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

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

534 words

Problem Statement

Learn how to diagnose and fix the remote start issue in your Toyota Highlander (2020-present). 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 battery before working on electrical systems
•Ensure the vehicle is in a secure location before attempting remote start troubleshooting

Symptoms

•Remote start function does not activate when pressing the key fob button
•Engine does not crank or start
•No response or feedback from the vehicle upon attempting remote start
•Security indicator light may be flashing or illuminated
•Possible issues with the key fob battery or vehicle battery

Diagnostic Steps

1
Check the key fob battery to ensure it is charged and functional
2
Inspect the vehicle battery for proper voltage and connection
3
Confirm that all doors, hood, and trunk are fully closed
4
Verify if the vehicle is equipped with the remote start option in the settings or via the infotainment system
5
Scan for any diagnostic trouble codes (DTCs) using an OBD-II scanner
6
Test the key fob with another Highlander if available

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

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

Parts Required

•CR2032 key fob battery

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Symptoms

•Remote start function does not activate when pressing the key fob button

•Engine does not crank or start

•No response or feedback from the vehicle upon attempting remote start

•Security indicator light may be flashing or illuminated

•Possible issues with the key fob battery or vehicle battery

Diagnostic Steps

1
Check the key fob battery to ensure it is charged and functional
2
Inspect the vehicle battery for proper voltage and connection
3
Confirm that all doors, hood, and trunk are fully closed
4
Verify if the vehicle is equipped with the remote start option in the settings or via the infotainment system
5
Scan for any diagnostic trouble codes (DTCs) using an OBD-II scanner
6
Test the key fob with another Highlander if available

Solution

1. Key Fob Battery Replacement

Tools Required: Small flathead screwdriver or a coin.
Open the key fob by prying it apart with the screwdriver or coin.
Remove the old battery and replace it with a new CR2032 battery, ensuring correct polarity.
Reassemble the key fob and test the remote start function.

2. Vehicle Battery Inspection

Tools Required: Multimeter, socket set.
Disconnect the negative terminal of the vehicle battery.
Use a multimeter to check the battery voltage; it should be around 12.6 volts.
If voltage is low, charge or replace the battery as necessary.
Reconnect the negative terminal and test the remote start again.

3. System Reset

Tools Required: OBD-II scanner (if DTCs are present).
Connect the OBD-II scanner to the vehicle’s diagnostic port.
Clear any trouble codes that may be affecting the remote start system.
Disconnect the scanner and attempt to use the remote start function again.

4. Verify Door Closure and Settings

Ensure all doors, hood, and trunk are securely closed.
Access the vehicle's settings through the infotainment system to confirm remote start is enabled.
If necessary, toggle the remote start function off and back on.