my Toyota Highlander Third Generation (2014-2019) won't unlock remotely, what's the fix?

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

543 words

Problem Statement

Learn how to diagnose and fix the remote unlocking issue in a 2014-2019 Toyota Highlander. Step-by-step guide with tools and procedures included.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle battery before working on electrical systems to avoid short circuits

Symptoms

•Key fob buttons do not respond when pressed
•Vehicle doors remain locked despite attempts to unlock
•Indicators on the key fob do not illuminate when buttons are pressed
•Manual unlock using the key is still operational
•Other functions of the key fob (like locking) may also be affected

Diagnostic Steps

1
Check the battery of the key fob for charge and proper installation
2
Inspect the key fob for physical damage or corrosion on the contacts
3
Test the key fob functionality using a spare key fob, if available
4
Scan the vehicle's body control module for any stored error codes using an OBD-II scanner
5
Verify the vehicle's remote keyless entry system fuses for continuity
6
Check the door lock actuators for functionality with the vehicle’s internal switch

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
•New CR2032 battery
•Fuse puller or needle-nose pliers
•OBD-II scanner
•Multimeter
•Basic hand tools for door panel removal

Parts Required

•CR2032 battery
•Replacement door lock actuator (if needed)
•Replacement fuse (if needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the battery of the key fob for charge and proper installation
2
Inspect the key fob for physical damage or corrosion on the contacts
3
Test the key fob functionality using a spare key fob, if available
4
Scan the vehicle's body control module for any stored error codes using an OBD-II scanner
5
Verify the vehicle's remote keyless entry system fuses for continuity
6
Check the door lock actuators for functionality with the vehicle’s internal switch

Solution

1. Key Fob Battery Replacement

Tools Required: Small flathead screwdriver, new CR2032 battery.
Open the key fob using a small flathead screwdriver.
Remove the old battery and insert the new CR2032 battery, ensuring correct polarity.
Snap the key fob back together securely.

2. Inspect and Replace Fuses

Tools Required: Fuse puller or needle-nose pliers.
Locate the fuse box, typically found under the dashboard or in the engine compartment.
Identify the fuse related to the door locks (refer to the owner’s manual for the exact fuse location).
Remove the fuse and inspect it for continuity; replace if blown (use the same amperage rating).
Reinstall the fuse and close the fuse box.

3. Body Control Module Reset

Tools Required: OBD-II scanner.
Connect the OBD-II scanner to the vehicle's diagnostic port.
Follow the scanner’s instructions to clear any error codes related to the remote keyless entry system.
Disconnect the scanner and test the key fob functionality again.

4. Door Lock Actuator Testing

Tools Required: Multimeter, basic hand tools.
Remove the door panel to access the door lock actuator.
Use a multimeter to test the actuator for proper voltage when the unlock button is pressed.
If no voltage is detected, inspect wiring connections; if voltage is present but the actuator does not respond, replace the actuator.