Toyota Highlander Fourth Generation (2020-present) key fob not working how to fix

Toyota Highlander Fourth Generation (2020-present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

491 words

Problem Statement

Learn how to diagnose and fix a non-working key fob for Toyota Highlander (2020-present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' or 'Neutral' and the engine is off before starting repairs.

Symptoms

•Key fob buttons unresponsive
•Vehicle does not respond to key fob signals
•Warning light on the dashboard indicating a key fob issue
•Battery drain in the key fob
•Difficulty starting the vehicle (if fob is used for push-to-start)

Diagnostic Steps

1
Check the key fob battery by opening the fob and inspecting the battery condition.
2
Test the key fob signal using an OBD-II scanner or key fob tester.
3
Inspect the vehicle's keyless entry system for any fault codes using an OBD-II scanner.
4
Verify if a spare key fob works to rule out issues with the vehicle's receiver.
5
Check for any physical damage to the key fob casing or buttons.

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
•Replacement battery

Parts Required

•Key fob battery (commonly CR2032)

Related Faults

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Diagnostic Steps

1
Check the key fob battery by opening the fob and inspecting the battery condition.
2
Test the key fob signal using an OBD-II scanner or key fob tester.
3
Inspect the vehicle's keyless entry system for any fault codes using an OBD-II scanner.
4
Verify if a spare key fob works to rule out issues with the vehicle's receiver.
5
Check for any physical damage to the key fob casing or buttons.

Solution

1. Preparation

Gather tools: small screwdriver (for fob opening), multimeter (to test battery), replacement battery (if needed).
Ensure the vehicle is in a safe, well-lit area and the engine is off.

2. Replace Key Fob Battery

Open the Key Fob:
- Use a small screwdriver to gently pry open the key fob casing.
Remove the Old Battery:
- Take note of the battery orientation and carefully remove the old battery.
Install New Battery:
- Insert a new battery (commonly CR2032) in the same orientation as the old one.
Reassemble the Key Fob:
- Snap the key fob casing back together firmly.

3. Reprogram the Key Fob (if necessary)

Enter Programming Mode:
- Sit in the driver's seat with all doors closed. Insert the key into the ignition and turn it to the "ON" position without starting the engine.
Cycle the Door Locks:
- Press the unlock button on the driver's door three times while turning the key from "ON" to "OFF" in between each press.
Add Key Fob:
- Press any button on the key fob to program it. The vehicle should respond by locking and unlocking the doors.
Exit Programming Mode:
- Turn the ignition key to "OFF" and remove it. Test the key fob for functionality.