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

Toyota Highlander XU70 (2020-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

553 words

Problem Statement

Learn how to troubleshoot and fix the remote start issue on your 2020-present Toyota Highlander XU70. Step-by-step guide with diagnostic and repair instructions.

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 shocks or shorts.

Symptoms

•Remote start button is unresponsive
•Check engine light illuminated
•Vehicle does not start when remote start is activated
•Alarm system activates unexpectedly
•Door locks are not responding to the remote

Diagnostic Steps

1
Verify that the vehicle is in the proper range for remote starting.
2
Check the battery condition and voltage of the key fob.
3
Inspect the vehicle’s fuse box for any blown fuses related to the remote start system.
4
Use an OBD-II scanner to check for stored trouble codes that may indicate issues.
5
Ensure all doors and the hood are closed, as open doors can prevent remote start.
6
Test the operation of the remote start system using a different key fob 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
•Basic hand tools (screwdrivers, socket set)

Parts Required

•Key fob battery (CR2032)
•Replacement fuses (as needed)

Related Faults

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Diagnostic Steps

1
Verify that the vehicle is in the proper range for remote starting.
2
Check the battery condition and voltage of the key fob.
3
Inspect the vehicle’s fuse box for any blown fuses related to the remote start system.
4
Use an OBD-II scanner to check for stored trouble codes that may indicate issues.
5
Ensure all doors and the hood are closed, as open doors can prevent remote start.
6
Test the operation of the remote start system using a different key fob if available.

Solution

1. Preparation

Gather necessary tools: OBD-II scanner, multimeter, basic hand tools (screwdrivers, socket set).
Ensure the car is parked safely and the engine is turned off.
Disconnect the battery to prevent any electrical mishaps.

2. Key Fob Battery Replacement

Locate the small seam on the key fob.
Use a flathead screwdriver to gently pry open the fob.
Replace the old battery (typically a CR2032) with a new one, ensuring correct polarity.
Reassemble the key fob and test the remote start function.

3. Fuse Inspection

Remove the fuse box cover, typically located under the dash or in the engine compartment.
Identify the fuse related to the remote start system (refer to the fuse diagram on the cover).
Use a multimeter to check for continuity or visually inspect for a blown fuse.
Replace any blown fuses with the appropriate amperage rating.

4. Check for Error Codes

Reconnect the battery and use the OBD-II scanner to check for any trouble codes.
Clear any codes if found and attempt to use the remote start again.
If issues persist, note the codes and proceed with further diagnostics based on the specific codes.

5. Verify Door and Hood Closure

Manually check that all doors and the hood are fully closed.
Inspect door and trunk sensors for any signs of damage or misalignment.
Adjust or replace any faulty sensors as they may prevent remote start operation.