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

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 in your 2020-present Toyota Highlander. 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

•Disconnect the battery before working on electrical systems to prevent short circuits.

Symptoms

•Remote start button does not respond when pressed
•Vehicle does not start or crank when attempting to use the remote start
•Key fob battery is low or dead
•Security light on the dashboard is illuminated
•Engine starts but shuts off immediately after starting
•Check engine light may be illuminated

Diagnostic Steps

1
Check the key fob battery status and replace if necessary.
2
Scan the vehicle's OBD-II system for any trouble codes that may indicate an issue with the remote start system.
3
Ensure that all doors, hood, and trunk are securely closed, as the remote start feature may not activate if any are ajar.
4
Verify that the vehicle is in 'Park' and the brake pedal is not pressed when attempting to start remotely.
5
Test the remote start feature from a different location to rule out distance-related issues.
6
Inspect the remote starter module for any visible damage or loose connections.

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
•Screwdriver set

Parts Required

•CR2032 key fob battery
•Replacement wiring or connectors (if necessary)

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Symptoms

•Remote start button does not respond when pressed

•Vehicle does not start or crank when attempting to use the remote start

•Key fob battery is low or dead

•Security light on the dashboard is illuminated

•Engine starts but shuts off immediately after starting

•Check engine light may be illuminated

Diagnostic Steps

1
Check the key fob battery status and replace if necessary.
2
Scan the vehicle's OBD-II system for any trouble codes that may indicate an issue with the remote start system.
3
Ensure that all doors, hood, and trunk are securely closed, as the remote start feature may not activate if any are ajar.
4
Verify that the vehicle is in 'Park' and the brake pedal is not pressed when attempting to start remotely.
5
Test the remote start feature from a different location to rule out distance-related issues.
6
Inspect the remote starter module for any visible damage or loose connections.

Solution

1. Preparation

Gather necessary tools: OBD-II scanner, multimeter, screwdriver set, and a new key fob battery if needed.
Ensure the vehicle is parked on a level surface and the ignition is off.

2. Replace Key Fob Battery

Open the key fob using a small flathead screwdriver.
Remove the old battery and replace it with a new CR2032 battery, ensuring the positive side is facing up.
Reassemble the key fob and test the remote start function.

3. Check and Clear OBD-II Codes

Connect the OBD-II scanner to the vehicle's diagnostic port, usually located under the dashboard.
Turn the ignition to the "On" position without starting the engine.
Scan for trouble codes and note any relevant codes that may affect the remote start system.
Clear any codes if they are not indicative of an ongoing issue, then attempt to use the remote start again.

4. Inspect Remote Start Module

Locate the remote start module (usually found under the dashboard or near the steering column).
Visually inspect for any loose or damaged wiring connections.
Reconnect any loose wires and repair any damaged connections as necessary.

5. Test Remote Start Functionality

With all doors, hood, and trunk closed, ensure the vehicle is in "Park."
Attempt to start the vehicle remotely using the key fob.
If the remote start works, reassemble any components that were removed or inspected.