Where are the front airbag sensors located?

[NotplayN]

Where are the front impact sensors (crash sensors) for the airbag on a 2001
x5 3.0

[spadge]

Tried to find them in the ETK but could'nt find them, maybe they are integrated into the airbag controll unit?

[Qsilver7]

Item #5 in the diagram below?
Multiple restraint systems MRS3 and MRS4
The multiple restraint systems MRS 3 and MRS4 consist of a control unit, two sensors for detecting a side-on crash, a sensor for detecting seat occupancy of the
passenger seat, and inflator assemblies for triggering the airbags.


The multiple restraint system MRS4 is a development of the MRS3 system.
Components Control unit
All inflator assemblies and sensors are connected to the MRS control unit. The control unit registers and evaluates the sensor data. In the event of a frontal or side-on collision, the internal control-unit logic decides whether airbag triggering is required and which airbags have to be triggered.


To detect crashes, the MRS control unit contains acceleration sensors that assess the accident situation based on occurring deceleration values. In the event of a side-on crash, the external side sensors (satellites) are also evaluated.

In addition to all inputs and outputs, the MRS control unit also monitors internal components. Possible fault statuses are stored in non-volatile form in the MRS control unit and indicated to the driver by means of the failure warning lamp


Satellites (sensors for side airbags)
The satellites are sensors mounted in the side area of the vehicle on the cross members beneath the driver's and passenger's seats. They are connected by a data line to the MRS control unit.
In this way, in the event of a side impact collision all airbags on the side of the vehicle facing the point of impact can be triggered.
The sidebags and head airbags are only triggered when both the sensor and the MRS control unit have detected acceleration.


Electric parts airbag | BMW X5 E53 X5 3.0i M54 USA

[cn90]

1+,

These sensors are usually located in the cross member inside the cabin, under driver and passenger seat areas.
They measure deceleration, so if the deceleration is > 7g, then the airbag is deployed.

I don't have photos for E53 but I posted photos of these sensors in bimmerfest E39 forum.

[NotplayN]

ok, thanks for the info. just wanted to make sure they were not out on the end of the
frame rails.