower console) Instrument panel cluster (ipc) J202 J203 J205 J251 M/t Radio Tan Theft deterrent module (tdm) Transfer case shift control module (behind glove box) Transmission control module (tcm) Underhood fuse block (above left front wheelwell) Vehicle communication interface module (vcim) (center of dash below hvac control head)
CRUISE CONTROL Cruise Control Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Cruise Control Wiring Diagram for Hummer H3 Alpha 2008: 50 5 volt reference 2 5-volt reference 1 5-volt reference 2 A/t Accelerator pedal position (app) sensor (on accelerator pedal bracket) App sensor 1 signal App sensor 2 signal Class 2 serial data Clstr fuse 19 10a Computer data lines system Cruise control on/off switch Cruise control release signal Cruise control release switch (top of brake pedal assembly) Cruise control switch Cruise indicator Cruise/misc fuse 35 10a Engine control module (ecm) (right rear of engine compartment) G300 (under driver seat carpet, on floor board) Gmlan hi (+) Gmlan hi (-) Gnd Hot at all times Hot w/ run/ crank relay energized Instrument panel cluster (ipc) J215 (in body harness, approximately 14 cm (5.5 in) to right of stop lamp switch breakout in main harness) J251 Logic Low reference M/t Off On/ Pnk Power distribution system Res+ Set- Stop fuse 54 15a Stop lamp control Stop lamp switch (above brake pedal assembly) Tac motor control-1 Tac motor control-2 Tan Throttle body (top of engine, mounted on upper air intake manifold) Tp sensor 1 signal Tp sensor 2 signal Transmission control module (tcm) Turn signal/multi-function switch Underhood fuse block (above left front wheelwell) Vehicle speed sensor (vss) (left rear of transfer case) Vss high signal Vss low signal
DEFOGGERS Defoggers Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Defoggers Wiring Diagram for Hummer H3 Alpha 2008: 27 A x1 A x2 A10 A24 A32 Body control module (bcm) (behind right front kick panel) Defogger indicator G105 (on left inner front wheelwell, behind battery) G300 (under driver seat carpet, on floor board) G350 (behind left rear quarter trim, near wheelwell) Ground Hot at all times Hvac control module (beneath radio) Ind ctrl J251 J900 Logic R/wdo defg fuse 30 20a Rear defog indicator ctrl Rear defog switch sig Rear defogger switch Rear window defogger Relay cntrl Rr defog relay 71 Sw sig Tan Underhood fuse block (above left front wheelwell)
ENGINE PERFORMANCE
3.7L VIN E 3.7L VIN E, Engine Performance Wiring Diagram (1 of 5) for Hummer H3 Alpha 2008 List of elements for 3.7L VIN E, Engine Performance Wiring Diagram (1 of 5) for Hummer H3 Alpha 2008: 49 (behind right front kick panel) body control module (bcm) (in chassis harness, approximately 22.5 cm (8.9 in) from fuel pump & sender assembly connector) j359 4wd low signal 5v ref 1 5v ref 2 A/c compressor clutch rly ctrl Acc Accelerator pedal position (app) sensor (on accelerator pedal bracket) Accy volt Air conditioning system Air solenoid relay control Anti-theft system App sensor 1 signal App sensor 2 signal Battery positive voltage Class 2 serial data Cnstr vent fuse 31 10a Computer data lines system Cruise control release signal Cruise control switch signal Cruise control system Engine control module (ecm) (right rear corner of engine compt) Evap canister vent sol ctrl Fuel level sensor signal Fuel pump relay control Fuel tank pressure (ftp) sensor (top of fuel pump & sender assembly) Fuel tank pressure sensor signal Hot at all times Ignition switch Ignition voltage J201 Low ref Low reference Mil control Off Pnk Powertrain relay control Run Sound systems Start Starter enable relay control Starting/charging system Stop fuse 54 15a Stop lamp control Stop lamp switch (above brake pedal assembly) Tan Transmissions system Underhood fuse block (above left front wheelwell) Vehicle speed signal 3.7L VIN E, Engine Performance Wiring Diagram (2 of 5) for Hummer H3 Alpha 2008 List of elements for 3.7L VIN E, Engine Performance Wiring Diagram (2 of 5) for Hummer H3 Alpha 2008: 31 (on lower left side of engine block, forward of g102) g103 Air pump fuse 62 60a Air sol fuse 44 15a Air sol relay Clstr fuse 10a Computer data lines system Engine oil ind Etc fuse 15a Evaporative emission (evap) canister vent solenoid valve (above spare tire) Fuel pump & sender assembly (mounted on top of fuel tank) Fuel pump relay Fuel/pump fuse 3 15a G103 (on lower left side of engine block, forward of g102) G105 (on left inner front wheelwell, behind battery) G420 (mounted to left side of rear cross member, near x420) Hot at all times Instrument panel cluster (ipc) Logic Mil ind Nca O2 snsr fuse 47 15a Pcm-b fuse 25 10a Pnk Pwr/trn relay 81 Red Secondary air injection (air) pump (w/ electric air injection reactor) (mounted to right front side of radiator support) Secondary air injection (air) pump relay (top of engine, at rear of intake) Secondary air injection (air) solenoid (w/ electric air injection reactor) (right side of engine, above exhaust) Serial data Underhood fuse block (above left front wheelwell) Up shift ind 3.7L VIN E, Engine Performance Wiring Diagram (3 of 5) for Hummer H3 Alpha 2008 List of elements for 3.7L VIN E, Engine Performance Wiring Diagram (3 of 5) for Hummer H3 Alpha 2008: 37 (attached to fuel rail) fuel injectors (in center front of cam cover) 5v reference 5v reference 1 A pnk Air conditioning system Air relay control Anti-lock brakes system Clutch position sensor (m/t) (at top of clutch pedal assembly) Computer data lines system Delivered torque Duty cycle signal Engine control module (ecm) (right rear corner of engine compt) Evap canister purge Generator Generator field High speed gmlan Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 J103 pnk (in engine compt harness, near grille lamps relay, by master cylinder) Low reference Nca Pnk Pnp/clutch Regulator ctrl Requested torque signal Serial data bus + Serial data bus - Signal Solenoid control Spark plug Start sw sig Starting/charging system Tan 3.7L VIN E, Engine Performance Wiring Diagram (4 of 5) for Hummer H3 Alpha 2008 List of elements for 3.7L VIN E, Engine Performance Wiring Diagram (4 of 5) for Hummer H3 Alpha 2008: 28 (on lower left side of engine block, forward of g102) g103 (top of engine, mounted on upper air intake manifold) throttle body A/c refrigerant Air conditioning system Air injection reaction ctrl valve ctrl Air pump rly fuse 17 10a Cpp sensor signal Ect sensor signal Eng cntrl sys fuse 22 15a Engine control module (ecm) (right rear corner of engine compt) Engine coolant temperature (ect) sensor (front left of engine) Evaporative emission (evap) canister purge solenoid valve (below intake, in back of alternator) Hot w/ run/crnk relay 78 energized Ign 1 fuse 33 15a Inj fuse 23 15a Instrument cluster system Manifold absolute pressure (map) sensor (at top right side rear of engine, on intake manifold) Map sensor signal Nca Oil press sw sig Pcm-i fuse 21 10a Pnk Press sens sig Tan Underhood fuse block (above left front wheelwell) Vehicle speed sensor (vss) (m/t) (left rear of transfer case) Vss high signal Vss low signal 3.7L VIN E, Engine Performance Wiring Diagram (5 of 5) for Hummer H3 Alpha 2008 List of elements for 3.7L VIN E, Engine Performance Wiring Diagram (5 of 5) for Hummer H3 Alpha 2008: 45 (on lower left side of engine block, rearward of g103) g102 5v ref 2 Camshaft position (cmp) actuator solenoid valve Camshaft position (cmp) sensor Ckp sensor signal Cmp actuator solenoid Cmp sensor sig Crankshaft position (ckp) sensor (left rear of engine block, below starter) Engine control module (ecm) (right rear corner of engine compt) Fuel injector 1 control Fuel injector 2 control Fuel injector 3 control Fuel injector 4 control Fuel injector 5 control Ground Heated oxygen sensor (ho2s) 1 (on exhaust manifold on left side of engine) Heated oxygen sensor (ho2s) 2 (in exhaust pipe, adjacent to transmission) Ho2s heater high ctrl sens 1 Ho2s heater low ctrl sens 2 Ho2s high signal sensor 1 Ho2s high signal sensor 2 Ho2s low signal sensor 1 Ho2s low signal sensor 2 Iat sensor signal Ic 1 control Ic 2 control Ic 3 control Ic 4 control Ic 5 control Ignition voltage Instrument cluster system Knock sensor (ks) (below intake manifold, near front of engine) Knock sensor signal Low ref Low reference Maf sensor signal Mass air flow (maf)/ intake air temperature (iat) sensor (between air cleaner & throttle body) Nca Pnk Red Tac motor control 1 Tac motor control 2 Tp sensor 1 signal Tp sensor 2 signal X3 underhood fuse block (above left x3 front wheelwell)
