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

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

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

512 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 symptoms, diagnostic steps, and repair instructions.

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 shock or short circuits.

Symptoms

•Door ajar light remains on
•Dome lights stay illuminated
•Possible battery drain when the vehicle is off
•Difficulty locking the doors using the remote or key fob
•Alerts or messages on the dashboard related to door status

Diagnostic Steps

1
Inspect each door switch for physical damage or malfunction.
2
Use an OBD-II scanner to check for any related error codes.
3
Check the wiring and connectors associated with the door switches for corrosion or disconnection.
4
Test each door switch with a multimeter to ensure they are functioning correctly.
5
Inspect the door latch mechanism for any obstructions or misalignment.

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
•Trim removal tool
•Socket set

Parts Required

•Door switch (if faulty)
•Electrical connectors (if necessary)

Related Faults

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Diagnostic Steps

1
Inspect each door switch for physical damage or malfunction.
2
Use an OBD-II scanner to check for any related error codes.
3
Check the wiring and connectors associated with the door switches for corrosion or disconnection.
4
Test each door switch with a multimeter to ensure they are functioning correctly.
5
Inspect the door latch mechanism for any obstructions or misalignment.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative terminal of the battery to ensure safety while working on electrical components.

2. Inspect and Replace Faulty Door Switch

Remove the door panel from the affected door:
- Use a screwdriver to remove screws securing the door panel.
- Carefully pry off the panel using a trim removal tool to avoid damaging clips.
Locate the door switch:
- The switch is typically located near the door latch or on the door frame.
Disconnect the electrical connector from the door switch.
Test the door switch with a multimeter:
- Set the multimeter to continuity mode.
- Press the switch and check for continuity; if there is none, replace the switch.
Install the new door switch:
- Connect the electrical connector to the new switch.
- Secure the switch in place.
Reattach the door panel:
- Align the panel with the clips and press firmly to secure it.
- Reinstall screws to hold the door panel.

3. Check Wiring and Connectors

Inspect the wiring harness connected to the door switches:
- Look for frayed wires, corrosion, or loose connections.
Repair or replace any damaged wiring as necessary.

4. Final Assembly

Reconnect the negative terminal of the battery.
Test all doors to ensure the door ajar light functions correctly.