how to fix the keyless entry not working on my Toyota Highlander

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

520 words

Problem Statement

Learn how to diagnose and fix keyless entry issues in Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, 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 shocks or shorts.

Symptoms

•Key fob not responding when buttons are pressed
•Vehicle doors do not lock or unlock with the key fob
•Status LED on the key fob not illuminating
•Keyless entry system intermittent functioning
•Check keyless entry system warning message on the dashboard (if applicable)

Diagnostic Steps

1
Check the battery in the key fob for charge and proper installation.
2
Inspect the key fob for physical damage or wear.
3
Use an OBD-II scanner to check for any related error codes in the vehicle's computer system.
4
Verify the vehicle's battery voltage and connections for proper operation.
5
Test the keyless entry system with a spare key fob, if available.
6
Inspect the door lock actuators and wiring for damage.

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

•Screwdriver set
•Multimeter
•OBD-II scanner
•Trim removal tool

Parts Required

•Key fob battery (CR2032)
•Door lock actuator (if needed)

Related Faults

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Diagnostic Steps

1
Check the battery in the key fob for charge and proper installation.
2
Inspect the key fob for physical damage or wear.
3
Use an OBD-II scanner to check for any related error codes in the vehicle's computer system.
4
Verify the vehicle's battery voltage and connections for proper operation.
5
Test the keyless entry system with a spare key fob, if available.
6
Inspect the door lock actuators and wiring for damage.

Solution

1. Preparation

Gather tools: screwdriver set, multimeter, and OBD-II scanner.
Ensure the vehicle is turned off and parked safely.
Disconnect the vehicle battery to prevent electrical shorts during repairs.

2. Replace the Key Fob Battery

Sub-steps:
1. Open the key fob using a small flathead screwdriver to pry apart the casing.
2. Remove the old battery, noting its orientation.
3. Insert a new battery (commonly CR2032) in the same orientation as the old one.
4. Snap the key fob casing back together securely.

3. Reprogram the Key Fob (if necessary)

Sub-steps:
1. Insert the key into the ignition and turn it to the "ON" position without starting the engine.
2. Press and hold the lock button on the key fob for about 5 seconds.
3. Turn the ignition off and remove the key.
4. Test the key fob to see if the programming was successful.

4. Inspect and Repair Wiring/Components

Sub-steps:
1. Remove the interior door panel of the driver's side door using a screwdriver and trim removal tool.
2. Inspect the wiring harness connecting to the door lock actuator for any signs of damage or corrosion.
3. If damage is found, repair or replace the damaged wiring.
4. Test the door lock actuator using a multimeter to ensure it functions correctly; replace if faulty.