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 H2 V8-6.0LFACTORY OEM SERVICE PROCEDURE
Ignition Switch: Service and Repair
Ignition and Start Switch Replacement
Tools Required
J42759 Ignition Switch Connector Release Tool
Removal Procedure
Caution: Refer to SIR Caution.
1. Disable the SIR system. Refer to SIR Disabling and Enabling.
2. Remove the steering wheel theft deterrent lock.
3. If equipped, remove the theft deterrent control module.
4. Rotate the key alarm connector (1) 90 degrees.
5. Gently pull the key alarm connector (2) out of the ignition lock cylinder case assembly (1).
6. Disconnect the connector from the ignition switch assembly.
7. Remove the wires encased in the ignition switch clip, which is located on the side of the ignition switch.
8. Remove the ignition switch assembly (2) using J42759.
Installation Procedure
1. Insert into the ignition lock cylinder case assembly (1).
2. Connect the connector to the ignition switch assembly (2).
Caution: Refer to SIR Inflator Module Coil Caution.
3. Push the key alarm connector (1) into the ignition lock cylinder case assembly (2).
4. Rotate the key alarm connector (1) 90 degrees so that the key alarm connector (1) locks into place.
5. Install the wires back into the ignition switch clip.
6. Install the steering wheel theft deterrent lock.
7. If equipped, install the theft deterrent control module.
8. Enable the SIR system. Refer to SIR Disabling and Enabling.
Factory Service Tools
Use the Manual With the Right Hardware
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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.