how to fix my Ford F-150 13th Generation (2015-2020) headlights not turning off

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

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

496 words

Problem Statement

Learn how to diagnose and fix headlights that won't turn off 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 components to avoid shock.

Symptoms

•Headlights remain illuminated even after the engine is off
•Dashboard lights may also stay on
•Possible battery drain leading to difficulty in starting the vehicle
•Headlight switch feels unresponsive or sticky
•Headlights flicker or dim intermittently

Diagnostic Steps

1
Inspect the headlight switch for any visible signs of damage or malfunction.
2
Use an OBD-II scanner to check for any stored error codes related to the lighting system.
3
Check the headlight relay by swapping it with a similar relay in the fuse box to see if the issue persists.
4
Test the battery voltage to ensure it is fully charged and not causing electrical issues.
5
Inspect wiring harnesses related to the headlight circuit for fraying or shorts.
6
Verify the operation of the automatic headlight feature, if equipped.

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
•Trim removal tool
•Screwdriver set

Parts Required

•Headlight switch (if defective)
•Headlight relay (if defective)

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Diagnostic Steps

1
Inspect the headlight switch for any visible signs of damage or malfunction.
2
Use an OBD-II scanner to check for any stored error codes related to the lighting system.
3
Check the headlight relay by swapping it with a similar relay in the fuse box to see if the issue persists.
4
Test the battery voltage to ensure it is fully charged and not causing electrical issues.
5
Inspect wiring harnesses related to the headlight circuit for fraying or shorts.
6
Verify the operation of the automatic headlight feature, if equipped.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shock or short circuits.

2. Inspect and Replace Headlight Switch

Remove the trim panel surrounding the headlight switch using a trim removal tool.
Disconnect the electrical connector from the back of the headlight switch.
Using a multimeter, test the switch for continuity. If defective, replace it with a new switch.
Reconnect the electrical connector and reinstall the trim panel.

3. Check and Replace Headlight Relay

Locate the fuse box under the hood and identify the headlight relay (refer to the owner's manual for exact location).
Swap the headlight relay with another relay of the same type in the fuse box.
If the headlights turn off after this swap, replace the faulty relay with a new one.

4. Inspect Wiring Harness

Visually inspect the wiring harness leading to the headlights for any signs of damage or corrosion.
Repair or replace any damaged wiring to ensure proper connectivity.

5. Reconnect Battery

Reconnect the negative battery terminal securely.
Ensure all tools and loose items are removed from the engine bay.