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Home/Cars/Toyota/Highlander/XU70 (2020-Present)/how to fix a rear brake light issue on my Toyota Highlander XU70 (2020-Present)

how to fix a rear brake light issue on my Toyota Highlander XU70 (2020-Present)

Toyota Highlander XU70 (2020-Present)

Severity: mediumDifficulty: medium1-2 hours
3 min read
563 words

Problem Statement

Learn how to diagnose and fix rear brake light issues in Toyota Highlander XU70 (2020-Present). Step-by-step guide with diagnostic procedures and repair instructions.

Component
Electrical
Repair Time
1-2 hours

Safety Warnings

  • ⚠Disconnect the negative battery terminal before working on electrical systems to avoid shorts.

Symptoms

  • •Rear brake light not illuminating when the brake pedal is pressed
  • •Brake light stays on even when the vehicle is turned off
  • •Check brake lights warning message on the dashboard
  • •Flickering or dim brake light
  • •Unusual behavior of other electrical components (e.g., tail lights)

Diagnostic Steps

  1. 1Inspect the rear brake light bulbs for any signs of damage or burnout.
  2. 2Check the brake light fuse in the fuse box for continuity.
  3. 3Use a multimeter to test for voltage at the brake light socket when the brake pedal is pressed.
  4. 4Inspect the brake light switch located near the brake pedal for proper operation.
  5. 5Verify wiring continuity from the brake light switch to the brake light assembly.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Ensure the vehicle is in park and the engine is off.
  • Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Bulbs

  • Remove the rear light assembly cover by unscrewing the retaining screws.
  • Carefully pull the light assembly away from the vehicle.
  • Remove the brake light bulb: Twist counter-clockwise to release it from the socket.
  • Inspect the bulb for any signs of damage (filament breakage); replace if necessary with the correct bulb type (typically a 7443 bulb).
  • Reinsert the new bulb, twisting it clockwise to secure it.
  • Reassemble the rear light assembly and test the brake light function.

3. Check and Replace the Brake Light Fuse

  • Locate the fuse box (usually under the dashboard or in the engine compartment).
  • Refer to the fuse panel diagram to identify the brake light fuse.
  • Remove the fuse using a fuse puller or pliers.
  • Inspect the fuse for continuity; replace with the same amperage rating if blown.
  • Reinstall the fuse and check brake light operation.

4. Inspect and Replace Brake Light Switch

  • Locate the brake light switch near the top of the brake pedal.
  • Disconnect the wiring harness from the brake light switch.
  • Remove the mounting nut using a socket wrench.
  • Install the new brake light switch in reverse order, ensuring it is adjusted properly.
  • Reconnect the wiring harness and check brake light operation.

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

  • Screwdriver set
  • Socket set
  • Multimeter
  • Fuse puller or pliers

Parts Required

  • 7443 brake light bulb
  • Brake light switch (if needed)
  • Appropriate fuse (if needed)

Additional Information

Component

Electrical

Repair Time

1-2 hours

Difficulty

medium

Severity

medium

Tools

4 items

Parts

3 items

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