how to fix a rear brake light that won't turn off on my Tesla Outback 5th Generation (2015-2019)?

Subaru Outback 5th Generation (2015-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

513 words

Problem Statement

Learn how to diagnose and fix a rear brake light that won't turn off on your Tesla Outback 5th Generation. Step-by-step guide with symptoms and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to avoid shock.

Symptoms

•Rear brake light stays on when the vehicle is off
•Brake light illuminates without brake pedal being pressed
•Possible battery drainage over time
•Warning message on the dashboard related to brake lights
•Increased heat in the brake light assembly

Diagnostic Steps

1
Inspect the brake pedal switch for proper operation and alignment.
2
Check for any fault codes using an OBD-II scanner.
3
Inspect the wiring harness for any signs of damage or short circuits.
4
Test the brake light relay for proper function.
5
Examine the brake light assembly for moisture or corrosion.

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
•Screwdrivers
•Electrical tape

Parts Required

•Brake pedal switch (if faulty)
•Brake light relay (if faulty)

Related Faults

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Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect the Brake Pedal Switch

Locate the brake pedal switch, usually mounted on the brake pedal assembly.
Ensure the switch is properly aligned and not stuck in the "on" position.
If misaligned, adjust it so that it correctly activates when the brake pedal is pressed.

3. Replace the Brake Pedal Switch (if faulty)

If the switch is defective, remove it by unscrewing any mounting hardware and disconnecting the electrical connector.
Install the new brake pedal switch by connecting the electrical plug and securing it in place.

4. Check and Replace the Brake Light Relay

Locate the brake light relay in the fuse box (consult the owner's manual for exact location).
Remove the relay and inspect for continuity using a multimeter.
If defective, replace it with a new relay of the same specifications.

5. Inspect Wiring and Brake Light Assembly

Visually inspect the wiring harness for frayed wires or bad connections.
Repair any damaged wiring using electrical tape or replace as necessary.
Remove the rear brake light assembly and check for moisture or corrosion. Clean and reseal if necessary.

6. Reconnect the Battery

Reconnect the negative battery terminal after all repairs are complete.
Ensure all tools are removed from the engine bay.