how to fix my Toyota Highlander Third Generation (2014-2019) headlights not turning on

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

548 words

Problem Statement

Learn how to diagnose and fix headlights not turning on in Toyota Highlander (2014-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to prevent shorts.
•Allow the engine to cool before touching any components in the engine bay.

Symptoms

•Headlights remain off when activated
•Dashboard indicator for headlights may be illuminated
•Fog lights functioning (if equipped)
•High beams may or may not function
•No clicking sound when switching headlight settings
•Possible dimming of interior lights when headlights are attempted to be turned on

Diagnostic Steps

1
Check the headlight switch for proper operation.
2
Inspect the headlight fuses using the fuse box diagram.
3
Test the headlight bulbs for continuity using a multimeter.
4
Examine the wiring harness for any visible damage or corrosion.
5
Confirm the battery voltage and connections are secure and functioning.
6
Scan for any error codes using an OBD-II scanner.

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
•Socket set
•Fuse puller
•OBD-II scanner

Parts Required

•Headlight bulbs (H11 and/or 9005)
•Headlight fuse (if needed)
•Headlight relay (if needed)

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Symptoms

•Headlights remain off when activated

•Dashboard indicator for headlights may be illuminated

•Fog lights functioning (if equipped)

•High beams may or may not function

•No clicking sound when switching headlight settings

•Possible dimming of interior lights when headlights are attempted to be turned on

Diagnostic Steps

1
Check the headlight switch for proper operation.
2
Inspect the headlight fuses using the fuse box diagram.
3
Test the headlight bulbs for continuity using a multimeter.
4
Examine the wiring harness for any visible damage or corrosion.
5
Confirm the battery voltage and connections are secure and functioning.
6
Scan for any error codes using an OBD-II scanner.

Solution

1. Preparation

Gather tools: multimeter, socket set, fuse puller, and OBD-II scanner.
Ensure the vehicle is parked on a level surface with the engine turned off and keys removed from the ignition.

2. Inspect and Replace Fuses

Locate the fuse box under the dashboard on the driver's side and the engine compartment.
Use the fuse puller to remove the headlight fuse (check owner's manual for exact location).
Inspect the fuse for continuity; if blown, replace it with a fuse of the same amperage rating.

3. Check and Replace Headlight Bulbs

Open the hood and locate the headlight assembly.
Remove the retaining clips or screws securing the headlight assembly.
Disconnect the wiring harness from the headlight bulb.
Remove the old bulb and inspect for burn marks or broken filaments.
If faulty, replace it with a new bulb, ensuring it matches the specification (usually H11 for low beams and 9005 for high beams).

4. Inspect Wiring and Connectors

Visually inspect the wiring harness connected to the headlight assembly for any signs of wear, fraying, or breaks.
Clean any corrosion found on connectors and ensure they are firmly connected.
If damaged wiring is found, repair or replace as necessary.

5. Check the Headlight Relay

Locate the headlight relay in the fuse box (refer to the owner's manual for location).
Remove the relay and test it by swapping with a similar relay (e.g., horn relay).
If the headlights work with the swapped relay, replace the faulty relay with a new one.