my Ford F-150 13th Generation (2015-2020) door ajar light stays on, what can I do

Ford F-150 13th Generation (2015-2020)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

462 words

Problem Statement

Learn how to diagnose and fix the door ajar light issue in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures 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 shock or short circuits.

Symptoms

•Door ajar warning light remains illuminated on the dashboard
•Interior lights stay on when doors are closed
•Possible battery drain from lights remaining on
•Alerts or chimes indicating doors are open when they are closed
•Inconsistent door lock/unlock functionality

Diagnostic Steps

1
Inspect each door for proper closure and alignment.
2
Use an OBD-II scanner to check for any related error codes.
3
Manually press the door switch to see if the light turns off.
4
Check the wiring harness and connectors for damage or corrosion.
5
Test the door switch with a multimeter to ensure proper function.

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
•Wire cutters/strippers
•Electrical tape

Parts Required

•Replacement door switch (specific to model)

Related Faults

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Diagnostic Steps

1
Inspect each door for proper closure and alignment.
2
Use an OBD-II scanner to check for any related error codes.
3
Manually press the door switch to see if the light turns off.
4
Check the wiring harness and connectors for damage or corrosion.
5
Test the door switch with a multimeter to ensure proper function.

Solution

1. Preparation

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

Tools Required:

OBD-II scanner
Multimeter
Screwdriver set
Wire cutters/strippers
Electrical tape

2. Inspect Door Switch

Remove the door panel to access the door switch.
- Unscrew any visible screws and gently pry off the door panel.
Visually inspect the door switch for wear or damage.
If the switch appears faulty, proceed to replace it.

3. Replace Faulty Door Switch

Disconnect the wiring harness from the faulty door switch.
Remove the switch from its mounting location.
Install the new door switch in reverse order.
Reconnect the wiring harness securely.

4. Reassemble Door Panel

Place the door panel back onto the door frame.
Reattach all screws and clips to secure the panel.
Ensure that all electrical connections are properly seated.

5. Reconnect Battery and Test

Reconnect the negative battery terminal.
Check if the door ajar light turns off after closing the doors.
Test the functionality of the door locks and any alerts.