5.3L VIN L 5.3L VIN L, Engine Performance Wiring Diagram (1 of 5) for Hummer H3 Alpha 2008 List of elements for 5.3L VIN L, Engine Performance Wiring Diagram (1 of 5) for Hummer H3 Alpha 2008: 49 (behind right front kick panel) body control module (bcm) (in chassis harness, approximately 22.5 cm (8.9 in) from fuel pump & sender assembly connector) j359 4wd low signal 5v ref 1 5v ref 2 A/c compressor clutch rly ctrl Acc Accelerator pedal position (app) sensor (on accelerator pedal bracket) Accy volt Air conditioning system Anti-theft system App sensor 1 signal App sensor 2 signal Battery positive voltage Class 2 serial data Cnstr vent fuse 31 10a Computer data lines system Cruise control release signal Cruise control switch signal Cruise control system Engine control module (ecm) (right rear corner of engine compt) Evap canister vent sol ctrl Evaporative emission (evap) canister vent solenoid valve (above spare tire) Fuel level sensor signal Fuel pump relay control Fuel tank pressure (ftp) sensor (top of fuel pump & sender assembly) Fuel tank pressure sensor signal Hot at all times Ignition switch Ignition voltage J201 Low ref Low reference Mil control Off Pnk Powertrain relay control Run Sound systems Start Starter enable relay control Starting/charging system Stop fuse 54 15a Stop lamp control Stop lamp switch (above brake pedal assembly) Tan Transmissions system Underhood fuse block (above left front wheelwell) Vehicle speed signal 5.3L VIN L, Engine Performance Wiring Diagram (2 of 5) for Hummer H3 Alpha 2008 List of elements for 5.3L VIN L, Engine Performance Wiring Diagram (2 of 5) for Hummer H3 Alpha 2008: 31 A/c refrigerant Air conditioning system Clstr fuse 10a Computer data lines system Ect sensor signal Engine control module (ecm) (right rear corner of engine compt) Engine coolant temperature (ect) sensor (front left of engine) Engine oil ind Etc fuse 15a Fuel pump & sender assembly (mounted on top of fuel tank) Fuel pump relay Fuel/pump fuse 3 15a G105 (on left inner front wheelwell, behind battery) G420 (mounted to left side of rear cross member, near x420) Hot at all times Instrument cluster system Instrument panel cluster (ipc) Logic Manifold absolute pressure (map) sensor (top of engine, above intake manifold) Map sensor signal Mil ind Nca O2 snsr fuse 47 15a Oil press sw sig Pcm-b fuse 25 10a Pnk Press sens sig Pwr/trn relay 81 Serial data Tan Underhood fuse block (above left front wheelwell) 5.3L VIN L, Engine Performance Wiring Diagram (3 of 5) for Hummer H3 Alpha 2008 List of elements for 5.3L VIN L, Engine Performance Wiring Diagram (3 of 5) for Hummer H3 Alpha 2008: 43 (top of cylinder head) (upper right side of engine) fuel injectors 5v reference 5v reference 1 A pnk Air conditioning system Anti-lock brakes system Bank 2 & sens 1 Bank 2 & sens 2 C red Computer data lines system D pnk Delivered torque Duty cycle signal Engine control module (ecm) (right rear corner of engine compt) Evap canister purge Generator field Heated oxygen sensor (ho2s) bank 2 & sensor 1 (left side exhaust, after catalytic converter) Heated oxygen sensor (ho2s) bank 2 & sensor 2 (right side exhaust, after catalytic converter) High speed gmlan Ho2s heater low Ignition coil 1 Ignition coil 3 Ignition coil 5 Ignition coil 7 J113 J114 J118 Low reference Nca Pnk Pnp/clutch Red Regulator ctrl generator Requested torque signal Serial data bus + Serial data bus - Signal Solenoid control Spark plug Start sw sig Starting/ charging system Tan 5.3L VIN L, Engine Performance Wiring Diagram (4 of 5) for Hummer H3 Alpha 2008 List of elements for 5.3L VIN L, Engine Performance Wiring Diagram (4 of 5) for Hummer H3 Alpha 2008: 26 (on lower left side of engine block, forward of g102) g103 (top of cylinder head) (top of engine, mounted on upper air intake manifold) throttle body Eng cntrl sys fuse 22 15a Evaporative emission (evap) canister purge solenoid valve (top of intake manifold near rear of throttle body) Fuel injectors (upper left side of engine) G103 (on lower left side of engine block, forward of g102) Hot w/ run/crnk relay 78 energized Ign 1 fuse 33 15a Ignition coil 2 Ignition coil 4 Ignition coil 6 Ignition coil 8 Inj fuse 23 15a J111 J116 J117 Nca Pcm-i fuse 21 10a Pnk Pnk a Pnk d Red Red c Spark plug Underhood fuse block (above left front wheelwell) 5.3L VIN L, Engine Performance Wiring Diagram (5 of 5) for Hummer H3 Alpha 2008 List of elements for 5.3L VIN L, Engine Performance Wiring Diagram (5 of 5) for Hummer H3 Alpha 2008: 53 (on lower left side of engine block, rearward of g103) g102 5v ref 1 5v ref 2 Camshaft position (cmp) sensor (front of engine above crank pulley) Ckp sensor signal Cmp sensor signal Crankshaft position (ckp) sensor (mounted to right rear of engine block behind starter motor) Engine control module (ecm) (right rear corner of engine compt) Engine) Fuel injector 1 control Fuel injector 2 control Fuel injector 3 control Fuel injector 4 control Fuel injector 5 control Fuel injector 6 control Fuel injector 7 control Fuel injector 8 control Ground Heated oxygen sensor (ho2s) bank 1 & sensor 1 (left side exhaust, before catalytic converter) Heated oxygen sensor (ho2s) bank 1 & sensor 2 (right side exhaust, before catalytic converter) Ho2s heater low bank 1 sens 1 Ho2s heater low bank 1 sens 2 Ho2s high sig bank 1 sens 1 Ho2s high sig bank 1 sens 2 Ho2s low sig bank 1 sens 1 Ho2s low sig bank 1 sens 2 Iat sensor signal Ic 1 control Ic 2 control Ic 3 control Ic 4 control Ic 5 control Ic 6 control Ic 7 control Ic 8 control Ignition voltage Instrument cluster system Knock sensor (ks) 1 (lower left side of b Knock sensor (ks) 2 (lower right side of engine) Knock sensor 1 signal Knock sensor 2 signal Low reference Maf sensor signal Mass air flow (maf) sensor/intake air temperature (iat) sensor (between air cleaner & throttle body) Oil pressure sensor signal Pnk Red Tac motor control 1 Tac motor control 2 Tan Tp sensor 1 signal Tp sensor 2 signal X3 underhood fuse block (above left x3 front wheelwell)
EXTERIOR LIGHTS Backup Lamps Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Backup Lamps Wiring Diagram for Hummer H3 Alpha 2008: 24 A nca A/t Backup lamp switch (on top of transmission) Bck/up fuse 28 15a Bkup Electronic brake control module (ebcm) (left of master cylinder) G105 (on left inner front wheelwell, behind battery) G340 (behind right rear quarter trim, near wheelwell) G350 (behind left rear quarter trim, near wheelwell) Harness into breakout to sunroof) j224 Hot at all times Hot in run or start Inside rearview mirror J314 J315 Left backup lamp Left tail/ stop & turn signal lamp M/t Nca Park/neutral position (pnp) switch (left side of automatic transmission) Right backup lamp Right tail/ stop & turn signal lamp Run/ crank relay 78 Underhood fuse block (above left front wheelwell) Exterior Lamps Wiring Diagram (1 of 3) for Hummer H3 Alpha 2008 List of elements for Exterior Lamps Wiring Diagram (1 of 3) for Hummer H3 Alpha 2008: 52 A10 A19 A24 A26 A28 A37 A45 A48 Auto Body control module (bcm) (behind right front kick panel) Bulb out Center high mounted stop lamp (chmsl) Dealer installed Dimm sw sig Frt trn/ hazrd/ctsy mir fuse 56 15a Frt/prk fuse 43 10a G105 (on left inner front wheelwell, behind