how to fix my Toyota Corolla E170 (2013-2019) that won’t unlock with the key fob

Toyota Corolla E170 (2013-2019)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

550 words

Problem Statement

Learn how to fix the key fob not unlocking your Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic steps and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Be cautious when using small tools to avoid injury.
•Handle the key fob components carefully to avoid damage.

Symptoms

•Key fob buttons do not respond when pressed
•Vehicle does not unlock remotely
•Indicator light on key fob does not illuminate
•Manual key entry may be required
•Possible intermittent unlocking issues

Diagnostic Steps

1
Check the key fob battery by opening it and measuring voltage with a multimeter.
2
Inspect the key fob for physical damage or corrosion on the battery contacts.
3
Verify that the vehicle’s door lock actuators are functioning by attempting to unlock the doors manually.
4
Test the key fob signal using an OBD-II scanner or key fob tester to confirm it is transmitting.
5
Check for any blown fuses related to the central locking system in the fuse box.

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
•Multimeter
•Key fob tester (optional)

Parts Required

•CR2032 key fob battery

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Diagnostic Steps

1
Check the key fob battery by opening it and measuring voltage with a multimeter.
2
Inspect the key fob for physical damage or corrosion on the battery contacts.
3
Verify that the vehicle’s door lock actuators are functioning by attempting to unlock the doors manually.
4
Test the key fob signal using an OBD-II scanner or key fob tester to confirm it is transmitting.
5
Check for any blown fuses related to the central locking system in the fuse box.

Solution

1. Preparation

Gather tools: small screwdriver, multimeter, replacement battery (CR2032), and any necessary cleaning supplies.
Ensure you are in a clean workspace to prevent losing small components.

2. Replace Key Fob Battery

Step 1: Open the key fob using a small screwdriver to carefully pry apart the two halves.
Step 2: Remove the old battery from the key fob, noting the orientation (+/-).
Step 3: Insert the new battery (CR2032) in the same orientation as the old battery.
Step 4: Snap the key fob halves back together securely.

3. Test Key Fob Functionality

Step 1: Stand within range of the vehicle, ideally within 3-5 feet.
Step 2: Press the unlock button on the key fob to check if the vehicle responds.
Step 3: If the vehicle unlocks, the issue is resolved; if not, proceed to the next steps.

4. Check for Physical Damage

Step 1: Inspect the key fob for cracks or water damage.
Step 2: If damage is found, consider replacing the key fob or repairing it with a key fob repair kit.

5. Reprogram the Key Fob (if necessary)

Step 1: Sit in the vehicle with all doors closed and locked.
Step 2: Insert the key into the ignition and turn it to the "ON" position without starting the engine.
Step 3: Press and hold the “Lock” button on the key fob for about 5 seconds.
Step 4: Turn the ignition off and test the key fob again.