Active Belt Buckle Control Unit, Component Description - GF91.60-P-4122LF

Model 222 With Code 305 (Rear PRE-SAFE) 

Location 

The active belt buckle control unit is located on the left equipment support in the trunk.

Tasks 

The active belt buckle has the following tasks:

• Reading in of signals 
• Evaluation of input factors 
• Actuation of components 

Reading in of signals 

The input factors are read in via the following connections:

• Direct line 
• Interior CAN (CAN B) 

Direct line 

The signals from the following components are read via direct lines:

• Left rear seat active belt buckle motor (M64/1)
• Right rear seat active belt buckle motor (M64/2)

Interior CAN 

The following signals, among others, are read in via interior CAN:

• Status of the left rear belt buckle switch (S68/11)
• Status of the right rear belt buckle switch (S68/12)
• Status of the center rear belt buckle switch (S68/14) (without code (224) Individual rear seat system design)
• PRE-SAFE status
• PRE-SAFE stage
• Crash signal
• Status of seat belt adjustment function
• Status of rear doors (open/closed)
• Status of central locking
• Status of engine operation

Evaluation of input factors 

The read-in input factors are evaluated by the integrated microprocessor whereupon the integrated components are actuated and the CAN signals issued.

Actuation of components 

The components are actuated via the following connections:

• Direct line 
• Interior CAN 

Direct line 

The following components are actuated via direct lines:

• Left rear seat active belt buckle motor
• Right rear seat active belt buckle motor

Interior CAN 

The following signal is also sent over the interior CAN:

• Request to display fault message to instrument cluster (A1)

Wiring diagram for active belt buckle control unit

PE91.60-P-2107-97SEA