how to fix Honda Civic 10th Generation (2016-2021) door ajar light staying on

Honda Civic 10th Generation (2016-2021)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

572 words

Problem Statement

Learn how to diagnose and fix the door ajar light issue in Honda Civic 10th Generation (2016-2021). Step-by-step guide with tools and tips.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shorts or shocks.
•Allow the vehicle to cool down before performing any work under the hood.

Symptoms

•Door ajar warning light stays illuminated on the dashboard
•Inconsistent door lock/unlock functionality
•Interior lights remain on when the vehicle is turned off
•Possible battery drain due to lights staying on
•Audible chimes or alerts indicating door is open

Diagnostic Steps

1
Inspect each door's latch and wiring for visible damage or obstructions.
2
Use a multimeter to test the door switch for continuity when the door is closed.
3
Check for any stored error codes using an OBD-II scanner related to the door sensors.
4
Verify the operation of the door lock actuators by manually locking and unlocking each door.
5
Inspect the body control module (BCM) for any fault indicators.

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
•Screwdriver set
•Cleaning solvent
•Cloth

Parts Required

•Door switch (if faulty)
•Lubricant for door latch mechanisms

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect each door's latch and wiring for visible damage or obstructions.
2
Use a multimeter to test the door switch for continuity when the door is closed.
3
Check for any stored error codes using an OBD-II scanner related to the door sensors.
4
Verify the operation of the door lock actuators by manually locking and unlocking each door.
5
Inspect the body control module (BCM) for any fault indicators.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the ignition is off.
Disconnect the negative terminal from the battery to prevent electrical shorts.

2. Inspect and Clean Door Latches

Tools Required: Socket set, cleaning solvent, cloth
Remove any dirt and debris from the door latch area using a cloth and cleaning solvent.
Check for proper movement of the latch mechanism and lubricate if necessary with a suitable lubricant.

3. Test Door Switches

Tools Required: Multimeter
Disconnect the wiring harness from each door switch.
Set the multimeter to continuity mode and probe the switch terminals.
Press the switch (simulate the door closing) and check for continuity. If there's no continuity when the switch is pressed, replace the switch.

4. Replace Faulty Door Switch

Tools Required: Screwdriver set, new door switch
Remove the old door switch from the door frame by unscrewing it.
Install the new door switch by securing it with screws and reconnecting the wiring harness.
Repeat for each door switch if necessary.

5. Check Body Control Module

Tools Required: OBD-II scanner
Reconnect the battery and start the vehicle.
Use the OBD-II scanner to check for any fault codes related to the body control module.
If codes are present, follow the manufacturer's guidelines for troubleshooting the BCM, which may involve further diagnostics or replacement.