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 Module References
WARNING: This page is about a different car, the 2004 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
Control Module References
| Control Module | Repair/Reprogramming Instruction | Diagnostic System Check | Schematic |
|---|---|---|---|
| Audio Amplifier | Refer to Amplifier Replacement in Entertainment | Refer to Diagnostic System Check - Entertainment System in Entertainment | Refer to Radio/Audio System Schematics (non Class 2 Amplifier) or Radio/Audio System Schematics (Class 2 Amplifier) in Entertainment |
| Body Control Module | - | Refer to Body Control System Schematics | |
| Driver Door Module | Refer to Switch Replacement - Door Lock and Side Window - Driver in Doors | Refer to Diagnostic System Check - Door Systems in Doors | Refer to Door Lock/Indicator Schematics in Doors |
| Driver Seat Module | Refer to Memory Seat Control Module Replacement in Seats | Refer to Diagnostic System Check - Power Seat Systems in Seats | Refer to Driver Seat Schematics in Seats |
| Electronic Brake Control Module | Refer to Electronic Brake Control Module Replacement in Anti-lock Brake System | Refer to Diagnostic System Check - ABS in Anti-lock Brake System | Refer to ABS Schematics in Anti-lock Brake System |
| Electronic Suspension Control Module | Refer to Module Assembly Electronic Suspension Control Replacement in Air Suspension | Refer to Diagnostic System Check - Air Suspension in Air Suspension | Refer to Suspension Controls Schematics in Air Suspension |
| Front Passenger Door Module | Refer to Switch Replacement - Door Lock and Side Window - Passenger in Doors | Refer to Diagnostic System Check - Door Systems in Doors | Refer to Door Lock/Indicator Schematics in Doors |
| HVAC Control Module | Refer to HVAC Control Module Replacement in HVAC Systems - Automatic | Refer to Diagnostic System Check - HVAC Systems - Automatic in HVAC Systems - Automatic | Refer to HVAC Schematics in HVAC Systems - Automatic |
| Inflatable Restraint Sensing and Diagnostic Module | Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement in SIR | Refer to Diagnostic System Check - SIR in SIR | Refer to SIR Schematics in SIR |
| Instrument Panel Cluster | Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gauges and Console | Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console | Refer to Instrument Cluster Schematics in Instrument Panel, Gauges and Console |
| Powertrain Control Module |
|
Refer to Diagnostic System Check - Engine Controls in Engine Controls - 4.8L, 5.3L, and 6.0L | Refer to Engine Controls Schematics in Engine Controls - 4.8L, 5.3L, and 6.0L |
| Radio | Refer to Radio Replacement in Entertainment | Refer to Diagnostic System Check - Entertainment System in Entertainment | Refer to Radio/Audio System Schematics (non Class 2 Amplifier) or Radio/Audio System Schematics (Class 2 Amplifier) in Entertainment |
| Rear Seat Audio Control | Refer to Audio Control Replacement - Rear Seat in Entertainment | Refer to Diagnostic System Check - Entertainment System in Entertainment | Refer to Radio/Audio System Schematics (non Class 2 Amplifier) or Radio/Audio System Schematics (Class 2 Amplifier) in Entertainment |
| Transfer Case Shift Control Module |
|
Refer to Diagnostic System Check - Transfer Case in Transfer Case - BW 4484 | Refer to Transfer Case Control Schematics in Transfer Case - BW 4484 |
| Vehicle Communication Interface Module | Refer to Communication Interface Module Replacement in Cellular Communications | Refer to Diagnostic System Check - Cellular Communication in Cellular Communication | Refer to OnStar Schematics in Cellular Communications |
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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