why do my headlights turn off randomly in my Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

533 words

Problem Statement

Learn how to diagnose and fix random headlight issues in Toyota Corolla E170 (2013-2019). 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 battery before working on electrical systems to avoid shocks or shorts.

Symptoms

•Headlights flicker or turn off unexpectedly
•Dashboard warning lights may illuminate
•Difficulty seeing at night or during poor visibility conditions
•Headlight relay may click or buzz
•Battery may show signs of draining faster than usual

Diagnostic Steps

1
Inspect the headlight bulbs for any signs of damage or burning out.
2
Check the headlight fuses for continuity using a multimeter.
3
Scan the vehicle's computer system for any related error codes using an OBD-II scanner.
4
Inspect the wiring harness and connectors for signs of corrosion or loose connections.
5
Test the headlight relay for proper operation.
6
Measure battery voltage and check for any irregularities under load.

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
•Fuse puller
•Pliers
•Electrical contact cleaner

Parts Required

•Headlight bulbs (if faulty)
•Fuses (if blown)
•Headlight relay (if defective)

Related Faults

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Diagnostic Steps

1
Inspect the headlight bulbs for any signs of damage or burning out.
2
Check the headlight fuses for continuity using a multimeter.
3
Scan the vehicle's computer system for any related error codes using an OBD-II scanner.
4
Inspect the wiring harness and connectors for signs of corrosion or loose connections.
5
Test the headlight relay for proper operation.
6
Measure battery voltage and check for any irregularities under load.

Solution

1. Preparation

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

2. Inspect and Replace Headlight Bulbs

Sub-steps:
1. Open the hood and locate the headlight assembly.
2. Remove the headlight bulb socket by twisting it counterclockwise.
3. Pull out the old bulb and inspect for damage; replace with a new bulb if necessary.
4. Reinsert the socket and twist it back into place.

3. Check and Replace Fuses

Sub-steps:
1. Locate the fuse box (typically under the dashboard or in the engine compartment).
2. Remove the headlight fuse using a fuse puller or pliers.
3. Inspect the fuse for continuity; replace with a new fuse of the same amperage if blown.
4. Reinstall the fuse back into the fuse box securely.

4. Test and Replace Relay

Sub-steps:
1. Identify the headlight relay in the fuse box or relay panel.
2. Remove the relay and test it using a multimeter for continuity.
3. Replace the relay with a new one if it fails the test.
4. Reinstall the relay back into its socket.

5. Inspect Wiring and Connectors

Sub-steps:
1. Visually inspect the wiring harness leading to the headlights for frays or breaks.
2. Clean any corrosion from connectors using electrical contact cleaner.
3. Ensure all connections are tight and secure.

6. Reconnect Battery and Test

Reconnect the negative battery terminal.
Turn on the headlights and observe for proper operation.