how to fix my Toyota Highlander Third Generation (2014-2019) power locks that won’t unlock?

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

579 words

Problem Statement

Learn how to diagnose and fix power locks that won't unlock in your Toyota Highlander (2014-2019). Step-by-step guide with tools and tips.

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.

Symptoms

•Power door locks are unresponsive when using the remote or door switch
•Alarm system may not engage or disengage properly
•Lock indicator lights on the dashboard are not illuminating
•Manual unlocking of doors is required to access the vehicle
•Potentially dead battery in the remote key fob

Diagnostic Steps

1
Check the battery condition of the key fob and replace if necessary.
2
Attempt to unlock doors using the physical key to determine if it's a central locking issue.
3
Inspect the fuse related to the power door locks in the fuse box for any signs of damage or failure.
4
Use an OBD-II scanner to check for any error codes related to the body control module (BCM).
5
Verify the wiring and connectors leading to the door lock actuators for signs of wear or disconnection.
6
Test the door lock actuators individually for functionality.

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

•Socket set
•Flat-head screwdriver
•Multi-meter
•Fuse puller

Parts Required

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

Related Faults

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Diagnostic Steps

1
Check the battery condition of the key fob and replace if necessary.
2
Attempt to unlock doors using the physical key to determine if it's a central locking issue.
3
Inspect the fuse related to the power door locks in the fuse box for any signs of damage or failure.
4
Use an OBD-II scanner to check for any error codes related to the body control module (BCM).
5
Verify the wiring and connectors leading to the door lock actuators for signs of wear or disconnection.
6
Test the door lock actuators individually for functionality.

Solution

1. Preparation

Gather tools: Socket set, flat-head screwdriver, multi-meter, and replacement fuses if necessary.
Ensure the vehicle is parked on a level surface and the ignition is off.

2. Inspect and Replace Fuses

Sub-steps:
1. Locate the fuse box. It is typically located under the dashboard near the driver's side or in the engine compartment.
2. Remove the fuse cover and identify the power door lock fuse by consulting the diagram on the cover or the owner's manual.
3. Use a fuse puller or pliers to remove the fuse and inspect it for continuity.
4. If the fuse is blown, replace it with a new fuse of the same amperage rating.

3. Check Key Fob Battery

Sub-steps:
1. Remove the key fob cover using a flat-head screwdriver.
2. Take out the old battery and replace it with a new one, ensuring proper polarity.
3. Reassemble the key fob and test the lock and unlock functions.

4. Inspect Wiring and Connectors

Sub-steps:
1. Remove the door panel using a socket set to access the internal wiring.
2. Check the wiring harness and connectors for any signs of damage or corrosion.
3. Ensure all connections are secure. Repair or replace any damaged wiring as needed.

5. Replace Door Lock Actuator (if necessary)

Sub-steps:
1. If the actuator is determined to be faulty, disconnect the wiring harness.
2. Remove the screws securing the actuator in place and carefully take it out.
3. Install the new actuator in the reverse order of removal, ensuring it is securely fastened and connected.