how to fix the remote start not working on my Toyota Highlander Fourth Generation (2020-present)?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

576 words

Problem Statement

Learn how to diagnose and fix the remote start issue in your 2020-present Toyota Highlander. Step-by-step guide with diagnostic procedures 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 any electrical systems to prevent shocks or shorts.

Symptoms

•Remote start does not activate when button is pressed on the key fob
•Vehicle fails to start or only starts intermittently
•"Engine Start/Stop" indicator light is not illuminated
•Security indicator light may be flashing
•No audible confirmation (horn honk) when remote start is attempted

Diagnostic Steps

1
Check the key fob battery to ensure it has sufficient charge.
2
Verify that the vehicle is in park and all doors are closed before attempting to remote start.
3
Inspect the vehicle's security system and ensure it is not in a locked state.
4
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the starting system.
5
Confirm that the remote start feature is enabled in the vehicle settings via the infotainment system.
6
Test the key fob with a known working remote start system to rule out fob malfunction.

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 screwdriver
•Multimeter (optional)
•OBD-II scanner

Parts Required

•CR2032 key fob battery

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Diagnostic Steps

1
Check the key fob battery to ensure it has sufficient charge.
2
Verify that the vehicle is in park and all doors are closed before attempting to remote start.
3
Inspect the vehicle's security system and ensure it is not in a locked state.
4
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the starting system.
5
Confirm that the remote start feature is enabled in the vehicle settings via the infotainment system.
6
Test the key fob with a known working remote start system to rule out fob malfunction.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is in a well-ventilated area and the engine is off.
Disconnect the negative battery terminal to prevent electrical shorts during repairs.

2. Check Key Fob Battery

Tools Required: Small screwdriver, multimeter (optional)
Remove the back cover of the key fob using a small screwdriver.
Test the battery voltage with a multimeter; it should be around 3 volts.
If the battery is low, replace it with a new CR2032 battery, ensuring correct polarity when inserting.

3. Inspect Vehicle Settings

Reconnect the battery and start the vehicle normally.
Navigate to the vehicle settings in the infotainment system.
Locate and confirm that the remote start feature is activated. If it is not, enable it and save the settings.

4. Check Security System

Inspect the vehicle's security system to ensure it is not preventing the remote start.
If the security light is flashing, reset the system by performing the following:
- Lock and unlock the vehicle using the key fob.
- Start the vehicle with the key and ensure all systems are functioning.

5. Verify Wiring and Connections

Remove the dashboard cover or any panels needed to access the remote start wiring harness.
Visually inspect all connections for loose wires or corrosion.
Reconnect any loose connectors and secure the wiring harness.

6. Final Testing

After all adjustments and checks, test the remote start system by pressing the remote start button on the key fob.
Ensure the vehicle starts successfully and responds as expected.