my Toyota Highlander Third Generation (2014-2019) power locks don’t work what should I check

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

517 words

Problem Statement

Learn how to diagnose and fix non-functional power locks in a 2014-2019 Toyota Highlander. Step-by-step guide with diagnostic procedures 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 components to prevent short circuits.

Symptoms

•Power door locks do not respond to the key fob.
•Power door locks do not respond to the interior lock switch.
•The key fob does not illuminate when buttons are pressed.
•No clicking sound when attempting to lock/unlock doors.
•Battery warning light illuminated on the dashboard.

Diagnostic Steps

1
Check the battery charge of the key fob and replace if necessary.
2
Inspect the vehicle battery for proper voltage and connections.
3
Use an OBD-II scanner to check for any relevant trouble codes.
4
Inspect the fuses related to the power lock system in the fuse box.
5
Test the door lock actuators for operation using a multimeter.
6
Examine the wiring harnesses for any visible damage or disconnections.

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
•Socket set
•Trim removal tools
•Fuse puller or needle-nose pliers
•Small flathead screwdriver

Parts Required

•Key fob battery (CR2032)
•Replacement fuse (if necessary)
•Door lock actuator (if faulty)

Related Faults

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Diagnostic Steps

1
Check the battery charge of the key fob and replace if necessary.
2
Inspect the vehicle battery for proper voltage and connections.
3
Use an OBD-II scanner to check for any relevant trouble codes.
4
Inspect the fuses related to the power lock system in the fuse box.
5
Test the door lock actuators for operation using a multimeter.
6
Examine the wiring harnesses for any visible damage or disconnections.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver, replacement battery (CR2032).
Open the key fob using the flathead screwdriver.
Remove the old battery and insert the new one, ensuring correct polarity.
Reassemble the key fob and test its functionality.

3. Inspect and Replace Fuses

Tools Required: Fuse puller or needle-nose pliers.
Locate the fuse box (typically under the dashboard or in the engine compartment).
Identify the fuse related to the power locks (refer to the fuse diagram).
Remove the fuse and inspect it for continuity; replace if blown.

4. Repair or Replace Door Lock Actuators

Tools Required: Socket set, trim removal tools, multimeter.
Remove the door panel to access the door lock actuator.
Visually inspect the actuator and its wiring for damage.
Use a multimeter to test the actuator for proper voltage when the lock switch is activated.
If the actuator is faulty, disconnect it and replace it with a new one, ensuring proper connections.

5. Reassemble and Test

Reattach the door panel securely, ensuring all clips are in place.
Reconnect the vehicle battery.
Test the power locks using the key fob and the interior switch.