my Toyota Highlander XU70 (2020-Present) key fob won't unlock doors what can I try

Toyota Highlander XU70 (2020-Present)

Error Codes

20-30 minutes

Time

medium

Difficulty

medium

Severity

3 min read

513 words

Problem Statement

Learn how to troubleshoot and fix key fob issues for your 2020-Present Toyota Highlander XU70. Step-by-step guide with diagnostic steps and solutions.

Affected Component

Electrical

Estimated Time

20-30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' and the ignition is off while working on the key fob

Symptoms

•Key fob buttons are unresponsive
•Door locks do not respond to the key fob
•Indicator light on the key fob does not illuminate when pressed
•Battery symbol may appear on the dashboard if applicable
•Manual unlock works with the physical key

Diagnostic Steps

1
Check the key fob battery for charge and replace if necessary
2
Inspect the key fob for physical damage or water exposure
3
Verify the vehicle's battery voltage to ensure it is not low
4
Reprogram the key fob using the vehicle’s manual instructions
5
Scan for any error codes related to the keyless entry system using an OBD-II scanner
6
Test the key fob in proximity to the vehicle to rule out distance issues

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 flathead screwdriver
•OBD-II scanner (optional)

Parts Required

•CR2032 battery

Related Faults

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Diagnostic Steps

1
Check the key fob battery for charge and replace if necessary
2
Inspect the key fob for physical damage or water exposure
3
Verify the vehicle's battery voltage to ensure it is not low
4
Reprogram the key fob using the vehicle’s manual instructions
5
Scan for any error codes related to the keyless entry system using an OBD-II scanner
6
Test the key fob in proximity to the vehicle to rule out distance issues

Solution

1. Preparation

Gather necessary tools: a small flathead screwdriver, a new battery (CR2032), and possibly an OBD-II scanner.
Ensure you are in a secure area to avoid losing the key fob or vehicle access.

2. Replace Key Fob Battery

Open the Key Fob:
- Use a small flathead screwdriver to gently pry open the key fob casing along the seam.
Remove Old Battery:
- Take out the old battery noting the orientation (positive side facing up).
Insert New Battery:
- Place the new CR2032 battery in the same orientation as the old one.
Reassemble Key Fob:
- Snap the two halves of the key fob back together until secure.

3. Reprogram Key Fob

Enter Program Mode:
- 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 Key Fob Buttons:
- Press and hold the "Unlock" button for 5 seconds.
- While holding the "Unlock" button, press the "Lock" button 3 times.
Complete Programming:
- Release the "Unlock" button. The doors should lock and unlock to confirm the programming is successful.