why are my Toyota Highlander Third Generation (2014-2019) rear lights not working?

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

567 words

Problem Statement

Learn how to diagnose and fix rear light issues in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, 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 prevent shocks or shorts.

Symptoms

•Rear lights do not illuminate when headlights are activated
•Brake lights remain off when the brake pedal is pressed
•Turn signals do not flash or illuminate
•Reverse lights do not turn on when the vehicle is in reverse
•Possible warning indicators on the dashboard related to lighting issues

Diagnostic Steps

1
Check the fuse for the rear lights using the owner's manual to locate the correct fuse box and corresponding fuse.
2
Inspect the bulbs in the rear light assemblies for any burnt-out or damaged bulbs.
3
Use a multimeter to test the voltage at the rear light connectors when the lights are activated.
4
Examine the wiring harness for any signs of wear, corrosion, or loose connections.
5
Verify the function of the brake light switch located near the brake pedal.
6
Scan the vehicle’s onboard computer for any fault codes related to the lighting system.

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

•Fuse puller
•Screwdriver set
•Multimeter
•Replacement bulbs

Parts Required

•Fuses
•Replacement bulbs
•Brake light switch

Related Faults

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Diagnostic Steps

1
Check the fuse for the rear lights using the owner's manual to locate the correct fuse box and corresponding fuse.
2
Inspect the bulbs in the rear light assemblies for any burnt-out or damaged bulbs.
3
Use a multimeter to test the voltage at the rear light connectors when the lights are activated.
4
Examine the wiring harness for any signs of wear, corrosion, or loose connections.
5
Verify the function of the brake light switch located near the brake pedal.
6
Scan the vehicle’s onboard computer for any fault codes related to the lighting system.

Solution

1. Preparation

Gather tools: fuse puller, screwdriver set, multimeter, and replacement bulbs if needed.
Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Replace Fuses

Locate the fuse box as per the owner's manual.
Identify the fuse related to the rear lights and remove it using a fuse puller.
Inspect the fuse for continuity; if blown, replace it with a new fuse of the same amperage.
Reconnect the battery terminal.

3. Inspect and Replace Bulbs

Open the rear light assembly by removing screws or clips.
Carefully pull the light housing out to access the bulbs.
Remove the bulbs and inspect them for any signs of damage or burnt filaments.
Replace any faulty bulbs with new ones, ensuring they are the correct type (consult the owner’s manual for specifications).
Reassemble the light housing and test the lights.

4. Test Wiring and Connectors

Reconnect the battery and activate the lights.
Use a multimeter to check for voltage at the connectors; if no voltage is present, trace the wiring for any breaks or shorts.
Repair any damaged wiring or connectors as necessary.

5. Check Brake Light Switch

Locate the brake light switch under the dashboard.
Inspect the switch for any damage or misalignment.
Test the switch for functionality; if faulty, replace it with a new switch.