Right front seat control unit, component description - GF91.29-P-5240LE

MODEL 216.3, 221.0 /1 as of model year 2009 /YoM 08 

Shown on model 221 model year 2009 /YoM 08 

Location 

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

Task 

• Control of seat adjustment in accordance with the requests sent over the interior CAN (CAN B)
• Saving of memory settings for seat, steering column and outside mirrors (for right-hand drive vehicles, for left-hand-drive vehicles memory settings for seat only)
• Control of lumbar support adjustment (without code (409) Left/ right front multicontour seats and without code (432) Left and right dynamic multicontour seat)
• Control of seat heaters HS [SIH] (on model 221 with code (873) Right and left front seat heaters or code (401) Front comfort seats, incl. seat heating and seat ventilation and on model 216)
• Control of seat ventilation (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
• Control for easy entry/exit (only right-hand drive vehicles model 221 with code (275) Memory package for electrically adjustable front seats or right-hand drive vehicles (model 216)
• Seat belt comfort fit feature
• Control for crash-active easy exit (only right-hand drive vehicles model 221 with code (275) Memory package for electrically adjustable front seats or right-hand drive vehicles model 216)
• Control for memory function (only right-hand drive vehicles model 221 with code (275) Memory package for electrically adjustable front seats or right-hand drive vehicles model 216)
• Control of rear compartment access (EASY-ENTRY function) (model 216)
• Actuation of front passenger seat adjustment with PRE-SAFE (left-hand drive vehicles only)
• Actuation of footwell illumination in rear (on model 221)

These are grouped as follows:

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

Reading in of sensors and signals 

These input factors are read in via the following connections:

• Direct line 
• Interior CAN 

Direct line 

• Circuit 30
• Tml. 31

The following sensors are read in via direct lines:

• Hall sensors of seat adjustment motors
• Front passenger lumbar support regulator control unit (N32/24) (without code (409) Left/right front multicontour seats and without code (432) Left and right dynamic multicontour seat)
• Vehicle-sensitive belt lock sensor (A60) (on model 216)
• Right front seat backrest angle microswitch (S92/1) (on model 216)

The right front seat control unit serves as a contact point for:

• Left front multicontour backrest control unit (N32/16) (with code (409) Left/right front multicontour seat)
• Front passenger lumbar support regulator control unit (N32/24) (without code (409) Left/right front multicontour seats and without code (432) Left and right dynamic multicontour seat)
• Left front dynamic seat control unit (N32/22) (with code (432) Left/right front multicontour seat)
• Right front seat ventilation blower regulator (N29/6) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)

Interior CAN 

• Right front seat operation switch group (S23) by the right front door control unit (N69/2) (model 221) or right door control unit (N69/2) (model 216)
• Steering column status by the front SAM control unit with fuse and relay module (N10/1) (right-hand drive vehicles)
• Lumbar support specified position and PRE-SAFE request by the central gateway control unit (N93)
• Brightness as well as switch-on and switch-off signals for the footwell illumination in the rear by the overhead control panel control unit (N70)
• Terminal status from EIS [EZS] control unit (N73)

Evaluation of input factors 

The input factors that have been read in are evaluated by the right front seat control unit, the actuators are then actuated. The actuation of the motors for the seat adjustment takes place via integrated relays.

Actuation of components 

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

• Direct line 
• Interior CAN 

Direct line 

The following components are actuated via direct lines:

• Right rear footwell lamp (E17/17) (on model 221)
• Right front seat fore/aft adjustment motor (M28/1)
• Right front head restraint motor (M28/4)
• Right front backrest angle adjustment motor (M28/5)
• Right front seat cushion fore/aft motor (M27/8)
• Right front seat cushion inclination motor (M28/9)
• Right front seat height adjustment motor (M28/10)
• Right front seat belt comfort solenoid (K18/5)
• Left front seat belt lock relay (K18/3) (model 216)
• Right front seat heater pad (R13/3) and right front backrest heater pad (R13/4) (on model 221 with code (873) Left and right front seat heater or code (401) Front comfort seats including seat heating and seat ventilation and on model 216)
• Right front seat ventilation blower regulator (with code (401) Front comfort seats incl. seat heating and seat ventilation)
• Front passenger lumbar support regulator control unit (without code (409) Left/right front multicontour seats and without code (432) Left and right dynamic multicontour seat)
• Power supply for right front multicontour backrest (with code (409) Left/right front multicontour seat) or right front dynamic seat control unit (with code (432) Left/right front multicontour seat)

Interior CAN 

• Signals for actuating the memory positions of the outside mirrors at the left front door control unit (N69/1) (model 221) or left door control unit (N69/1) (model 216) or at the right front door control unit (model 221) or right door control unit (model 216) (right-hand drive vehicles only)
• Signals for actuating memory positions of steering column to front SAM control unit with fuse and relay module (only right-hand drive vehicle)
• Signals for adjusting stored pressures to corresponding memory positions for dynamic multicontour seat to right front dynamic seat control unit (with code (432) Left/right front multicontour seat)
• Signals for adjusting stored pressures to corresponding memory positions to right front multicontour backrest control unit (with code (409) Left/right front multicontour seat)
• Signal for output of acknowledgment tone after storing memory position to instrument cluster (A1) via central gateway control unit (right-hand drive vehicles on model 221 with code (275) Memory package for electrically adjustable front seats or right-hand drive vehicles model 216)

Variants 

The following variants are available for the hardware of the right front seat control unit.

• Right front seat control unit, model 216
• Right front seat control unit, model 221

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

	Wiring diagram of right front seat control unit	MODEL 221 control unit N32/2	PE91.29-P-2102-99SAA
		MODEL 216 control unit N32/2	PE91.29-P-2102-99CAA