* Brake Light Switch: This is the most common cause. The brake light switch is a small switch located near the brake pedal. It's activated when you press the brake pedal, completing the circuit to illuminate the brake lights. It can wear out, become misaligned, or get stuck. This is the first thing to check. It's relatively inexpensive and easy to replace.
* Wiring: A break or short in the wiring between the brake light switch and the brake lights themselves is possible. This could be anywhere along the wiring harness running from the switch to the rear of the car. Inspect the wiring carefully for any damage, fraying, or corrosion, particularly near the brake pedal and at the connection points to the taillights.
* Brake Light Bulbs: While you mentioned the tail lights work, it's still worth checking the brake light bulbs themselves. They might be burned out, even if the tail light filaments are still functional. They are often dual-filament bulbs (one for tail lights, one for brake lights).
* Ground Connection: A poor ground connection at the taillights can prevent the brake lights from working correctly. A corroded or loose ground wire will interrupt the circuit. Check the ground wires at the taillights for corrosion and ensure a solid connection.
* Brake Light Relay (if applicable): Some vehicles have a relay for the brake lights. If your Camry uses one, this could be faulty. However, this is less common than the other problems.
* Body Control Module (BCM): In some later model cars, the BCM controls various electrical functions. A faulty BCM is less likely but possible, especially if other electrical issues are present. This is usually a more expensive and complex repair.
Troubleshooting Steps:
1. Inspect the Brake Light Switch: This is the easiest and most likely solution. Try carefully pressing down on the brake pedal and checking for continuity at the switch with a multimeter (if you have one). If it's not working, replace the switch.
2. Check the Brake Light Bulbs: Visually inspect the bulbs for any obvious damage. Replace them if necessary.
3. Check the Wiring: Carefully examine the wiring harness running to the taillights. Look for any signs of damage, corrosion, or loose connections.
4. Check the Ground Connections: Clean and tighten the ground connections at the taillights.
5. Use a Multimeter: If you're comfortable using a multimeter, you can test the voltage at the brake light bulbs and wiring to pinpoint the problem. A lack of voltage at the bulbs with the brake pedal pressed indicates a problem upstream (switch, wiring, etc.).
If you are not comfortable working on car electrical systems, it's best to take your Camry to a qualified mechanic. They will have the tools and expertise to diagnose and repair the problem safely and efficiently.
