how to fix a broken key fob in my Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

30 minutes - 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

464 words

Problem Statement

Learn how to diagnose and fix a broken 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 - 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is off before working on the key fob.

Symptoms

•Key fob buttons unresponsive
•Key fob not detected by the vehicle
•Battery warning light illuminated on the dashboard
•Inconsistent operation (works sometimes, not others)
•Physical damage to the key fob casing

Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Open the key fob and check the battery condition; replace if needed.
3
Use an OBD-II scanner to check for any related error codes in the vehicle.
4
Test the key fob's signal using a multimeter to ensure it is transmitting.
5
Verify that the vehicle’s keyless entry system is functioning properly by testing with a spare key fob if available.

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

•Small screwdriver set
•Multimeter

Parts Required

•Replacement battery (CR2032)
•Key fob casing (if damaged)

Related Faults

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Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Open the key fob and check the battery condition; replace if needed.
3
Use an OBD-II scanner to check for any related error codes in the vehicle.
4
Test the key fob's signal using a multimeter to ensure it is transmitting.
5
Verify that the vehicle’s keyless entry system is functioning properly by testing with a spare key fob if available.

Solution

1. Preparation

Gather necessary tools and parts.
Tools Required: Small screwdriver set, multimeter, replacement battery (CR2032), key fob case (if damaged).
Safety Warnings: Ensure the vehicle is off before working on the key fob.

2. Disassemble the Key Fob

Use a small screwdriver to carefully pry open the key fob casing.
Take note of the orientation of the components as you remove them for easy reassembly.

3. Replace the Battery

Carefully remove the old battery from the key fob.
Insert the new CR2032 battery, ensuring the positive (+) side is facing the correct direction.

4. Test the Key Fob

Before reassembling, use a multimeter to ensure the new battery is functioning properly and that the key fob is transmitting a signal.
Press the buttons to verify that the multimeter indicates output.

5. Reassemble the Key Fob

Carefully snap the key fob casing back together, ensuring all components are securely in place.
Test the key fob by pressing the buttons to confirm that it is functioning properly before final use.