battery) G106 (on right inner front wheelwell) G350 (behind left rear quarter trim, near wheelwell) Haz sw sig Hazard switch Headlamp switch Hot at all times Interior lights system J109 J185 J205 J900 Left Left front marker lamp Left front park/ turn signal lamp Low ref Lr prk lp Off Park Prk lmp rly Prk lmp sw Prk/lp relay 89 Rap rly cntrl Rear trn/ hazrd fuse 20 20a Red Right Right front marker lamp Right front park/ turn signal lamp Stop fuse 54 15a Stop lamp switch (above brake pedal assembly) Stp lp volt To lr prk fuse 37 (diagram 2 0f 3) Trn sig sw Turn signal/ multi-function switch Turn switch Underhood fuse block (above left front wheelwell) Exterior Lamps Wiring Diagram (2 of 3) for Hummer H3 Alpha 2008 List of elements for Exterior Lamps Wiring Diagram (2 of 3) for Hummer H3 Alpha 2008: 27 (approximately 18 cm (7 in) from breakout to x204) j305 Electronic brake control module (ebcm) (left of master cylinder) Engine control module (ecm) (right rear corner of engine compt) From a frt/prk fuse 43 (diagram 1 0f 3) G105 (on left inner front wheelwell, behind battery) G340 (behind right rear quarter trim, near wheelwell) G350 (behind left rear quarter trim, near wheelwell) G420 (mounted to left side of rear cross member, near x420) Instrument panel cluster (ipc) J309 J314 J315 Left tail/ stop & turn signal lamp Left turn ind License lamp Logic Lr prk fuse 37 10a Red Right tail/ stop & turn signal lamp Right turn ind Roof marker lamps (w/ roof mounted marker lamp) Rr prk fuse 49 10a Stp lmp volt Trlr fuse 55 10a Underhood fuse block (above left front wheelwell) W/ trailer connector W/o trailer connector Exterior Lamps Wiring Diagram (3 of 3) for Hummer H3 Alpha 2008 List of elements for Exterior Lamps Wiring Diagram (3 of 3) for Hummer H3 Alpha 2008: 35 (in dealer installed off road harness, under roof-mounted light bar near drivers side lamp connector) j302 (near left side grille lamp connector) j105 (under roof- mounted light bar near drivers side lamp connector) j301 Backup lamps circuit E-brake fuse 83 30a G105 (on left inner front wheelwell, behind battery) G106 (on right inner front wheelwell) G420 (mounted to left side of rear cross member, near x420) Grille guard fuse 2 20a Grille lamps relay (below side air inlet cover) Hot at all times J101 J102 (in dealer installed off road harness, 1.5 cm (5.9 in) from roof lamps relay, near master cylinder) J103 (near grille lamps relay, by master cylinder) J205 Lamp connector) Left off road grille lamp Left off road roof lamp Off road grille lamp switch Off road roof lamp switch Off road roof lamps relay (below side air inlet cover) Rap/accy relay 88 Red Right off road grille lamp Right off road roof lamp Roof lp fuse 4 20a Spo fuse 10 10a Trailer connector (if equipped) (mounted on left side of trailer receiver, rear of vehicle) Trlr b+ fuse 84 30a Trlr bck/up fuse 42 10a Underhood fuse block (above left front wheelwell) W/ off road radiator grille guard lamp, dealer installed W/ roof mounted off road lamp, dealer installed W/ trailer connector W/o trailer connector
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 3) for Hummer H3 Alpha 2008 List of elements for Ground Distribution Wiring Diagram (1 of 3) for Hummer H3 Alpha 2008: 51 3.7l only, 5.7l information not available 87a A/c clutch diode A/c compressor clutch A/t Battery Brake fluid level switch Electronic brake control module (ebcm) Engine control module (ecm) Fog/lp relay 69 Fuel/pump relay 66 G100 (in engine compt, mounted to left front inner fender, behind battery) G102 (on lower left side of engine block, rearward of g103) G103 (on lower left side of engine block, forward of g102) G104 (left side of engine block, in front of starter) G105 (on left inner front wheelwell, behind battery) G110 (left side of engine block, forward of g103) G120 (on left lower inner wheelwell, near engine mount) Generator battery control module Hi/lo beam relay 70 Hi/low wpr relay 73 Horn assembly If equipped Ignition coil/ module 1 Ignition coil/ module 2 Ignition coil/ module 3 Ignition coil/ module 4 Ignition coil/ module 5 J110 (in body harness near ebcm, approximately 7.5 cm (3 in) back from ebcm) J185 (in forward lamp harness, approximately 25 cm (9.8 in) from x115) Left front fog lamp Left front marker lamp Left park/turn signal lamp Mass air flow (maf)/ intake air temperature (iat) sensor Nca On/off wpr relay 72 Park/ neutral position (pnp) switch Right front fog lamp Right front marker lamp Right park/turn signal lamp Rr defog relay 71 Run/ crank relay 78 Secondary air injection (air) pump Secondary air injection (air) pump solenoid Sunroof motor Sunroof switch Transmission control module (tcm) Underhood fuse block (above left front wheel- well) Underhood fuse block (above left front wheelwell) W/ electric air injection reactor Wind- shield wiper motor Ground Distribution Wiring Diagram (2 of 3) for Hummer H3 Alpha 2008 List of elements for Ground Distribution Wiring Diagram (2 of 3) for Hummer H3 Alpha 2008: 39 Automatic transmission shift lever Center high mounted stop lamp (chmsl) Driver back heated seat element Driver door lock/ window switch Driver seat adjuster switch Driver seat lumbar adjuster switch Fuel pump & sender assembly G340 (behind right rear quarter trim, near wheelwell) G345 (convenience package decor level 3) (behind left rear quarter trim, near wheelwell) G350 (behind left rear quarter trim, near wheelwell) G420 (mounted to left side of rear cross member, near x420) J306 (in driver seat harness in breakout to lumbar adjuster/heater switch) J314 (in body harness, approximately 44.5 cm (17.5 in) rearward of breakout to left seat belt pretensioner) J316 (in passenger seat harness, approximately 5 cm (2 in) before breakout to seat adjuster & lumbar adjuster/heater switches) J317 (in passenger seat heater element jumper harness) J318 (in passenger seat heater element jumper harness) J514 (in driver door harness, approximately 6.5 cm (2.6 in) before breakouts to door lock & window switch) J900 (in endgate harness, approximately 19.5 cm (7.7 in) rearward of endgate grommet) Left back-up lamp Left rear window switch Left tail/ stop & turn signal lamp License lamp Nca Outside rearview mirror switch Passenger back heated seat element Passenger cushion heated seat element Passenger door lock/ window switch Passenger heated seat control module Passenger seat adjuster switch Passenger seat lumbar adjuster switch Rear accessory power outlet Rear window defogger Rear window wiper motor Right back-up lamp Right rear window switch Right tail/ stop & turn signal lamp Trailer connector W/ hd truck trailer wiring W/o hd truck trailer wiring Ground Distribution Wiring Diagram (3 of 3) for Hummer H3 Alpha 2008 List of elements for Ground Distribution Wiring Diagram (3 of 3) for Hummer H3 Alpha 2008: 53 (if equipped) inflatable restraint vehicle rollover sensor (if equipped) rear view camera image display module A12 Accessory switch Audio amplifier B10 Body control module (bcm) Breakout to left footwell lamp) Convenience package decor level 3 Data link connector (dlc) Digital radio receiver Dome/ reading lamps Driver door jamb switch Driver seat belt switch Except convenience package decor level 3 G106 (on right inner front wheelwell) G300 (under driver seat carpet, on floor board) G310 (mounted under left side of passenger seat) G320 (under rear of middle console carpet, on floor board) Garage door opener (gdo) Hazard switch Headlamp dimmer switch High speed blower motor relay Hvac control module I/p accessory power outlet 1 I/p accessory power outlet 2 Ignition lock cylinder control actuator Inflatable restraint front passenger presence system (pps) module Inflatable restraint sensing & diagnostic module (sdm) Inside rearview mirror Instrument panel cluster (ipc) J206 (in i/p harness, approximately 7 cm (2.8 in) right of breakout to right footwell lamp) J300 (in body harness, approximately 20 cm (7.9 in) forward of left rocker channel cover) J320 (in body harness rear seat area along sill, approximately 20 cm (7.9 in) rearward of breakout to g320) J340 (in dome lamp jumper harness, approximately 10 cm (3.9 in) before breakout to right sunshade) Left rear door jamb switch Left sunshade Liftgate ajar switch Passenger door jamb switch Passenger seat belt switch Pnk Radio Rear window wiper/washer switch Right rear door jamb switch Right sunshade Steering wheel position sensor Theft deterrent module (tdm) Transfer case shift control module Turn signal/ multifunction switch Vehicle communication interface module (vcim) W/ active brake control Windshield washer fluid pump Yaw & lateral accelerometer sensor
