why do my interior lights stay on in my Ford F-150 13th Generation (2015-2020)

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

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

497 words

Problem Statement

Learn how to diagnose and fix interior lights that stay on in Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shorts.

Symptoms

•Interior lights do not turn off after closing doors
•Dome light remains on while driving
•Battery drains overnight
•Possible warning message on the dashboard
•Doors may not lock automatically

Diagnostic Steps

1
Inspect the door switches for proper operation and ensure they are not stuck or malfunctioning.
2
Verify the light settings on the overhead console and ensure they are set to the 'off' position.
3
Use an OBD-II scanner to check for any electrical system error codes.
4
Inspect the wiring harnesses and connections at the door for any damage or corrosion.
5
Test the interior light relay in the fuse box for 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

•Multimeter
•OBD-II scanner
•Screwdriver set
•Flashlight

Parts Required

•Door switch (if defective)
•Overhead light switch (if defective)
•Interior light relay (if defective)

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Diagnostic Steps

1
Inspect the door switches for proper operation and ensure they are not stuck or malfunctioning.
2
Verify the light settings on the overhead console and ensure they are set to the 'off' position.
3
Use an OBD-II scanner to check for any electrical system error codes.
4
Inspect the wiring harnesses and connections at the door for any damage or corrosion.
5
Test the interior light relay in the fuse box for proper function.

Solution

1. Preparation

Gather tools: multimeter, OBD-II scanner, screwdriver set, and a flashlight.
Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect Door Switches

Sub-steps:
1. Remove the door panel using a screwdriver and trim removal tool.
2. Locate the door switch and disconnect the electrical connector.
3. Use a multimeter to test continuity of the switch; it should show continuity when pressed.
4. Replace the switch if it fails the test.

3. Check Light Settings

Sub-steps:
1. Locate the overhead light controls on the ceiling console.
2. Ensure the switch is set to 'off' or 'door' instead of 'on'.
3. If the switch is faulty, replace it with a new component.

4. Inspect Wiring and Connections

Sub-steps:
1. Visually inspect the wiring harnesses at the door for frays or disconnections.
2. Repair any damaged wires or ensure connections are secure.
3. Use dielectric grease to prevent corrosion on connectors.

5. Test Interior Light Relay

Sub-steps:
1. Locate the fuse box and find the relay for the interior lights.
2. Swap it with a similar relay to check for functionality.
3. Replace the relay if the lights still do not function correctly.