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How can I resolve issues with the fog lights not working on my Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How can I resolve issues with the fog lights not working on my Highlander?

How can I resolve issues with the fog lights not working on my Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
649 words

Problem Statement

Learn how to troubleshoot and fix fog light issues on your Toyota Highlander with detailed diagnostic steps and required tools.

Affected Component
fog lights

Symptoms

  • •Fog lights do not illuminate when switched on.
  • •Indicator light for fog lights on the dashboard does not light up when activated.
  • •Other lights (headlights, turn signals) are functioning properly.

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

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
  • •Fuse puller or pliers
  • •Screwdrivers (Phillips and flat)
  • •Wrench or socket set
  • •Replacement bulbs (if necessary)
  • •Replacement fuse (if necessary)

Additional Information

Affected Component
fog lights
Difficulty
medium
Severity
medium
Tools Required
6 items

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Back to Generation
Troubleshooting Fog Lights on Toyota Highlander (2020-present)
Tools Required:
  • Multimeter
  • Fuse puller or pliers
  • Screwdrivers (Phillips and flat)
  • Wrench or socket set
  • Replacement bulbs (if necessary)
  • Replacement fuse (if necessary)
Repair Instructions:

Step 1: Check the Fog Light Switch

  1. Turn the ignition on without starting the engine.
  2. Activate the fog light switch and observe if the indicator light on the dashboard illuminates.
  3. If the switch feels faulty, consider replacing it.

Step 2: Inspect Fog Light Bulbs

  1. Open the hood and locate the fog light assembly.
  2. Remove the fog light cover (if applicable) by unscrewing or unclipping it.
  3. Disconnect the fog light connector from the bulb.
  4. Inspect the bulb for any signs of breakage. If the filament is broken, replace the bulb:
    • Twist the bulb socket counterclockwise to remove it.
    • Replace with a new bulb of the same type (usually H11 for Highlander).
    • Reconnect the fog light connector.

Step 3: Examine the Fuses

  1. Locate the fuse box for the fog lights (refer to the owner’s manual for the exact location).
  2. Remove the cover of the fuse box.
  3. Identify the fog light fuse (check the diagram on the fuse box cover).
  4. Use a fuse puller or pliers to remove the fuse and inspect it:
    • If the metal strip inside is broken, replace it with a new fuse of the same amperage.
  5. Reinstall the fuse box cover.

Step 4: Test the Wiring

  1. Using a multimeter, set it to measure DC voltage.
  2. Turn on the fog lights and probe the fog light connector:
    • Check for voltage (should be close to battery voltage, ~12V).
    • If no voltage is present, check the wiring for breaks or corrosion and repair as needed.

Step 5: Check the Relay

  1. Locate the fog light relay in the fuse box.
  2. Remove the relay and test it:
    • Use a multimeter to check for continuity by inserting the probes into the relay terminals.
    • If the relay is faulty, replace it with a new one.
  3. Reinstall the relay.
Final Steps:
  • After making any repairs, reassemble any components you removed.
  • Test the fog lights to ensure they are functioning properly.
  • If the fog lights still do not work after these steps, further diagnostics may be required, potentially involving the vehicle's body control module (BCM) or a wiring harness issue.
Conclusion:

Following these detailed steps should help you identify and resolve the issue with the fog lights on your Toyota Highlander. If the problem persists, it may be advisable to consult a professional technician or visit a Toyota dealership for advanced diagnostics.