Front passenger seat control unit, component description - GF91.29-P-5241CE

MODEL 204.0/2 with CODE (242) Electrically adjustable front passenger seat with memory as of model year 2009 /YoM 08 

MODEL 204.3 with CODE (242) Electrically adjustable front passenger seat with memory 

MODEL 204.9 with CODE (242) Electrically adjustable front passenger seat with memory 

Shown on model 204.0 

Location 

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

Task 

• Control of the seat and steering column adjustment as per the requests via the interior CAN (CAN B)
• Storing of the memory adjustments for the seat
• Control of head restraint presetting

Also in model 204.0/2 as of 1.6.09 and model 204.3/9:

• Front passenger seat lumbar support adjusting facility control unit power supply (N32/24)

The front passenger seat control unit has the following tasks:

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

Reading in of sensors and signals 

The front passenger seat control unit reads in the input factors through the following connections:

• Direct line 
• Interior CAN 

Direct line 

The following sensors are read in via direct lines:

• Hall sensors of the seat adjustment motors
• EASY-ENTRY system limit switch, front passenger seat (S159/4) (in model 204.3)

The EASY-ENTRY system limit switch consists of two contact switch, the backrest inclination contact switch and the backrest release contact switch.

Interior CAN 

The signals are read in by the front passenger seat control unit over the interior CAN. 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 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)
• Front passenger seat lumbar support setting control unit (in model 204.0/2 as of 1.6.09 and model 204.3/9)

Variants 

There are no variants for the hardware of the front passenger seat control unit.

The country or left-hand drive vehicle/right hand drive vehicle allocation is software coded.

Wiring diagram of front passenger-side seat control unit

PE91.29-P-2105-97FAA