FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
How do I fix the problem of my 2020 Toyota Highlander's fog lights not working? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I fix the problem of my 2020 Toyota Highlander's fog lights not working?

How do I fix the problem of my 2020 Toyota Highlander's fog lights not working?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and fix fog light issues on your 2020 Toyota Highlander with step-by-step instructions.

Affected Component
fog lights
Estimated Time
1-2 hours

Symptoms

  • •Fog lights do not illuminate when the fog light switch is activated.
  • •Dashboard indicator for fog lights may or may not illuminate.
  • •No unusual noises or smells when the fog lights are switched on.

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
  • •Replacement bulbs (H11)
  • •Fuse puller or pliers
  • •Replacement fuse
  • •Wire strippers
  • •Electrical tape
  • •Replacement relay

Additional Information

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

Related Faults

Loading...

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation

Fixing Fog Lights on a 2020 Toyota Highlander

Step 1: Check the Fog Light Switch
  1. Tools Required: Multimeter
  2. Procedure:
    • Turn the ignition to the "ON" position (do not start the engine).
    • Locate the fog light switch on the stalk or dashboard.
    • Use the multimeter to check for voltage at the fog light switch. If there is no voltage, the problem may lie in the switch itself or earlier in the circuit.
Step 2: Inspect the Fog Light Bulbs
  1. Tools Required: Flathead screwdriver, replacement bulbs (if necessary)
  2. Procedure:
    • Access the fog light assembly by removing the screws or clips holding the fog light cover in place.
    • Remove the fog light bulb by twisting it counterclockwise and pulling it out.
    • Inspect the filament for any breaks or damage. If the filament is broken, replace the bulb with a new one (H11 bulbs for the Highlander).
    • Reassemble the fog light assembly and test again.
Step 3: Check the Fog Light Fuse
  1. Tools Required: Fuse puller or pliers, replacement fuse
  2. Procedure:
    • Locate the fuse box. For the 2020 Toyota Highlander, it is typically found under the dashboard on the driver's side or in the engine compartment.
    • Refer to the fuse diagram on the cover or in the owner's manual to locate the fog light fuse (usually labeled as "FOG" or "FR FOG").
    • Remove the fuse and inspect it. If the metal strip inside is broken, replace it with a new fuse of the same amperage (typically 15 amps).
    • Reinsert the fuse and test the fog lights.
Step 4: Inspect Wiring and Connectors
  1. Tools Required: Wire strippers, electrical tape, multimeter
  2. Procedure:
    • Inspect the wiring harness connected to the fog lights for any visible damage, such as fraying or corrosion.
    • Check that all connectors are firmly seated.
    • Use the multimeter to check for continuity in the wires leading from the fog light switch to the fog lights. If there is no continuity, you may need to repair or replace the damaged wiring.
Step 5: Test the Relay
  1. Tools Required: Multimeter, replacement relay (if necessary)
  2. Procedure:
    • Locate the fog light relay in the fuse box (refer to the owner's manual for specifics).
    • Remove the relay and check for continuity using the multimeter. If it fails, replace it with a new relay.
    • Reinstall the relay and test the fog lights again.
Repair Instructions
Replacing the Fog Light Bulb
  1. Remove the fog light cover using a flathead screwdriver.
  2. Twist the old bulb counterclockwise to remove it from the socket.
  3. Insert the new bulb into the socket and twist it clockwise to secure it.
  4. Replace the fog light cover.
Replacing the Fog Light Fuse
  1. Locate the fuse box based on your vehicle's manual.
  2. Use a fuse puller or pliers to remove the old fuse.
  3. Insert a new fuse of the same amperage into the slot.
Repairing Wiring
  1. If you find any damaged wiring, cut out the damaged section.
  2. Strip the ends of the wires to expose fresh copper.
  3. Use wire connectors to splice in new wire, ensuring a secure connection.
  4. Wrap the connections with electrical tape to protect them from moisture.
Conclusion

After performing all diagnostic steps and repairs, turn on the fog lights to ensure they are operational. If the fog lights still do not work after these steps, it may be necessary to consult a professional technician for further diagnosis, as the issue may lie in more complex electrical systems or modules within the vehicle.