my Toyota Highlander XU70 (2020-Present) remote start isn't working, what should I check?

Toyota Highlander XU70 (2020-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

537 words

Problem Statement

Learn how to diagnose and fix remote start issues in the 2020-Present Toyota Highlander XU70. Step-by-step guide with symptoms and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent short circuits.
•Allow the vehicle to cool down before inspecting any components related to the engine or electrical systems.

Symptoms

•Remote start button does not respond when pressed
•Check engine light illuminated
•Doors do not lock/unlock with the remote
•Vehicle does not start remotely but starts with the key
•Remote key fob battery low warning indication

Diagnostic Steps

1
Check the battery level of the remote key fob using a multimeter or by replacing the battery.
2
Scan the vehicle's OBD-II system for any error codes that may indicate issues with the starting system.
3
Inspect the remote start system fuse in the fuse box and replace if blown.
4
Verify the vehicle is in park (for automatic transmission) and the hood is closed, as these are safety features.
5
Test the remote start feature with another key fob, if available, to rule out a faulty key fob.
6
Check for any aftermarket modifications that might interfere with the remote start system.

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

•Multimeter
•Small flathead screwdriver
•Fuse puller or pliers

Parts Required

•CR2032 battery (for remote fob)
•Replacement fuse (if needed)

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Diagnostic Steps

1
Check the battery level of the remote key fob using a multimeter or by replacing the battery.
2
Scan the vehicle's OBD-II system for any error codes that may indicate issues with the starting system.
3
Inspect the remote start system fuse in the fuse box and replace if blown.
4
Verify the vehicle is in park (for automatic transmission) and the hood is closed, as these are safety features.
5
Test the remote start feature with another key fob, if available, to rule out a faulty key fob.
6
Check for any aftermarket modifications that might interfere with the remote start system.

Solution

1. Preparation

Gather all tools and parts needed for the repair.
Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Replace Remote Fob Battery

Open the remote key fob by using a small flathead screwdriver to pry it apart.
Remove the old battery and replace it with a new CR2032 battery, ensuring the positive (+) side is facing up.
Snap the fob back together securely.

3. Inspect and Replace Fuse

Locate the fuse box, typically found under the dashboard or in the engine compartment.
Use a fuse puller or pliers to remove the fuse associated with the remote start system.
Inspect the fuse for continuity using a multimeter; replace it with a new fuse of the same amperage if blown.
Reinstall the fuse and close the fuse box.

4. Confirm Vehicle Settings

Ensure the vehicle is in park and the hood is securely closed.
If equipped, check that the "remote start" option is enabled in the vehicle settings using the infotainment system.

5. Reconnect Battery

Reconnect the vehicle battery and ensure all connections are tight.
Test the remote start feature again to see if functionality is restored.