how to fix the remote start feature not working on Toyota Highlander XU70 (2020-Present)

Toyota Highlander XU70 (2020-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

4 min read

603 words

Problem Statement

Learn how to diagnose and fix the remote start issue on your 2020-Present Toyota Highlander XU70. 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

•Ensure the vehicle is in a well-ventilated area when testing remote start features to prevent exhaust buildup.

Symptoms

•Remote start button not responding
•Vehicle does not start when remote start is activated
•No sound or indication from the vehicle when attempting to use remote start
•Key fob battery is functional but remote start still fails
•No error messages or warning lights on the dashboard

Diagnostic Steps

1
Check the battery of the key fob to ensure it has sufficient charge.
2
Attempt to start the vehicle with the key fob from different distances to rule out range issues.
3
Inspect the vehicle's doors and hood to ensure they are fully closed, as remote start may be disabled if any are ajar.
4
Scan the vehicle's onboard diagnostics (OBD-II) for any relevant error codes related to the remote start system.
5
Verify that the remote start feature is enabled in the vehicle's settings menu, if applicable.
6
Check for any aftermarket modifications that may interfere with the remote start functionality.

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
•Flathead screwdriver
•Multimeter

Parts Required

•Key fob battery (CR2032)

Related Faults

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Diagnostic Steps

1
Check the battery of the key fob to ensure it has sufficient charge.
2
Attempt to start the vehicle with the key fob from different distances to rule out range issues.
3
Inspect the vehicle's doors and hood to ensure they are fully closed, as remote start may be disabled if any are ajar.
4
Scan the vehicle's onboard diagnostics (OBD-II) for any relevant error codes related to the remote start system.
5
Verify that the remote start feature is enabled in the vehicle's settings menu, if applicable.
6
Check for any aftermarket modifications that may interfere with the remote start functionality.

Solution

1. Preparation

Gather necessary tools: OBD-II scanner, flathead screwdriver, multimeter, and a new key fob battery if needed.
Ensure the vehicle is parked in a safe area with sufficient space and that the engine is off.

2. Replace Key Fob Battery

Sub-steps:
1. Use a flathead screwdriver to gently pry open the key fob casing.
2. Remove the old battery (usually a CR2032) and replace it with a new battery, ensuring correct polarity.
3. Snap the key fob back together securely.
Tools Required: Flathead screwdriver.

3. Verify Door and Hood Closure

Sub-steps:
1. Open and close all vehicle doors and the hood to ensure they are securely latched.
2. Check for any obstructions that may prevent the doors or hood from closing properly.

4. Check Vehicle Settings

Sub-steps:
1. Start the vehicle using the ignition key.
2. Access the vehicle settings via the infotainment system.
3. Navigate to the “Remote Start” settings and ensure that the feature is enabled.
Tools Required: Vehicle owner's manual for reference.

5. Scan for Error Codes

Sub-steps:
1. Connect the OBD-II scanner to the vehicle's diagnostic port.
2. Turn the ignition to the "ON" position without starting the engine.
3. Follow the scanner's prompts to read any diagnostic trouble codes (DTCs).
4. Address any codes related to the remote start system by diagnosing their causes.
Tools Required: OBD-II scanner.

6. Inspect for Aftermarket Modifications

Sub-steps:
1. Visually inspect the vehicle for any aftermarket alarm or remote start systems that may interfere with factory settings.
2. If any modifications are found, consult the installation manual or the installer for troubleshooting steps.