how to fix the headlights on my Toyota Highlander Third Generation (2014-2019) that won't turn on

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

540 words

Problem Statement

Learn how to diagnose and fix headlights not turning on in Toyota Highlander (2014-2019). Step-by-step guide with tools, parts, and safety tips.

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 avoid shock or short circuits.

Symptoms

•Headlight switch does not activate the headlights
•Dashboard warning lights related to headlights illuminated
•High beams may work while low beams do not
•Flickering or dimming of headlights before failure
•No response from headlights despite functional battery

Diagnostic Steps

1
Inspect the headlight switch for any physical damage or wear.
2
Use an OBD-II scanner to check for any relevant error codes.
3
Verify the headlight bulb integrity by visually inspecting them for burnouts or damage.
4
Check the fuse for the headlights in the fuse box; replace if blown.
5
Use a multimeter to test for voltage at the headlight connector.
6
Inspect wiring and connectors for any signs of corrosion or disconnection.

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 pliers
•Wire strippers
•Soldering iron or crimp connectors
•Electrical tape

Parts Required

•Headlight bulbs (if defective)
•Headlight fuse (if blown)

Related Faults

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Diagnostic Steps

1
Inspect the headlight switch for any physical damage or wear.
2
Use an OBD-II scanner to check for any relevant error codes.
3
Verify the headlight bulb integrity by visually inspecting them for burnouts or damage.
4
Check the fuse for the headlights in the fuse box; replace if blown.
5
Use a multimeter to test for voltage at the headlight connector.
6
Inspect wiring and connectors for any signs of corrosion or disconnection.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Replace Headlight Bulbs

Tools Required: Socket set, gloves
Sub-steps:
1. Open the hood and locate the headlight assembly.
2. Remove the headlight assembly by unscrewing any retaining screws.
3. Disconnect the electrical connector from the back of the bulb.
4. Remove the old bulb by twisting it counterclockwise.
5. Install the new bulb by inserting it and twisting it clockwise to secure.
6. Reconnect the electrical connector and reassemble the headlight assembly.

3. Check and Replace the Fuse

Tools Required: Fuse puller or pliers
Sub-steps:
1. Locate the fuse box; refer to the owner’s manual for the exact location.
2. Identify the headlight fuse using the diagram on the fuse box cover.
3. Remove the fuse with the fuse puller or pliers.
4. Inspect the fuse to see if the wire is broken; replace it with a new fuse of the same amperage.
5. Reinstall the fuse back into its slot.

4. Repair or Replace Wiring and Connectors

Tools Required: Wire strippers, soldering iron or crimp connectors, electrical tape
Sub-steps:
1. Inspect all wiring leading to the headlight assembly for frays or breaks.
2. If damaged, cut out the damaged section and strip the wires.
3. Use soldering or crimp connectors to connect the new wire segment.
4. Wrap any exposed areas with electrical tape for insulation.