my Toyota Highlander’s keyless entry system stopped working how can I fix it

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

448 words

Problem Statement

Learn how to diagnose and fix the keyless entry system in your Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shocks or shorts.

Symptoms

•Key fob buttons not responding
•No response from the vehicle when pressing the key fob
•Interior lights not activating when the key fob is near
•Check keyless entry system warning light illuminated
•Manual entry requires using the physical key

Diagnostic Steps

1
Check the key fob battery by opening the fob and inspecting or replacing it.
2
Test the key fob signal with an OBD-II scanner or key fob tester if available.
3
Verify that the vehicle's battery is charged and in good condition.
4
Inspect the keyless entry antenna for damage or disconnection.
5
Perform a system reset by disconnecting the vehicle's battery for a few minutes and reconnecting it.

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
•New battery (usually CR2032)
•Screwdriver set
•Multimeter
•OBD-II scanner

Parts Required

•Key fob battery (CR2032 or as specified)
•Keyless entry antenna (if needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the key fob battery by opening the fob and inspecting or replacing it.
2
Test the key fob signal with an OBD-II scanner or key fob tester if available.
3
Verify that the vehicle's battery is charged and in good condition.
4
Inspect the keyless entry antenna for damage or disconnection.
5
Perform a system reset by disconnecting the vehicle's battery for a few minutes and reconnecting it.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked and secure.
Disconnect the vehicle battery using a wrench to avoid any electrical shorts.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver, new battery (usually CR2032).
Open the key fob using the screwdriver to gently pry it apart.
Remove the old battery and insert the new battery, ensuring correct polarity.
Reassemble the key fob and test functionality.

3. Inspect Keyless Entry Antenna

Tools Required: Screwdriver set, multimeter.
Locate the antenna, typically found in the door panel or roof.
Remove any cover panels to access the antenna.
Using a multimeter, check for continuity in the antenna wiring.
If damaged, replace the antenna with a new one.

4. Reset the System

Reconnect the vehicle battery.
Turn on the ignition without starting the engine, and then turn it off.
Press the lock and unlock buttons on the key fob to re-sync it with the vehicle.