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Passenger-Side Seat Occupied Recognition Function - GF91.60-P-1100LF

Model 222 Except Code U10 (Automatic seat occupancy recognition and child seat recognition) 

Function requirements, general 

IMPORTANT The electronic ignition lock control unit (N73) sends the circuit 15 status over the user interface CAN (CAN HMI) to the supplemental restraint system control unit (N2/10).

Passenger-side seat occupied recognition, general 

The occupancy of the front passenger seat is recorded by the supplemental restraint system control unit. In vehicles with CODE U18 (Automatic child seat recognition ACSR [AKSE]) a fitted child seat is also recognized.

IMPORTANT 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 two transponders (resonators), which are located at the left and right in its base.

The passenger-side seat occupied recognition function includes the following subfunctions:

Function sequence for seat occupancy recognition (Except Code U18 (Automatic child seat recognition ACSR [AKSE])) 

The front passenger seat occupied recognition is recorded by the front passenger seat occupied recognition (B41/1). Only the status "seat occupied" or "seat not occupied" can be detected. The supplemental restraint system control unit reads in the relevant signals of the front passenger seat occupancy recognition.

IMPORTANT The occupancy status of the front passenger seat has no influence on the triggering behavior of the supplemental restraint system. The occupancy status is only required by the instrument cluster (A1) for the seat belt reminder warning.

Function sequence for seat occupancy recognition (With Code U18 (Automatic child seat recognition ACSR [AKSE])) 

The occupancy of the front passenger seat by a person or a child seat is recorded by the front passenger seat occupied recognition and ACSR [AKSE] (B48).

The following situations are defined:

Pedestrian detection 

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 cushion exceeds a defined value, the electronic analysis system recognizes that the front passenger seat is occupied by a person and sends a corresponding signal over the seat occupancy LIN (LIN E2) to the supplemental restraint system control unit. 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.

Child seat recognition 

When a child seat is in position, the signals that are transmitted by the electronic analysis system via the transmission antennas in the front passenger seat occupied recognition and ACSR [AKSE] are modified by the resonators in the child seat. These signals are received by the respective receiving antennas in the front passenger seat occupied recognition and ACSR [AKSE] and forwarded to the electronic analysis system. The electronic analysis system evaluates the signals and sends the current status (e.g. child seat present or not, child seat positioned incorrectly) via seat occupancy LIN to the supplemental restraint system control unit. Through evaluation of the two signals, it is also possible to determine how the child seat is oriented (in or opposite the direction of travel).

Additional function requirements for issuing status and fault messages (With Code U18 (Automatic child seat recognition ACSR [AKSE])) 

Function sequence for issuing status and fault messages (With Code U18 (Automatic child seat recognition ACSR [AKSE])) 

The occupancy status of the front passenger seat is shown as follows:

Both indicator lamps remain off.

The Supplemental Restraint System control unit sends each request over the user interface CAN, the electronic ignition lock control unit, interior CAN (CAN B), front SAM control unit (N10/6) and the instrument panel LIN (LIN 1) to the center instrument panel button group (S6/2), which then actuates the corresponding indicator lamp directly.

Fault messages 

In case of an error (e.g. seat occupied recognition and front passenger seat ACSR defective, child seat positioned incorrectly, connection to supplemental restraint system control unit disrupted), the following indicator lamps are switched on:

A fault code is also stored in the supplemental restraint system control unit and an appropriate message is shown on the instrument cluster. The supplemental restraint system control unit transmits the request to display a corresponding message via user interface CAN to the instrument cluster.

  Electrical function schematic for deployment o supplemental restraint system   PE91.60-P-2055-97SEA
  Overview of system components for supplemental restraint system   GF91.60-P-9996LF 
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