how to fix the rear defroster not working on my Toyota Corolla E170 (2013-2019)?

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

528 words

Problem Statement

Learn how to diagnose and fix the rear defroster not working on your 2013-2019 Toyota Corolla E170. Step-by-step guide with symptoms 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 short circuits or shocks.

Symptoms

•Rear defroster switch does not illuminate when activated
•Lack of heat on the rear windshield
•No visible defrosting of rear glass
•Possible blown fuse related to the defroster system
•Warning light on the dashboard (if applicable)

Diagnostic Steps

1
Check the rear defroster switch for illumination when pressed.
2
Inspect the rear defroster fuse in the fuse box for continuity.
3
Visually inspect the rear defroster grid on the windshield for damage or breaks.
4
Use a multimeter to check voltage at the defroster connector when activated.
5
Verify that the vehicle's battery is fully charged, as low voltage can affect electrical components.

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 or pliers
•Defroster repair kit (if necessary)
•Screwdriver set

Parts Required

•Rear defroster fuse (if blown)
•Defroster repair kit (if grid lines are damaged)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the rear defroster switch for illumination when pressed.
2
Inspect the rear defroster fuse in the fuse box for continuity.
3
Visually inspect the rear defroster grid on the windshield for damage or breaks.
4
Use a multimeter to check voltage at the defroster connector when activated.
5
Verify that the vehicle's battery is fully charged, as low voltage can affect electrical components.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle battery to ensure safety during electrical work.

2. Inspect the Rear Defroster Fuse

Locate the fuse box (typically under the dashboard or in the engine compartment).
Identify the fuse for the rear defroster (consult the owner's manual for the exact location).
Remove the fuse using a fuse puller or pliers.
Check the fuse for continuity using a multimeter. If blown, replace it with a fuse of the same amperage.

3. Inspect the Rear Defroster Grid

Examine the rear windshield for any visible cracks or damage to the defroster lines.
If any lines are broken, use a defroster repair kit to fix the damaged sections.
Clean the area around the defroster grid to ensure a good electrical connection.

4. Test the Defroster Connector

Locate the electrical connector for the rear defroster.
Reconnect the battery and turn on the ignition.
Activate the rear defroster switch.
Use a multimeter to check for voltage at the connector. If voltage is present but the defroster is still not working, the grid may be faulty.

5. Reassemble and Finalize

If all tests pass but the defroster is still not operational, consider replacing the rear defroster relay (if applicable).
Reinstall any panels removed for access.
Reconnect the battery and perform a final test of the rear defroster.