FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
What is causing the rear brake lights to stay on in my 2021 Toyota Camry? - Toyota Camry
Home/Cars/Toyota/Camry/Eighth Generation (2018-present)/What is causing the rear brake lights to stay on in my 2021 Toyota Camry?

What is causing the rear brake lights to stay on in my 2021 Toyota Camry?

Toyota Camry Eighth Generation (2018-present)

Error Codes
1-2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
649 words

Problem Statement

Learn how to diagnose and fix the issue of rear brake lights staying on in your 2021 Toyota Camry. Follow our step-by-step guide for effective troubleshooting.

Affected Component
Brake Light System
Estimated Time
1-2 hours

Symptoms

  • •Rear brake lights stay on continuously
  • •Battery drain

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •Multimeter
  • •Screwdriver set (Phillips and flathead)
  • •Socket set
  • •Pliers
  • •Wiring diagram (for reference)
  • •OBD-II Scanner (optional)

Additional Information

Affected Component
Brake Light System
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
6 items

Related Faults

Loading...

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation
Potential Causes
  1. Faulty Brake Light Switch: The brake light switch may be stuck or malfunctioning, causing the lights to stay illuminated.
  2. Stuck Brake Pedal: The brake pedal may be physically stuck in a depressed position, keeping the brake lights activated.
  3. Wiring Issues: There could be a short circuit or damaged wiring causing the brake lights to remain on.
  4. Body Control Module (BCM) Malfunction: The BCM controls various lighting functions, and a fault here could cause the brake lights to stay on.

Tools Required

  • Multimeter
  • Screwdriver set (Phillips and flathead)
  • Socket set
  • Pliers
  • Wiring diagram (for reference)
  • OBD-II Scanner (optional)

Step 1: Inspect Brake Light Switch

  1. Locate the Brake Light Switch:

    • The switch is typically located near the top of the brake pedal arm, where it makes contact when the pedal is released.

  2. Visual Inspection:

    • Check for any visible damage or misalignment of the switch.

  3. Test the Switch:

    • Disconnect the wiring harness from the brake light switch.
    • Use a multimeter to check continuity:
      • There should be continuity when the brake pedal is pressed and none when it is released. If the switch is always showing continuity, it’s faulty.

  4. Replace if Necessary:

    • If the switch is faulty, replace it with a new one. Ensure it is correctly aligned to allow the pedal to fully disengage.

Step 2: Check the Brake Pedal

  1. Physical Inspection:

    • Ensure that the brake pedal is not physically obstructed or stuck in the depressed position.

  2. Test Movement:

    • Press and release the brake pedal a few times. Ensure it returns to the fully released position smoothly without obstruction.

Step 3: Inspect Wiring and Connectors

  1. Visual Inspection:

    • Check the wiring harness leading to the brake light switch for any signs of wear, fraying, or damage.

  2. Check for Shorts:

    • Use a multimeter to check for continuity between the wires:
      • Unplug the switch and check if any of the wires are shorted to ground or to each other.

Step 4: Scan for Error Codes

  1. Connect OBD-II Scanner:
    • Check for any fault codes related to the BCM or brake system.
    • Look for any codes that might indicate a malfunctioning module or related component.
Repair Instructions

Replacing the Brake Light Switch

  1. Disconnect Battery:

    • Always disconnect the negative terminal of the battery before working on electrical components.

  2. Remove the Old Switch:

    • Use a screwdriver to remove any screws or clips holding the switch in place.
    • Disconnect the wiring harness from the switch.

  3. Install New Switch:

    • Connect the wiring harness to the new switch.
    • Secure the switch in place with screws or clips.

  4. Reconnect Battery:

    • Reconnect the negative battery terminal.

  5. Test Functionality:

    • Press the brake pedal to ensure the lights turn on and release to confirm they turn off.

Fixing Wiring Issues

  1. Repair Damaged Wiring:

    • If any damaged wires are found, use electrical tape or heat-shrink tubing to repair them.
    • Ensure all connections are secure and insulated.

  2. Re-test the System:

    • After repairs, reconnect the battery and test the brake lights again.
Conclusion

By following these diagnostic and repair steps, you should be able to resolve the issue of the rear brake lights staying on in your 2021 Toyota Camry. If the problem persists after checking the brake light switch and wiring, further investigation into the Body Control Module may be necessary, and consulting a professional technician could be advisable.