Seats, Restraint Systems -- Basic Knowledge -- 215 & 220 Chassis: Adjustments Mercedes-Benz Pullman W221

Rear head restraint adjustment, function - GF91.16-P-0002S

MODEL 215, 220

Block diagram

Rear head restraint adjustment

Rear Head Restraint Adjustment - Block Diagram. Scheme 17

Function prerequisites

1. C.15 ON
2. Voltage not too low or too high

Function

The rear head restraint adjustment is accomplished pneumatically by electrically controlled pressure valves. The pneumatic system equipment control module (combined, A37) supplies the vacuum and pressure and controls the pressure valves.

The following positions are possible

1. Sequential fold down of all three (two in model 215) rear head restraints with the rear head restraint switch (N72/1s4) in the upper control panel control module (N72/1)
2. Putting up the left and right rear head restraints with the rear head restraint switch (N72/1s4) in the upper control panel control module (N72/1) (special equipment)
3. Raising and lowering the left/right rear head restraint Model 215: Control with rear head restraint raise/lower switch (S52/5) (special equipment)., Model 220: Control with head restraint adjustment raise/lower switch (N69/3s8)/(N69/4s8) in rear left door control module (N69/3)/rear right door control module (N69/4) (special equipment)
4. Putting up the left and right rear head restraints upon recognition that the belt is buckled via the left and right rear seat belt buckle and seat belt wear convenience switches (S68/11)/(S68/12) (special equipment).

Rear head restraint adjustment switch, location/purpose/design/function - GF91.16-P-4102A

MODEL 215

The rear head restraint raise/lower switch (S52/5) is located between the left rear power window switch (S21/15s1) and the right rear power window switch (S21/15s2) in the rear center console.

Identifying Rear Head Restraint Raise/Lower Switch And Left Rear Power Window Switch. Scheme 18

Rear head restraint adjustment switch, location/purpose/design/function - GF91.16-P-4102S

MODEL 215

MODEL 220 with CODE (223b) Electrically adjustable rear bench seat

MODEL 220 with CODE (224c) Electrically adjustable rear bucket seats, with seat ventilation, seat heater and memory package

Adjust front multicontour seats, function - GF91.25-P-2002S

MODEL 215, 220 with CODE (404b) Multicontour backrest driver seat

MODELS 215, 220 with CODE (405b) Multicontour backrest passenger seat

Block diagram for multicontour backrest of front seats

Identifying Dynamic Seat Switches Location. Scheme 19

Function requirements

1. Circuit 15c or circuit 15R ON
2. respective door open for t >20 s
3. Multicontour backrest control module activated

The left front multicontour backrest control module (N32/15)/ right front multicontour backrest control module (N32/16) is activated when it receives an enable signal via a discrete line from the left front seat adjustment control module with memory (N32/1)/right front seat adjustment control module with memory (N32/2)

Manual adjusting of the air cushion groups in the multicontour backrest

The switch conditions of the multicontour backrest switch group in the left front seat (S109)/and right front seat (S108) are read in by the left front multicontour backrest control module (N32/15)/right front backrest control module (N32/16). As a result of this the control module fills and empties the corresponding air cushion groups for as long as the switch is pressed and the function prerequisites are met.

At the same time data are exchanged between the relevant control module and the left front seat adjustment control module with memory (N32/1)/right front seat adjustment control module with memory (N32/2) via a discrete line so that storage and subsequent calling up of air cushion adjustments performed manually is possible via the memory feature.

Automatic adjustment of the air cushion groups in the multicontour backrest via the memory feature

The storage and calling up of adjustments performed manually is triggered and controlled by the left front door control module (N69/1)/ right front door control module (N69/2). To do this, the door control module exchanges information with the relevant seat control module via CAN messages.

If this receives the request to store, the pressure values of the air cushions conveyed from the multicontour backrest control module are stored in its non-volatile memory. If there is a later request from the door control module to call up memory items, the stored air cushion pressure values are provided to the multicontour backrest control module again. Thereupon this control module fills/empties the air cushions as per the stored values.

Change with code 344 and 343

As of 1.9.02 the left front dynamic seat control module (N32/19) and right front dynamic seat control module (N32/22) are responsible for the memory feature.

Electric seat adjustment (ESA) function - GF91.29-P-0004S

MODELS 215, 220 with CODE (275a) Memory package (driver's seat, steering column, mirrors)

Electric seat adjustment

The driver's and front passenger's seat are electrically adjustable. The adjustment takes place manually via the adjustment switches in the respective door control module. The ergo-function up to 31.5.01 facilitates the adjustment. The individual seat positions can be stored and called up via the memory feature.

As of 1.6.01 the ergonomics function is not used anymore for the front seat adjustment.

