why does my Toyota Corolla E170 (2013-2019) key fob not work after changing the battery

Toyota Corolla E170 (2013-2019)

Error Codes

30 minutes

Time

medium

Difficulty

medium

Severity

3 min read

521 words

Problem Statement

Learn how to troubleshoot and fix a non-working key fob after battery replacement for Toyota Corolla E170 (2013-2019). Step-by-step guide included.

Affected Component

Electrical

Estimated Time

30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Handle the key fob carefully to avoid damaging internal components.

Symptoms

•Key fob buttons do not respond
•Warning light on the dashboard indicating key fob issue
•Inability to unlock or lock doors remotely
•Engine will not start using the key fob
•LED light on the key fob does not illuminate when buttons are pressed

Diagnostic Steps

1
Check the battery orientation in the key fob to ensure it is installed correctly.
2
Test the new battery with a multimeter to confirm it has sufficient voltage.
3
Inspect the key fob for any physical damage or corrosion on the contacts.
4
Reprogram the key fob using the vehicle's onboard programming procedure.
5
Test the fob's signal with an OBD-II scanner to check for communication 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

•Flathead screwdriver
•Multimeter
•OBD-II scanner (if applicable)

Parts Required

•Replacement key fob battery (CR2032 or as specified)

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Diagnostic Steps

1
Check the battery orientation in the key fob to ensure it is installed correctly.
2
Test the new battery with a multimeter to confirm it has sufficient voltage.
3
Inspect the key fob for any physical damage or corrosion on the contacts.
4
Reprogram the key fob using the vehicle's onboard programming procedure.
5
Test the fob's signal with an OBD-II scanner to check for communication issues.

Solution

1. Preparation

Tools Required: Flathead screwdriver, multimeter, OBD-II scanner (if applicable).
Ensure the vehicle is in a secure location and the ignition is off.
Gather necessary tools and replacement parts.

2. Verify Battery Installation

Use a flathead screwdriver to gently open the key fob casing.
Remove the old battery and insert the new battery, ensuring the positive side (+) is facing the correct direction.
Close the key fob casing securely.

3. Test Battery Voltage

Use a multimeter to measure the voltage of the new battery.
Ensure the voltage is above 3V for most key fob batteries. If it’s lower, replace the battery again.

4. Inspect Key Fob

Check for any visible damage to the key fob casing or internal components.
Examine the battery contacts for corrosion; clean if necessary using rubbing alcohol and a soft cloth.

5. Reprogram Key Fob

Enter the vehicle and close all doors.
Insert the key into the ignition and turn it to the "ON" position (do not start the engine).
Cycle the ignition from "ON" to "OFF" five times within 10 seconds. Leave the key in the "ON" position on the fifth cycle.
Press and hold the "LOCK" button on the key fob for about 5 seconds. This should program the key fob.
Turn the ignition to "OFF" to complete the programming process.