GF91.60-P-4035G Seat Occupied Recognition With Automatic Child Seat Recognition, Component Description

GF91.60-P-4035G Seat Occupied Recognition With Automatic Child Seat Recognition, Component Description
MODEL 463.306 /336 /346 up to 31.5.12 as of model year 2011 /YoM 10
MODEL 463.202 /222 /236 /237 up to 31.5.12 as of model year 2009 /YoM 08
MODEL 463.247 /248 /249 /254 /270 /271 /303 /340 /341 up to 31.5.12 as of model year 2007





B48 Front passenger seat occupied and child seat recognition sensor

Location
The seat occupied and automatic child seat recognition sensor is integrated in the seat cushion of the front passenger seat.

Task
The seat occupied recognition system is used to determine front passenger seat occupancy for the purpose of issuing a seat belt reminder warning, for weight classification and for detecting a Daimler AG approved and coded child seat including its direction of installation.

Design
The seat occupied recognition consists of a sensor mat inserted into the seat surface of the front passenger seat with the corresponding electronic analysis system.

The following are located in the sensor mat:
^ Force sensing resistors for detecting front passenger seat occupancy
^ Two transmitting and receiving antennas for detecting a child seat

Function, seat occupied recognition
If the front passenger seat is occupied by a person, the pressure load of the seat area increases. As a result, the resistance of the force sensing resistors changes. If the pressure on the seat surface exceeds a defined value, the evaluation electronics detect that the front passenger seat is occupied by a person and transmit a signal to the restraint systems control unit (N2/7) via the data line. The seat occupied status is permanently monitored.
Once the seat is no longer occupied, the occupied signal remains pending for a brief period. This provides protection from an immediate shutoff of all safety equipment if the weight is removed from the front passenger seat for a short time.

Automatic child seat recognition function
The automatic child seat recognition function is only guaranteed to work with a child seat that has been approved and coded by Daimler AG. This child seat must be equipped with 2 transponders (resonators), which are located in its base on the left and right.
When a child seat is in position, the signals that are transmitted by the electronic analysis system via the transmitting antennas in the seat occupied recognition system are modified by the resonators in the child seat. These signals are received by the relevant receiving antennas in the seat occupied recognition system and relayed to the electronic analysis system.
The electronic analysis system evaluates the signals and notifies the restraint systems control unit of the instantaneous status with (e.g. Child seat present or not present, Child seat incorrectly positioned).
Through analysis of the two signals it is also possible to determine how the child seat is oriented (in or opposite the direction of travel).