how to fix the power locks not working in Toyota Highlander Third Generation (2014-2019)?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

597 words

Problem Statement

Learn how to diagnose and fix power locks not working in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shorts or shocks.
•Allow the vehicle to cool down before working on components to avoid burns.

Symptoms

•Power lock switch does not respond when pressed
•Doors do not lock or unlock using the key fob
•Doors remain locked or unlocked regardless of switch input
•Possible audible clicking sound from the door lock actuator
•Inoperative trunk release via the key fob or interior switch

Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner for any trouble codes related to the central locking system.
2
Check the fuse for the power locks in the fuse box, ensuring it is not blown.
3
Inspect the power lock switch for physical damage or disconnection.
4
Test the key fob battery and functionality by attempting to reprogram it.
5
Remove the door panel and visually inspect the door lock actuator and wiring for damage or corrosion.

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

•OBD-II scanner
•Multimeter
•Phillips screwdriver
•Flathead screwdriver
•Socket set
•Trim removal tool

Parts Required

•Power lock switch (if faulty)
•Door lock actuator (if faulty)
•Fuses (as needed)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner for any trouble codes related to the central locking system.
2
Check the fuse for the power locks in the fuse box, ensuring it is not blown.
3
Inspect the power lock switch for physical damage or disconnection.
4
Test the key fob battery and functionality by attempting to reprogram it.
5
Remove the door panel and visually inspect the door lock actuator and wiring for damage or corrosion.

Solution

1. Preparation

Gather tools: Phillips screwdriver, flathead screwdriver, socket set, multimeter, and trim removal tool.
Ensure the vehicle is parked and the ignition is turned off. Disconnect the battery for safety.

2. Check and Replace Fuse

Locate the fuse box, typically found under the dashboard or in the engine compartment.
Identify the fuse associated with the power locks using the diagram on the fuse box cover.
Use a multimeter to check if the fuse is operational. If blown, replace it with a fuse of the same amperage.

3. Inspect and Replace Power Lock Switch

Remove the door panel using a trim removal tool, taking care not to damage clips.
Disconnect the power lock switch connector and test with a multimeter for continuity.
If the switch fails the continuity test, replace it with a new switch and reconnect.

4. Examine and Replace Door Lock Actuator

With the door panel removed, inspect the door lock actuator for signs of wear or failure.
Disconnect the actuator wiring harness and test with a multimeter for voltage.
If no voltage is present, trace the wiring back to the switch and check for breaks or shorts.
Remove the old actuator and install a new one, reconnecting the wiring harness.

5. Reassemble the Door Panel

Ensure all components are securely fastened and connected.
Align the door panel and press it back into place, ensuring all clips are seated properly.
Reconnect the battery and test the power locks.