Lonsdor BM3S-02 BM3S Smart Key PCB for BMW G Chassis BDC2 / BDC3

The Lonsdor BM3S‑02 (part of the BM3S series) is an aftermarket smart key PCB (printed circuit board) designed for use with BMW G‑Series vehicles that use BDC2 or BDC3 immobilizer systems. It isn’t a complete key — it’s the internal electronic PCB that, when programmed and paired with the correct shell and battery, becomes a working smart key.

Key Features & Compatibility

• BMW G‑Chassis Support: Designed for vehicles with BDC2 and BDC3 immobilizer systems — common on many 2020–2024 BMW models like the 2/3/4/5/6/7/8 Series and various X‑Series models.

• Aftermarket Component: This PCB is not an OEM (dealer) key — it’s an aftermarket PCB that must be programmed to your specific vehicle with the right key programming tool.

• Requires Programming Tool: Works with Lonsdor programming devices such as K518 Pro, K518 FCV, KW100, etc. It needs to be programmed using a Lonsdor‑compatible tool to generate valid key data.

• Battery & Shell: The PCB typically goes into a BMW‑style key shell and uses a CR2032 battery (battery usually not included).