why does my Toyota Highlander Third Generation (2014-2019) key fob not work?

Toyota Highlander Third Generation (2014-2019)

Error Codes

30 minutes

Time

medium

Difficulty

medium

Severity

2 min read

395 words

Problem Statement

Learn how to diagnose and fix a non-functioning key fob for Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, and solutions.

Affected Component

Electrical

Estimated Time

30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Take care when using tools to avoid injury or damage to the key fob.

Symptoms

•Key fob buttons unresponsive
•Inability to unlock/lock the vehicle remotely
•Engine not starting with the key fob present
•Warning lights on the dashboard (e.g., key symbol)
•Reduced range for key fob operation

Diagnostic Steps

1
Check the battery condition of the key fob using a multimeter.
2
Replace the battery in the key fob and test for functionality.
3
Inspect the key fob for physical damage or water exposure.
4
Verify if the vehicle's keyless entry system is functioning by using the manual key.
5
Scan the vehicle’s onboard diagnostics (OBD-II) for related error codes.
6
Test the key fob with another vehicle (if available) to rule out key fob failure.

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
Check the battery condition of the key fob using a multimeter.
2
Replace the battery in the key fob and test for functionality.
3
Inspect the key fob for physical damage or water exposure.
4
Verify if the vehicle's keyless entry system is functioning by using the manual key.
5
Scan the vehicle’s onboard diagnostics (OBD-II) for related error codes.
6
Test the key fob with another vehicle (if available) to rule out key fob failure.

Solution

1. Preparation

Gather necessary tools: small screwdriver, replacement battery (typically CR2032), and a multimeter.
Ensure the vehicle is parked in a safe area with enough space.

2. Replace Key Fob Battery

Use the small screwdriver to gently pry open the key fob casing.
Carefully remove the old battery, noting its orientation.
Insert the new battery (CR2032), ensuring the positive side is facing up.
Reassemble the key fob casing securely.

3. Reprogram Key Fob (if required)

Sit in the driver's seat and close all doors.
Insert the key into the ignition and turn it to the "ON" position without starting the engine.
Press the "LOCK" button on the key fob within 5 seconds.
Turn the ignition off and remove the key.
Test the key fob to ensure it functions correctly.