how to fix my Toyota Highlander’s headlights not working

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

511 words

Problem Statement

Learn how to diagnose and fix non-working headlights in your Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before performing electrical work.
•Allow the vehicle to cool before handling components in the engine compartment.

Symptoms

•Headlights do not illuminate when switched on
•Dashboard lights dim or flicker when headlights are activated
•High beams may work while low beams do not
•No clicking sound from the headlight relay when activated
•Check engine or warning lights illuminated on the dashboard

Diagnostic Steps

1
Inspect the headlight bulbs for signs of breakage or burn-out.
2
Check the headlight fuses in the fuse box for continuity.
3
Use a multimeter to test the voltage at the headlight connector.
4
Examine the headlight switch for functionality.
5
Inspect wiring and connections for corrosion or damage.

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

•Socket set
•Multimeter
•Wire stripper
•Crimping tool

Parts Required

•Headlight bulbs
•Fuses (if blown)
•Headlight switch (if faulty)

Related Faults

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Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shock.
Tools Required: Socket set, multimeter, wire stripper, and crimping tool.

2. Inspect and Replace Headlight Bulbs

Open the hood and locate the headlight assembly.
Remove the headlight assembly cover or access panel.
Twist the bulb socket counterclockwise to remove it.
Remove the old bulb and replace it with a new one, ensuring not to touch the glass part with bare hands.
Reinstall the bulb socket and cover the headlight assembly.

3. Check and Replace Fuses

Locate the fuse box, usually found under the dashboard or in the engine compartment.
Identify the headlight fuse using the diagram on the fuse box cover.
Remove the fuse using a fuse puller or pliers.
Inspect the fuse for continuity; replace it if blown with the same amperage rating.
Reinstall the fuse and close the fuse box.

4. Test the Headlight Switch

Remove the headlight switch from the steering column or dashboard.
Use a multimeter to check for continuity across the switch terminals.
If the switch is faulty, replace it with a new one.
Reinstall the headlight switch.

5. Inspect Wiring and Connectors

Visually inspect the wiring harness connected to the headlights.
Look for frayed wires or corrosion on the connectors.
Repair or replace any damaged wiring or connectors.
Reconnect all components securely.