why does my Toyota Highlander Third Generation (2014-2019) key fob intermittently stop working

Toyota Highlander Third Generation (2014-2019)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

479 words

Problem Statement

Learn how to diagnose and fix intermittent key fob issues in Toyota Highlander (2014-2019). 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 and all doors are closed during programming steps.

Symptoms

•Key fob buttons not responding intermittently
•Difficulty in starting the vehicle using keyless entry
•Warning lights on the dashboard related to the key fob or immobilizer system
•Unresponsive trunk release
•Reduced range for key fob operation

Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Inspect the key fob for physical damage or wear.
3
Reprogram the key fob using the vehicle's onboard system or a professional tool.
4
Test the key fob in close proximity to the vehicle to rule out range issues.
5
Scan the vehicle’s computer for error codes related to the keyless entry system.
6
Inspect the vehicle's antenna and receiver for damage or interference.

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

•Multimeter
•Small flathead screwdriver

Parts Required

•CR2032 battery

Related Faults

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Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Inspect the key fob for physical damage or wear.
3
Reprogram the key fob using the vehicle's onboard system or a professional tool.
4
Test the key fob in close proximity to the vehicle to rule out range issues.
5
Scan the vehicle’s computer for error codes related to the keyless entry system.
6
Inspect the vehicle's antenna and receiver for damage or interference.

Solution

1. Battery Replacement

Gather Tools: Small flathead screwdriver, new CR2032 battery.
Open Key Fob:
- Use the screwdriver to pry open the key fob casing.
- Be careful not to damage the plastic clips.
Replace Battery:
- Remove the old battery and insert the new CR2032 battery, ensuring correct polarity (+/-).
Reassemble Fob:
- Snap the fob casing back together securely.

2. Reprogramming the Key Fob

Preparation:
- Ensure all doors are closed and the vehicle is in park.
Insert Key:
- Insert the key into the ignition and turn it to the "ON" position without starting the engine.
Press Buttons:
- Press and hold the "LOCK" button on the key fob for approximately 5 seconds.
Turn Off Ignition:
- Turn the ignition off and remove the key.
Test Key Fob:
- Test the key fob for functionality.

3. Antenna and Receiver Check

Locate Antenna:
- Refer to the service manual to find the location of the keyless entry antenna.
Inspect Antenna:
- Check for any visible damage or loose connections.
Repair or Replace:
- Tighten any loose connections or replace the antenna if necessary.