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

How can 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
690 words

Problem Statement

Learn how to diagnose and repair fog lights not working 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 switched on.
  • •Fog light indicator on the dashboard may or may not light up.
  • •No unusual noises or flickering from the fog lights when activated.

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
  • •Screwdrivers (Phillips and flathead)
  • •Pliers
  • •Replacement bulbs (if needed)
  • •Wiring diagram (for reference)
  • •Fuse puller or needle-nose pliers
  • •Vehicle owner's manual

Additional Information

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

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Problem Diagnosis: Fog Lights Not Working on 2020 Toyota Highlander
Tools Required
  • Multimeter
  • Screwdrivers (Phillips and flathead)
  • Pliers
  • Replacement bulbs (if needed)
  • Wiring diagram (for reference)
  • Fuse puller or needle-nose pliers
  • Vehicle owner's manual

Step 1: Check the Fog Light Switch

  1. Visual Inspection: Ensure the fog light switch is not damaged. If the switch feels loose or has a broken mechanism, it may need replacement.
  2. Test Operation: With the vehicle on, toggle the fog light switch and listen for a click or indication. If it feels unresponsive, consider replacing the switch.

Step 2: Inspect the Fog Light Bulbs

  1. Access the Fog Lights: Depending on your Highlander’s design, you may need to jack up the car or access the fog light housing from below.
  2. Remove the Fog Light Assembly: Unscrew any screws or clips holding the fog light assembly in place and gently pull it out.
  3. Check the Bulbs: Inspect the fog light bulbs for any signs of damage, such as a broken filament or darkened glass.
  4. Test the Bulb: If you have a multimeter, set it to the resistance/ohm setting and measure the resistance across the bulb terminals. A reading of infinite resistance indicates a bad bulb.

Step 3: Check the Fuse

  1. Locate the Fuse Box: Open the driver’s side door and find the fuse panel located under the dashboard or in the engine compartment.
  2. Identify the Fog Light Fuse: Refer to the fuse diagram in your owner’s manual to find the specific fuse for the fog lights.
  3. Inspect the Fuse: Remove the fog light fuse using a fuse puller or pliers and visually inspect it. If the metal strip inside is broken, replace it with a new fuse of the same amperage.

Step 4: Test Voltage at the Fog Lights

  1. Reconnect the Fog Light Assembly: Temporarily reconnect the fog light assembly without securing it fully.
  2. Use a Multimeter: Set the multimeter to measure DC voltage.
  3. Test for Voltage: Have someone activate the fog lights while you probe the connector pins. You should see a voltage reading (usually around 12V). If no voltage is present, there may be a wiring issue.

Step 5: Inspect Wiring and Connectors

  1. Check for Damage: Inspect the wiring leading to the fog lights for any visible damage, fraying, or corrosion at the connectors.
  2. Clean Connectors: If you find corrosion, clean the connectors with electrical contact cleaner and a brush.
  3. Repair Wiring: If there are damaged wires, splice in new wire as needed, ensuring to use heat shrink tubing or electrical tape for insulation.
Repair Instructions

Replacing Fog Light Bulbs

  1. Remove the Fog Light Assembly: If not already done, remove the fog light assembly as described in Step 2.
  2. Replace the Bulb: Twist the bulb socket counterclockwise and pull it out. Replace with a new bulb of the same type and twist back into place.
  3. Reinstall the Assembly: Place the fog light assembly back into the housing and secure it with screws or clips.
  4. Test the Fog Lights: Reconnect the battery if it was disconnected and test the fog lights again.

Replacing the Fuse

  1. Install the New Fuse: Insert the new fuse into the correct slot in the fuse box.
  2. Test the Fog Lights: Turn on the fog lights to see if they are functioning.
Final Steps
  1. Reassemble All Components: Ensure everything is put back together securely.
  2. Test Drive: Take the vehicle for a short drive in low visibility conditions to ensure the fog lights operate as expected.
Conclusion

If the fog lights still do not work after these steps, there may be a more complex electrical issue at hand that might require professional diagnostic equipment. Consider consulting a certified Toyota technician for further assistance.