If the electrically adjustable rear bench seat is fitted (special equipment, model 220 only) the longitudinal position of the left and right halves of the seat bench can be adjusted manually using the adjusting switch in the respective door control module.

If electrically adjustable individual rear seats with memory are fitted (special equipment, model 220 only) likewise the longitudinal position and the backrest angle of the seat can be adjusted manually using the adjusting switches in the door control module. In addition it is possible to call up seat positions stored previously using the memory function

Model 220 only

With electrically adjustable rear bench seat only

Electrically adjustable individual rear seats with memory: In addition it is possible to adjust the longitudinal position and the backrest angle of the front seat (front passenger's seat) via the door control module in the rear on the front passenger's side.

Entry/exit aid as of 1.9.02 with code 275a

With the entry/exit aid the seat control module actuates the following control module when the key is removed

1. SAM/F (steering column)
2. Overhead control panel (inside rearview mirror)
3. Door control module (outside mirror)

The entry/exit aid enables the driver to get into and out of the vehicle more easily Before the driver gets out the steering column is moved upwards and the seat is moved back.

After getting in the position of the seat last adjusted is approached again or the last memory position is approached.

The driving position is stored key-dependent as is the memory position. Because of this if a key is changed a new driving position of seat, steering column and mirrors assigned to the key is adjusted.

The entry/exit aid can be configured via the instrument cluster. The function can be switched off completely or partially (only the steering column is still active).

On the V 220 with individual rear seat system with code 275a the adjustment of a permanently defined position of the front passenger's and rear seat (park position) is possible from the rear door control module.

Seat adjustment collision avoidance, function - GF91.29-P-2010A

Models 215, 220

Function prerequisites

1. Normalizing performed

To avoid collisions of the seat with the seat adjustment switch, the center console, the B-pillar or the roof, the left front seat adjustment control module with memory (N32/1) and right front seat adjustment control module with memory (N32/2) have map controls. In this connection when the motors are actuated the maximum range of adjustment is restricted by means of performance maps stored in the control module and therefore avoid the seat colliding with an obstacle.

The following possibilities of a collision can arise during seat adjustment depending on the current seat position

Front seat adjustment switch train, location/task/function - GF91.29-P-2100S

Models 215, 220

Location of front seat adjustment switch group as of 1.9.02

Identifying Front Seat Adjustment Switch Train Location. Scheme 20

Front seat adjustment switch group, location - GF91.29-P-2100-01S

Shown on model 215 up to 220/31.5.01

Identifying Front Seat Adjustment Switch Group Location - Shown On Model 215 Up To 220/31.5.01. Scheme 21

Location Shown on model 215/220 up to 31.5.01

The left front seat adjustment switch is integrated into the left front door control module (N69/1)The door control module is integrated into the door paneling.

Shown on model 215/220 up to 31.5.01

Identifying Front Seat Adjustment Switch Group Location - Shown On Model 215/220 Up To 31.5.01. Scheme 22

Location shown on models 215/220 up to 31.5.01

The right front seat adjustment switch is integrated into the right front door control module (N69/2) The door control module is integrated into the door paneling.

As of 1.6.01 not used anymore with front seat adjustment the ERGONOMY switch (N69/1s8) and the ERGONOMY switch (N69/2s8).

They are replaced by memory 3 switch (N69/1s15) and memory 3 switch (N69/2s15)

Front seat adjustment motor group, location/function - GF91.29-P-2103S

Models 215, 220

Identifying Front Seat Adjustment Motor Group Components Location - Shown On Model 215. Scheme 23

Location of front seat adjustment motor group, shown on model 215

Identifying Front Seat Adjustment Motor Group Components Location - Shown On Model 220. Scheme 24

Location of front seat adjustment motor group, shown on model 220

Left front seat adjustment control module with memory, location/task - GF91.29-P-2106S

Models 215, 220

Location

Shown on Model 220

Identifying Left Front Seat Adjustment Control Module With Memory Location - Shown On Model 220. Scheme 25

Left front seat adjustment with memory control module, location The left front seat adjustment control module with memory (N32/1) is located under the seat cushion of the left front seat. Left front seat adjustment control module, with memory, purpose GF91.29-P-2106-02S In conjunction with automatic air conditioning. GF91.29-P-2106-02I

Left front seat adjustment control module, with memory, purpose - GF91.29-P-2106-02I

Purpose

The signal for the left front seat occupation is acquired by the left front seat adjustment control module with memory and is transmitted to the automatic air conditioning control and operating module via the interior bus (CAN B)

From this information the automatic air conditioning control and operating module increases, for example, the automatic blower level of the ventilation depending on the number of people in the vehicle.

Furthermore, the blower capacity adjusted in the automatic air conditioning control and operating module is read in by the left front seat adjustment control module with memory in order to adapt the seat ventilation by actuating the fans built into the seat.

