1. Prepare your tools: You'll likely need a Phillips head screwdriver (possibly a small one).
2. Access the taillight assembly: This is the crucial step that varies most by vehicle. On many cars, you'll need to access the taillight from the trunk.
* Open the trunk: Locate the access panel(s) inside the trunk liner. This often involves removing panels that are held in place by clips or screws. The 1999 DeVille may have panels covering the taillight access. Carefully pry these away using plastic trim removal tools (avoid metal to prevent scratching) if necessary.
* Look for screws or clips: Once you've accessed the area behind the taillight, you should see screws or clips securing the taillight assembly to the car's body.
3. Remove the taillight assembly: Carefully unscrew or unclip the taillight assembly. It may be held in place by several fasteners. Work slowly and gently to avoid breaking any clips.
4. Disconnect the electrical connector: Once the assembly is loose, carefully disconnect the electrical connector from the back of the taillight. Usually there's a small latch or release tab.
5. Replace the bulb: Carefully remove the old bulb by gently twisting it (often it's a quarter-turn). Make sure you match the new bulb to the old one's specifications. Never touch the glass of the new bulb with your fingers. Use a clean cloth or paper towel if needed.
6. Reassemble: Insert the new bulb, reconnect the electrical connector, and carefully refasten the taillight assembly to the car.
7. Test the light: Before closing up everything, check that the new taillight works.
Important Considerations:
* Type of bulb: Be sure to get the correct replacement bulb. Check your owner's manual or the old bulb itself for the type and wattage. Auto parts stores can help you find the correct bulb.
* Safety: Work in a well-lit area. If working at night, use a work light.
* Patience: Take your time and be gentle to avoid damaging any parts.
* Professional help: If you're uncomfortable performing this task yourself, it's best to take your car to a qualified mechanic.
Remember that the exact procedure might slightly differ based on the specific model and trim level of your 1999 Cadillac DeVille. Your owner's manual is your best resource. If you don't have it, you can likely find a downloadable version online from Cadillac's website or through a parts store.
