how to fix my Toyota Corolla E170 (2013-2019) key fob not working

Toyota Corolla E170 (2013-2019)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

high

Severity

3 min read

502 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix a non-working key fob for Toyota Corolla E170 (2013-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle battery if working on electrical components to prevent short circuits.

Symptoms

•Key fob buttons do not respond
•Vehicle does not unlock or lock remotely
•Engine does not start with the key fob present
•Warning light on the dashboard indicating a key fob issue
•Reduced range of key fob operation

Diagnostic Steps

1
Replace the battery in the key fob to see if that resolves the issue.
2
Check for physical damage or water ingress in the key fob casing.
3
Test the key fob's signal using an OBD-II scanner or key fob tester.
4
Verify that the vehicle's receiver unit is functioning properly.
5
Reprogram the key fob using the vehicle's manual or a professional service.

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

•Flathead screwdriver
•Replacement battery (usually CR2032)
•OBD-II scanner (if testing signal)

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Replace the battery in the key fob to see if that resolves the issue.
2
Check for physical damage or water ingress in the key fob casing.
3
Test the key fob's signal using an OBD-II scanner or key fob tester.
4
Verify that the vehicle's receiver unit is functioning properly.
5
Reprogram the key fob using the vehicle's manual or a professional service.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is in a safe location and the battery is disconnected if needed.
Tools Required: Flathead screwdriver, replacement battery (usually CR2032), OBD-II scanner (if testing signal).

2. Replace Key Fob Battery

Open the key fob using a flathead screwdriver in the seam of the fob.
Carefully remove the old battery and replace it with a new CR2032 battery, ensuring the positive side is facing up.
Snap the fob casing back together securely.

3. Test Key Fob

Stand close to the vehicle and press any button on the key fob.
Check if the vehicle responds to the key fob commands (lock/unlock).
If the key fob still does not work, proceed to the next step.

4. Reprogram Key Fob (if necessary)

Enter the vehicle and close all doors.
Insert the key into the ignition and turn it to the "ON" position (but not starting the engine).
Turn the key back to "OFF" and remove it.
Repeat this process 5 times in quick succession (within 10 seconds) until the door locks cycle, indicating the vehicle is in programming mode.
Press any button on the key fob to program it. The locks will cycle again to confirm programming.
Turn the ignition to "OFF" to exit programming mode.