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
Electrical Component Locator: Switches
SWITCHES LOCATION
| Component | Location |
|---|---|
| A/C Low Pressure Switch | On right side of accumulator. See Figure . |
| A/C Refrigerant Pressure Switch | At right front of engine. See Figure . |
| Air Suspension Inflator Switch | Near right "D" pillar. See Figure . |
| Air Suspension Inflator Switch Connector | At right rear frame body mount. See Figure . |
| Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch | In automatic transmission. See Figure . |
| Brake Fluid Level Switch Connector | On left side of brake fluid reservoir. See Figure . |
| Coolant Level Switch | In coolant reservoir. See Figure . |
| Door Lock Switch - Rear | Near right "D" pillar. See Figure . |
| Engine Oil Level Switch | On lower right side of oil pan. See Figure . |
| Ignition Key Alarm Switch | On ignition key cylinder. See Figure . |
| Ignition Switch | On steering column. See Figure . |
| Inflatable Restraint I/P Module Disable Switch | Behind right side of dash. See Figure . |
| Liftgate Ajar Switch-Left | At lower left side of liftgate. See Figure . |
| Liftgate Ajar Switch-Right | At lower right side of liftgate. See Figure . |
| Park Brake Switch Connector | Part of parking brake assembly. See Figure . |
| PNP Switch | On left side of transmission. See Figure . |
| Seat Belt Switch Connector | At right side of driver seat. See Figure . |
| Stop Lamp Switch | On top of brake pedal bracket. 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.