my Toyota Highlander Third Generation (2014-2019) key fob won’t unlock the doors, what should I do?

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

471 words

Problem Statement

Learn how to diagnose and fix key fob issues for Toyota Highlander 2014-2019. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always handle batteries with care; avoid contact with skin and dispose of old batteries properly.

Symptoms

•Key fob buttons unresponsive
•Vehicle doors not unlocking or locking
•Indicator light on the key fob not illuminating when pressed
•Occasional successful unlocks with proximity or manual key
•Possible 'key not detected' message on the dashboard

Diagnostic Steps

1
Check the key fob battery for corrosion or damage.
2
Replace the battery in the key fob and test its functionality.
3
Inspect the key fob for physical damage or water exposure.
4
Test the key fob using a second identical fob (if available).
5
Scan the vehicle’s computer system for any error codes related to the keyless entry system.
6
Verify the vehicle's keyless entry receiver is functioning by checking for any obstructions or wiring 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
•CR2032 replacement battery
•Multimeter

Parts Required

•CR2032 battery
•Keyless entry receiver

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Diagnostic Steps

1
Check the key fob battery for corrosion or damage.
2
Replace the battery in the key fob and test its functionality.
3
Inspect the key fob for physical damage or water exposure.
4
Test the key fob using a second identical fob (if available).
5
Scan the vehicle’s computer system for any error codes related to the keyless entry system.
6
Verify the vehicle's keyless entry receiver is functioning by checking for any obstructions or wiring issues.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is in a secure area.
Remove any jewelry or watches that could scratch the vehicle's interior.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver, CR2032 replacement battery
Sub-steps:
1. Locate the small notch on the key fob.
2. Use the flathead screwdriver to gently pry open the fob.
3. Remove the old battery and note the orientation.
4. Insert the new CR2032 battery in the same orientation.
5. Snap the key fob back together until secure.

3. Check Key Fob Functionality

Sub-steps:
1. Stand near the vehicle and press the unlock button on the key fob.
2. Observe if the vehicle responds by unlocking the doors.
3. If not, proceed to check the vehicle's keyless entry system.

4. Inspect Vehicle Receiver

Tools Required: Multimeter
Sub-steps:
1. Access the vehicle's keyless entry receiver (typically located under the dashboard or near the steering column).
2. Use the multimeter to check for power and ground at the receiver.
3. Repair any wiring issues or replace the receiver if it is faulty.