how to troubleshoot the remote start not working on my Toyota Highlander Fourth Generation (2020-pre...

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

574 words

Problem Statement

Learn how to troubleshoot and fix the remote start issue on your Toyota Highlander (2020-present). 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

•Disconnect the battery before working on electrical systems to prevent shock

Symptoms

•Remote start button does not respond when pressed
•Vehicle does not start or make any noise when attempting remote start
•Check engine light illuminated on the dashboard
•Security indicator light blinking on the dashboard
•Remote key fob battery is low or dead
•Vehicle starts normally using the ignition key

Diagnostic Steps

1
Verify that the vehicle is in a suitable condition for remote starting (e.g., doors closed, hood shut)
2
Check the battery condition of the remote key fob and replace if necessary
3
Inspect for any DTC (Diagnostic Trouble Codes) using an OBD-II scanner
4
Ensure that the vehicle is equipped with the remote start feature and that it is properly activated in the vehicle settings
5
Check the vehicle's battery voltage to ensure it has sufficient charge
6
Inspect the wiring and connections related to the remote start system for signs of damage or loose connections

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
•Small flathead screwdriver
•Multimeter
•Wire strippers
•Electrical tape

Parts Required

•Key fob battery (CR2032)
•Electrical wire (if repairs are needed)

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Symptoms

•Remote start button does not respond when pressed

•Vehicle does not start or make any noise when attempting remote start

•Check engine light illuminated on the dashboard

•Security indicator light blinking on the dashboard

•Remote key fob battery is low or dead

•Vehicle starts normally using the ignition key

Diagnostic Steps

1
Verify that the vehicle is in a suitable condition for remote starting (e.g., doors closed, hood shut)
2
Check the battery condition of the remote key fob and replace if necessary
3
Inspect for any DTC (Diagnostic Trouble Codes) using an OBD-II scanner
4
Ensure that the vehicle is equipped with the remote start feature and that it is properly activated in the vehicle settings
5
Check the vehicle's battery voltage to ensure it has sufficient charge
6
Inspect the wiring and connections related to the remote start system for signs of damage or loose connections

Solution

1. Prepare for Repair

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the ignition is off.
Disconnect the negative terminal of the battery to prevent electrical shocks.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver, new battery (typically CR2032).
Sub-steps:
1. Use the flathead screwdriver to gently pry open the key fob casing.
2. Remove the old battery carefully.
3. Insert the new battery, ensuring the correct polarity (+/-).
4. Snap the key fob casing back together.

3. Reset Remote Start Feature

Tools Required: OBD-II scanner.
Sub-steps:
1. Connect the OBD-II scanner to the vehicle's diagnostic port.
2. Turn on the ignition (do not start the engine).
3. Navigate to the remote start settings in the scanner.
4. Follow on-screen prompts to reset or re-enable the remote start feature.

4. Inspect and Repair Wiring Connections

Tools Required: Wire strippers, electrical tape, multimeter.
Sub-steps:
1. Locate the wiring harness for the remote start system.
2. Visually inspect for any frayed wires or loose connections.
3. Use a multimeter to check for continuity in the wiring.
4. Repair any damaged wires with electrical tape or replace as needed.

5. Reconnect Battery

Reconnect the negative terminal of the battery.
Start the vehicle using the ignition to ensure normal operation.