how to troubleshoot my Toyota Highlander’s remote start not working

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

516 words

Problem Statement

Learn how to troubleshoot and fix the remote start issue in your Toyota Highlander. Step-by-step guide with diagnostic steps and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before working on electrical components.
•Ensure the vehicle is in an open area when testing the remote start function to avoid exhaust buildup.

Symptoms

•Remote start button on the key fob does not initiate engine start
•Indicator lights on the key fob do not illuminate when pressed
•Vehicle starts normally using the ignition key
•Security or immobilizer warning light is illuminated on the dashboard
•No responding sound from the engine when attempting to remote start

Diagnostic Steps

1
Check the battery in the key fob for voltage using a multimeter.
2
Inspect the vehicle's security system for any active warnings or alerts.
3
Verify that all doors, the hood, and the trunk are securely closed; remote start may not work if any are ajar.
4
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the remote start system.
5
Confirm that the remote start system is properly programmed and not disabled in the vehicle's settings.
6
Test the range of the remote start function by trying from different distances away from the vehicle.

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

•Multimeter
•Small flathead screwdriver
•OBD-II scanner
•Socket set

Parts Required

•Key fob battery (CR2032 or as specified)

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Symptoms

•Remote start button on the key fob does not initiate engine start

•Indicator lights on the key fob do not illuminate when pressed

•Vehicle starts normally using the ignition key

•Security or immobilizer warning light is illuminated on the dashboard

•No responding sound from the engine when attempting to remote start

Diagnostic Steps

1
Check the battery in the key fob for voltage using a multimeter.
2
Inspect the vehicle's security system for any active warnings or alerts.
3
Verify that all doors, the hood, and the trunk are securely closed; remote start may not work if any are ajar.
4
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the remote start system.
5
Confirm that the remote start system is properly programmed and not disabled in the vehicle's settings.
6
Test the range of the remote start function by trying from different distances away from the vehicle.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is in a safe location and that all safety precautions are followed.

2. Key Fob Battery Replacement

Open the key fob using a small flathead screwdriver or a similar tool to gently pry it apart.
Remove the old battery, noting the orientation.
Insert a new battery (CR2032 or as specified in the vehicle manual) in the correct orientation.
Snap the key fob back together.

3. Security System Reset

Disconnect the vehicle's battery by removing the negative terminal using a socket set.
Wait for 5-10 minutes to allow the vehicle's computer systems to reset.
Reconnect the battery terminal and ensure it is tightened securely.

4. Remote Start Reprogramming

Insert the key into the ignition and turn it to the “On” position without starting the engine.
Press the remote start button on the key fob and hold it for 5-10 seconds.
Turn the ignition off and remove the key.
Test the remote start function again.