Siemens | Bsm B3 Schematic

The core is a PCB (Printed Circuit Board) populated with drivers that command the relays. In many Siemens-manufactured units, this board is encased in a protective gel or resin compound to guard against moisture, which requires chemical removal (such as isopropyl alcohol) for repairs.

The Siemens BSM B3 is a body control / smart module used on various vehicles (controls lighting, locks, convenience functions). The schematic shows power, ground, inputs (switches, sensors), outputs (relays, lamps, actuators), and communication lines (CAN, LIN). siemens bsm b3 schematic

For those maintaining or retrofitting older Siemens servo systems, finding accurate documentation for the can often be a challenge. The core is a PCB (Printed Circuit Board)