how to fix my Toyota Corolla E170 (2013-2019) when the lights won’t turn off

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

587 words

Problem Statement

Learn how to diagnose and fix headlights that won't turn off in Toyota Corolla E170 (2013-2019). Step-by-step guide with tools and solutions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to avoid shock or short circuits.
•Ensure that the vehicle is in a safe, stable position while working on it.

Symptoms

•Headlights remain on after the ignition is turned off
•Dashboard warning lights may illuminate
•Battery drains quickly when the car is not in use
•Possible malfunction of the headlight switch
•Interior lights may not function properly

Diagnostic Steps

1
Check the headlight switch for proper functionality and position.
2
Inspect the battery and fuse box for any blown fuses related to the lighting system.
3
Use an OBD-II scanner to check for any error codes that may indicate a malfunctioning module.
4
Inspect the wiring harness connected to the headlight assembly for any damage or short circuits.
5
Test the multifunction switch (which controls the headlights) for continuity using a multimeter.
6
Check the body control module (BCM) for any faults or programming issues.

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
•OBD-II scanner
•Screwdrivers
•Wiring harness repair kit

Parts Required

•Headlight switch (if faulty)
•Multifunction switch (if faulty)
•Wiring harness repair kit (if wiring is damaged)

Related Faults

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Diagnostic Steps

1
Check the headlight switch for proper functionality and position.
2
Inspect the battery and fuse box for any blown fuses related to the lighting system.
3
Use an OBD-II scanner to check for any error codes that may indicate a malfunctioning module.
4
Inspect the wiring harness connected to the headlight assembly for any damage or short circuits.
5
Test the multifunction switch (which controls the headlights) for continuity using a multimeter.
6
Check the body control module (BCM) for any faults or programming issues.

Solution

1. Preparation

Tools Required: Multimeter, socket set, OBD-II scanner, screwdrivers, wiring harness repair kit.
Disconnect the negative battery terminal to prevent any electrical shorts during the repair.

2. Inspect and Replace the Headlight Switch

Remove the steering column cover using a screwdriver.
Disconnect the headlight switch wiring harness.
Test the headlight switch with a multimeter for continuity in all positions.
If the switch is faulty, replace it with a new component.
Reconnect the wiring harness and reassemble the steering column cover.

3. Inspect the Multifunction Switch

Remove the steering wheel airbag according to manufacturer specifications (ensure the battery is disconnected).
Detach the steering wheel using a socket set.
Remove the multifunction switch from the steering column.
Perform a continuity test on the multifunction switch with the multimeter.
Replace the multifunction switch if it fails the test.
Reassemble the steering wheel and reconnect the airbag.

4. Check and Repair Wiring

Inspect the wiring harness for any damaged wires, especially around the headlight assembly.
Repair any damaged wiring using a wiring harness repair kit.
Ensure all connections are secure and free from corrosion.

5. Reset the Body Control Module (BCM)

Reconnect the negative battery terminal.
Use the OBD-II scanner to clear any fault codes from the BCM.
Perform a reset procedure on the BCM, if applicable, according to the service manual.