Component description for front passenger seat control unit - GF91.29-P-5241FQ

MODEL 218 with CODE 275 (Electrically adjustable front seats memory package) 

Shown on right seat 

Location 

The front passenger seat control unit is located under the seat cushion on the front passenger seat frame.

Task 

The front passenger seat control unit controls the following functions:

• Front passenger seat adjustment
• Storing the front passenger seat memory settings
• Storing the memory settings for the active multicontour seat (with code (432) Active multicontour seat)
• Head restraint presetting
• Collision avoidance with the bench seat in rear (on model 218.3 with code (287) Through-loading feature or model 218.9)
• Movement to front passenger seat PRE-SAFE position

The tasks are subdivided as follows:

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

Reading in of sensors and signals 

The input factors are read in via the following connections:

• Direct line 
• Interior CAN (CAN B) 

Direct line 

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

• Seat fore/aft adjustment Hall sensor, front passenger seat (M28/1b1)
• Height adjustment Hall sensor, front passenger seat (M28/2b1)
• Front passenger seat inclination adjustment motor Hall sensor (M28/3b1)
• Head restraint adjustment Hall sensor, front passenger seat (M28/4b1)
• Backrest inclination Hall sensor, front passenger seat (M28/5b1)

Interior CAN 

The following signals are read in over the interior CAN:

• Seat adjustment request
• Save/Adopt memory position request
• Front door status

The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).

Evaluation of input factors 

The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Actuation of components 

The actuation of the components takes place via the following connections:

• Direct line 
• Interior CAN 

Direct line 

The following motors are actuated via direct lines:

• Front passenger seat fore/aft adjustment motor (M28/1)
• Front passenger seat height adjustment motor (M28/2)
• Front passenger seat inclination adjustment motor (M28/3)
• Front passenger seat head restraint adjustment motor (M28/4)
• Front passenger seat backrest inclination adjustment motor (M28/5)

Interior CAN 

The following signals are transmitted via the interior CAN:

• Seat adjustment status
• Request acknowledge tone after successful saving of memory position
• Save/Adopt memory position request

The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).

Wiring diagram of front passenger-side seat control unit

PE91.29-P-2105-97XAA