how to fix my Toyota Highlander XU70 (2020-Present) fog lights not turning on

Toyota Highlander XU70 (2020-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

4 min read

605 words

Problem Statement

Learn how to diagnose and fix fog lights not turning on in a 2020-present Toyota Highlander XU70. Step-by-step guide with tools and parts required.

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 shock or short circuits.
•Allow the engine to cool before accessing components near the engine bay.

Symptoms

•Fog lights do not illuminate when activated
•Fog light indicator on the dashboard is not illuminated
•No unusual noises or flickering when attempting to activate fog lights
•Other exterior lights (headlights, turn signals) function normally
•Possible blown fuse related to fog lights

Diagnostic Steps

1
Check the fog light switch and verify it is in the 'on' position.
2
Inspect the fog light bulbs for any signs of damage or burn-out.
3
Use an OBD-II scanner to check for any related error codes.
4
Examine the fog light fuse in the fuse box for continuity; replace if blown.
5
Test the fog light relay for proper operation using a multimeter.
6
Visually inspect wiring and connectors for any signs of damage or corrosion.

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

•OBD-II scanner
•Multimeter
•Socket set
•Fuse puller or needle-nose pliers
•Flathead screwdriver

Parts Required

•Fog light bulbs (as needed)
•Fog light fuse (if blown)
•Fog light relay (if defective)

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Diagnostic Steps

1
Check the fog light switch and verify it is in the 'on' position.
2
Inspect the fog light bulbs for any signs of damage or burn-out.
3
Use an OBD-II scanner to check for any related error codes.
4
Examine the fog light fuse in the fuse box for continuity; replace if blown.
5
Test the fog light relay for proper operation using a multimeter.
6
Visually inspect wiring and connectors for any signs of damage or corrosion.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and the ignition is off.
Disconnect the negative battery terminal for safety.

2. Inspect and Replace Bulbs

Tools Required: Socket set, flathead screwdriver
Locate the fog light housing under the front bumper.
Remove any necessary trim pieces or fasteners to access the fog light assembly.
Disconnect the electrical connector from the fog light.
Remove the fog light bulb by twisting it counterclockwise and pulling it out of the socket.
Insert a new fog light bulb, ensuring it is securely in place.
Reconnect the electrical connector and reassemble the fog light housing.

3. Check and Replace Fuse

Tools Required: Fuse puller or needle-nose pliers
Locate the fuse box, typically found under the dashboard or in the engine compartment.
Refer to the fuse diagram to locate the fog light fuse.
Use a fuse puller to remove the fog light fuse.
Inspect the fuse for continuity; if it is blown, replace it with a fuse of the same amperage.
Reinstall the fuse and ensure it is seated properly in the fuse box.

4. Test and Replace Relay (if necessary)

Tools Required: Multimeter
Locate the fog light relay in the fuse box.
Remove the relay and test it with a multimeter to ensure it activates when power is applied.
If the relay fails the test, replace it with a new one.
Reinstall the relay in the fuse box.