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How do I fix the fog lights not working in a 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I fix the fog lights not working in a 2020 Toyota Highlander?

How do I fix the fog lights not working in a 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
1-2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
642 words

Problem Statement

Learn how to diagnose and fix fog lights not working in a 2020 Toyota Highlander with step-by-step instructions.

Affected Component
fog lights
Estimated Time
1-2 hours

Symptoms

  • •Fog lights do not illuminate when activated.
  • •No unusual noises or flickering when the fog light switch is turned on.
  • •Possible warning light on the dashboard indicating a bulb issue.

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
  • •Flathead screwdriver
  • •Phillips screwdriver
  • •Fuse puller or needle-nose pliers
  • •Replacement bulbs (if needed)
  • •Replacement fuse (if needed)
  • •Relay (if needed)

Additional Information

Affected Component
fog lights
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
7 items

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Fixing Fog Lights Not Working in a 2020 Toyota Highlander

Step 1: Check the Fog Light Bulbs
  1. Visual Inspection: Begin by visually inspecting the fog light lenses for any signs of damage or moisture.
  2. Bulb Condition: If accessible, check the condition of the bulbs. Look for broken filaments or blackened glass.
Step 2: Inspect the Fog Light Switch
  1. Functionality Test: Turn the fog light switch on and off several times to see if there's a change in operation. Listen for a click to ensure the switch is engaging.
  2. Check with Multimeter: Use a multimeter to test the continuity of the switch. Disconnect the switch and probe the terminals with the multimeter set to continuity mode.
Step 3: Check the Fuse
  1. Locate the Fuse Box: Find the fuse box; on the 2020 Highlander, it is usually located under the dashboard on the driver's side or in the engine bay.
  2. Identify the Fog Light Fuse: Refer to the owner's manual to locate the specific fuse for the fog lights.
  3. Inspect the Fuse: Remove the fuse and visually check for a blown element. Test with a multimeter if unsure.
Step 4: Inspect the Wiring and Connectors
  1. Visual Inspection: Check for any visible damage to the wiring harness leading to the fog lights.
  2. Connector Condition: Make sure the connectors are clean and securely fastened. Look for corrosion or bent pins.
Step 5: Check the Relay
  1. Locate the Relay: Find the fog light relay in the fuse box; refer to the owner’s manual for its exact location.
  2. Test the Relay: Swap it with a similar relay from the fuse box to see if functionality changes (if available).
  3. Relay Testing: If necessary, use a multimeter to test the relay’s operation according to the manufacturer's specifications.
Tools Required
  • Multimeter
  • Flathead screwdriver
  • Phillips screwdriver
  • Fuse puller or needle-nose pliers
  • Replacement bulbs (if needed)
  • Replacement fuse (if needed)
  • Relay (if needed)
Repair Instructions
Replacing Fog Light Bulbs
  1. Access the Fog Lights: Depending on the design, you may need to access the fog light assembly from beneath the vehicle or by removing the front bumper.
  2. Remove the Bulb Socket: Turn the bulb socket counterclockwise to remove it from the assembly.
  3. Replace the Bulb: Pull the old bulb straight out and insert the new bulb, ensuring not to touch the glass with your hands (use gloves or a cloth).
  4. Reinstall the Bulb Socket: Insert the bulb socket back into the fog light assembly and turn it clockwise to secure.
Replacing the Fuse
  1. Identify the Blown Fuse: Remove the blown fuse and replace it with a new one of the same amperage.
  2. Secure the Fuse Box: Reinstall the fuse box cover if applicable.
Replacing the Relay
  1. Remove the Old Relay: Pull the faulty relay out of the fuse box.
  2. Install the New Relay: Insert the new relay into the same slot and ensure it is seated properly.
Final Check
  1. Test the Fog Lights: After completing the repairs, activate the fog lights to ensure they are functioning correctly.
  2. Recheck Connections: If they do not work, double-check all connections, fuses, and wiring.
Conclusion

If the fog lights still do not function after completing the above steps, it may be necessary to consult with a professional technician or visit a dealer for further diagnosis, as there could be an issue with the vehicle's Body Control Module (BCM) or other electrical components.