how to fix the rear defrost in Toyota Corolla E170 (2013-2019) not working

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 defrost not working in Toyota Corolla E170 (2013-2019). Step-by-step guide with symptoms, tools, 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 components to prevent shock or short circuits.

Symptoms

•Rear defroster switch does not illuminate when activated
•Rear windshield remains foggy or icy
•No audible click or sound when the rear defrost is engaged
•Possible blown fuse related to the rear defrost circuit
•Check engine light may be illuminated (if related to electrical issues)

Diagnostic Steps

1
Inspect the rear defrost switch for signs of damage or malfunction.
2
Check the vehicle's fuse box for a blown fuse linked to the rear defrost system.
3
Use a multimeter to test the voltage at the rear defroster connector.
4
Verify the operation of the rear defroster grid visually for any breaks or damage.
5
Check for any fault codes using an OBD-II scanner that might indicate 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

•Multimeter
•Fuse puller or needle-nose pliers
•Trim removal tool

Parts Required

•New rear defrost switch (if faulty)
•Replacement fuse (if blown)
•Rear defroster grid repair kit (if needed)

Related Faults

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Diagnostic Steps

1
Inspect the rear defrost switch for signs of damage or malfunction.
2
Check the vehicle's fuse box for a blown fuse linked to the rear defrost system.
3
Use a multimeter to test the voltage at the rear defroster connector.
4
Verify the operation of the rear defroster grid visually for any breaks or damage.
5
Check for any fault codes using an OBD-II scanner that might indicate electrical issues.

Solution

1. Preparation

Gather tools and parts needed.
Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Fuse

Tools Required: Fuse puller or needle-nose pliers
Locate the fuse box, usually found under the dashboard on the driver’s side.
Identify the fuse related to the rear defrost using the fuse diagram.
Remove the fuse and inspect it; if the metal strip is broken, replace it with a new fuse of the same amperage (typically 15A).

3. Test and Replace Rear Defrost Switch

Tools Required: Multimeter
Remove the switch panel using a trim removal tool.
Disconnect the electrical connector from the rear defrost switch.
Use a multimeter to check for continuity across the switch terminals when pressed.
If there is no continuity, replace the rear defrost switch with a new one.

4. Inspect and Repair Rear Defroster Grid

Tools Required: Multimeter, repair kit (if necessary)
Inspect the rear defroster grid for any visible breaks or damage.
If breaks are found, use a defroster grid repair kit to restore the conductivity.
Follow the manufacturer's instructions for applying the repair solution.

5. Reassemble and Test

Reconnect all electrical connectors and reassemble any panels removed during the repair.
Reconnect the battery and test the rear defroster by activating the switch.