why do my brake lights stay on in my Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

527 words

Problem Statement

Learn how to diagnose and fix brake lights that stay on in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shorts or shocks

Symptoms

•Brake lights continuously illuminated
•Brake light warning on the dashboard (if applicable)
•Potential battery drain if left unattended
•Unresponsive brake pedal switch
•Unusual behavior from cruise control (if equipped)

Diagnostic Steps

1
Inspect brake pedal switch for position and functionality
2
Check wiring connections to the brake light switch for damage or corrosion
3
Test brake light switch continuity with a multimeter
4
Inspect the brake light relay in the fuse box for malfunction
5
Scan for error codes using an OBD-II scanner

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

•OBD-II scanner
•Multimeter
•Socket set
•Screwdriver

Parts Required

•Brake light switch (if replacement is necessary)

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Solution

1. Preparation

Gather Tools: OBD-II scanner, multimeter, socket set, and screwdriver.
Safety Precautions: Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Adjust Brake Pedal Switch

Locate the brake pedal switch above the brake pedal.
Check for proper alignment; if misaligned, adjust it so it makes contact when the pedal is fully released.
If the switch is stuck, manually pull it back to see if it resolves the issue.

3. Test Brake Light Switch

Reconnect the battery and use a multimeter to test the brake light switch.
Ensure the switch shows continuity when the brake pedal is pressed and no continuity when released.
If it fails the test, proceed to replace the switch.

4. Replace Brake Light Switch (if necessary)

Remove the Old Switch:
- Disconnect the electrical connector from the brake light switch.
- Remove the switch from its mount (usually a simple twist or pull).
Install the New Switch:
- Position the new switch in the same orientation as the old one.
- Reconnect the electrical connector.
- Test the switch by pressing and releasing the brake pedal to ensure proper operation.

5. Verify Wiring and Relay

If symptoms persist after switch replacement, check the wiring harness for damage.
Replace the brake light relay if it is found to be faulty or sticking.