How do I fix a malfunctioning keyless entry system in a 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

573 words

Problem Statement

Learn how to diagnose and repair a malfunctioning keyless entry system in your 2020 Toyota Highlander with our step-by-step guide.

Affected Component

keyless entry system

Estimated Time

2-3 hours

Symptoms

•Key Fob Not Responding
•Intermittent Functionality
•Warning Lights
•No Response from Vehicle

Diagnostic Steps

1
Check the Key Fob Battery
2
Test the Key Fob Signal
3
Inspect the Vehicle’s Antenna
4
Check the Vehicle’s Battery Condition
5
Inspect the Door Lock Mechanisms

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
•coin
•multimeter
•key fob tester
•screwdriver set

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Solution

Fixing a Malfunctioning Keyless Entry System in a 2020 Toyota Highlander

Repair Instructions

Key Fob Battery Replacement:
- Open the key fob as described in the diagnostic steps.
- Replace the old battery with a new CR2032 battery.
- Reassemble the fob and test its functionality.
Key Fob Reprogramming (if necessary):
- Symptoms: The fob works intermittently even after battery replacement.
- Tool Required: None (requires vehicle).
Step: Insert the key into the ignition, turn it to the "ON" position (do not start), and then back to "OFF" five times within 10 seconds. On the fifth turn to "ON," leave it in that position. Press any button on the fob to program it. Turn the ignition back to "OFF" to exit programming mode.
Replace the Keyless Entry Antenna (if faulty):
- Remove any panels necessary to access the antenna.
- Disconnect the old antenna and replace it with a new one. Ensure all connections are tight and secure.
Door Lock Actuator Repair/Replacement:
- If any door lock actuators are malfunctioning, replace them by removing the door panel.
- Disconnect the old actuator, connect the new one, and reassemble the door panel.
Battery Replacement:
- If the vehicle battery is low, replace it with a new one. Ensure connections are clean and tight.

Conclusion

After completing these steps, test the keyless entry system again. If issues persist, further diagnostic equipment may be needed, and it may be wise to consult with a professional technician for advanced troubleshooting.