how to troubleshoot 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

528 words

Problem Statement

Learn how to troubleshoot and fix a non-working key fob for the 2014-2019 Toyota Highlander. 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 turned off and in park before working on the key fob.

Symptoms

•Key fob buttons do not respond when pressed
•Vehicle does not unlock automatically when approaching
•Dashboard indicator light for key fob is illuminated
•No response when attempting to start the vehicle with the key fob
•Check key fob battery warning message displayed on the dashboard

Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Replace the key fob battery with a new, compatible battery.
3
Test the key fob functionality using a multimeter to check for continuity in the buttons.
4
Check the vehicle's battery voltage to ensure it is sufficient (12.4V or higher).
5
Reprogram the key fob to the vehicle if it is not detected.
6
Scan the vehicle's computer for any related error codes using an OBD-II scanner.

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

•Replacement battery (CR2032)
•Small flathead screwdriver
•Multimeter

Parts Required

•Key fob battery (CR2032)

Related Faults

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Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Replace the key fob battery with a new, compatible battery.
3
Test the key fob functionality using a multimeter to check for continuity in the buttons.
4
Check the vehicle's battery voltage to ensure it is sufficient (12.4V or higher).
5
Reprogram the key fob to the vehicle if it is not detected.
6
Scan the vehicle's computer for any related error codes using an OBD-II scanner.

Solution

1. Preparation

Tools Required: Replacement battery (CR2032), small flathead screwdriver, multimeter.
Safety Warnings: Ensure the vehicle is turned off and in park before working on the key fob.

2. Replace the Key Fob Battery

Open the key fob using a small flathead screwdriver by gently prying apart the two halves.
Remove the old battery from the fob.
Insert the new battery with the positive side facing up.
Snap the two halves of the key fob back together securely.

3. Test Key Fob Functionality

Use a multimeter set to continuity mode.
Press each button on the key fob while probing the connection points on the circuit board.
If continuity is not present when a button is pressed, the key fob may need to be replaced.

4. Check Vehicle Battery Voltage

Open the hood and connect a multimeter to the vehicle's battery terminals (red to positive, black to negative).
Ensure the battery voltage reads 12.4V or higher. If it is below this, charge or replace the vehicle battery.

5. Reprogram the Key Fob

Sit inside the vehicle and close all doors.
Insert the key into the ignition and turn it to the "ON" position (do not start the engine).
Press the "Lock" button on the key fob and turn the key to "OFF" and then back to "ON" again within 5 seconds.
Repeat this process a few times until the locks cycle, indicating successful reprogramming.