BMW 5 Series Owners & Service Manuals

BMW 5 Series: Lateral and longitudinal acceleration sensor, B-pillar

BMW 5 Series G30 2016-2024 Training Manual / Passive Safety Systems / System Components / Lateral and longitudinal acceleration sensor, B-pillar

The lateral and longitudinal acceleration sensors assist with the identification of head-on crashes, side-on crashes and rear-end crashes.

The airbag sensor consists of a longitudinal acceleration sensor and a lateral acceleration sensor.

The acceleration sensors measure the positive and negative acceleration in the X and Y direction. The result from the X and Y signals is decisive in identifying the direction of the crash. The airbag sensors on the left and right are of identical design and are allocated by way of mechanical encoding during installation.

System Components
G30 Lateral and longitudinal acceleration sensor

Door airbag sensor (pressure)

In the G30, pressure sensors are installed in the driver's door and front passenger door. The airbag sensor in the doors are no longer secured with a screw as was previously the case. The airbag sensor are screwed into the bracket. The electrical attachment elements resp. the plug connections can only be connected after installation of the respective sensors.

Side crashes are identified with the assistance of the airbag sensors. In addition to the lateral acceleration values that are present, the pressure in the door cavity also increases in the event of a side-on crash.

The airbag sensors in the doors are used to verify the plausibility of the acceleration signals from the B-pillar airbag sensors and the Advanced Crash Safety Module (ACSM) when a side-on crash is detected. The airbag sensors are situated in the inner panel of the doors and measure the pressure increase in the event of a side-on collision. In the event of a side-on collision at the door the outer skin is pushed inwards. The door interior is reduced in size and the inner pressure increases. This pressure change is measured by the airbag sensors. The airbag sensor also includes electronics, in addition to the pressure sensor, that digitise the pressure readings and transmit them cyclically to the Advanced Crash Safety Module (ACSM). The data transfer is effected analogue to the airbag sensors in the B- pillars. The pressure readings are evaluated in the Advanced Crash Safety Module (ACSM).

System Components
G30 Door airbag sensor (pressure)


     Airbag front sensor

    Two airbag front sensors are installed in the front area of the engine supports. The measured values are forwarded to the Advanced Crash Safety Module (ACSM) where they are evaluated. The airbag fr

     Seat belt buckle switch

    The seat belt buckle switches are located in the seat belt buckles of the driver and front passenger seat. European version vehicles are additionally equipped with seat belt buckle switches on the r


    Overview The following actuators are installed in the G30: Two-stage driver's airbag Two-stage front passenger airbag Knee airbag on front left and right Head airbag on left and right Side airba



    On the G30 the 2-wire OABR Ethernet (OPEN Alliance BroadR-Reach) from the G12 is used. The Ethernet variant with 5 lines (4 data lines and 1 activation line) is still used on the G30 by the OBD2 interface to the Body Domain Controller. Use of 2-wire OABR Ethernet on the G30 The following control

     General information

    Video files and, depending on the vehicle equipment, video DVDs can be played. Sound is played back through the vehicle loudspeakers. Settings are stored for the driver profile currently used. The video image on the front Control Display is switched off when a country-dependent speed is exceeded.

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