HEADLIGHTS Headlights Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Headlights Wiring Diagram for Hummer H3 Alpha 2008: 67 (in forward lamp harness, near center point of top of radiator, approximately 58 cm (22.8 in) from x115) (in forward lamp harness, near left upper radiator support, approximately 48.5 cm (19.1 in) from x115) 87a A10 A18 A31 A36 A37 A39 A43 Ambient light sensor (right side of dash upper trim panel) Ambient lt sens Auto Body control module (bcm) (behind right front kick panel) Class 2 data Class 2 ser data Class 2 serial data Drl fuse 39 10a Drl ind logic Drl relay Drl rly ctrl Flash to pass Fog lmp ind Fog lp rly ctrl Fog lp sw sig Fog/lp fuse 24 15a Fog/lp relay Front fog lamp ind Front fog lamp switch G105 (on left inner front wheelwell, behind battery) G106 (on right inner front wheelwell) Hdlp dim sw sig Hdlp off sig Hdlp on sig Hdlp relay Hdlp rly ctrl Head on Headlamp dimmer switch Headlamp switch Hi bm rly ctrl Hi/lo beam relay 70 High beam High beam ind Hot at all times Ign Instrument panel cluster J112 J120 J134 J145 J185 J205 Left front fog lamp Left head- lamp Lh hdlp fuse 41 10a Low ref Off Park Park brake switch (left lower side of dash) Pk brake sw sig Pnk Red Rh hdlp fuse 40 10a Right front fog lamp Right head- lamp Turn signal/ multi-function switch Underhood fuse block (above left front wheelwell)
HORN Horn Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Horn Wiring Diagram for Hummer H3 Alpha 2008: 16 A25 A40 Body control module (behind right front kick panel) G105 (on left inner front wheelwell, behind battery) Horn (front of vehicle, behind grill) Horn contact in Horn fuse 36 10a Horn relay 74 Horn rly cntrl Horn switch Hot at all times J185 Nca Turn signal cancel cam Turn signal/ multi-function switch Underhood fuse block (above left front wheelwell)
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Instrument Cluster Wiring Diagram for Hummer H3 Alpha 2008: 93 (right rear corner of engine compt) engine control module (ecm) (under driver seat carpet, on floor board) g300 3.7l 5 volt ref 1 5.3l A nca A19 A26 A31 A38 A39 A41 A42 A44 A47 Abs ind Accessory switch Air bag ind B nca Battery Body control module (bcm) (behind right front kick panel) Brake fluid level switch (on left side of brake fluid reservoir) Brake ind Brk fluid lvl C nca Charging ind Chime Clstr fuse 19 10a Computer data lines system Cruise ind Driver information center (dic) Driver seat belt buckle Driver seat belt switch Ect sense Electronic brake control module (ebcm) (left of master cylinder) Engine controls system Engine coolant Engine coolant temper- ature gauge Engine oil pressure (eop) sensor (5.3l) (top of engine near rear of intake manifold) Engine oil pressure (eop) switch (3.7l) (above oil filter) Fuel gauge Fuel level Fuel pump & sender assembly (mounted on top of fuel tank) G105 (on left inner front wheelwell, behind battery) G106 (on right inner front wheelwell) G310 (mounted under left side of passenger seat) Ground High beam ind Hot at all times Ign Illumination (4 bulbs) Inflatable restraint sensing & diagnostic module (sdm) (beneath lower console) Instrument panel cluster (ipc) J110 J205 J251 J310 J358 Left turn ind Logic Low ref Low tire pressure ind Lr turn lamp Malfunction ind Mil Nca Oil gauge Oil press Oil pressure ind Park brake switch (left lower side of dash) Passenger seat belt buckle Passenger seat belt ind Passenger seat belt switch Pnk Prk brk sw Red Right turn ind Rr turn lamp Seat belt ind Seat belt sw Security ind Sensor sig Serial data Speedo- meter Tacho- meter Tan Temperature (ect) sensor (front left of engine) Traction control ind Trip/ odometer Trip/ reset switch Underhood fuse block (above left front wheelwell) Up shift ind Volts
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Courtesy Lamps Wiring Diagram for Hummer H3 Alpha 2008: 66 A10 A11 A12 A24 A30 A32 A38 A39 A40 A41 A44 A46 A47 Approximately 5 cm (2 in) before breakout to dome/ reading lamp) j350 Battery Bcm fuse 14 10a Body control module (bcm) (behind right front kick panel) Dome lamp Dome on switch Dome override switch Dome/ reading lamps Driver door ajar switch (in lower left "b" pillar) Driver door lock/ window switch x1 Endgate ajar switch (in right "d" pillar) Fr/prk fuse 43 10a Frt turn/ hazard/ ctsy mir fuse 56 15a G106 (on right inner front wheelwell) G300 (under driver seat carpet, on floor board) G320 (under rear of middle console carpet, on floor board) G340 (behind right rear quarter trim, near wheelwell) G350 (behind left rear quarter trim, near wheelwell) Headlamp switch Hot at all times J209 J300 J315 J320 J330 (in dome lamp jumper harness, approximately 5 cm (2 in) before breakout to right sunshade) b J340 J347 (in body harness, approximately 42 cm (16.5 in) rearward of breakout to right seat belt pretensioner) J514 Lamp ctrl Lamp sw sig Left i/p courtesy lamp Left rear door ajar switch (in lower left "c" pillar) Left sunshade (w/ convenience package decor level 3) Left vanity mirror lamp Lf door ajar Low ctrl Low ref Lr door ajar Override sw Passenger door ajar switch (in lower right "b" pillar) Passenger door lock/ window switch Pk lp ctrl Power ctrl Prk/lp relay Rf door ajar Right i/p courtesy lamp Right rear door ajar switch (in lower right "c" pillar) Right sunshade (w/ convenience package decor level 3) Right vanity mirror Rr door ajar Underhood fuse block (above left front wheelwell) W/ convenience package decor level 3 W/o convenience package decor level 3 Instrument Illumination Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Instrument Illumination Wiring Diagram for Hummer H3 Alpha 2008: 52 (5 bulbs) (not used) A10 A24 A27 A28 A29 A30 A33 A34 A36 A48 Accessory switch Auto Back lighting Battery Bcm fuse 14 10a Body control module (bcm) (behind right front kick panel) Dim control Dim sw sig Driver door lock/ window switch x1 Frt/prk fuse 43 10a G105 (on left inner front wheelwell, behind battery) G106 (on right inner front wheelwell) G340 (behind right rear quarter trim, near wheelwell) G350 (behind left rear quarter trim, near wheelwell) Hazard switch Head Headlamp switch Hot at all times Hvac module (beneath radio) Instrument panel lamps dimming control J205 J209 J210 J315 J514 Low ref Lr prk fuse 37 10a Off Park Passenger door lock/ window switch Pk lp ctrl Prk/lp relay Radio Rear window wiper/washer switch Sunroof switch Sw sig Underhood fuse block (above left front wheelwell) W/ sunroof W/o sunroof X204
NAVIGATION Navigation Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Navigation Wiring Diagram for Hummer H3 Alpha 2008: 21 Backup lp sig Bare Camera ctrl Camera gnd Camera sig Camera sig + Camera sig - Camera video Drain wire Exterior lights system G300 (under driver seat carpet, on floor board) Ground Hot w/ run/crank relay energized Ign voltage Image display module Inside rearview mirror (isrvm) J251 Pnk Rearview camera Spare 6 fuse 18 10a Underhood fuse block (above left front wheelwell)
