why does my Toyota Highlander Fourth Generation (2020-present) remote start not work anymore

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

562 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 components to prevent short circuits.

Symptoms

•Remote start button on the key fob does not respond
•Engine does not start remotely
•Dashboard lights briefly illuminate but engine fails to crank
•Check engine light may be illuminated
•Key fob may show low battery indicator
•Vehicle security system may trigger or flash

Diagnostic Steps

1
Check the key fob battery and replace if necessary.
2
Verify that the vehicle is in a suitable environment for remote start (e.g., not in gear, hood closed).
3
Scan the vehicle's onboard diagnostics for any error codes using an OBD-II scanner.
4
Inspect the vehicle's fuses related to the remote start system.
5
Confirm that the vehicle's security system is not preventing remote start activation.
6
Test the remote start feature 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
•Small flathead screwdriver

Parts Required

•Key fob battery (usually CR2032)
•Replacement fuses (if necessary)

Related Faults

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Diagnostic Steps

1
Check the key fob battery and replace if necessary.
2
Verify that the vehicle is in a suitable environment for remote start (e.g., not in gear, hood closed).
3
Scan the vehicle's onboard diagnostics for any error codes using an OBD-II scanner.
4
Inspect the vehicle's fuses related to the remote start system.
5
Confirm that the vehicle's security system is not preventing remote start activation.
6
Test the remote start feature using a different key fob if available.

Solution

1. Preparation

Gather necessary tools: OBD-II scanner, multimeter, and replacement key fob battery.
Ensure the vehicle is parked in a safe area with adequate lighting.
Disconnect the battery if you will be working on any electronic components.

2. Key Fob Battery Replacement

Open the key fob using a small flathead screwdriver.
Remove the old battery and replace it with a new one (typically CR2032).
Ensure the battery is oriented correctly, matching the positive and negative indications.
Reassemble the key fob securely.

3. Fuse Inspection

Locate the fuse box (usually under the dashboard or in the engine compartment).
Identify the fuse for the remote start system (refer to the vehicle’s manual).
Use a multimeter to test the fuse for continuity or visually inspect it for any signs of damage.
Replace any blown fuses with the same rating.

4. Security System Check

Verify that the vehicle is not in a security lockout state (check for flashing security light).
If necessary, reset the security system by disconnecting the battery for 10 minutes and reconnecting it.
Ensure that doors are fully closed and the hood is latched.

5. Reprogramming the Remote Start Feature

If the issue persists, reprogram the remote start feature:
- Insert the key into the ignition and turn it to the "On" position (do not start the engine).
- Press the remote start button twice within 5 seconds.
- Turn the ignition off and remove the key.
Test the remote start function again.