Passenger-side seat occupied recognition function - GF91.60-P-1100FQ

MODEL 218 without CODE U10 (Front passenger seat with weight sensor) 

Function requirements, general 

• Circuit 15R ON

The status of circuit 15 is sent to the supplemental restraint system control unit (N2/10) by the electronic ignition lock control unit (N73) via chassis CAN (CAN E) (up to 28.02.2013) or chassis CAN 1 (CAN E1) (as of 01.03.2013).

Passenger-side seat occupied recognition, general 

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

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 front passenger seat occupied recognition 
• Function sequence for issuing status and error messages (with code (U18) Automatic child seat recognition (ACSR [AKSE])) 

Function sequence for front passenger seat occupied recognition 

Without code (U18) Automatic child seat recognition (ACSR): 

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.

The occupancy status of the front passenger seat has no influence on the triggering behavior of the Supplemental Restraint System. The occupancy status is required by the instrument cluster (A1) for the seat belt reminder warning function.

With code (U18) Automatic child seat recognition (ACSR): 

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:

• Seat not occupied
• Seat occupied (light or heavy person)
• Child seat detected

The supplemental restraint system control unit reads in the relevant signals of the front passenger seat occupancy recognition and ACSR [AKSE] directly on vehicles up to 30.11.2011. On vehicles as of 01.12.2011, the Supplemental Restraint System control unit reads in the corresponding signals of the seat occupied recognition and front passenger seat ACSR [AKSE] via the seat occupancy LIN (LIN E2).

Additional function requirements for issuing status and error messages (with code (U18) Automatic child seat recognition (ACSR [AKSE])) 

• Indicator lamp self-test completed successfully

Information about the indicator lamp self-test can be found in the subfunction "supplemental restraint system triggering function" in chapter "System monitoring".

Function sequence for issuing status and error messages (with code (U18) Automatic child seat recognition (ACSR [AKSE])) 

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

• Front passenger seat occupied (front passenger airbag activated):

  Automatic child seat recognition airbag OFF indicator lamp (N72/1e1) in upper control panel control unit (N72/1) does not light up.

• Front passenger seat not occupied (front passenger airbag inactive):

  Automatic child seat recognition airbag OFF indicator lamp does not light up.

• Child seat recognized (front passenger airbag inactive):

  Automatic child seat recognition airbag OFF indicator lamp lights up continuously.

The Supplemental Restraint System control unit sends the request to switch the automatic child seat recognition airbag OFF indicator lamp on or off via the chassis CAN (up to 28.02.2013) or chassis CAN 1 (as of 01.03.2013) to the front SAM control unit with fuse and relay module (N10/1). The front SAM control unit actuates the automatic child seat recognition airbag OFF indicator lamp correspondingly via the instrument panel LIN (LIN 1).

Fault messages: 

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

• Supplemental restraint system indicator lamp (A1e15) in the instrument cluster
• Automatic child seat recognition airbag OFF indicator lamp

A fault code is also stored in the supplemental restraint system control unit and a correspondent message is shown on the multifunction display (A1p13) of the instrument cluster.

The request to display a corresponding message is sent by the Supplemental Restraint System control unit on vehicles up to 28.02.2013 via the chassis CAN or on vehicles as of 01.03.2013 via the chassis CAN 1, front SAM control unit, and chassis CAN 2 (CAN E2) to the instrument cluster.

	Actuate supplemental restraint system, electrical function schematic	MODEL 218 up to model year 2014 without CODE U10 (Front passenger seat with weight sensor)	PE91.60-P-2055-97XAA
		MODEL 218 as of model year 2014 without CODE U10 (Front passenger seat with weight sensor)	PE91.60-P-2055-97XAB
	Overview of system components for supplemental restraint system		GF91.60-P-9996FQ