how to troubleshoot the key fob not working for my Toyota Highlander XU70 (2020-Present)?

Toyota Highlander XU70 (2020-Present)

Error Codes

30 minutes

Time

medium

Difficulty

medium

Severity

3 min read

403 words

Problem Statement

Learn how to troubleshoot and fix a non-working key fob for your 2020-present Toyota Highlander XU70. Step-by-step guide with diagnostic and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in the OFF position before working on or inspecting electrical components.

Symptoms

•Key fob buttons unresponsive
•Vehicle not detecting key fob proximity
•Key not detected warning on dashboard
•Inconsistent operation of key fob (works intermittently)
•Battery low warning for the key fob (if applicable)

Diagnostic Steps

1
Inspect the key fob for physical damage, including cracks or signs of water exposure.
2
Replace the key fob battery and verify battery orientation.
3
Check for any interference from electronic devices or metal objects in proximity to the key fob.
4
Attempt to start the vehicle with the backup key blade, if available.
5
Use an OBD-II scanner to check for any related trouble codes that may indicate a communication issue.

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
•Soft cloth

Parts Required

•Replacement battery (CR2032)

Related Faults

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Diagnostic Steps

1
Inspect the key fob for physical damage, including cracks or signs of water exposure.
2
Replace the key fob battery and verify battery orientation.
3
Check for any interference from electronic devices or metal objects in proximity to the key fob.
4
Attempt to start the vehicle with the backup key blade, if available.
5
Use an OBD-II scanner to check for any related trouble codes that may indicate a communication issue.

Solution

1. Preparation

Gather required tools: small flathead screwdriver, replacement battery (CR2032), and a soft cloth.
Ensure the vehicle is in a safe environment.

2. Replace Key Fob Battery

Sub-steps:
1. Use the small flathead screwdriver to gently pry open the key fob casing along the seam.
2. Remove the old battery, noting its orientation (positive side facing up).
3. Insert the new battery (CR2032) in the same orientation.
4. Snap the key fob casing back together securely.

3. Reprogram Key Fob (if necessary)

Sub-steps:
1. Enter the vehicle and close all doors.
2. Insert the key fob into the ignition and turn to the "ON" position without starting the engine.
3. Press the "LOCK" button on the fob within 5 seconds to initiate programming mode.
4. Turn the ignition off and remove the key fob. Test the key fob functions.