how do I fix the key fob not working on my Toyota Highlander Fourth Generation (2020-present)?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

529 words

Problem Statement

Learn how to diagnose and fix a non-working key fob for your 2020-present Toyota Highlander. Step-by-step guide with symptoms and solutions.

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 turned off before attempting repairs.

Symptoms

•Key fob buttons do not respond
•Vehicle does not unlock or lock remotely
•Engine does not start when key fob is inside
•Warning light on the dashboard indicating key fob issue
•Weak signal for remote entry

Diagnostic Steps

1
Check the battery level of the key fob by inspecting the battery compartment.
2
Replace the key fob battery if it appears weak or dead.
3
Verify the key fob's proximity to the vehicle while attempting to unlock/start.
4
Attempt to start the vehicle using the emergency key blade if available.
5
Scan the vehicle for error codes using an OBD-II scanner to check for related issues.
6
Inspect the key fob for physical damage or water ingress.

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 key fob battery

Related Faults

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Diagnostic Steps

1
Check the battery level of the key fob by inspecting the battery compartment.
2
Replace the key fob battery if it appears weak or dead.
3
Verify the key fob's proximity to the vehicle while attempting to unlock/start.
4
Attempt to start the vehicle using the emergency key blade if available.
5
Scan the vehicle for error codes using an OBD-II scanner to check for related issues.
6
Inspect the key fob for physical damage or water ingress.

Solution

1. Preparation

Gather necessary tools: flathead screwdriver, small Phillips screwdriver, and a new key fob battery (CR2032).
Ensure you are in a well-lit area and have the vehicle parked securely.

2. Replace the Key Fob Battery

Open the Key Fob:
- Insert a flathead screwdriver into the seam of the key fob and gently pry it open.
- Use caution to avoid damaging the casing.
Remove the Old Battery:
- Locate the battery inside the fob and note its orientation.
- Carefully remove the old battery using the screwdriver or your fingers.
Install the New Battery:
- Place the new battery (CR2032) into the compartment, ensuring it is oriented the same way as the old one (positive side facing up).
- Press down firmly to ensure proper contact.
Reassemble the Key Fob:
- Align the two halves of the fob and press them together until they click into place.
- Ensure there are no gaps between the halves.

3. Reprogram the Key Fob (if necessary)

Enter Programming Mode:
- 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, then back to "Off" five times within 10 seconds.
Program the Key Fob:
- Remove the key from the ignition.
- Press the "Lock" button on the key fob for one second, then release it.
- Repeat this step for any additional key fobs to be programmed.
Exit Programming Mode:
- Turn the ignition to the "On" position to exit programming mode.