Left front seat adjustment control module, with memory, purpose - GF91.29-P-2106-02S

The left front seat adjustment control module with memory connected to the CAN bus has the following tasks (N32/1)

1. Control of the six servo DC motors for the front seat adjustment motor group with memory (M27)
2. Position recognition of these motors
3. Storage of the seat position by means of the memory feature expanded by one memory location as of 1.6.01
4. Calling up and approaching seat positions stored previously within the framework of the memory feature
5. Approaching the permanently stored seat default settings depending on the longitudinal position of the seat within the framework of the Ergo function up to 31.5.01
6. Control of heated seats/seat ventilation (special equipment)
7. Control of the seat belt wearing comfort function
8. Monitoring of backrest locking by the left front seat backrest release microswitch

(S91/3), (model 215 only)

In addition the control module is used for contacting of

Scheme 26

1. Left front seat belt buckle restraint systems switch (S68/3) with AB and GUS (only )
2. Left front buckle microswitch(S68/9)
3. Passenger seat occupied and child seat recognition sensor (B48) (right hand steering only)
4. Left front multicontour backrest control module (N32/15) (special equipment)
5. Vehicle-sensitive seat belt lock sensor (A60), (model 215 only)
6. Left front seat backrest angle microswitch group (S91/1), (model 215 only)

Right front seat adjustment control module with memory location/task - GF91.29-P-2107S

Models 215, 220

Location

Shown on Model 220

Identifying Right Front Seat Adjustment Control Module With Memory Location - Shown On Model 220. Scheme 27

Right front seat adjustment with memory control module, location The right front seat adjustment control module with memory (N32/2) is located under the seat cushion of the right front seat. Right front seat adjustment control module with memory, task GF91.29-P-2107-02S In combination with automatic air conditioning GF91.29-P-2107-02I

Right front seat adjustment control module with memory, task - GF91.29-P-2107-02I

Purpose

The seat occupation signal of the right front seat is acquired by the right front seat adjustment control module with memory and is sent to the automatic air conditioning control and operating module via the interior bus (CAN B).

From this information the automatic air conditioning control and operating module increases, for example, the automatic blower level of the ventilation depending on the number of people in the vehicle.

Furthermore, the blower capacity adjusted at the automatic air conditioning control and operating module is read in by the right front seat adjustment control module with memory in order to adapt the seat ventilation by actuating the fans built into the seat.

Right front seat adjustment control module with memory, task - GF91.29-P-2107-02S

The right front seat adjustment control module with memory (N32/2) connected to the CAN bus has the following tasks

1. Control of the six servo DC motors of the right front seat adjustment motor group with memory (M28)
2. Position recognition of these motors
3. Storage of the seat position by the memory feature as of 1.6.01 expanded by one memory location
4. Calling up and approaching seat positions stored previously within the framework of the memory feature
5. Approaching the permanently stored seat default settings depending on the longitudinal position of the seat within the framework of the Ergo function up to 31.5.01
6. Control of heated seats/seat ventilation (special equipment)
7. Control of the seat belt wearing comfort function
8. Monitoring of backrest locking by right front seat backrest release microswitch

(S92/3), (model 215 only)

In addition the control module is used for contacting of

1. right front seat belt buckle restraint systems switch (S68/4) with AB and GUS (only )
2. Right front buckle microswitch (S68/10)
3. Occupation recognition and automatic child seat recognition in front passenger's seat (B48) (left hand steering vehicle only)
4. Right front multicontour backrest control module (N32/16) (SA)
5. Vehicle-sensitive seatbelt lock sensorA60Model 215 only
6. Right front seat backrest angle microswitch group (S92/1), (model 215 only)

Seat calibration, function - GF91.29-P-3005S

Models 215, 220

Function requirements

1. Voltage not too high or too low
2. Seat adjustment switch is not pressed.

Through normalization in the left front seat adjustment control module with memory (N32/1)/right front seat adjustment control module with memory (N32/2) the counter counts of the position recognitions of the adjustment motors are linked to the actual positions.

The normalization is a prerequisite for easy entry (model 215 only) and the Ergo function up to 31.5.01.

Performing normalization

Separate normalization is required for each adjustment motor. Normalization occurs by approaching the respective mechanical stop. Actuation must be carried out in this position for a further 250 ms at least.

Once normalization has been carried out, the control module must be still supplied with voltage for at least 5 seconds in order to ensure a complete and faultless storage in the nonvolatile memory (EEPROM)

The mechanical stop relevant to the respective normalization

Model 215

Model 220

Summary, electrical seat adjustment (ESV) system component, location/task/ design/function - GF91.29-P-9998SZ

MODELS 215, 220 as of 1.9.02