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
Door Module DTCS
DOOR MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| Diagnostic Procedure | Description |
|---|---|
| DTC B1023 | Integral Switch Performance |
| DTC B1544, B1600, or B1605 | Mirror Motors Common Circuit |
| DTC B1580, B1590, B1610, or B1620 | Left Front Mirror Position Circuit |
| DTC B1640 or B1645 | Front Mirror Heater Circuit |
| DTC B1722 | Mirror Power Fold Control Circuit |
| DTC B3808 | Rear Door Lock Relay Circuit |
| DTC B3809 | Rear Door Unlock Relay Circuit |
| DTC B3819 | Left Rear Window Up Control Circuit |
| DTC B3820 | Left Rear Window Down Control Circuit |
| DTC B3821 | Left Rear Window Relay Power Circuit |
| DTC B3822 | Right Rear Window Up Control Circuit |
| DTC B3823 | Right Rear Window Down Control Circuit |
| DTC B3824 | Right Rear Window Relay Power Circuit |
| DTC B3825 | Liftgate Lock Signal Circuit |
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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