my Toyota Corolla E170 (2013-2019) won't unlock with the key fob what to do

Toyota Corolla E170 (2013-2019)

Error Codes

30 minutes - 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

495 words

Problem Statement

Learn how to diagnose and fix key fob issues for Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes - 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' and the ignition is off before working on electrical components.

Symptoms

•Key fob buttons do not respond
•Vehicle does not unlock when fob is pressed
•No sound or indicator light when pressing fob buttons
•Manual unlock works but key fob does not
•Check engine light illuminated

Diagnostic Steps

1
Check the battery in the key fob by opening it and inspecting for corrosion or leakage.
2
Replace the key fob battery with a new one and test the fob again.
3
Verify that the key fob is programmed correctly to the vehicle by attempting to unlock using a different fob.
4
Inspect the vehicle's receiver unit for any visible damage or disconnection.
5
Scan the vehicle for error codes using an OBD-II scanner to identify any 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

•Small flathead screwdriver
•OBD-II scanner

Parts Required

•Key fob battery (CR2032)

Related Faults

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Diagnostic Steps

1
Check the battery in the key fob by opening it and inspecting for corrosion or leakage.
2
Replace the key fob battery with a new one and test the fob again.
3
Verify that the key fob is programmed correctly to the vehicle by attempting to unlock using a different fob.
4
Inspect the vehicle's receiver unit for any visible damage or disconnection.
5
Scan the vehicle for error codes using an OBD-II scanner to identify any electrical issues.

Solution

1. Preparation

Gather tools: small flathead screwdriver, new key fob battery (typically CR2032), OBD-II scanner.
Ensure the vehicle is in a secure location and that all doors are closed.

2. Replace Key Fob Battery

Use the small flathead screwdriver to gently pry open the key fob casing.
Remove the old battery, noting the orientation (positive side facing up).
Insert the new battery in the same orientation as the old one.
Snap the key fob casing back together securely.

3. Reprogram Key Fob (if necessary)

Sit in the driver's seat and close all doors.
Insert the key into the ignition and turn it to the "On" position without starting the engine.
Press the "Lock" button on the key fob and then turn the key to the "Off" position.
Repeat the process two more times (for a total of three cycles) and then turn the key to "On" again.
Press the "Lock" button on the fob again to complete the programming sequence.

4. Inspect Vehicle Receiver Unit

Open the vehicle's hood and locate the receiver unit, typically near the steering column or fuse box.
Check for loose connections or damaged wiring.
If necessary, reconnect or replace the receiver unit.