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

Toyota Highlander Third Generation (2014-2019)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

485 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 repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle battery before working on electrical components to avoid short circuits.

Symptoms

•Key fob buttons unresponsive
•Vehicle does not respond to key fob commands
•Dashboard warning light for key fob or security system illuminated
•Key fob physically damaged or worn
•Battery low indicator or dead battery in the fob

Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Inspect the key fob for physical damage or corrosion.
3
Replace the key fob battery and test the fob functionality.
4
Scan the vehicle’s onboard computer for any relevant DTCs (Diagnostic Trouble Codes).
5
Attempt to reprogram the key fob using the vehicle's onboard programming procedure.

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 Phillips screwdriver
•Flat-head screwdriver
•Multimeter

Parts Required

•CR2032 battery

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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 corrosion.
3
Replace the key fob battery and test the fob functionality.
4
Scan the vehicle’s onboard computer for any relevant DTCs (Diagnostic Trouble Codes).
5
Attempt to reprogram the key fob using the vehicle's onboard programming procedure.

Solution

1. Preparation

Gather tools: small Phillips screwdriver, flat-head screwdriver, multimeter.
Ensure you have a replacement battery (CR2032) for the key fob.
Disconnect the vehicle battery if necessary to prevent any electrical issues.

2. Open the Key Fob

Use a flat-head screwdriver to gently pry apart the key fob casing.
Carefully separate the two halves of the key fob to avoid damaging internal components.
Note the orientation of the battery for correct installation later.

3. Replace the Battery

Remove the old battery from the key fob. Dispose of it properly.
Insert the new CR2032 battery, ensuring the correct polarity (+ side facing up).
Reassemble the key fob, making sure it clicks securely back into place.

4. Test the Key Fob

Stand near the vehicle and press the unlock button to test if it functions correctly.
If the fob still doesn’t work, proceed to reprogram the key fob.

5. Reprogram the Key Fob (if necessary)

Insert the key into the ignition and turn it to the "On" position (do not start the engine).
Within 5 seconds, turn the key back to the "Off" position and remove it.
Press and hold the “Lock” button on the key fob for approximately 5 seconds.
Try to unlock the vehicle with the key fob to confirm successful programming.