my Toyota Corolla E170 (2013-2019) won't unlock with the remote, what's wrong?

Toyota Corolla E170 (2013-2019)

Error Codes

30 minutes - 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

472 words

Problem Statement

Learn how to diagnose and fix the key fob not unlocking your 2013-2019 Toyota Corolla E170. 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 a secure location and cannot roll while working on the electronic systems.

Symptoms

•Remote key fob not responding to unlock command
•LED indicator on the key fob not lighting up
•Manual key entry required to unlock the vehicle
•Potential battery warning light on the dashboard
•Inconsistent locking/unlocking behavior when using the key fob

Diagnostic Steps

1
Inspect the key fob for physical damage or signs of wear.
2
Replace the battery in the key fob with a new one.
3
Test the key fob's signal using a multimeter to check for output voltage.
4
Verify the vehicle's central locking system by attempting to unlock using the physical key.
5
Check for error codes using an OBD-II scanner to identify any potential issues with the vehicle's electronics.
6
Inspect the door lock actuator and wiring for faults.

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

•Screwdriver set
•Multimeter

Parts Required

•Key fob battery (CR2032)

Related Faults

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Diagnostic Steps

1
Inspect the key fob for physical damage or signs of wear.
2
Replace the battery in the key fob with a new one.
3
Test the key fob's signal using a multimeter to check for output voltage.
4
Verify the vehicle's central locking system by attempting to unlock using the physical key.
5
Check for error codes using an OBD-II scanner to identify any potential issues with the vehicle's electronics.
6
Inspect the door lock actuator and wiring for faults.

Solution

1. Preparation

Gather tools: screwdriver set, multimeter, and new key fob battery (typically CR2032).
Ensure the vehicle is parked safely and the ignition is off.

2. Replace Key Fob Battery

Sub-steps:
1. Open the key fob using a small flathead screwdriver by gently prying apart the two halves.
2. Carefully remove the old battery, noting the orientation of the positive (+) and negative (-) sides.
3. Insert the new battery in the same orientation as the old one.
4. Snap the key fob halves back together until secured.

3. Test Key Fob Functionality

Sub-steps:
1. Stand near the vehicle and press the unlock button on the key fob.
2. Observe if the vehicle responds by unlocking the doors.
3. If issues persist, proceed to test the signal with a multimeter, checking for voltage output when buttons are pressed.

4. Inspect Door Lock Actuator (if necessary)

Sub-steps:
1. Remove the door panel to access the door lock actuator.
2. Inspect the wiring harness for any damage or corrosion.
3. Test the actuator using a multimeter for continuity; replace if faulty.