my Toyota Highlander Third Generation (2014-2019) key fob won't unlock the doors, what’s wrong?

Toyota Highlander Third Generation (2014-2019)

Error Codes

30 minutes

Time

easy

Difficulty

medium

Severity

3 min read

459 words

Problem Statement

Learn how to diagnose and fix a non-functioning key fob for Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in a secure location; avoid working near water or moisture.
•Ensure the vehicle is turned off and in a secure location before working on the key fob.

Symptoms

•Key fob buttons unresponsive
•Vehicle doors do not unlock when pressing the key fob
•Indicator light on key fob does not illuminate when pressed
•Manual door lock operation works fine
•Battery warning light may appear on the dashboard

Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Check the battery of the key fob using a multimeter to ensure it has sufficient voltage.
3
Replace the battery in the key fob and test functionality.
4
Verify the vehicle's central locking system by using the physical key to unlock the doors.
5
Scan the vehicle for any trouble codes related to the keyless entry system using an OBD-II scanner.

Solution

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

•Flathead screwdriver
•Multimeter

Parts Required

•Replacement battery (CR2032 or as specified)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Check the battery of the key fob using a multimeter to ensure it has sufficient voltage.
3
Replace the battery in the key fob and test functionality.
4
Verify the vehicle's central locking system by using the physical key to unlock the doors.
5
Scan the vehicle for any trouble codes related to the keyless entry system using an OBD-II scanner.

Solution

1. Preparation

Tools Required: Flathead screwdriver, replacement battery (CR2032 or as specified in the user manual).
Safety Warnings: Ensure the vehicle is in a secure location; avoid working near water or moisture.

2. Open the Key Fob

Use a flathead screwdriver to carefully pry open the key fob casing along the seam.
Take care not to damage the casing or internal components while opening.

3. Replace the Battery

Remove the old battery from the key fob.
Insert the new battery, ensuring that the positive (+) side is facing the correct direction as indicated within the key fob.
Ensure the battery is seated properly and making good contact.

4. Reassemble the Key Fob

Align the two halves of the key fob casing.
Press the two halves together firmly until they click back into place.

5. Test the Key Fob

Stand near the vehicle and press the unlock button on the key fob to check functionality.
If the doors unlock, the repair is successful.