Learn how to program a new OEM key for BMW BDC3 modules using the KEYDIY KD-X4 programmer and specialized BDC03 clip. This step-by-step guide shows the complete process with visual references.
Required Tools and Equipment:
- Pre-soldered OEM key (pre-wired according to diagram)
- Smartphone with KD application installed
- KD-X4 5-in-1 key programming tool
- KEYDIY BDC03 Dismantling-free Clip
Step-by-Step Installation Guide:
Note: Two programming harnesses are used for demonstration clarity.
Step 1: Unpack the KEYDIY BDC03 Dismantling-free Clip
Remove the clip from its packaging and identify the four colored wires: orange, black, red, and brown.
Step 2: Connect Programming Cable Wires
Insert the programming cable wires into the corresponding colored ports on the clip.
Step 3: Proper Wire Connection Technique
Begin by activating all four switches on the clip. Connect the wires in sequence: orange, black, red, then brown.
Important: For optimal contact, slightly expose the wire ends before insertion. Poor connections may result in reading failures.
Step 4: Prepare Original Vehicle Key
Remove the back cover from the original car key. Securely attach the BMW BDC3 Specific Dismantling-free Clip onto the key.
Step 5: Initialize KD-X4 Device
Power on the KD-X4 programming device. Launch the KD application on your mobile device.
Navigate to "Bluetooth settings" and select "KD Remote control device" to establish connection with the KDX4 unit.
After successful pairing, return to the application's main interface.
Step 6: Access Immobilizer Programming
Select "IMMO Programming," choose BMW, then "Select by Type." Pick "G/U Chassis BDC3 BCP anti-theft system" and tap "Start execution."
Step 7: Verify Wiring Configuration
Consult the key wiring diagram if necessary. Ensure the BDC3 Clip is properly attached and the OEM key is correctly connected.
Critical Note: The OEM key must be pre-soldered—direct reading attempts will not succeed.
Step 8: Add New Key
Return to the previous menu, select "Add Key," then confirm by tapping "OK."
Choose "G Chassis/BDC3 Clone" to proceed with the key programming process.
Step 9: Read Chip Data
Connect the programming harness attached to the original car key into the KD-X4 programmer. Select "Read Chip Data" and confirm the action.
Chip data reading completed successfully.
Step 10: Write Data to New Key
Connect the target OEM key that will receive the programmed data. Select "Original Key (Non-Vehicle)" and confirm your selection.
Data generation process completed successfully.
Completion: The BMW BDC3 PCB is now successfully programmed using the KEYDIY KD-X4 system and BDC03 dismantling-free clip. The key is ready for installation into its casing and immediate use with your vehicle.
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