POWER DISTRIBUTION Power Distribution Wiring Diagram (1 of 4) for Hummer H3 Alpha 2008 List of elements for Power Distribution Wiring Diagram (1 of 4) for Hummer H3 Alpha 2008: 85 (above left front wheelwell) underhood fuse block (approximately 2 cm (0.8 in) before breakout to x125) (approximately 24.5 cm (9.6 in) rearward of body pass through in breakout to left door) j264 (behind right rear quarter trim, near wheelwell) g340 (not used) (on right inner front wheel- well) g106 (on right inner front wheelwell) g106 Abs/vses1 -mtr fuse 67 40a Abs/vses2 -sol fuse 64 30a Amp fuse 38 25a Audio amplifier Automatic transmission shift control Aux pwr 1 fuse 51 20a Aux pwr 2 fuse 45 20a Battery Bcm fuse 10a Body control module Body control module (bcm) Clstr fuse 19 10a Cnstr vent fuse 31 10a Data link connector (dlc) Diode Driver door lock/ window switch Driver heated seat cushion element E-brake fuse 83 30a Electronic brake control module (ebcm) Engine control module (ecm) Evaporative emission (evap) canister vent solenoid valve From b aux pwr 1 fuse 51 (diagram 1 of 4) From c rear trn/ hazrd fuse 20 (diagram 1 of 4) Frt trn/ hazrd/ ctsy mir fuse 56 15a Generator Htd/seats fuse 1 20a Hvac control module I/p auxiliary power outlet Instrument panel cluster (ipc) J143 J205 J319 (in passenger seat heater element jumper harness) Left rear window switch Lt pwr wndw fuse 68 30a Megafuse fuse 91 125a Nca Passenger door lock/ window switch Passenger heated seat module Pcm cntrl relay Pcm-b fuse 25 10a Pwr s/roof fuse 57 30a Pwr/ lks fuse 8 20a Radio Rap/ accy relay Rdo fuse 13 10a Rear auxiliary power outlet Rear trn/hazrd fuse 20 20a Rear window washer fluid pump Rear window wiper module Rear window wiper/ washer switch Rear wpr switch/pump fuse 16 15a Rear/wpr mtr fuse 15 15a Red Right rear window switch Rt pwr wndw fuse 63 30a S/roof frt/wpr fuse 9 15a Sdars fuse 50 10a Spo fuse 10 10a Starter Stop fuse 54 15a Stop lamp switch Strtr fuse 30a Sunroof module Sunroof motor Tccm fuse 12 30a To onstar fuse (diagram 4 of 4) To pwr/ lock fuse 8 (diagram 1 of 4) To pwr/trn relay 81 (diagram 2 of 4) To rap/accy relay 88 (diagram 1 of 4) Trailer connector Transfer case shift control module Trlr b+ fuse 84 30a Turn signal/multi- function switch Underhood fuse block (above left front wheelwell) W/ electric sun, glass & sliding roof W/ hd truck trailer wiring harness W/ premium audio branded & amplifier speaker system Windshield wiper/washer switch Power Distribution Wiring Diagram (2 of 4) for Hummer H3 Alpha 2008 List of elements for Power Distribution Wiring Diagram (2 of 4) for Hummer H3 Alpha 2008: 56 (in driver seat harness, approximately 28.5 cm (11.2 in) back from x307) j312 (in passenger seat harness, approximately 10 cm (3.9 in) before breakout to seat adjuster & lumbar adjuster/heater switches) j341 1-2 shift solenoid (ss) valve 2-3 shift solenoid (ss) valve 3-2 shift solenoid (ss) valve A/t Accessory switch Air bag fuse 27 10a Air pump fuse 62 60a Air pump rly fuse 60a Cruise control release switch Cruise/misc fuse 35 10a Driver seat adjuster switch Drl fuse 39 10a Drl relay Fog/lp relay From fuel/ e pump relay 66 (diagram 2 of 4) From rap/ d accy relay 88 (diagram 1 of 4) Frt/wiper fuse 25a Fuel/ pump relay G105 (on left inner front wheelwell, behind battery) Generator battery control module Hdlp relay Horn relay If equipped Inflatable restraint front passenger presence system (pps) sensor Inflatable restraint sensing & diagnostic module (sdm) Inflatable restraint vehicle rollover sensor Inside rearview mirror J133 On/off wiper relay Passenger seat adjuster switch Passenger seat lumbar adjuster switch Pnk Power seat fuse holder Pwr seats fuse 61 40a Pwr/trn relay Rearview camera image display module Red Run/ crank relay Rvc pwr fuse 7 10a Rvc vsense+ fuse 32 10a Seat circuit breaker 25a Secondary air injection (air) pump relay Spare 6 fuse 18 10a To air cmprsr fuse 11 (diagram 3 of 4) To bck/up fuse 28 (diagram 3 of 4) To body control module (diagram 4 of 4) To run/ crank relay 78 (diagram 2 of 4) Torque converter clutch (tcc) solenoid valve Torque converter clutch pulse width modulation (tcc pwm) solenoid valve Trans fuse 34 10a Transmission control module (tcm) Turn signal/ multi-function switch Underhood fuse block (above left front wheelwell) W/ air injection electric reactor system Power Distribution Wiring Diagram (3 of 4) for Hummer H3 Alpha 2008 List of elements for Power Distribution Wiring Diagram (3 of 4) for Hummer H3 Alpha 2008: 68 (above left front wheelwell) underhood fuse block (approximately 15 cm (6 in) from x203) j220 (approximately 5 cm (0.2 in) before breakout to ebcm) j141 (in dealer installed off road harness, 1.5 cm (5.9 in) from roof lamps relay, near master cylinder) j101 (in engine compartment harness, near grille lamps relay, by master cylinder) j103 (not used) 3.7l 5.3l A/c clutch diode 90 A/c clutch fuse 48 10a A/c clutch relay A/c compressor clutch A/t A26 Abs/vses fuse 29 10a Accessory switch Air cmprsr fuse 11 25a Air sol fuse 44 15a Air sol relay Back-up lamp switch Bck/up fuse 28 15a Blower motor Body control module (bcm) Driver seat lumbar adjuster switch Electronic brake control module (ebcm) Eng cntrl sys fuse 22 15a Engine control module (ecm) Evaporative emission (evap) canister purge solenoid valve From i ign1 fuse 33 (diagram 3 of 4) From injector fuse 23 (diagram 3 of 4) From run/ crank relay 78 (diagram 2 of 4) From trans f fuse 34 (diagram 2 of 4) Fuel injector Grille guard fuse 2 20a High speed blower motor relay Hvac blwr fuse 82 30a Hvac cntrl hd fuse 59 10a Hvac control module Hvac relay Ign1 fuse 33 15a Ignition coil/ module Inj fuse 23 15a J111 J113 J116 J118 M/t Mass air flow (maf)/ intake air temperature (iat) sensor Nca Off road grill lamp relay (dealer installed) Off road roof lamp relay (dealer installed) Park/ neutral position (pnp) switch Passenger seat lumbar adjuster switch Pcm i fuse 21 10a Pnk Pwr htr switch fuse 53 10a Red Roof lp fuse 4 20a Rr defog relay Steering wheel position sensor Tccm switch fuse 58 10a To a/c clutch relay 76 (diagram 3 of 4) To batt ign sw fuse 5 (diagram 4 of 4) To eng cntrl sys fuse 22 (diagram 3 of 4) Underhood fuse block (above left front wheelwell) Vses/ abs fuse 52 10a W/ active brake control Yaw & lateral accelerometer sensor Power Distribution Wiring Diagram (4 of 4) for Hummer H3 Alpha 2008 List of elements for Power Distribution Wiring Diagram (4 of 4) for Hummer H3 Alpha 2008: 54 (in body harness under left door sill plate, approximately 41 cm (16.1 in) rearward of body pass through in main bundle) j309 (in body harness, approximately 6 cm (2.4 in) to right of stop lamp switch breakout in main harness) j209 (in forward lamp harness, approximately 43 cm (17 in) from x115) j109 10a 5-volts reference A14 A48 Acc Accessory voltage Batt ign switch fuse 5 10a Body control module (bcm) Body control module (bcm) (behind right front kick panel) Digital radio receiver Driver door lock/ window switch Engine control module (ecm) From battery a (diagram 1 of 4) From rr k defog relay 71 (diagram 3 of 4) From run/crank relay 78 (diagram 2 of 4) Frt/prk fuse 43 10a Ign Ignition switch J106 J200 J201 J234 (in i/p harness center dash area, approximately 5 cm (2 in) left of breakouts to hvac in main bundle) Left front marker lamp Left park/turn signal lamp Left rear window switch Left roof marker lamp Left tail/stop & turn signal lamp Lh prk fuse 37 10a License lamp Off Onstar fuse Passenger door lock/ window switch Prk/ lp relay Red Right front marker lamp Right park/turn signal lamp Right rear window switch Right tail/stop & turn signal lamp Rr prk fuse 49 10a Run Run/ crank voltage Start Theft deterrent module (tdm) Trailer connector Trlr fuse 55 10a Underhood fuse block (above left front wheelwell) Vehicle communication interface module (vcim) W/ digital audio W/ roof mounted marker lamp X1 b7 X2 a42
