1. Preparation: Disconnect the negative terminal from your vehicle's battery. This is a crucial safety step to prevent accidental short circuits.
2. Locate the Light Housings: The license plate lights are located on either side of the license plate, within the rear bumper.
3. Remove the Housings: This is where the method varies slightly. Most likely, you'll need to:
* Check for screws: Look carefully around the edges of each light housing for small screws. These might be visible or hidden behind small access panels (sometimes just a rubber grommet).
* Examine for clips: If no screws are apparent, the housings are probably held in place by plastic clips. Gently pry the housing outward from the bumper using a flat, non-marring tool like a plastic trim removal tool or a dull putty knife. Work your way around the perimeter, releasing the clips carefully. Be gentle to avoid breaking the clips.
* Some models might require partial bumper removal: In some rare instances, particularly if the bumper is heavily modified or damaged, access might require partially removing the bumper cover itself. This is a more involved process that typically requires additional tools.
4. Disconnect the Bulbs: Once the housing is loose, carefully disconnect the electrical connector that powers the bulb(s). It's usually a simple push and twist mechanism.
5. Replace the Bulbs: Replace the old bulb(s) with the correct type and wattage. Double-check the orientation of the new bulbs before fully seating them.
6. Reassemble: Reconnect the electrical connectors, carefully snap the light housings back into place, and reattach any screws.
7. Reconnect the Battery: Reconnect the negative battery terminal.
8. Test: Turn on your lights to verify the new bulbs are working correctly.
Important Considerations:
* Consult a Repair Manual: A repair manual specific to your 1998 GMC Jimmy will provide the most accurate and detailed instructions, including diagrams. These manuals are often available online or at auto parts stores.
* Take Pictures: Before starting, take pictures of the process. This will help you remember how everything goes back together.
* Be Gentle: Plastic parts can easily break, so use caution when prying or using tools.
* Bulb Type: Check your owner's manual to be sure you are using the correct type and wattage of replacement bulbs.
If you're uncomfortable performing this repair yourself, it's always best to consult a qualified mechanic.
