why are my Ford F-150 13th Generation (2015-2020) interior lights staying on

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

518 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 battery before working on electrical systems to avoid shorts or shocks.

Symptoms

•Interior lights remain on after closing doors
•Dome light stays lit when the ignition is off
•Battery drains when the vehicle is not in use
•Warning message on the dashboard regarding a door being ajar
•Malfunctioning door lock/unlock features

Diagnostic Steps

1
Inspect each door switch for proper functionality and ensure they are not stuck or jammed.
2
Use an OBD-II scanner to check for any error codes that may indicate an issue with the BCM (Body Control Module).
3
Check the vehicle's settings in the infotainment system to ensure the interior light settings are configured correctly.
4
Visually inspect the wiring harnesses connected to the door switches for damage or corrosion.
5
Test the door switches with a multimeter to verify they are opening and closing the circuit as intended.

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

Parts Required

•Door switches (if defective)
•Body Control Module (if necessary)

Related Faults

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Diagnostic Steps

1
Inspect each door switch for proper functionality and ensure they are not stuck or jammed.
2
Use an OBD-II scanner to check for any error codes that may indicate an issue with the BCM (Body Control Module).
3
Check the vehicle's settings in the infotainment system to ensure the interior light settings are configured correctly.
4
Visually inspect the wiring harnesses connected to the door switches for damage or corrosion.
5
Test the door switches with a multimeter to verify they are opening and closing the circuit as intended.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect and Replace Door Switches

Locate the Door Switches: Identify the door switches for each door.
Remove the Door Panel:
- Use a screwdriver to remove screws.
- Carefully pry off the door panel with a trim tool.
Disconnect the Switch:
- Locate the wiring connector for the door switch and disconnect it.
Test the Switch:
- Use a multimeter to check continuity when the switch is pressed.
Replace if Faulty:
- If the switch is defective, replace it with a new component.
- Reconnect the wiring harness and reassemble the door panel.

3. Inspect Body Control Module (BCM)

Access the BCM: Locate the BCM, typically found under the dashboard.
Check Connections: Ensure all connectors are seated properly and free of corrosion.
Reprogram or Replace if Necessary: If there are BCM fault codes, consult service manual for reprogramming steps or consider replacement.

4. Verify Interior Light Settings

Access Infotainment System: Use the vehicle's infotainment screen to navigate to vehicle settings.
Adjust Lighting Settings: Ensure that the settings for interior lights are set to turn off after doors close.