How can I fix the malfunctioning keyless entry system on my Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

619 words

Problem Statement

Learn how to diagnose and repair the malfunctioning keyless entry system on your 2020-present Toyota Highlander with step-by-step instructions.

Affected Component

keyless entry system

Estimated Time

2-4 hours

Symptoms

•Key fob not unlocking/locking doors
•No response from the vehicle
•Indicator lights malfunction
•Intermittent issues

Diagnostic Steps

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
•OBD-II Scanner
•Flathead & Phillips Screwdrivers
•Key Fob Battery (CR2032)
•Soldering Iron (if needed for repairs)
•T10 Torx Driver (for certain fasteners)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Solution

Tools Required

Multimeter
OBD-II Scanner
Flathead & Phillips Screwdrivers
Key Fob Battery (CR2032)
Soldering Iron (if needed for repairs)
T10 Torx Driver (for certain fasteners)

Repair Instructions

Replace Key Fob Battery
- Open the key fob using a flathead screwdriver.
- Remove the old battery and install a new CR2032 battery.
- Reassemble the fob and test its functionality.
Reprogram Key Fob (if necessary)
- Enter the vehicle and close all doors.
- Insert the key into the ignition and turn it to the "ON" position (do not start).
- Turn the key to "OFF" and remove it.
- Press and hold the "LOCK" button on the fob for about 1 second.
- Repeat this step for all fobs you want to program.
- Turn the ignition back to "ON" to complete the process.
Inspect and Repair Wiring
- If you find damaged wiring, carefully repair it using solder and heat shrink tubing or electrical tape.
- Ensure all connections are secure and insulated.
Check Door Lock Actuators
- If the actuators are faulty, you will need to replace them.
- Remove the door panel using the appropriate screwdrivers and Torx driver.
- Disconnect the electrical connector from the actuator.
- Remove the actuator from the door and install the new one.
- Reconnect the electrical connector and reassemble the door panel.
Reset the Vehicle System
- If DTCs were present, clear them using the OBD-II scanner after repairs.
- Start the vehicle and test the keyless entry system again.
Test the System
- After completing all repairs, test the keyless entry system by walking away from the vehicle and approaching with the key fob to check if the doors unlock automatically.

Conclusion

By following these detailed steps, you should be able to diagnose and fix the malfunctioning keyless entry system on your 2020-present Toyota Highlander. If issues persist after troubleshooting, consider seeking assistance from a certified Toyota technician, as there may be deeper electronic issues at play.