how to troubleshoot Toyota Highlander Third Generation (2014-2019) remote start not working

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

564 words

Problem Statement

Troubleshoot and fix remote start issues on 2014-2019 Toyota Highlander. Step-by-step guide with diagnostic steps and solutions to restore functionality.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on the vehicle’s electrical systems to prevent shorts or shocks.

Symptoms

•Remote start button does not respond when pressed
•Engine does not crank or start remotely
•Security indicator light remains illuminated
•Key fob battery is not functioning or is dead
•Check engine light is illuminated
•No sound or feedback from the vehicle when attempting remote start

Diagnostic Steps

1
Check the key fob battery for proper voltage and replace if necessary.
2
Confirm that the vehicle is in a secure location and not in gear.
3
Verify that all doors are closed and locked; remote start will not function if doors are ajar.
4
Use an OBD-II scanner to check for any trouble codes that may indicate issues with the engine or security system.
5
Inspect the vehicle's security system and ensure that it is not preventing remote start due to a fault.
6
Test the remote start feature with a spare key fob, if available, to rule out key fob issues.

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
•Small flathead screwdriver
•Multimeter

Parts Required

•CR2032 key fob battery

Related Faults

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Diagnostic Steps

1
Check the key fob battery for proper voltage and replace if necessary.
2
Confirm that the vehicle is in a secure location and not in gear.
3
Verify that all doors are closed and locked; remote start will not function if doors are ajar.
4
Use an OBD-II scanner to check for any trouble codes that may indicate issues with the engine or security system.
5
Inspect the vehicle's security system and ensure that it is not preventing remote start due to a fault.
6
Test the remote start feature with a spare key fob, if available, to rule out key fob issues.

Solution

1. Preparation

Tools Required: OBD-II scanner, small flathead screwdriver, multimeter
Ensure the vehicle is parked safely and the ignition is off.
Disconnect the negative battery terminal to prevent electrical shorts during repair.

2. Replace Key Fob Battery

Use a small flathead screwdriver to carefully pry open the key fob casing.
Remove the old battery and replace it with a new CR2032 battery (ensure correct polarity).
Snap the key fob casing back together securely.

3. Check Security System

Reconnect the negative battery terminal and turn the ignition to the "ON" position without starting the vehicle.
Observe the security indicator light on the dashboard; it should turn off after a few seconds.
If the light remains on, consult the vehicle’s service manual for troubleshooting the security system.

4. Clear Error Codes

Plug the OBD-II scanner into the vehicle’s OBD-II port (usually located under the dashboard).
Follow the scanner's prompts to read and record any trouble codes.
Clear the codes and attempt to use the remote start again to see if the issue persists.

5. Inspect Remote Start Module (if equipped)

If the vehicle has an aftermarket remote start system, locate the remote start module under the dashboard.
Check all wiring connections and ensure they are secure.
Test the module according to the manufacturer’s instructions to verify functionality.