my Honda Civic 10th Generation (2016-2021) headlights are not turning off

Honda Civic 10th Generation (2016-2021)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

476 words

Problem Statement

Learn how to diagnose and fix headlights that won't turn off in Honda Civic 10th Generation (2016-2021). Step-by-step guide with symptoms and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to avoid shock or short circuits.

Symptoms

•Headlights remain illuminated even after the vehicle is turned off.
•Dashboard warning lights related to lighting may be illuminated.
•Headlight switch feels loose or does not click into position.
•Battery drains quickly due to headlights being left on.
•Possible flickering of headlights before they remain on continuously.

Diagnostic Steps

1
Inspect the headlight switch for physical damage or signs of malfunction.
2
Use an OBD-II scanner to check for any related error codes that may indicate electrical issues.
3
Test the headlight relay for proper operation using a multimeter.
4
Check the wiring and connections leading to the headlights for shorts or corrosion.
5
Verify the operation of the automatic headlight function if equipped by observing the behavior in varying light conditions.

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
•Screwdriver set
•Torque wrench

Parts Required

•Headlight switch (if defective)
•Headlight relay (if defective)

Related Faults

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Symptoms

•Headlights remain illuminated even after the vehicle is turned off.

•Dashboard warning lights related to lighting may be illuminated.

•Headlight switch feels loose or does not click into position.

•Battery drains quickly due to headlights being left on.

•Possible flickering of headlights before they remain on continuously.

Diagnostic Steps

1
Inspect the headlight switch for physical damage or signs of malfunction.
2
Use an OBD-II scanner to check for any related error codes that may indicate electrical issues.
3
Test the headlight relay for proper operation using a multimeter.
4
Check the wiring and connections leading to the headlights for shorts or corrosion.
5
Verify the operation of the automatic headlight function if equipped by observing the behavior in varying light conditions.

Solution

1. Preparation

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

2. Inspect and Replace the Headlight Switch

Remove the steering column cover (if applicable) to access the headlight switch.
Disconnect the wiring harness from the headlight switch.
Remove the headlight switch by unscrewing any retaining screws.
Install the new headlight switch by reversing the removal steps.
Reconnect the battery and test the switch operation.

3. Inspect and Replace the Headlight Relay

Locate the fuse box (typically under the dashboard or hood).
Identify the headlight relay using the fuse box diagram.
Remove the relay and test it with a multimeter for continuity.
If faulty, replace it with a new relay by inserting it into the relay slot.

4. Check and Repair Wiring

Inspect the wiring harness leading to the headlights for any signs of wear, corrosion, or damage.
Repair or replace any damaged wires or connectors.
Ensure all connections are secure and free from moisture.