Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Hummer H2 4D Utility PickupFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Air Suspension Module | Near right front of compressor. See Figure . |
| Blower Motor Control Processor | Behind right side of dash, on HVAC assembly. See Figure . |
| Body Control Module (BCM) | On top left side of dash, above I/P fuse block. See Figure . |
| Driver Door Module (DDM) | In driver's door, part of switch assembly. See Figure . |
| Electronic Brake Control Module (ECBM) | On left side of inner frame. See Figure . |
| FLASHER MODULE | On back side of I/P fuse block. See Figure . |
| Heated Seat Control Module-LR | Under left side of 2nd row seat. See Figure . |
| Heated Seat Control Module-RR | Under right side of 2nd row seat. See Figure . |
| HVAC Control Module | Behind center of dash. See Figure . |
| HVAC Module | On HVAC assembly. See Figure . |
| Inflatable Restraint I/P Module | Behind right side of dash. See Figure . |
| Inflatable Restraint I/P Module Connector | Behind right side of dash. See Figure . |
| Inflatable Restraint Sensing & Diagnostic Module (SDM) | Under left front seat. See Figure . |
| Inflatable Restraint Sensing & Diagnostic Module (SDM) Connector | Under left front seat. See Figure . |
| Inflatable Restraint Steering Wheel Module | Under horn pad. See Figure . |
| Memory Seat Module (Driver) | Under driver seat. See Figure . |
| Passenger Door Module (PDM) | In passenger door. See Figure . |
| Powertrain Control Module (PCM) | On left front of engine compartment. See Figure . |
| Rear Window Wiper Module - W/Motor | At center of liftgate. See Figure . |
| RSA Controller | At rear of center console. See Figure . |
| Sunroof Module | In front of headliner, near front overhead console. See Figure . |
| Theft Deterrent Control Module | In steering column. |
| Throttle Actuator Control (TAC) Module | At left rear of engine compartment. See Figure . |
| Transfer Case Shift Control Module | Behind headlamp switch. See Figure . |
| Vehicle Communication Interface Module | At center of dash, below HVAC control module. See Figure . |
| Windshield Wiper/Washer Module | Under windshield cowl, between wiper arms. See Figure . |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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