how to fix Ford F-150 13th Generation (2015-2020) rear window defrost not working

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

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

510 words

Problem Statement

Learn how to diagnose and fix rear window defrost issues in Ford F-150 13th Generation (2015-2020). Step-by-step guide with tools and parts required.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shock or short circuits.

Symptoms

•Rear defrost indicator light does not illuminate when activated
•No heat or warmth felt on the rear window surface
•Unresponsive defrost button when pressed
•Check for related electrical faults (e.g., blown fuses)
•Potential fogging or frost remains on the rear window during cold weather

Diagnostic Steps

1
Inspect the rear defrost fuse in the fuse box for continuity.
2
Use a multimeter to check the voltage at the rear defrost grid connector.
3
Examine the rear window defrost grid for visible damage or breaks.
4
Test the defrost switch for proper operation.
5
Verify the wiring harness for any signs of wear or disconnection.

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
•Fuse puller
•Screwdriver set

Parts Required

•Rear defrost fuse (10A)
•Rear defrost repair kit (if grid is damaged)

Related Faults

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Diagnostic Steps

1
Inspect the rear defrost fuse in the fuse box for continuity.
2
Use a multimeter to check the voltage at the rear defrost grid connector.
3
Examine the rear window defrost grid for visible damage or breaks.
4
Test the defrost switch for proper operation.
5
Verify the wiring harness for any signs of wear or disconnection.

Solution

1. Preparation

Tools Required:
- Multimeter
- Fuse puller
- Screwdriver set
Disconnect the negative battery terminal to ensure safety while working on electrical systems.

2. Inspect and Replace the Fuse

Locate the fuse box, usually found under the dashboard on the driver's side.
Identify the rear defrost fuse using the fuse diagram on the cover.
Remove the fuse with a fuse puller and check for continuity using a multimeter.
If blown, replace it with a new fuse of the same amperage rating (typically 10A).

3. Check the Rear Window Defrost Grid

Inspect the rear window defrost grid for any visible breaks or damage.
If damage is found, prepare to repair. Clean the damaged area with glass cleaner.
Apply a rear defrost repair kit according to the manufacturer's instructions to restore conductivity.

4. Test the Switch and Wiring

Reconnect the battery terminal.
Turn on the ignition and activate the rear defrost switch.
Use a multimeter to check for voltage at the rear defrost connector. If no voltage is detected, further inspect the switch and wiring for faults.
Repair or replace faulty components as necessary.

5. Final Assembly

Reassemble any components removed during the inspection.
Ensure all connections are secure and the wiring harness is properly routed.
Reinstall the fuse if it was removed for testing.