my Toyota Corolla E170 (2013-2019) headlights go out intermittently, what's causing this?

Toyota Corolla E170 (2013-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

546 words

Problem Statement

Learn to diagnose and fix intermittent headlight failure in 2013-2019 Toyota Corolla E170. Step-by-step guide with symptoms, diagnostics, and repairs.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems
•Allow engine to cool before working on components near the engine

Symptoms

•Headlights flicker or turn off unexpectedly
•Dashboard warning lights may illuminate
•Headlight brightness fluctuates
•Difficulty seeing at night due to inconsistent lighting
•Possible issues with high beams or low beams not functioning properly

Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Inspect headlight bulbs for signs of wear or damage
3
Inspect the headlight fuses in the fuse box for any blown fuses
4
Use a multimeter to test the headlight relay for proper operation
5
Inspect the wiring harness and connectors for corrosion, loose connections, or damage
6
Test the voltage at the headlight connector to ensure it is within specifications

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
•Electrical contact cleaner

Parts Required

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

Related Faults

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Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Inspect headlight bulbs for signs of wear or damage
3
Inspect the headlight fuses in the fuse box for any blown fuses
4
Use a multimeter to test the headlight relay for proper operation
5
Inspect the wiring harness and connectors for corrosion, loose connections, or damage
6
Test the voltage at the headlight connector to ensure it is within specifications

Solution

1. Preparation

Gather Tools: Ensure you have an OBD-II scanner, multimeter, socket set, and replacement parts if necessary.
Safety First: Disconnect the battery to prevent electrical shocks.

2. Replace Headlight Bulbs (if needed)

Remove the Headlight Assembly:
- Open the hood and locate the headlight assembly.
- Remove any screws or clips securing the assembly and carefully pull it out.
Replace Bulb:
- Disconnect the electrical connector from the bulb.
- Remove the old bulb by turning it counterclockwise.
- Install the new bulb by turning it clockwise, ensuring it is secure.
- Reconnect the electrical connector.

3. Check and Replace Fuses (if needed)

Locate the Fuse Box: Find the fuse box, typically under the dashboard or in the engine compartment.
Inspect Fuses: Check the headlight fuses for continuity using a multimeter.
Replace Blown Fuses: If a fuse is blown, replace it with one of the same amperage.

4. Test and Replace Headlight Relay (if needed)

Locate the Relay: Find the headlight relay in the fuse box.
Test the Relay: Use a multimeter to check for continuity and proper operation.
Replace the Relay: If faulty, remove the old relay and install a new one.

5. Repair Wiring or Connectors (if needed)

Inspect Wiring: Look for frayed wires or damaged insulation.
Repair or Replace: If damaged, repair the wiring using electrical tape or replace the harness as necessary.
Clean Connectors: Use an electrical contact cleaner to clean any corroded connectors.