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.
2009 Hummer H2 4D Utility PickupFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Air Suspension Control Module (11) | Center rear of vehicle. See Figure. |
| Blower Motor Control Module-Auxiliary (3) | Rear of auxiliary HVAC module. See Figure. |
| Blower Motor Control Module (7) | Right side of dash. See Figure. |
| Body Control Module (BCM) (8) | Lower left of dash. See Figure. |
| Electronic Brake Control Module (ECBM) (2) | Behind fuse block underhood. See Figure. |
| Engine Control Module (ECM) (5) | Left side of engine compartment. See Figure. |
| Fuel Pump Flow Control Module | Right rear frame rail. See Figure. |
| Heated Seat Control Module-Rear (3) | Under left rear second row seat. See Figure. |
| Inflatable Restraint Sensing & Diagnostic Module (SDM) (7) | Left front seat. See Figure. |
| Memory Seat Module | Driver seat. See Figure. |
| Powertrain Control Module (PCM) | Left front of engine compartment. See Figure. |
| Rear Seat Audio (RSA) Controller | Rear of center console. See Figure. |
| Rear Window Wiper/Washer Module | Center of liftgate. See Figure. |
| Sunroof Module (10) | Front overhead console. See Figure. |
| Theft Deterrent Module (TDM) (5) | Ignition key cylinder. See Figure. |
| Transfer Case Shift Control Module | Headlight switch. See Figure. |
| Transmission Control Module (TCM) | Automatic transmission. |
| Vehicle Communication Interface Module (4) | Center of dash. See Figure. |
| Windshield Wiper/Washer Module | Windshield cowl. 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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