In this guide, we’ll walk through the process of performing an add key procedure on a 2015 BMW X3 using the Xhorse VVDI Key Tool Plus. This includes unlocking the CAS4+ module, reading the ISN number, and programming a new dealer key. Proper voltage maintenance and attention to detail are critical for success.
Tools and Preparation
Xhorse VVDI Key Tool Plus (KTP)
Battery maintainer (recommended voltage: 13V or higher)
- Original key
New blank key
Working internet connection (for data transfer)
Important Note: Ensure the vehicle battery voltage remains above 13V during the entire process. Operating at 12V or lower risks failure or module damage.
Step-by-Step Procedure
1. Read Vehicle Information
Connect the Key tool plus to the OBD port.
Turn on the ignition and scan the vehicle to retrieve the VIN and confirm the CAS4+ system.
Verify the displayed information before proceeding.
2. Unlock the CAS4+ Module
Save the module data file before starting the unlock process.
Follow the tool prompts to transfer and receive data. This step may take time; avoid interrupting the process.
Tip:
For stability, perform this step on a bench if possible. If using OBD, ensure a stable power supply and internet connection.
3. Read the ISN Number
Insert the original working key (if available) into the key reader coil.
Select the option to read the ISN from the key. The tool will display the ISN number.
Record the ISN for future reference.
Alternative:
If no working key is available, the ISN can also be read from the engine control module (ECM).
4. Prepare and Program the New Dealer Key
Navigate to the “Prepare Dealer Key” option in the tool.
Select the key position (e.g., key number 5 if slots 1 and 2 are already taken).
Choose the appropriate option (with working key or ISN, depending on availability).
Place the new key near the coil and follow the prompts to program it.
Key Learning:
Hold the new key close to the coil during programming.
Confirm the “Learn Successful” message before testing.
5. Test the New Key
Remove all other keys from the vehicle to avoid interference.
For the first start, hold the new key near the ignition coil and start the engine.
Verify that the engine starts and the remote functions (lock/unlock) work properly.
Important Tips
Voltage Stability: Always use a battery maintainer to keep voltage above 13V. Low voltage can cause failures.
Data Transfer: A strong internet connection ensures smooth communication with the server during CAS unlocking.
Key Positioning: Proper placement of the key on the coil is critical for successful programming.
Backup Data: Save all module data files before making changes for recovery purposes.
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