my Tesla Model S Original (2012-2020) won't unlock remotely what to check

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

483 words

Problem Statement

Learn how to diagnose and fix the issue of your Tesla Model S key fob not unlocking the vehicle. 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

•Handle the key fob and its battery carefully to avoid short circuits.
•Ensure the vehicle is in a secure location while performing diagnostics.

Symptoms

•Key fob not functioning to unlock the doors
•Dashboard showing 'Key not detected' message
•Inability to use mobile app for remote access
•Physical key entry not working
•Battery drain in the key fob

Diagnostic Steps

1
Check the battery level of the key fob and replace if low.
2
Attempt to unlock the vehicle using the mobile app to determine if the issue is with the key fob.
3
Inspect the key fob for physical damage or water exposure.
4
Verify that the car's software is up to date.
5
Examine the central locking system for any mechanical faults.
6
Test the key fob's signal with a multimeter to check for functionality.

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 screwdriver
•Multimeter

Parts Required

•CR2032 battery

Related Faults

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Diagnostic Steps

1
Check the battery level of the key fob and replace if low.
2
Attempt to unlock the vehicle using the mobile app to determine if the issue is with the key fob.
3
Inspect the key fob for physical damage or water exposure.
4
Verify that the car's software is up to date.
5
Examine the central locking system for any mechanical faults.
6
Test the key fob's signal with a multimeter to check for functionality.

Solution

1. Preparation

Gather necessary tools: small screwdriver, new key fob battery (CR2032), multimeter, and a soft cloth.
Ensure the vehicle is in a safe location and that you have access to the key fob and mobile app.

2. Replace Key Fob Battery

Use a small screwdriver to carefully open the key fob case.
Remove the old battery and replace it with a new CR2032 battery, ensuring the positive side is facing up.
Snap the key fob back together securely.

3. Update Vehicle Software

Power on the vehicle and navigate to the main screen.
Go to "Software" settings and check for any available updates.
If an update is available, follow on-screen instructions to download and install it.

4. Test Central Locking Mechanism

Open the driver's side door manually.
Inspect the locking mechanism for any obstructions or mechanical failures.
Operate the locking mechanism manually to ensure it functions properly.

5. Reprogram Key Fob (if necessary)

In the vehicle, go to the “Controls” menu and select “Keys.”
Follow the prompts to add a new key fob if the current one is unresponsive.
Confirm the reprogramming process is successful.