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 H3 AlphaFACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Grounds
GROUNDS LOCATION
| Component | Location |
|---|---|
| G100 | In engine compartment, mounted to left front inner fender, behind battery. See Figure. |
| G102 | On lower left side of engine block, rearward of G103. See Figure. |
| G103 | On lower left side of engine block, forward of G102. See Figure. |
| G104 | Left side of engine block, in front of starter. See Figure. |
| G105 | On left inner front wheelwell, behind battery. See Figure. |
| G106 | On right inner front wheelwell. See Figure. |
| G110 | Left side of engine block, forward of G103. See Figure. |
| G120 | On left lower inner wheelwell, near engine mount. See Figure. |
| G300 | Under driver seat carpet, on floor board. See Figure. |
| G310 | Mounted under left side of passenger seat. See Figure. |
| G320 | Under rear of middle console carpet, on floor board. See Figure. |
| G340 (3) | Behind right rear quarter trim, near wheelwell. See Figure. |
| G345 (2) | Behind left rear quarter trim, near wheelwell. See Figure. |
| G350 (2) | Behind left rear quarter trim, near wheelwell. See Figure. |
| G420 | Mounted to left side of rear cross member, near X420. 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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