How do I fix the remote start problems in my 2021 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

532 words

Problem Statement

Learn how to diagnose and fix remote start issues in your 2021 Toyota Highlander with step-by-step instructions and required tools.

Affected Component

Remote Start System

Estimated Time

1-2 hours

Symptoms

•Remote Start Fails to Engage
•Engine Starts but Shuts Off
•Dash Warning Lights
•Key Fob Not Responding

Diagnostic Steps

1
Check the Key Fob Battery
2
Ensure Vehicle is in Park
3
Check Vehicle Settings
4
Check Battery Voltage

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

•Small Phillips screwdriver
•Replacement battery (CR2032)
•Vehicle owner's manual
•Multimeter
•OBD-II scanner

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Solution

Remote Start Problems in a 2021 Toyota Highlander

Step 1: Check the Key Fob Battery

Tools Required: Small Phillips screwdriver, replacement battery (CR2032).
Instructions:
1. Use the screwdriver to open the key fob casing.
2. Inspect the battery for corrosion or weak charge.
3. Replace the battery if necessary.
4. Reassemble the key fob and test the remote start feature.

Step 2: Ensure Vehicle is in Park

Symptoms: Attempting to start while the vehicle is not in 'Park' can prevent remote start.
Instructions:
1. Ensure the gear shifter is in the 'Park' position.
2. Attempt the remote start again.

Step 3: Check Vehicle Settings

Tools Required: Vehicle owner's manual.
Instructions:
1. Access the vehicle settings via the infotainment system.
2. Navigate to the 'Vehicle' settings.
3. Ensure that remote start is enabled in the settings.

Step 4: Check Battery Voltage

Tools Required: Multimeter.
Instructions:
1. Turn off the vehicle and open the hood.
2. Measure the voltage of the battery using the multimeter. A healthy battery should read around 12.6 volts.
3. If the voltage is low (below 12.4 volts), charge or replace the battery.

Repair Instructions

If the Key Fob is Not Working

Replace the Key Fob Battery: Follow the instructions in Step 1.
Reprogram the Key Fob (if necessary):
- Tools Required: OBD-II scanner (if needed).
- Instructions:
  1. Insert the key into the ignition and turn to the ON position without starting the engine.
  2. Press the lock button on the key fob for 1 second, then press the unlock button for 1 second.
  3. Turn the ignition off and remove the key.
  4. Test the remote start function again.

If the Vehicle Shuts Off After Starting

Check the Brake Pedal Position Switch:
- Tools Required: Multimeter.
- Instructions:
  1. Locate the brake pedal position switch under the dashboard.
  2. Using the multimeter, check for continuity when the brake pedal is depressed.
  3. Replace the switch if it is faulty.
Inspect for Fault Codes:
- Tools Required: OBD-II scanner.
- Instructions:
  1. Connect the OBD-II scanner to the vehicle’s port.
  2. Check for any diagnostic trouble codes (DTCs) related to the starting system.
  3. Clear any codes and attempt to remote start again.

If All Else Fails

Consult the Dealer or Professional Technician:
- If the problem persists after all troubleshooting, consult your local Toyota dealer or a qualified automotive technician for a deeper diagnostic.

Conclusion

By following the steps outlined above, you should be able to diagnose and potentially fix remote start issues with your 2021 Toyota Highlander. Always ensure safety by working in a well-ventilated area and following manufacturer instructions. If you’re uncomfortable performing any steps, seek professional assistance.