how to fix the remote start not working on Toyota Highlander Fourth Generation (2020-present)

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

575 words

Problem Statement

Learn how to diagnose and fix the remote start issue on your Toyota Highlander (2020-present). Step-by-step guide with tools and tips.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components if applicable.
•Ensure the vehicle is in a well-ventilated area when performing diagnostic checks.

Symptoms

•Remote start button on key fob does not initiate engine start
•No response from the vehicle when attempting to use remote start
•Check engine light illuminated intermittently
•Vehicle security light blinking rapidly
•Battery in the key fob is low or dead

Diagnostic Steps

1
Check the battery level of the key fob using a multimeter or replace it with a new battery.
2
Verify that the remote start feature is enabled in the vehicle's settings via the infotainment system.
3
Inspect the key fob for physical damage or wear.
4
Scan the vehicle for error codes using an OBD-II scanner to identify any related issues.
5
Confirm that all doors and the hood are securely closed, as remote start will not activate if they are ajar.
6
Check for any blown fuses related to the remote start system in the fuse box.

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
•Flat-head screwdriver
•Basic hand tools

Parts Required

•CR2032 battery
•Replacement fuse

Related Faults

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Diagnostic Steps

1
Check the battery level of the key fob using a multimeter or replace it with a new battery.
2
Verify that the remote start feature is enabled in the vehicle's settings via the infotainment system.
3
Inspect the key fob for physical damage or wear.
4
Scan the vehicle for error codes using an OBD-II scanner to identify any related issues.
5
Confirm that all doors and the hood are securely closed, as remote start will not activate if they are ajar.
6
Check for any blown fuses related to the remote start system in the fuse box.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, basic hand tools.
Ensure the vehicle is parked safely and that you have access to the key fob.

2. Key Fob Battery Replacement

Open the key fob using a flat-head screwdriver to avoid damaging the casing.
Remove the old battery and note the orientation.
Insert a new battery (CR2032 or equivalent) in the same orientation as the old one.
Reassemble the key fob securely.

3. Verify Vehicle Settings

Turn on the vehicle using the ignition key.
Navigate to the settings menu on the infotainment system.
Locate the "Remote Start" option and ensure it is turned on.
Save changes and exit settings.

4. Inspect Fuses

Open the fuse box located under the dashboard or hood (refer to the owner’s manual for specific location).
Identify the fuse related to the remote start system (refer to the fuse diagram).
Check the fuse for continuity; replace if blown with a fuse of the same amperage.

5. Clear Codes (if applicable)

Connect the OBD-II scanner to the vehicle’s diagnostic port.
Turn on the ignition without starting the engine.
Scan for error codes and note any issues related to the remote start.
Clear any error codes that may be affecting the system.