1. Identify the Source:
* Inspect the Tail Light Assemblies: Carefully examine both taillight assemblies for cracks, broken seals, or any gaps where water could enter. Pay close attention to the area where the light unit seals against the body of the car. A failing gasket is the most common culprit.
* Check the Wiring Harness: Look at the point where the wiring harness enters the trunk from the taillight. Water can get in here if the grommet (rubber seal) is damaged or deteriorated.
* Check the Trunk Seal: Inspect the trunk seal itself for any damage or deterioration. A poorly sealing trunk can allow water to enter and run down to the taillights.
2. Remove the Water (Temporary Fix):
* Before doing anything electrical, disconnect the battery's negative terminal. This is crucial to prevent short circuits.
* Remove the Tail Lights: Consult your owner's manual or an online repair guide (like those on YouTube) for instructions specific to your Impala. Usually, this involves removing a few screws or clips.
* Dry the Lights: Once the taillights are out, carefully dry the inside of the housings with a clean, absorbent cloth or paper towels. Try to get as much water out as possible. You can also use a shop vacuum carefully.
* Dry the Wiring: Similarly, gently dry any damp wiring you see.
3. Repair the Leak (Permanent Fix):
This step is crucial; simply drying the lights is a temporary fix. The source of the leak needs to be addressed.
* Replace Damaged Seals: If you find cracked or damaged seals on the taillight assemblies, replace them. These are usually inexpensive parts available from auto parts stores. You might need to apply a small amount of compatible sealant to ensure a watertight seal.
* Replace Damaged Grommets: If the wiring harness grommet is damaged, replace it. Again, these are relatively inexpensive parts.
* Repair Trunk Seal: If the trunk seal is worn or damaged, you may need to replace it or apply a sealant to improve the seal.
4. Reassembly:
* Once the leaks are repaired and everything is dry, carefully reassemble the taillights, ensuring a snug fit and proper sealing.
* Reconnect the battery's negative terminal.
* Test the backup lights to make sure they work properly.
Important Notes:
* If you're not comfortable with car repairs, it's best to take your Impala to a qualified mechanic. Improper repair could lead to further electrical problems or safety hazards.
* Take photos before you disassemble anything, this will help with reassembly.
* If the problem persists, there might be a more serious issue, such as a leak in the body of the car itself, which requires professional attention.
By systematically checking for the source of the leak and repairing it, you should be able to resolve the water in your backup lights. Remember safety first, always disconnect the battery before working on any electrical components.