POWER DOOR LOCKS Power Door Locks Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Power Door Locks Wiring Diagram for Hummer H3 Alpha 2008: 53 (in body harness, approximately 3 cm (1.2 in) to left of park brake switch breakout) (in body harness, approximately 3 cm (1.2 in) to right of park brake switch breakout) j295 (not used) A11 A12 A38 A39 A41 A42 A44 A47 All doors lock ctrl All doors unlock ctrl Battery + Bcm fuse 14 10a Body control module (bcm) (behind right front kick panel) Class 2 serial data Computer data lines system Door unlock Door unlock ctrl Driver door lock actuator (in center rear of driver door, near door latch) Driver door lock/ window switch Driver door unlock ctrl Driver unlock relay Frt turn/ hazrd/ctsy mir fuse 56 15a G320 (under rear of middle console carpet, on floor board) G340 (behind right rear quarter trim, near wheelwell) G350 (behind left rear quarter trim, near wheelwell) Ground Hot at all times J244 (in body harness behind passenger side dash area, approximately 25 cm (9.8 in) before breakout to right front door) J294 J315 J320 J514 J529 (in driver door harness, approximately 7.5 cm (3 in) before breakout to power window motor) Left rear door lock actuator (in center rear of left rear door, near door latch) Liftgate door lock actuator (on right side of liftgate) Lock Lock relay Lock sw Logic Pass door lock ctrl Passenger door lock actuator (in center rear of passenger door, near door latch) Passenger door lock/ window switch Pwr/ lks fuse 8 20a Rear trn/ hazrd fuse 20 20a Right rear door lock actuator (in center rear of right rear door, near door latch) Tan Underhood fuse block (above left front wheelwell) Unlock Unlock ctrl Unlock relay
POWER MIRRORS Electrochromic Mirror Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Electrochromic Mirror Wiring Diagram for Hummer H3 Alpha 2008: 33 (under driver seat carpet, on floor board) g300 Ambient air temp sensor Ambient air temperature sensor (attached to front center of radiator support) Bare Camera signal + Camera signal - Cruise/ misc fuse 35 10a Drain wire Emergency switch Exterior lights system G105 (on left inner front wheelwell, behind battery) Green led Hot at all times Hot in run or start Ign Inside rearview mirror J300 Keypad Keypad ctrl Keypad green led sig Keypad red led sig Logic Low ref Navigation system Onstar button assembly Onstar switch Phone switch Pnk Red led Run/ crnk relay 78 Underhood fuse block (above left front wheelwell) Vehicle communication interface module (vcim) (center of dash below hvac control head) X1 sig Power Mirrors Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Power Mirrors Wiring Diagram for Hummer H3 Alpha 2008: 17 A29 Body control module (behind right front kick panel) Driver outside rearview mirror Frt trn/hazrd ctsy mir fuse 56 15a G350 (behind left rear quarter trim, near wheelwell) Horz Hot at all times J514 J590 (in driver door harness, approximately 7.5 cm (3 in) before breakout to osrvm) Left Nca Off Outside rearview mirror switch Passenger outside rearview mirror Right Underhood fuse block (above left front wheelwell) Vert
POWER SEATS Driver Heated Seat Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Driver Heated Seat Wiring Diagram for Hummer H3 Alpha 2008: 21 A26 Body control module (bcm) (behind right front kick panel) Driver back heated seat element (in driver seat back) Driver cushion heated seat element (in driver seat bottom) Driver heated seat module (in driver seat bottom) Driver seat lumbar adjuster switch G345 (behind left rear quarter trim, near wheelwell) High High/low status ind bulb Hot at all times Htd/seats fuse 1 20a Hvac relay Ign 3 rly coil J306 Low Nca Passenger heated seat circuit Pnk Pwr htr switch fuse 53 10a Red Underhood fuse block (above left front wheel well) Driver Power Seat Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Driver Power Seat Wiring Diagram for Hummer H3 Alpha 2008: 19 25a Back Driver seat adjuster motor assembly (under driver seat) Driver seat adjuster switch Front vertical Fuse holder power seat Fwd G345 (behind left rear quarter trim, near wheelwell) Horiz- ontal Hot at all times J306 J312 Lumbar circuit Nca Pwr seats fuse 61 40a Rear vertical Seat circuit breaker Tan Underhood fuse block (above left front wheel well) Lumbar Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Lumbar Wiring Diagram for Hummer H3 Alpha 2008: 20 25a Driver power seat circuit Driver seat lumbar adjuster switch Driver seat lumbar motor (in driver seat) Fuse holder power seat G345 (behind left rear quarter trim, near wheelwell) Hot at all times J306 J312 J316 J341 Nca Out Passenger power seat circuit Passenger seat lumbar adjuster switch Passenger seat lumbar motor (in passenger seat) Pnk Pwr seats fuse 61 40a Seat circuit breaker Underhood fuse block (above left front wheel well) Passenger Power Seat Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Passenger Power Seat Wiring Diagram for Hummer H3 Alpha 2008: 19 25a Front vertical Fuse holder power seat Fwd G345 (behind left rear quarter trim, near wheelwell) Horiz- ontal Hot at all times J312 J316 J341 Lumbar circuit Passenger seat adjuster motor assembly (under passenger seat) Passenger seat adjuster switch Pwr seats fuse 61 40a Rear vertical Rwd Seat circuit breaker Tan Underhood fuse block (above left front wheel well) Passenger"s Heated Seat Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Passenger"s Heated Seat Wiring Diagram for Hummer H3 Alpha 2008: 29 (not used) A26 Body control module (behind right front kick panel) C nca D nca Dr htd seat sw off sig Driver heated seats circuit G345 (behind left rear quarter trim, near wheelwell) High High/low status ind bulb Hot at all times Htd/seats fuse 1 20a Hvac relay Ign Ign 3 rly coil J316 J318 Logic Low Nca Passenger back heated seat element (in passenger seat back) Passenger cushion heated seat element (in passenger seat bottom) Passenger heated seat module (in passenger seat bottom) Passenger seat belt buckle Passenger seat lumbar adjuster switch Pnk Pwr htr switch fuse 53 10a Red Underhood fuse block (above left front wheel well)
POWER TOP/SUNROOF Power Top/Sunroof Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Power Top/Sunroof Wiring Diagram for Hummer H3 Alpha 2008: 22 Body control module (bcm) (behind right front kick panel) Closed G105 (on left inner front wheelwell, behind battery) Ground Hot at all times Ign volt Interior lights system J143 J210 Logic Motor Open Pwr s/roof fuse 57 30a Rap rly Rap/accy relay S/roof frt/wpr fuse 9 10a Sunroof actuator m Sunroof motor (at front of sunroof module) Sunroof switch Sw closed Sw open Underhood fuse block (above left front wheelwell)
POWER WINDOWS Power Windows Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Power Windows Wiring Diagram for Hummer H3 Alpha 2008: 33 (in body harness, approximately 11 cm (4.3 in) to right of stop lamp switch breakout in main harness) j213 Down Down relay Driver door lock/window switch Driver window motor (attached to interior of left front door) G340 (behind right rear quarter trim, near wheelwell) G350 (behind left rear quarter trim, near wheelwell) Hot w/ rap/accy relay 88 energized Interior lights system J247 J264 J314 J315 J514 Left rear window motor (attached to interior of left rear door) Left rear window switch Logic Lr down Lr up Lt pwr window fuse 68 30a Passenger door lock/window switch Passenger window motor (attached to interior of right front door) Rf down Rf up Right rear window motor (attached to interior of right rear door) Right rear window switch Rr down Rr up Rt pwr window fuse 63 30a Tan Underhood fuse block (above left front wheelwell) Up relay W/l
