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

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

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

487 words

Problem Statement

Learn how to diagnose and fix the door ajar light issue on your Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, 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 shorts or shocks.

Symptoms

•Door ajar warning light illuminated on the dashboard
•Chime sound alerting that a door is open
•Interior lights remaining on when the vehicle is off
•Possible issues with keyless entry or locking system
•Difficulty locking/unlocking doors remotely

Diagnostic Steps

1
Inspect each door's latch mechanism for debris or damage.
2
Use an OBD-II scanner to check for any error codes related to the door sensors.
3
Test the door ajar switch for functionality by manually operating it.
4
Inspect wiring and connectors around the door hinges for wear or disconnection.
5
Check the body control module (BCM) for faults or miscommunication.
6
Verify the battery voltage to ensure it is within the normal range to rule out electrical 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

•OBD-II scanner
•Multimeter
•Flashlight
•Cleaning brush
•Wire harness repair kit
•Electrical tape

Parts Required

•Door ajar switch (if faulty)
•Wiring harness (if damaged)

Related Faults

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Diagnostic Steps

1
Inspect each door's latch mechanism for debris or damage.
2
Use an OBD-II scanner to check for any error codes related to the door sensors.
3
Test the door ajar switch for functionality by manually operating it.
4
Inspect wiring and connectors around the door hinges for wear or disconnection.
5
Check the body control module (BCM) for faults or miscommunication.
6
Verify the battery voltage to ensure it is within the normal range to rule out electrical issues.

Solution

1. Preparation

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

2. Inspect Door Latch Mechanisms

Tools Required: Flashlight, cleaning brush
Inspect each door latch for dirt or debris.
Clean the latch area with a brush if necessary.
Ensure the latch moves freely and is not obstructed.

3. Check Door Ajar Switch

Tools Required: Multimeter
Locate the door ajar switch for each door.
Disconnect the switch connector and use a multimeter to check for continuity.
If the switch is faulty, replace it.

4. Inspect Wiring and Connectors

Tools Required: Wire harness repair kit, electrical tape
Inspect wiring harnesses around the door hinges for fraying or breaks.
Repair any damaged wires using a wire harness repair kit and secure with electrical tape.

5. Test Body Control Module (BCM)

Tools Required: OBD-II scanner
Reconnect the battery and start the vehicle.
Use the OBD-II scanner to check for BCM-related error codes.
If codes are present, follow troubleshooting steps specific to those codes or replace the BCM if necessary.