how to troubleshoot the key fob not working for my Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

504 words

Problem Statement

Learn how to troubleshoot and fix a non-working key fob for Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic steps and solutions.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle battery before working on the key fob electronics to prevent accidental short circuits.

Symptoms

•Key fob buttons unresponsive
•Vehicle not recognizing the key fob
•Warning lights on the dashboard indicating a key fob issue
•Inability to start the engine with the key fob present
•Reduced range for remote functions (locking/unlocking)

Diagnostic Steps

1
Check the battery level of the key fob using a multimeter or by replacing it with a new battery.
2
Inspect the key fob for physical damage or signs of wear and tear.
3
Verify that the vehicle’s battery is fully charged and in good condition.
4
Attempt to reprogram the key fob following the manufacturer’s instructions.
5
Scan the vehicle’s OBD-II system for any error codes related to the keyless entry system.
6
Check for interference from other electronic devices or nearby key fobs.

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

•Multimeter
•Small flathead screwdriver

Parts Required

•Replacement key fob battery (CR2032)

Related Faults

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Diagnostic Steps

1
Check the battery level of the key fob using a multimeter or by replacing it with a new battery.
2
Inspect the key fob for physical damage or signs of wear and tear.
3
Verify that the vehicle’s battery is fully charged and in good condition.
4
Attempt to reprogram the key fob following the manufacturer’s instructions.
5
Scan the vehicle’s OBD-II system for any error codes related to the keyless entry system.
6
Check for interference from other electronic devices or nearby key fobs.

Solution

1. Preparation

Gather all necessary tools and components.
Ensure the vehicle is parked in a safe area with a flat surface.
Disconnect the vehicle battery if you will be working on the key fob electronics.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver, replacement battery (CR2032).
Use the flathead screwdriver to gently pry open the key fob casing.
Remove the old battery and insert the new battery, ensuring the positive side is facing up.
Snap the key fob casing back together securely.

3. Reprogram Key Fob

Tools Required: None.
Sit inside the vehicle with all doors closed.
Insert the key into the ignition and turn it to the "On" position (do not start the engine) and back to "Off" five times within 10 seconds.
Listen for a confirmation sound indicating the vehicle is in programming mode.
Press any button on the key fob to complete the programming process.
Turn the ignition to "Off" and then remove the key.

4. Check for Interference

Tools Required: None.
Move away from any other electronic devices or key fobs to ensure they are not causing interference.
Try using the key fob again to see if it functions properly.