What should I do if my Highlander’s key fob is not working?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

505 words

Problem Statement

Learn how to diagnose and fix issues with your Toyota Highlander's key fob not working. Follow our step-by-step guide for battery replacement, reprogramming, and more.

Affected Component

key fob

Estimated Time

1-2 hours

Symptoms

•The key fob does not unlock/lock the doors.
•The panic button does not activate.
•The vehicle does not recognize the key fob when attempting to start.
•LED indicator on the fob does not light up when buttons are pressed.

Diagnostic Steps

1
Check the Battery
2
Check for Interference
3
Reprogram the Key Fob
4
Replace the Key Fob

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 (if necessary to open the fob)
•Replacement battery (CR2032 or CR2025, depending on the fob)
•Vehicle owner's manual (for programming instructions)
•Additional working key fob (if available)

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Solution

If your Toyota Highlander's key fob is not working, follow these detailed steps to diagnose and potentially solve the issue.

Step 1: Check the Battery

Tools Required:

Small Phillips screwdriver (if necessary to open the fob)
Replacement battery (CR2032 or CR2025, depending on the fob)

Inspect the Fob:
- Look for visible damage or worn buttons.
- If the fob is physically intact, proceed to the next step.
Open the Key Fob:
- Use a small Phillips screwdriver or a flathead screwdriver to gently pry open the fob.
- Be careful not to damage the casing.
Inspect and Replace the Battery:
- Remove the old battery and check for corrosion or leakage.
- Insert a new battery, ensuring the correct polarity (+/-) is followed.
- Reassemble the fob.

Step 2: Check for Interference

Tools Required:

None

Move to a Different Location:
- Key fob signals can be disrupted by electronic devices, metal structures, or other radio signals.
- Try using the fob in an open area away from potential interference.

Step 3: Reprogram the Key Fob

Tools Required:

Vehicle owner's manual (for programming instructions)
Additional working key fob (if available)

Enter the Vehicle:
- Sit in the driver's seat with all doors closed.
Insert the Key:
- Insert the working key into the ignition and turn it to the "ON" position without starting the vehicle.
Programming Mode:
- If you have a second working key fob, you can program the non-working fob by turning the ignition to "OFF" and then back to "ON" multiple times (typically 5 times) until the vehicle lights flash, indicating programming mode.
Press a Button on the New Fob:
- Press any button on the key fob you wish to program. The vehicle lights will flash again indicating successful programming.

Repair Instructions

Step 4: Replace the Key Fob

If the above steps do not resolve the issue, it may be necessary to replace the key fob.

Purchase a New Key Fob:
- Obtain a new key fob from a Toyota dealership, authorized locksmith, or online retailer.
Program the New Key Fob:
- Follow the programming instructions provided with the new fob or refer to your vehicle's owner's manual for specific programming procedures for your model.
Test the New Key Fob:
- Once programmed, test all functions of the new key fob (lock/unlock doors, panic button, remote start).

Summary

By following these steps, you should be able to diagnose and potentially resolve the issue with your Toyota Highlander key fob. If the problem persists after replacing the battery and reprogramming, it may require professional assistance or a visit to a Toyota dealership.