Seat Occupied Recognition Control Unit J706 - Audi A6´05 323 Service

Passenger protection
Seat occupied recognition
control unit J706
The control unit evaluates the signals coming from
the pressure sensor and the belt force sensor. The
seat occupied recognition control unit uses the
information it receives from the seat belt force
sensor to monitor the tensile force acting on the
safety belt. The voltage signal from the pressure
sensor can be used to specify the weight of the load
on the front passenger seat.
If the load is under approx. 20 kg, and a very small
or no belt force is discernible, the control unit
recognizes "child seat" and informs the airbag
control unit. The front passenger airbag is disabled.
If the load on the seat is approx. 25 kg, for example,
and the belt force exceeds a fixed value, the control
unit recognizes that the safety belt is also pressing
the child seat against the seat cushion. The control
unit recognizes "child seat" and the airbag control
unit disables the front passenger airbag.
From a load of approx. 25 kg and and a low belt
force, the control unit assumes that the seat is
occupied by an adult and the front passenger airbag
remains active.
Seat load
less than approx. 20 kg
e. g. 25 kg
greater than approx.
25 kg
40
The data from the sensors is continuously evaluated
when the ignition is switched on. This ensures that
the control unit recognizes any seat occupancy
changes and reacts accordingly.
When the vehicle is moving, the system no longer
reacts spontaneously and only does so after a
certain delay. This ensures that the front passenger
airbag is not immediately deactivated when there is
a load change on the seat whilst driving. The
acceleration sensor in the control unit informs the
electronics that the vehicle is moving.
Belt force
very small / none
very high
low
Recognition
Child seat
Child seat
Adult