my Toyota Highlander Third Generation (2014-2019) won’t unlock with the remote what's happening

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

526 words

Problem Statement

Learn how to diagnose and fix the key fob not unlocking issue in Toyota Highlander (2014-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is off and in a secure position before working on the key fob and electrical components.

Symptoms

•Remote key fob not responding to unlock command
•Physical key entry works, but remote does not
•Indicator lights on the key fob do not illuminate
•Possible dashboard warning light for the keyless entry system is illuminated
•Lock/unlock button on the door handle is unresponsive

Diagnostic Steps

1
Replace the battery in the remote key fob to rule out battery failure.
2
Inspect the key fob for physical damage or wear, particularly the buttons.
3
Test the key fob signal using a multimeter or a second vehicle to check if it transmits correctly.
4
Check the vehicle's fuse for the keyless entry system to ensure it is not blown.
5
Scan the vehicle’s computer system for any diagnostic trouble codes (DTCs) related to the keyless entry system.

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

•Screwdriver
•Multimeter
•Fuse puller

Parts Required

•CR2032 key fob battery

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Diagnostic Steps

1
Replace the battery in the remote key fob to rule out battery failure.
2
Inspect the key fob for physical damage or wear, particularly the buttons.
3
Test the key fob signal using a multimeter or a second vehicle to check if it transmits correctly.
4
Check the vehicle's fuse for the keyless entry system to ensure it is not blown.
5
Scan the vehicle’s computer system for any diagnostic trouble codes (DTCs) related to the keyless entry system.

Solution

1. Preparation

Gather tools: screwdriver, multimeter, new key fob battery (CR2032), and a fuse puller.
Ensure the vehicle is parked safely and the ignition is off.

2. Replace Key Fob Battery

Open the key fob using a small screwdriver to pry apart the casing gently.
Remove the old battery and insert the new CR2032 battery, ensuring correct polarity (+/-).
Reassemble the key fob and test it to see if the remote works.

3. Inspect Key Fob

Check for any visible signs of damage on the fob, including cracks or broken buttons.
If damaged, consider replacing the key fob entirely.

4. Check Fuses

Locate the fuse box, usually found under the dashboard or in the engine compartment.
Identify the fuse for the keyless entry system (refer to the owner’s manual for the exact location).
Inspect the fuse; if blown, replace it with a fuse of the same amperage.

5. Reprogram Key Fob (if necessary)

If the key fob is still unresponsive, you may need to reprogram it. Insert the key into the ignition and turn it to the "ON" position (do not start the engine).
Press the unlock button on the key fob for 5 seconds, then turn the key to the "OFF" position.
Repeat this process twice, then test the key fob again.