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.
2003 Hummer H2FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Blower Motor Control Processor | Behind right side of dash, on HVAC assembly. See Figure . |
| Body Control Module | On top left side of dash, above I/P fuse block. |
| Driver Door Module | In driver's door, part of switch assembly. |
| Electronic Brake Control Module | On left side of inner frame. |
| Flasher Module | On back side of I/P fuse block. |
| Front Passenger Door Module | Behind front passenger's door trim panel, below switch assembly. |
| Heated Seat Control Module (Left) | Under left rear seat. |
| Heated Seat Control Module (Right) | Under right rear seat. |
| HVAC Control Module | Behind center of dash. See Figure . |
| Ignition Coil/Module | On top of each spark plug. |
| Inflatable Restraint I/P Module | Behind right side of dash. |
| Inflatable Restraint Sensing/Diagnostic Module | Under left front seat. |
| Powertrain Control Module | On left front of engine compartment. |
| Rear Seat Audio Controller | At rear of center console. |
| Sun Roof Module | In front of headliner, near front overhead console. |
| Throttle Actuator Control Module | At left rear of engine compartment. |
| Transfer Case Shift Control Module | Behind headlamp switch. |
| Vehicle Communication Interface Module | At center of dash, below HVAC control module. |
| Windshield Wiper/Washer Module | Under windshield cowl, between wiper arms. |
Factory Service Tools
Use the Manual With the Right Hardware
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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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