how to troubleshoot my Toyota Corolla E170 (2013-2019) if the headlights won’t turn on?

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

562 words

Problem Statement

Learn how to troubleshoot and fix headlight issues in Toyota Corolla E170 (2013-2019). Step-by-step guide with 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 working on electrical systems to avoid shocks or shorts.
•Allow the headlights to cool down before handling to avoid burns.

Symptoms

•Headlight switch does not activate headlights
•No illumination from low beams or high beams
•Dashboard indicator for headlights is off
•Other exterior lights (turn signals, brake lights) function normally
•Possible flickering or intermittent operation before failure

Diagnostic Steps

1
Verify that the headlight switch is in the 'ON' position.
2
Check the headlight bulbs for damage or burnout.
3
Inspect the headlight fuses in the fuse box.
4
Test the headlight relay for continuity and proper operation.
5
Use a multimeter to check for voltage at the headlight connectors.
6
Inspect the wiring harness for frayed wires or loose connections.

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
•Screwdriver
•Fuse puller or needle-nose pliers

Parts Required

•Headlight bulbs (if burnt out)
•Headlight fuses (if blown)
•Headlight relay (if faulty)

Related Faults

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Diagnostic Steps

1
Verify that the headlight switch is in the 'ON' position.
2
Check the headlight bulbs for damage or burnout.
3
Inspect the headlight fuses in the fuse box.
4
Test the headlight relay for continuity and proper operation.
5
Use a multimeter to check for voltage at the headlight connectors.
6
Inspect the wiring harness for frayed wires or loose connections.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative battery terminal to prevent electrical shock.

2. Check and Replace Headlight Bulbs

Tools Required: Socket set, screwdriver
Instructions:
1. Open the hood and locate the headlight assembly.
2. Remove the retaining clips or screws securing the headlight assembly.
3. Disconnect the electrical connector from the rear of the headlight bulb.
4. Remove the old bulb by twisting it counter-clockwise.
5. Install the new bulb by inserting it and twisting it clockwise.
6. Reconnect the electrical connector and secure the headlight assembly back in place.

3. Inspect and Replace Headlight Fuses

Tools Required: Fuse puller or needle-nose pliers
Instructions:
1. Locate the fuse box (usually under the dashboard or in the engine compartment).
2. Refer to the fuse box diagram to identify the headlight fuse.
3. Remove the fuse and inspect it for continuity (a blown fuse will have a broken filament).
4. Replace the blown fuse with a new one of the same amperage.

4. Test and Replace Headlight Relay

Tools Required: Multimeter
Instructions:
1. Locate the headlight relay in the fuse box or relay panel.
2. Remove the relay and check for continuity using a multimeter.
3. If faulty, replace it with a new relay.

5. Inspect Wiring and Connections

Tools Required: Multimeter, wiring diagram
Instructions:
1. Visually inspect the wiring from the headlight assembly to the fuse box for any signs of damage.
2. Use the multimeter to check for continuity in the wires.
3. Repair or replace any damaged wiring or connectors as necessary.