What are the common issues with the keyless entry system in the 2021 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

579 words

Problem Statement

Learn about common issues with the keyless entry system in the 2021 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.

Affected Component

keyless entry system

Estimated Time

1-2 hours

Symptoms

•Key Fob Not Responding
•Intermittent Operation
•Range Issues
•Warning Lights

Diagnostic Steps

1
Check the Key Fob Battery
2
Inspect Key Fob for Physical Damage
3
Verify Vehicle Settings
4
Scan for Diagnostic Trouble Codes (DTCs)

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 flathead screwdriver
•Multimeter (optional)
•Visual inspection
•Owner’s manual
•OBD-II scanner

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Solution

Common Issues with the Keyless Entry System in the 2021 Toyota Highlander

The keyless entry system in the 2021 Toyota Highlander is a convenient feature, but it can experience several common issues. Below are symptoms, diagnostic steps, tools required, and repair instructions for these issues.

Common Diagnostic Steps

Check the Key Fob Battery
- Symptoms: Key fob not responding or range issues.
- Tool Required: Small flathead screwdriver, multimeter (optional).
Inspect Key Fob for Physical Damage
- Symptoms: Intermittent operation or failure to respond.
- Tool Required: Visual inspection.
Verify Vehicle Settings
- Symptoms: Key fob works but does not perform all functions.
- Tool Required: Owner’s manual.
Scan for Diagnostic Trouble Codes (DTCs)
- Symptoms: Warning lights on the dashboard.
- Tool Required: OBD-II scanner.

Repair Instructions

Step 1: Check the Key Fob Battery

Open the Key Fob:
- Use a small flathead screwdriver to carefully pry open the key fob casing.
Replace the Battery:
- Remove the old battery and replace it with a new one (usually a CR2032).
- Ensure correct polarity when inserting the new battery.
Test the Fob:
- Press the lock and unlock buttons to check functionality.

Step 2: Inspect Key Fob for Physical Damage

Visual Inspection:
- Check for cracks or damage in the plastic casing.
- Inspect the circuit board for signs of corrosion or physical damage.
Repair or Replace:
- If damaged, consider replacing the key fob. If undamaged, proceed with reassembly.

Step 3: Verify Vehicle Settings

Consult Owner’s Manual:
- Check if the vehicle has specific settings for keyless entry that may have been unintentionally altered.
Reset Settings:
- If applicable, reset the keyless entry settings through the vehicle's settings menu.

Step 4: Scan for Diagnostic Trouble Codes (DTCs)

Connect OBD-II Scanner:
- Locate the OBD-II port under the dashboard near the driver’s seat.
- Connect the scanner and turn the ignition to the "ON" position without starting the engine.
Read DTCs:
- Follow the scanner’s instructions to retrieve any trouble codes related to the keyless entry system.
Address DTCs:
- Research the codes and follow appropriate manufacturer repair procedures to resolve any identified issues.

Additional Considerations

Reprogramming Key Fob:
- If replacing the battery or key fob does not resolve issues, you may need to reprogram the key fob. This usually requires a dealership or specialized tool.
Check Vehicle Antenna:
- If the key fob still has range issues, inspect the vehicle's keyless entry antenna and wiring for damage.
Professional Assistance:
- If problems persist, it may be necessary to seek assistance from a certified Toyota technician for advanced diagnostics.

By following these steps, you can diagnose and potentially resolve common issues with the keyless entry system in the 2021 Toyota Highlander. Always refer to the service manual for specific details related to your vehicle model.