Satellite Sensors

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The satellite sensors are mounted below the driver's and passenger's front seats on the vehicle floor pan. The function of the sensors is to detect the severity of side impacts and signal the MRS III control module, through a pulse modulated signal, in the event of a crash. The control module uses this input signal along with its internal impact sensor signal to determine the deployment of the side/head airbags.

The satellite sensors of the MRS III use only two wires over the previous three wire sensors of the MRS II. The signal is received by the MRS III control unit over the reference voltage supply wire.

As with the control modules, the satellite sensors are manufacturer specific. The Temic sensors will not interchange with the Bosch sensors.

Fig 1: Identifying Satellite Sensors

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: View Of MRS III Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.