why does my Toyota Highlander Fourth Generation (2020-present) key fob not work after changing the b...

Toyota Highlander Fourth Generation (2020-present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

2 min read

354 words

Problem Statement

Learn how to troubleshoot and fix a non-working key fob after battery replacement for Toyota Highlander (2020-present). Step-by-step guide included.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Avoid using excessive force when opening the key fob to prevent damage to the internal components.

Symptoms

•Key fob buttons do not respond
•Vehicle does not unlock or lock with the key fob
•No LED light illumination on the key fob when pressed
•Key fob is unresponsive even when near the vehicle
•Possible 'Key Not Detected' warning on the vehicle's dashboard

Diagnostic Steps

1
Verify that the new battery is installed correctly with the correct polarity.
2
Check for any physical damage to the key fob housing or buttons.
3
Test the battery voltage using a multimeter to ensure it is within the correct range (typically around 3V for CR2032 batteries).
4
Reprogram the key fob according to the owner's manual instructions.
5
Inspect the vehicle's antenna or receiver unit to ensure it is functioning properly.

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 screwdriver
•Multimeter

Parts Required

•CR2032 battery

Related Faults

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Diagnostic Steps

1
Verify that the new battery is installed correctly with the correct polarity.
2
Check for any physical damage to the key fob housing or buttons.
3
Test the battery voltage using a multimeter to ensure it is within the correct range (typically around 3V for CR2032 batteries).
4
Reprogram the key fob according to the owner's manual instructions.
5
Inspect the vehicle's antenna or receiver unit to ensure it is functioning properly.

Solution

1. Preparation

Gather necessary tools: small screwdriver (for key fob), multimeter.
Ensure you have a new, compatible battery (typically CR2032).
Work in a clean, well-lit area.

2. Open Key Fob

Use a small screwdriver to gently pry apart the key fob casing.
Be cautious to avoid damaging any clips or inner components.

3. Replace Battery

Remove the old battery and discard it properly.
Insert the new battery, ensuring the correct polarity (+ and - signs match).
Confirm that the battery sits securely in its compartment.

4. Reassemble Key Fob

Align the two halves of the key fob casing.
Press together firmly until you hear a click, indicating it is sealed.

5. Reprogram Key Fob (if necessary)

Refer to the owner’s manual for specific programming instructions.
Generally, this may involve entering the vehicle, closing the doors, and following a sequence of button presses to sync the fob.

Tools Required:

Small screwdriver
Multimeter

Parts Required:

CR2032 battery (or compatible)

Estimated Repair Time: 30 minutes to 1 hour

Safety Warnings:

Avoid using excessive force when opening the key fob to prevent damage to the internal components.