RADIO Base Radio Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Base Radio Wiring Diagram for Hummer H3 Alpha 2008: 45 A10 A11 A12 Audio comm sig B10 B11 B12 Bare Coax Common sig Computer data lines system Drain wire G106 (on right inner front wheelwell) G300 (under driver seat carpet, on floor board) Ground Hot at all times Instrument cluster system J205 J214 J251 Left aud sig Left audio sig Left front speaker Left front tweeter speaker Left rear speaker Lf out + Lf out - Lr out + Lr out - Radio Radio antenna Rdo fuse 13 10a Rf out + Rf out - Right aud sig Right front speaker Right front tweeter speaker Rr out + Rr out - Satellite radio circuit Serial data Tan Underhood fuse block (above left front wheelwell) Vehicle communication interface module (vcim) (center of dash below hvac control head) Vss Premium Radio Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008 List of elements for Premium Radio Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008: 43 A10 A11 A12 Audio comm sig B10 B11 B12 Bare Coax Common sig Computer data lines system Drain wire G106 (on right inner front wheelwell) G300 (under driver seat carpet, on floor board) Ground Hot at all times Instrument cluster system J205 J214 J251 Left aud sig Left audio sig Lf out + Lf out - Lr out + Lr out - Pnk Radio Radio antenna Radio mute Radio on sig Rdo fuse 13 10a Rf out + Rf out - Right aud sig Rr out + Rr out - Satellite radio circuit Serial data Tan Underhood fuse block (above left front wheelwell) Vehicle communication interface module (vcim) (center of dash below hvac control head) Vss Premium Radio Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008 List of elements for Premium Radio Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008: 41 Amp fuse 38 25a Audio amplifier (mounted next to subwoofer) G300 (under driver seat carpet, on floor board) Ground Hot at all times J300 L spk out + L spk out - Left front speaker Left front tweeter speaker Left rear speaker Left subwoofer Lf aud sig + Lf aud sig - Lf spkr out + Lf spkr out - Lr aud sig + Lr aud sig - Lr spkr out + Lr spkr out - Nca Pnk R spk out + R spk out - Radio mute sig Radio on sig Rf aud sig + Rf aud sig - Rf spkr out + Rf spkr out - Right front speaker Right front tweeter speaker Right rear speaker Right subwoofer Rr aud sig + Rr aud sig - Rr spkr out + Rr spkr out - Subwoofer speaker Tan Underhood fuse block (above left front wheelwell) Satellite Radio Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Satellite Radio Wiring Diagram for Hummer H3 Alpha 2008: 22 10a Antenna sig Aud common Audio common Bare Battery Cellular, navigation & digital radio antenna (mounted to right front roof area) Coax Digital radio receiver (right side of dash) Drain wire G300 (under driver seat carpet, on floor board) Ground Hot at all times J234 J251 Lt aud sig Lt aud sig+ Onstar fuse Radio Rt aud sig Rt aud sig+ Serial data
SHIFT INTERLOCK Ignition Lock Solenoid Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Ignition Lock Solenoid Wiring Diagram for Hummer H3 Alpha 2008: 12 Automatic transmission shift lever Body control module (bcm) (behind right front kick panel) G106 (on right inner front wheelwell) Hot at all times Ignition lock cylinder control actuator (on upper right side of steering column) J143 J205 Park position switch (closed in park) Rap relay Rap/accy relay 88 S/roof frt/wpr fuse 9 15a Underhood fuse block (above left front wheelwell) Shift Interlock Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Shift Interlock Wiring Diagram for Hummer H3 Alpha 2008: 23 (in body harness, approximately 14 cm (5.5 in) to right of stop lamp switch breakout in main harness) A31 x2 A37 A47 x1 Automatic transmission shift lever Automatic transmission shift lock control solenoid B+ voltage Bcm fuse 14 10a Body control module (bcm) (behind right front kick panel) Class 2 serial data Computer data lines system Engine control module (ecm) (right rear corner of engine compt) Exterior lights system G350 (behind left rear quarter trim, near wheelwell) Hot at all times J215 J314 Shift sol ctrl Stop fuse 54 15a Stop lamp control Stop lamp switch (above brake pedal assembly) Underhood fuse block (above left front wheelwell) X1 a7
STARTING/CHARGING Charging Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Charging Wiring Diagram for Hummer H3 Alpha 2008: 36 (on lower left side of engine block, rearward of g103) Batt pos vol Batt pos vol field duty cycle sig c Battery Charge indicator Class 2 Class 2 series data Clstr fuse 19 10a Computer data lines system Driver information center (dic) Engine control module (ecm) (right rear corner of engine compt) Field duty G100 (in engine compt, mounted to left front inner fender, behind battery) G102 G104 (left side of engine block, in front of starter) Generator Generator battery control module (left front of engine compt, near battery) Gnd Instrument panel cluster (ipc) J136 Logic Mega fuse fuse 91 125a Power distribution system Red Reg contrl Rvc pwr fuse 7 10a Rvc vsense+ fuse 32 10a Serial data Starter Turn on sig Underhood fuse block (above left front wheelwell) Used) (not Volt gauge X1 serial data X2 cycle sig X3 control regulator Starting Wiring Diagram, A/T for Hummer H3 Alpha 2008 List of elements for Starting Wiring Diagram, A/T for Hummer H3 Alpha 2008: 31 A x1 A x2 Acc Batt ign switch fuse 5 10a Battery Body control module (bcm) (behind right front kick panel) Engine control module (ecm) (right rear corner of engine compt) G100 (in engine compt, mounted to left front inner fender, behind battery) G102 (on lower left side of engine block, rearward of g103) G104 (left side of engine block, in front of starter) G105 (on left inner front wheelwell, behind battery) Ignition switch Ignition voltage J200 Off Park/neutral position (pnp) switch (left side of automatic transmission) Pcm 1 fuse 21 10a Pcm cntrl relay 77 Pnk Pnp/clutch start switch signal Power distribution system Red Run Run/crnk relay 78 Start Starter Starter enable relay control Strtr fuse 85 30a Underhood fuse block (above left front wheelwell) X1 b6 X2 b8 Starting Wiring Diagram, M/T for Hummer H3 Alpha 2008 List of elements for Starting Wiring Diagram, M/T for Hummer H3 Alpha 2008: 26 5v ref A14 A42 A47 Acc Battery Body control module (bcm) (behind right front kick panel) Computer data lines system Engine control module (ecm) (right rear corner of engine compt) G100 (in engine compt, mounted to left front inner fender, behind battery) G102 (on lower left side of engine block, rearward of g103) G104 (left side of engine block, in front of starter) Ign Ign volt Ignition switch Off Pcm cntrl relay Power distribution system Red Run Serial data Start Starter Strtr fuse 85 30a Tan Underhood fuse block (above left front wheelwell)
SUPPLEMENTAL RESTRAINTS Supplemental Restraints Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008 List of elements for Supplemental Restraints Wiring Diagram (1 of 2) for Hummer H3 Alpha 2008: 58 (on right inner front wheelwell) g106 Accessory switch Air bag fuse 27 10a Driver seat belt pretensioner (at left inner "b" pillar) G310 (mounted under left side of passenger seat) Gnd Hot w/ run/crank relay energized I/p stage 1-hi I/p stage 1-lo I/p stage 2-hi I/p stage 2-lo Ignition voltage Inflatable restraint i/p module (above dash compartment) Inflatable restraint passenger air bag on/off indicator Inflatable restraint sensing & diagnostic module (sdm) (beneath lower console) Inflatable restraint steering wheel module (in steering column) Inflatable restraint steering wheel module coil (mounted to steering wheel) J205 J310 Lh asf sig Lh asf volt Lh asf-hi Lh asf-lo Lh belt sw Lh pretens-hi Lh pretens-lo Lh sens sig Lh sens volt Nca Off Passenger seat belt indicator Passenger seat belt pretensioner (at right inner "b" pillar) Pin shorting bars engaged Pnk Pos rtrn Pos sensor-hi Red Rh asf sig Rh asf volt Rh asf-hi Rh asf-lo Rh belt sw Rh pretens-hi Rh pretens-lo Rh sens sig Rh sens volt Serial data Serial data link Shorting bar Stage 1 Stage 1-hi ctrl Stage 1-lo ctrl Stage 2 Stage 2-hi Stage 2-lo Tan Underhood fuse block (above left front wheelwell) When module connector is disconnected from harness (shorting bars are