1. Gather Tools and Parts:
- Replacement ignition switch (verify compatibility with your specific vehicle model).
- Socket wrench set (metric sizes).
- Small flat-head screwdriver or a trim removal tool.
- New key (optional, if changing keys as well).
2. Disconnect the Battery:
- Locate the negative (-) battery terminal.
- Use the appropriate wrench to loosen and remove the nut securing the negative battery cable.
- Disconnect the negative battery cable and set it aside. This will help prevent any electrical accidents while you work.
3. Remove Steering Column Cover:
- Turn the steering wheel to the "lock" position.
- Use the trim removal tool or flat-head screwdriver to pry open the cover around the ignition switch.
4. Disconnect Ignition Switch Wiring:
- Once the steering column cover is removed, you'll see the ignition switch assembly.
- Identify the electrical connectors attached to the ignition switch.
- Carefully disconnect these connectors by pressing the release tabs or squeezing the connectors' clips.
5. Remove Ignition Lock Cylinder:
- Insert your key into the ignition switch and turn it to the "ON" position.
- Use the small flat-head screwdriver to depress the release button or pinhole located near the ignition lock cylinder.
- While pressing the release button, turn the key to the "ACC" position and remove it.
- The ignition lock cylinder should now come out of the switch.
6. Remove the Ignition Switch:
- After the ignition lock cylinder is removed, you can proceed to remove the ignition switch itself.
- Locate the bolts or screws securing the ignition switch to the steering column.
- Use the appropriate socket wrench to loosen and remove these fasteners.
- Gently pull the ignition switch out from the steering column.
7. Install New Ignition Switch:
- Take the new ignition switch and carefully align it with the mounting holes on the steering column.
- Secure the new switch using the bolts or screws you removed earlier. Tighten them snugly.
8. Reconnect Wiring:
- Reconnect the electrical connectors that you disconnected earlier. Make sure they click securely into place.
9. Reinstall Ignition Lock Cylinder:
- Insert the ignition lock cylinder back into the switch, ensuring it's aligned properly.
- Turn the key to the "ON" position and then back to the "OFF" position.
- If the cylinder moves smoothly and engages properly, the installation is successful.
10. Reinstall Steering Column Cover:
- Replace the steering column cover and snap it into place.
11. Reconnect Battery:
- Reconnect the negative battery cable to the battery terminal and secure it with the nut you removed earlier.
12. Test the Ignition Switch:
- Insert the key and turn the ignition to make sure it starts the vehicle properly.
13. Optional - Change the Key:
- If you have a new key, insert it into the ignition switch and turn it to the "ON" position.
- This action should disengage the old key and allow you to remove it.
- Now you can use the new key to start your vehicle.
Note:
While these instructions provide a general overview, the exact procedure may vary slightly based on the specific year, model, and trim level of your GMC Sierra. If you're unsure about any step or uncomfortable performing this repair, it's always best to consult with a qualified mechanic.
