how to troubleshoot my Toyota Highlander Third Generation (2014-2019) key fob not working

Toyota Highlander Third Generation (2014-2019)

Error Codes

30-60 minutes

Time

medium

Difficulty

medium

Severity

3 min read

477 words

Problem Statement

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

Affected Component

Electrical

Estimated Time

30-60 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' and has the ignition off before working on the key fob.

Symptoms

•Key fob buttons do not respond when pressed
•Vehicle does not unlock or lock remotely
•Engine does not start with the key fob present
•Warning light on the dashboard indicating a key fob issue
•Key fob is physically damaged or worn

Diagnostic Steps

1
Inspect the key fob for physical damage, such as cracks or water damage.
2
Check the battery in the key fob; replace if necessary.
3
Test the key fob's signal using a spare key fob if available.
4
Scan the vehicle's onboard computer for error codes related to the keyless entry system.
5
Verify the vehicle's battery and electrical systems are functioning correctly.

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

•Flathead screwdriver
•Small Phillips screwdriver

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Inspect the key fob for physical damage, such as cracks or water damage.
2
Check the battery in the key fob; replace if necessary.
3
Test the key fob's signal using a spare key fob if available.
4
Scan the vehicle's onboard computer for error codes related to the keyless entry system.
5
Verify the vehicle's battery and electrical systems are functioning correctly.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure all safety measures are followed, including wearing gloves and working in a well-lit area.

2. Inspect and Replace Key Fob Battery

Tools Required: Flathead screwdriver, small Phillips screwdriver
Open the key fob by gently prying it apart using a flathead screwdriver.
Remove the old battery, noting the orientation (positive side facing up).
Insert a new battery (typically CR2032) in the same orientation.
Reassemble the key fob securely.

3. Reprogram Key Fob (if necessary)

Tools Required: None
Sit in the vehicle and close all doors.
Insert the key into the ignition and turn it to the "ON" position without starting the engine.
Turn the key back to "OFF" and remove it.
Press the "lock" button on the key fob five times within 30 seconds.
The doors will lock and unlock to confirm successful programming.

4. Test Key Fob Functionality

Tools Required: None
Stand outside the vehicle and attempt to lock and unlock the doors using the key fob.
Try starting the vehicle with the key fob inside.