Tools You'll Likely Need:
* Repair manual: Absolutely crucial for specific instructions and torque specifications.
* Socket set: Various sizes, including metric.
* Screwdrivers: Phillips and flathead, possibly various sizes.
* Pliers: Needle-nose and regular.
* Wiring diagram: Essential for proper reconnection of wires. You may find this in your repair manual or online.
* Ratchet and extensions: For reaching fasteners in tight spaces.
* Possibly a security bit set: depending on the screws used.
* Electrical tape or wire connectors: For secure and properly insulated wire connections.
General Steps (This is NOT a substitute for a repair manual):
1. Disconnect the battery: This is the most crucial safety step to prevent electrical shocks and short circuits. Disconnect the negative (-) terminal first.
2. Remove the steering column shroud: This plastic cover typically requires removing screws and possibly some trim pieces. Your repair manual will show you exactly how.
3. Access the ignition switch: This is often located behind the steering wheel, requiring partial disassembly of the steering column. The access method varies depending on the exact model and trim level. The repair manual will be your guide here. Expect to find several screws and possibly some clips. Be careful not to damage any wiring harnesses.
4. Disconnect the wiring harness: This is where the wiring diagram becomes vital. Carefully photograph or document the location of each wire before disconnecting it. Label the wires if possible. Failure to reconnect the wires correctly can damage your vehicle's electrical system.
5. Remove the ignition switch: This usually involves removing screws or bolts holding the switch in place. It might be a single unit or multiple parts.
6. Install the new ignition switch: Carefully align the new switch and install it in the reverse order of removal. Ensure it's properly seated.
7. Reconnect the wiring harness: Use your photos or notes to reconnect all wires to the correct terminals. Double-check everything before proceeding.
8. Reassemble everything: Reinstall the steering column shroud and any other removed components.
9. Reconnect the battery: After everything is reassembled.
10. Test the ignition switch: Turn the key to ensure all functions (starting, accessories, etc.) work correctly.
Important Considerations:
* Anti-theft system: Some vehicles have an anti-theft system linked to the ignition switch. If you have this, you might need special tools or a locksmith to reprogram the system after replacement.
* Steering column lock: Be aware of how the steering column lock works. Disassembly and reassembly can be tricky and the repair manual will help greatly.
* Professional help: If you're uncomfortable working with car electronics or steering column components, consider taking your vehicle to a qualified mechanic. Improperly replacing the ignition switch can lead to serious damage.
This is a high-level overview. The exact procedure can vary significantly depending on your specific GMC Jimmy model. A repair manual is absolutely essential for this job. Do not attempt this repair without one. It will save you time, frustration, and potential damage to your vehicle.
