Structure and inner electrical connection

The front passenger seat occupancy detection consists of:

• seat-occupancy mat with pressure sensors

  The seat occupancy mat consists of conductor paths and pressure sensors.

  • Seat occupancy detection for front passenger, European version (will gradually be replaced with a revised version beginning from 09/2010 for all series):

    The conductor paths are connected to the evaluation electronics in the electronic component.

  • Seat occupancy detection for front passenger, revised European version, which will gradually be replaced beginning from 09/2010 for all series):

    The conductor paths are connected in the Crash Safety Module (ACSM).

• Seat-occupancy mat with capacitive sensor system

  The capacitive sensor system integrated in the seat-occupancy mat is connected to the evaluation electronics in the electronic component.

• Electronic component

  In the electronic component, the sensor signals are processed, converted into digital signals and sent in cycles to the crash safety module. The data is transmitted via the LIN bus.

  Possible fault statuses of the front passenger seat occupancy detection are saved in the fault memory of the Crash Safety Module.

The seat occupancy mat is supplied with voltage by the crash safety module (ACSM). (ACSM stands for "Advanced Crash Safety Module", referred to as the "crash safety module").

The following graphic shows the seat occupancy detection for front passenger, European version (will gradually be replaced with a revised version beginning from 09/2010 for all series):

Fig 1: Seat Occupancy Mat With Pressure Sensors - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

The following graphic shows the seat occupancy mat with capacitive sensor system.

Fig 2: Seat-Occupancy Mat With Capacitive Sensor System - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

The following graphic shows the seat occupancy detection for front passenger, revised European version, which will gradually be replaced beginning from 09/2010 for all series.

Fig 3: Seat Occupancy Mat With Pressure Sensors - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.