Tools You'll Need:
* Phillips head screwdriver (possibly a trim tool, depending on your model)
* New brake light bulbs (Check your owner's manual or a parts store to ensure you get the correct wattage and type. Common types are 3157 or 1157. Always replace both bulbs on the same side at once for consistent brightness.)
* Gloves (optional, but recommended to avoid greasy fingerprints)
Procedure:
1. Prepare the Vehicle: Park the vehicle on a level surface, engage the parking brake, and turn off the engine.
2. Access the Taillight Assembly: This is the crucial step that varies slightly depending on the year and trim level. You will generally need to:
* Open the Trunk: Access the trunk of the Seville.
* Remove Interior Trunk Trim: There are typically panels or trim pieces covering access to the taillights. These are usually held on by plastic clips or screws. Carefully pry them away using your fingers or a trim tool to avoid breaking them. Be gentle! Take your time to feel for clips before using any tools.
* Locate the Taillight Assembly: Once the interior trim is removed, you should see the taillight assembly. There are usually screws or clips holding it in place.
3. Remove the Taillight Assembly: Carefully remove the screws or clips holding the taillight assembly in place. Gently pull the assembly outwards to disconnect it from the vehicle body. Be careful not to pull any wires excessively.
4. Replace the Brake Light Bulb(s):
* Locate the Brake Light Bulb(s): The brake lights are typically the larger bulbs in the taillight assembly. Consult your owner's manual or a parts store to make sure you are replacing the correct bulb(s).
* Disconnect the Bulb(s): Gently twist and pull the bulb socket to disconnect it from the taillight assembly.
* Replace the Bulb(s): Carefully insert the new bulb into the socket, ensuring it's seated correctly.
* Reconnect the Bulb(s): Gently push the bulb socket back into place.
5. Reassemble: Carefully reinstall the taillight assembly, making sure all the screws or clips are securely fastened. Replace the interior trunk trim panels.
6. Test the Lights: Turn on your brake lights and verify that the new bulbs are working correctly.
Important Considerations:
* Owner's Manual: Always refer to your vehicle's owner's manual for specific instructions and diagrams. This is the best resource for your exact model.
* Take Pictures: Before disassembling anything, take pictures to help you remember how everything goes back together.
* Gentle Force: Use gentle force when removing and installing parts to avoid damage. If something feels stuck, stop and investigate before applying more pressure.
* Safety First: Work in a well-lit area. If you're uncomfortable performing this repair yourself, take your car to a qualified mechanic.
If you encounter difficulty finding the access panel or removing the taillight assembly, a quick YouTube search for "1999 Cadillac Seville STS taillight replacement" might yield helpful videos. Remember to specify your trim level (STS) if possible, as this can affect the exact procedure.
