my Toyota Highlander Third Generation (2014-2019) won't unlock with the remote what should I do

Toyota Highlander Third Generation (2014-2019)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

497 words

Problem Statement

Learn how to troubleshoot and fix the key fob not unlocking your 2014-2019 Toyota Highlander. Step-by-step diagnostic and repair instructions included.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in a safe location before performing any repairs.

Symptoms

•Remote key fob not responding
•No sound or light indication from the key fob
•Manual unlocking not working (if applicable)
•Battery warning light on the dashboard (if equipped)
•Inconsistent remote operation (works intermittently)

Diagnostic Steps

1
Check the battery in the key fob for voltage using a multimeter.
2
Replace the key fob battery with a new one to ensure proper power supply.
3
Inspect the key fob for physical damage or wear.
4
Verify if the vehicle’s door locks can be operated manually using the key.
5
Scan the vehicle for any error codes related to the keyless entry system using an OBD-II scanner.
6
Test the key fob functionality in close proximity to the vehicle to rule out distance issues.

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

•Flathead screwdriver
•Multimeter
•OBD-II scanner

Parts Required

•Key fob battery (CR2032 or equivalent)

Related Faults

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Diagnostic Steps

1
Check the battery in the key fob for voltage using a multimeter.
2
Replace the key fob battery with a new one to ensure proper power supply.
3
Inspect the key fob for physical damage or wear.
4
Verify if the vehicle’s door locks can be operated manually using the key.
5
Scan the vehicle for any error codes related to the keyless entry system using an OBD-II scanner.
6
Test the key fob functionality in close proximity to the vehicle to rule out distance issues.

Solution

1. Preparation

Gather necessary tools: flathead screwdriver, new key fob battery (CR2032 or equivalent), and multimeter.
Ensure the vehicle is parked in a safe location with the engine off.

2. Replace Key Fob Battery

Sub-steps:
1. Use the flathead screwdriver to gently pry open the key fob casing.
2. Remove the old battery and note its orientation.
3. Insert the new battery in the same orientation as the old one.
4. Snap the key fob casing back together securely.

3. Test Key Fob

Sub-steps:
1. Stand close to the vehicle and press the unlock button on the key fob.
2. Observe if the vehicle responds (lights flash or doors unlock).

4. Reprogram 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. Cycle the ignition from "ON" to "OFF" five times within 10 seconds.
3. Leave the key in the "ON" position on the last cycle. The doors should lock and unlock, indicating the vehicle is in programming mode.
4. Press the lock button on the key fob. The doors will lock and unlock again to confirm programming.
5. Turn off the ignition to exit programming mode.