This guide demonstrates how to clone a Vauxhall/Opel GM BCM (Body Control Module) with part number 13589056 using OBDSTAR DC706, including immobilizer data transfer and PIN code extraction. This process is essential when replacing a faulty BCM while retaining original vehicle security data.
Tools Required
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P004 adapter
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12V power supply (for bench testing)
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Replacement BCM (same part number)
Step 1: Prepare the BCMs
Identify Modules:
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Locate the original (donor) BCM and the new replacement BCM (ensure part numbers match).
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Verify both are Continental-branded modules (common for GM/Opel).
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Pinout Setup:
Select GM BCM Continental 70F3469 +95160 option.
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Refer to the wiring diagram for correct connections:
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Pin 1: Ground (GND)
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Pins 4 & 5: 12V Power
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Pins 23 & 24: CAN Low/CAN High
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Step 2: Read Data from the Original BCM
Power Up:
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Connect the original BCM to the OBDStar DC706 tool using the wiring harness.
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Apply 12V power to Pins 4/5 and ground to Pin 1.
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Extract Data:
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Open the OBDStar software, navigate to GM > Body Control.
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Select “Read EEPROM” and save eeprom data.
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Select “Read Flash” to back up the flash data.
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Retrieve the PIN code (e.g., 0427 in this case) and note it down.
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Step 3: Write Data to the New BCM
Switch Modules:
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Disconnect the original BCM and connect the new BCM using the same wiring.
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Transfer Data:
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In OBDStar, select “Write EEPROM” and load the saved backup file.
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Select “Write Flash” to transfer the firmware.
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Note: Skip backup for brand-new modules (no existing data to preserve).
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Verify PIN Code:
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Read the PIN code from the new BCM to confirm it matches the original
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Step 4: Final Checks
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Disconnect all wiring and power.
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Test the cloned BCM in the vehicle:
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Ensure the immobilizer recognizes the keys.
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Check for fault codes (clear if necessary).
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Done.