How can I troubleshoot the remote start feature not working in my 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

4 min read

672 words

Problem Statement

Learn how to troubleshoot and fix the remote start feature not working in your 2020 Toyota Highlander with this comprehensive guide.

Affected Component

remote start system

Estimated Time

1-2 hours

Symptoms

•Remote start button does not respond when pressed.
•Engine does not start but the vehicle lights flash.
•Remote start works intermittently.
•Remote start feature activates, but the engine shuts off after a few seconds.

Diagnostic Steps

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 flathead screwdriver
•Replacement battery (CR2032)
•OBD-II Scanner/Code Reader

Related Faults

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Troubleshooting Remote Start Feature Not Working in a 2020 Toyota Highlander

The remote start feature in your 2020 Toyota Highlander can malfunction for several reasons. Below is a structured troubleshooting guide to help identify and resolve the issue.

Step 1: Check the Key Fob Battery

Symptoms: Remote start button not responding or intermittent functionality.

Tools Required:

Small flathead screwdriver (to open the key fob if necessary)
Replacement battery (CR2032 typically used in Toyota key fobs)

Instructions:

Open the Key Fob: Use the small flathead screwdriver to gently pry open the key fob casing.
Inspect Battery: Remove the old battery and check for corrosion or damage.
Replace Battery: Insert a new CR2032 battery, ensuring the positive side is facing the correct direction as indicated.
Reassemble Key Fob: Snap the fob back together and test the remote start feature.

Step 2: Verify Vehicle Settings

Symptoms: Engine starting but shutting off immediately.

Instructions:

Check for Security Settings: Ensure that the vehicle is not in valet mode or that any active security features (like the alarm system) are not preventing remote start.
Consult Owner's Manual: Refer to the owner's manual for information on remote start settings and ensure they are configured correctly.

Step 3: Ensure Proper Conditions for Remote Start

Symptoms: Remote start not activating at all.

Instructions:

Check Transmission: Ensure the vehicle is in "Park" mode. The remote start will not work if the vehicle is in gear.
Check Doors and Hood: Ensure all doors are closed, including the hood. The remote start system will disable if any door or the hood is ajar.
Check Battery Voltage: A weak battery can prevent remote start from functioning. Ensure the vehicle's battery is fully charged.

Step 4: Diagnostic Scan

Symptoms: No specific symptoms, but the issue persists.

Tools Required:

OBD-II Scanner/Code Reader

Instructions:

Connect the OBD-II Scanner: Locate the OBD-II port under the dashboard on the driver's side and connect the scanner.
Run Diagnostics: Follow the scanner's instructions to read any trouble codes. Pay attention to codes related to the engine, security system, or remote start system.
Document Codes: Take note of any codes generated and consult the repair manual or online resources for further information on the codes.

Step 5: Check for Software Updates

Symptoms: Remote start feature not functioning as intended.

Instructions:

Contact Dealer: Inquire if there are any software updates or recalls related to the remote start system for your vehicle model.
Schedule Service: If an update is available, schedule a service appointment at your Toyota dealership.

Repair Instructions

If Key Fob Battery Replacement Didn't Work

Inspect Receiver Module: If the remote start is still non-functional, the receiver module may be faulty. This usually requires professional diagnosis and repair.
Check Wiring: Inspect wiring to the remote start system for any damage or disconnections.
Test Relay: Test the remote start relay for continuity. If faulty, replace it with a new part.

If Software Update is Needed

Backup Existing Settings: If possible, backup any personalized settings before performing updates.
Perform Update: Follow the dealer's instructions for updating the vehicle's software.

Final Steps

Test the System: Once repairs or updates are completed, test the remote start feature multiple times to ensure functionality.
Document Repairs: Keep a record of any repairs or parts replaced for future reference.

Conclusion

By following these diagnostic steps and repair instructions, you should be able to identify and potentially resolve the issues with the remote start feature in your 2020 Toyota Highlander. If problems persist, consider seeking assistance from a certified Toyota technician for further diagnosis and repair.