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.
2007 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Fuse Block Views
Power and Grounding Component Views
Fuse Block - Underhood Connectors
1 - C125 Body Harness to Engine Harness (Transfer Case)
2 - Fuse Block - Underhood C4 (Engine Harness)
3 - Fuse Block - Underhood C3 (Engine Harness)
4 - C115 Forward Lamp Harness to Body Harness
5 - Fuse Block - Underhood C1 (Body Harness)
6 - Fuse Block - Underhood C2 (Body Harness)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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