How to Add BMW BDC2 Key by Launch X431 IMMO Tablet on Bench?

Both Launch X431 IMMO series ( IMMO Plus / IMMO Elite / IMMO PAD / IMMO Pro) and X431 PAD series tablets (PAD V, PAD VII, PAD9 LINK) support BMW G chassis BDC2 key adding. The X431 X-Prog3 and MCU3 Adapter are required to work with the X431 tool. Here we’ll walk through X431 IMMO PRO to demonstrate the operation guide on a 2019 BMW G series car.

Requirements:

• Update BMW/Mini software to version V10.40 or later version
• Need at least one original key
• Connect network via USB (do not use Bluetooth)

Note:

Adding a BDC2 key is a complex process.

Please follow the operation guide below strictly to make the operation successfully.

Main Steps:

Step 1: Read ECU Information

Step 2: Detect version

Step 3: Back up codes

Step 4: Pre-processing

Step 5: Generate Dealer Key

In detail…

Step 1: Read ECU Information

Navigate to the BMW/Mini IMMO software (e.g. BMW V10,40)

Connect the Launch X431 IMMO tablet to the vehicle using X431 X-Prog3

Select Anti-theft key matching -> BDC02 IMMO System

Read the on-screen instruction

Select “ECU information” to read the ECU information and confirm it is correct

Step 2: Detect version

Select “Version Detection” to detect the software version.

If supported, continue with coding data backup.

If not supported, exit the operation.

Step 3: Back up codes

Select Encoding Operation-> Backup Codes

Enter the file name to save the coding data

Backup the coding data successfully

Step 4: Pre-processing

Disassemble the BDC2 module from the vehicle

Select Programming Operation-> Read-out Preprocessing

Ensure the following setup:

• At least one original key required
• Connect X-Prog3 Programmer, MCU3 adapter, and BC cable
• Use USB connection for stable data transfer (large file size)
• Launch X431 will display a connection diagram

Connection Points:

• Disconnect and reconnect EEPROM Pin2 multiple times, use the wires to operate
• Connect the 8-foot chip 25LC256 pin 2
• Connect RESET PIN to the MCU

Connect BC cable harness to ECU

Keep idle harness away from ECU to avoid damage

Connect an external 12V power supply to Launch X431 MCU3 Adapter (do not exceed 12V)

In Case of Failure during Operation:

Disconnect 12V power supply

Disconnect MCU RESET and EEPROM PIN2 connections

Reconnect 12V power to retry

If SWFL version is lost, use Programming Restore to recover

Back Up and Restore:

Disconnect EEPROM PIN2 and the harness GND, pay attention to anti-static during operation, and only touch the insulated part.

Back up CAFD coding data

Connect EEPROM PIN2 and the harness GND, pay attention to anti-static during operation, and only touch the insulated part

Disconnect EEPROM PIN2 and GND as instructed

Note: MUST follow every disconnect/connect PIN2 and GND operation.

Read the anti-theft data, and update ECU

Pre-processing succeeded

Choose the original coding back to BDC2

CAFD code recovery is successful

Step 4: Generate Dealer Key

Disconnect MCU Reset and X-Prog3 from B8

Read the original vehicle key and generate a dealer key, and then restore the BDC2 module and install it in the vehicle.

You can also restore the BDC2 module and install it in the vehicle, and then read the original vehicle key and generate the key

After module installation:

Check central control time display

Ensure automatic mirror folding works; adjust manually if needed

After that, select Key Operation → Read Original Vehicle Key

Place the working key into the X-Prog3 key programmer to read info.

Select “Generate Dealer Key”

Choose one unused key position

Put the new key into Launch X431 X-Prog3 to program

Confirm the dealer key is generated successfully

Finally, install BDC2 module, and use emergency sensing area under steering wheel to activate the new key

Start the vehicle and test remote control functionality

Done!