my Ford F-150 12th Generation (2009-2014) rear lights not working, what should I check

Ford F-150 12th Generation (2009-2014)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

533 words

Problem Statement

Learn how to diagnose and fix rear lights not working on Ford F-150 12th Generation. 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 the battery before working on electrical systems to avoid short circuits and electric shock.

Symptoms

•Rear brake lights do not illuminate when the pedal is pressed
•Rear tail lights are non-functional
•Turn signal indicators for the rear are inoperative
•Possible blown fuse for rear lights
•Dashboard warning light for brake system may be illuminated

Diagnostic Steps

1
Inspect the rear light bulbs for any signs of damage or burnout.
2
Check the fuse box for any blown fuses related to the rear lighting circuit.
3
Use a multimeter to test for voltage at the rear light bulb sockets.
4
Inspect the wiring harness for any signs of damage, corrosion, or disconnections.
5
Verify the functionality of the brake light switch located near the brake pedal.
6
Scan for any error codes using an OBD-II scanner to check for related 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

•Socket set
•Multimeter
•Fuse puller
•Screwdrivers (flathead and Phillips)

Parts Required

•Replacement light bulbs (3157)
•Fuses (as needed)
•Brake light switch (if defective)

Related Faults

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Diagnostic Steps

1
Inspect the rear light bulbs for any signs of damage or burnout.
2
Check the fuse box for any blown fuses related to the rear lighting circuit.
3
Use a multimeter to test for voltage at the rear light bulb sockets.
4
Inspect the wiring harness for any signs of damage, corrosion, or disconnections.
5
Verify the functionality of the brake light switch located near the brake pedal.
6
Scan for any error codes using an OBD-II scanner to check for related electrical issues.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle's battery to ensure safety during repairs.

2. Inspect and Replace Bulbs

Remove the rear light assembly by unscrewing any retaining screws.
Carefully pull the assembly away from the vehicle and disconnect the wiring harness.
Remove the old bulbs from their sockets and inspect them for breakage or darkened glass.
Replace any burnt-out bulbs with new ones of the same type (typically 3157 for F-150).

3. Check and Replace Fuses

Locate the fuse box, which is usually under the dashboard or in the engine compartment.
Identify the fuse for the rear lights (refer to the fuse diagram on the fuse box cover).
Use a fuse puller or pliers to remove the fuse and inspect it for continuity; replace if blown.

4. Test and Repair Wiring

Inspect the wiring harness for frayed wires or loose connections.
If damage is found, repair the wiring using electrical tape or connectors as needed.
Ensure all connectors are seated properly and free from corrosion.

5. Check Brake Light Switch

Locate the brake light switch near the brake pedal.
Disconnect the switch connector and test it with a multimeter to ensure it is functioning correctly.
Replace the switch if it is defective.