my Ford F-150 13th Generation (2015-2020) interior lights stay on when the doors are closed

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

533 words

Problem Statement

Learn how to diagnose and fix the issue of interior lights staying on in Ford F-150 2015-2020. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent short circuits.
•Allow the vehicle to cool down before handling any components that may be hot.

Symptoms

•Interior lights remain on after closing all doors
•Possible battery drain if the vehicle is not used for an extended period
•"Door Ajar" warning light illuminated on the dashboard
•Malfunctioning power door locks
•Inconsistent operation of other interior electrical features

Diagnostic Steps

1
Inspect each door switch for proper operation and physical damage.
2
Use an OBD-II scanner to check for any related error codes.
3
Test each door switch with a multimeter to ensure they are functioning properly.
4
Examine the wiring harness connected to the door switches for any signs of wear or damage.
5
Verify the operation of the vehicle's Body Control Module (BCM) through diagnostic tools.

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

•Multimeter
•OBD-II scanner
•Screwdriver set
•Wire stripper/crimper
•Electrical tape

Parts Required

•Replacement door switches (if faulty)
•Wiring harness connectors (if damaged)

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Diagnostic Steps

1
Inspect each door switch for proper operation and physical damage.
2
Use an OBD-II scanner to check for any related error codes.
3
Test each door switch with a multimeter to ensure they are functioning properly.
4
Examine the wiring harness connected to the door switches for any signs of wear or damage.
5
Verify the operation of the vehicle's Body Control Module (BCM) through diagnostic tools.

Solution

1. Preparation

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

Tools Required:

Multimeter
OBD-II scanner
Screwdriver set
Wire stripper/crimper
Electrical tape

2. Inspect Door Switches

Remove the door panel for each door to access the door switches.
Sub-steps:
- Unscrew any screws securing the door panel.
- Carefully pry off the panel using a trim removal tool.
- Locate the door switch and visually inspect for damage or disconnection.

3. Test Door Switches

Use a multimeter to test continuity of each door switch.
Sub-steps:
- Set the multimeter to continuity mode.
- With the switch activated (pressed), check for a closed circuit.
- If the switch fails, replace it with a new one.

4. Inspect Wiring Harness

Check the wiring harness connected to the door switches.
Sub-steps:
- Look for any frayed or damaged wires.
- Repair any damaged wiring using electrical tape or by replacing sections as needed.

5. Verify Body Control Module Functionality

If all switches are functioning but the issue persists, check the BCM.
Sub-steps:
- Use the OBD-II scanner to check for BCM-related error codes.
- If errors are present, consider reprogramming or replacing the BCM.