my Toyota Highlander Third Generation (2014-2019) power locks won't work, what should I check?

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

529 words

Problem Statement

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

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Power door locks do not respond when pressing the lock/unlock buttons.
•Door locks may occasionally work intermittently.
•Key fob does not lock or unlock the doors.
•Manual locking and unlocking of doors may still function.
•Check engine light may be illuminated due to related electrical issues.

Diagnostic Steps

1
Check the vehicle's battery voltage to ensure it is within the proper range (12.4V - 12.7V).
2
Inspect the key fob battery and replace if necessary.
3
Use an OBD-II scanner to check for any error codes related to the power lock system.
4
Examine the wiring and connectors in the driver’s door for signs of damage or corrosion.
5
Test the power lock actuator for functionality using a multimeter.
6
Check the vehicle's fuse box for any blown fuses related to the power lock system.

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
•Small flathead screwdriver

Parts Required

•Key fob battery (CR2032)
•Fuse (if applicable)
•Power lock actuator (if found faulty)

Related Faults

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Symptoms

•Power door locks do not respond when pressing the lock/unlock buttons.

•Door locks may occasionally work intermittently.

•Key fob does not lock or unlock the doors.

•Manual locking and unlocking of doors may still function.

•Check engine light may be illuminated due to related electrical issues.

Diagnostic Steps

1
Check the vehicle's battery voltage to ensure it is within the proper range (12.4V - 12.7V).
2
Inspect the key fob battery and replace if necessary.
3
Use an OBD-II scanner to check for any error codes related to the power lock system.
4
Examine the wiring and connectors in the driver’s door for signs of damage or corrosion.
5
Test the power lock actuator for functionality using a multimeter.
6
Check the vehicle's fuse box for any blown fuses related to the power lock system.

Solution

1. Preparation

Gather necessary tools: OBD-II scanner, multimeter, socket set, and replacement fuses or actuators as needed.
Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Inspect and Replace Key Fob Battery

Remove the key fob cover using a small flathead screwdriver.
Replace the old battery with a new CR2032 or equivalent battery.
Reassemble the key fob and test the locking function.

3. Check and Replace Fuses

Locate the fuse box under the dashboard on the driver's side.
Identify the fuse related to the power locks (refer to the owner's manual for the exact fuse number).
Remove the old fuse and inspect it for continuity; replace if blown with the same amperage rating.
Reconnect the battery and test the power locks.

4. Repair or Replace Power Lock Actuator

Remove the door panel using a socket set to access the power lock actuator.
Disconnect the wiring harness from the actuator.
Test the actuator with a multimeter; if it does not pass, replace it with a new unit.
Reinstall the actuator and reconnect the wiring harness.
Reattach the door panel, ensuring all clips and screws are secured.

5. Final Assembly

Reconnect the battery.
Test the power locks using both the key fob and door controls.