connected between pins: 6-7, 10-11, 12-13 & 14-15) Supplemental Restraints Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008 List of elements for Supplemental Restraints Wiring Diagram (2 of 2) for Hummer H3 Alpha 2008: 45 (behind right front kick panel) body control module (in body harness, approximately 13 cm (5.1 in) right of breakout to g310) (w/ head curtain air bag) j323 (left side of dash) data link connector (dlc) (mounted under left side of passenger seat) g310 A39 x2 A42 x1 Air bag ind Driver seat belt switch (part of seat belt buckle (driver)) G310 (mounted under left side of passenger seat) Gnd Ign Ign volt Ignition volt Inflatable restraint front passenger presence system (pps) module (on underside of cushion) Inflatable restraint front passenger presence system (pps) sensor (in front passenger seat cushion) Inflatable restraint vehicle rollover sensor (w/ head curtain air bag) (under center console) Instrument panel cluster (ipc) Ipc class 2 serial data J310 J310 (in body harness, approximately 4.5 cm (1.8 in) left of breakout to a/t floor shift control) J344 (in body harness, approximately 20 cm (7 in) to left of sdm breakout) Left inflatable restraint front end sensor (left lower radiator support) Left inflatable restraint roof rail module (w/ head curtain air bag) (upper left "b" pillar) Left inflatable restraint seat position sensor (on driver seat track) Left inflatable restraint side impact sensor (sis) (w/ head curtain air bag) (in left front door) Logic Low ref Nca Off ind On ind Passenger seat belt buckle Pnk Press sig Red Right inflatable restraint front end sensor (right lower radiator support) Right inflatable restraint roof rail module (w/ head curtain air bag) (upper right "b" pillar) Right inflatable restraint seat position sensor (on driver seat track) Right inflatable restraint side impact sensor (sis) (w/ head curtain air bag) (in right front door) Seat belt ind Serial Shorting bar Tan Tension sig Volt ref X2 a38
TRANSMISSION A/T Wiring Diagram for Hummer H3 Alpha 2008 List of elements for A/T Wiring Diagram for Hummer H3 Alpha 2008: 57 1-2 shift sol ctrl 1-2 shift solenoid (ss) valve 2-3 shift sol ctrl 2-3 shift solenoid (ss) valve 3-2 shift sol ctrl 3-2 shift solenoid (ss) valve Air pump rly fuse 17 10a Automatic transmission Automatic transmission fluid pressure manual valve position switch Automatic transmission fluid temperature (tft) sensor Computer data lines system Engine control module (ecm) (right rear corner of engine compt) Exterior lights system G102 (on lower left side of engine block, rearward of g103) Gnd Hi spd ser data bus + Hi spd ser data bus - Hi spd serial data + Hi spd serial data - Hot at all times Hot in on or start Ign volt In shaft spd sens Input speed sensor (iss) J133 Lo ref P/n Park/neutral position (pnp) switch (left side of automatic transmission) Pc sol valve hi ctrl Pc sol valve lo ctrl Pnk Pnp/clutch start sw sig x3 Power distribution system Pressure control (pc) solenoid valve Red Rev Stop lamp ctrl Tan Tcc pwm sol ctrl Tcc sol valve ctrl Tcm pwr fuse 26 10a Tft sens sig Torque converter clutch (tcc) pulse width modulation (pwm) solenoid valve Torque converter clutch (tcc) solenoid valve Trans fluid sw a Trans fluid sw b Trans fluid sw c Trans fuse 34 10a Trans range sw a Trans range sw b Trans range sw c Trans range sw p Transmission control module (tcm) Underhood fuse block (above left front wheelwell) Vehicle speed sensor (vss) (left rear of transfer case) Vss hi sig Vss lo sig Transfer Case Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Transfer Case Wiring Diagram for Hummer H3 Alpha 2008: 50 (on right inner front wheelwell) g106 4 hi 4 hi ind 4 hi lock 4 hi lock ind 4 lo ind 4 lo lock 4 lo lock ind 4wd ind 4wd lo sig 5v ref A encoder sig Accessory switch B encoder sig Bat Body control module (bcm) (behind right front kick panel) C encoder sig Computer data lines system Ctrl ign rly Diff lock Diff lock hi Diff lock ind Driver information center (dic) Encoder lo ref Engine control module (ecm) (right rear corner of engine compt) Gnd Hot at all times Hvac relay 87 Instrument panel cluster (ipc) Lo ref Logic Low sig 4wd Motor ctrl a Motor ctrl b Nca Neu ind ctrl Neutral ind P encoder sig Pnk Rear differential lock actuator (mounted to center of rear axle) Red Red/ Serial data Switch sig Tccm fuse 12 30a Tccm switch fuse 58 10a Transfer case encoder motor (part of transfer case) Transfer case shift control module (behind glove box) Underhood fuse block (above left front wheelwell) X1 a26
WARNING SYSTEMS Warning Systems Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Warning Systems Wiring Diagram for Hummer H3 Alpha 2008: 69 (in body harness, approximately 42 cm (16.5 in) rearward of breakout to right seat belt pretensioner) j347 A10 A14 A26 A31 A32 A38 A39 A42 A44 Accessory switch Auto Batt ign switch fuse 5 10a Battery Bcm fuse 14 10a Body control module (bcm) (behind right front kick panel) Brake ind Chime Class 2 serial data Computer data lines system Driver door ajar switch (in lower left "b" pillar) Driver information center (dic) Driver seat belt buckle Driver seat belt switch G106 (on right inner front wheelwell) G300 (under driver seat carpet, on floor board) G310 (mounted under left side of passenger seat) G320 (under rear of middle console carpet, on floor board) Headlamp switch Hot at all times Ignition switch Ignition voltage Inflatable restraint sensing & diagnostic module (sdm) (beneath lower console) Instrument panel cluster (ipc) J200 J205 J300 J310 J320 Key-in switch Left rear door ajar switch (in lower left "c" pillar) Left seat belt sw Left turn ind Lf door ajar Logic Low ref Lr door ajar Lr turn sig lamp ctrl Nca Off Park Park brake sw sig Park brake switch (left lower side of dash) Passenger door ajar switch (in lower right "b" pillar) Passenger seat belt buckle Passenger seat belt ind Passenger seat belt switch Pk lmp sw sig Red Rf door ajar Right rear door ajar switch (in lower right "c" pillar) Right seat belt sw Right turn ind Rr door ajar Rr turn sig lamp ctrl Seat belt ind Seat belt ind ctrl Tire pressure ind Underhood fuse block (above left front wheelwell)
WIPER/WASHER Front Wiper/Washer Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Front Wiper/Washer Wiring Diagram for Hummer H3 Alpha 2008: 29 A20 Body control module (behind right front kick panel) Frt/wpr fuse 6 25a G105 (on left inner front wheelwell, behind battery) G106 (on right inner front wheelwell) Hi/low wpr relay Hot at all times Int J143 J210 Mist Nca Off On/off wpr relay Park out Rap relay coil control Rap/accy relay 88 Red S/roof frt/wpr fuse 9 15a Turn signal/ multi-function switch Underhood fuse block (above left front wheelwell) Windshield washer fluid pump (mounted on fluid reservoir) Windshield washer pump control Windshield wiper motor (under center of front cowling) Windshield wiper motor park switch signal Windshield wiper switch signal 1 Windshield wiper switch signal 2 Windshield wiper/ washer switch Wiper diode Rear Wiper/Washer Wiring Diagram for Hummer H3 Alpha 2008 List of elements for Rear Wiper/Washer Wiring Diagram for Hummer H3 Alpha 2008: 28 (center of endgate) rear window wiper motor Accy voltage Body control module (behind right front kick panel) G106 (on right inner front wheelwell) G350 (behind left rear quarter trim, near wheelwell) Ground Hot at all times Ill Interior lights system J205 J292 (in body harness right kick panel area, approximately 3 cm (1.2 in) rearward of breakout to bcm) J900 Logic Low Off Rap relay coil control Rap/accy relay 88 Rear window washer fluid pump (in right rear engine compt area) Rear window wiper/ washer switch Rear wpr switch/pump fuse 16 15a Rear/wpr mtr fuse 15 15a Underhood fuse block (above left front wheelwell) Wash Washer switch signal Wiper control motor Wiper delay 1 signal Wiper delay 2 signal Wiper motor
