Upper control panel control unit, component description - GF54.21-P-6040GM

MODEL 164.1 as of model year 2009/YoM 08 model refinement package

MODEL 164.8, 251.0/1 as of model year 2009/YoM 08

Shown on model 164.8 up to 30.6.11

Fig 1: Identifying Upper Control Panel Control Unit Component - Shown On Model 164.8

Courtesy of MERCEDES-BENZ USA

Location

The upper control panel control unit is located in the center of the instrument panel.

Model 164 (except 164.195) up to 30.6.11, shown without code (430) Off-road package

Fig 2: Upper Control Panel Control Unit Component Location

Courtesy of MERCEDES-BENZ USA

Model 164 (except 164.195) as of 1.7.11, shown on model 164.8 with code (430) Off-road package

Fig 3: Upper Control Panel Control Unit Component Location

Courtesy of MERCEDES-BENZ USA

Design (model 164 (except 164.195))

The upper control panel control unit contains the following operating and display components:

Automatic child seat recognition airbag OFF indicator lamp (N72/1e1)
ATA [EDW] function indicator (N72/1e2) (with code (551) Antitheft alarm system (ATA [EDW]))
ESP OFF switch (N72/1s1)
Level control switch (N72/1s2) (with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system (ADS))
Hazard warning system switch (N72/1s5) PTS OFF switch (N72/1s8) (with code (220) PARKTRONIC)
Left front HS [SIH] switch (N72/1s10) (with code (873) Left and right front seat heaters or code (401) Front comfort seats, incl. seat heating and seat ventilation)
Right front HS [SIH] switch (N72/1s11 (with code (873) Left and right front seat heaters or code (401) Front comfort seats, incl. seat heating and seat ventilation)
Left front seat ventilation switch (N72/1s13) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
Right front seat ventilation switch (N72/1s14) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
Downhill Speed Regulation switch (N72/1s24) (without code (430) Off-road package)
Off-road program switch (N72/1s25) (without code (430) Off-road package)
STH switch (N72/1s30) (with code (228) Stationary heater)
Comfort/Sport switch (ADS) (N72/1s31) (with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system (ADS))

Model 164.195, shown up to 30.6.11

Fig 4: Upper Control Panel Control Body Unit Component Location

Courtesy of MERCEDES-BENZ USA

Body (model 164.195)

The upper control panel control unit contains the following operating and display components:

Automatic child seat recognition airbag OFF indicator lamp (N72/1e1)
ATA [EDW] function indicator (N72/1e2) (with code (551) Antitheft alarm system (ATA [EDW]))
ESP OFF switch (N72/1s1)
Level control switch (N72/1s2) (with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system (ADS))
Hazard warning system switch (N72/1s5)
PTS OFF switch (N72/1s8) (with code (220) PARKTRONIC)
Left front HS [SIH] switch (N72/1s10) (with code (873) Left and right front seat heaters or code (401) Front comfort seats, incl. seat heating and seat ventilation)
Right front HS [SIH] switch (N72/1s11) (with code (873) Left and right front seat heaters or code (401) Front comfort seats, incl. seat heating and seat ventilation)
Left front seat ventilation switch (N72/1s13) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
Right front seat ventilation switch (N72/1s14) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
Comfort/Sport switch (ADS) (N72/1s31) (with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system (ADS))
Transmission mode switch (N72/1s32) (with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system (ADS))
Refueling safety detection switch (N72/1s46)

Model 251 up to 30.6.11

Fig 5: Identifying Upper Control Panel Control Body Unit Component

Courtesy of MERCEDES-BENZ USA

Model 251 as of 1.7.11

Fig 6: Identifying Upper Control Panel Control Body Unit Component

Courtesy of MERCEDES-BENZ USA

Structure (model 251)

The upper control panel control unit contains the following operating and display components:

Automatic child seat recognition airbag OFF indicator lamp (N72/1e1)
ATA [EDW] function indicator (N72/1e2) (with code (551) Antitheft alarm system (ATA [EDW]))
ESP OFF switch (N72/1s1)
Level control switch (N72/1s2) (with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system (ADS))
Hazard warning system switch (N72/1s5)
PTS OFF switch (N72/1s8) (with code (220) PARKTRONIC)
Left front HS [SIH] switch (N72/1s10) (with code (873) Left and right front seat heaters or code (401) Front comfort seats, incl. seat heating and seat ventilation)
Right front HS [SIH] switch (N72/1s11) (with code (873) Left and right front seat heaters or code (401) Front comfort seats, incl. seat heating and seat ventilation)
Left front seat ventilation switch (N72/1s13) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
Right front seat ventilation switch (N72/1s14) (with code (401) Front comfort seats, incl. seat heating and seat ventilation)
STH switch (N72/1s30) (with code (228) Stationary heater)
Comfort/Sport switch (ADS) (N72/1s31) (with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system (ADS))
Transmission mode switch (N72/1s32) (with code (489) AIRmatic (air suspension with level adjustment and adaptive damping system (ADS))

Task

The upper control panel control unit has the following tasks:

Reading in of switches and signals
Evaluation of input factors
Actuation of components

Reading in of switches and signals

The input factors are read in via the following connections:

Direct line
Instrument panel LIN (LIN 1)
Interior CAN (CAN B)

Direct line

The signals of the switches located on the upper control panel control unit are then read in directly by it.

Instrument panel LIN

The signals from the following component are read-in over the instrument panel LIN:

Rotary light switch (S1)
Lower control panel control unit (N72) (for model 164 with code (430) Off-road package)

Interior CAN

The signals are read in by the upper control panel 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.

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

Components are actuated via the following lines:

Direct line
Instrument panel LIN
Interior CAN

Direct line

The following components are actuated via direct lines:

Automatic child seat recognition airbag OFF indicator lamp
ATA [EDW] function indicator
Switch and controls illumination and function indicators of integrated switches

Instrument panel LIN

The following components are actuated via the instrument panel LIN:

Rotary light switch (switch and controls illumination)
Lower control panel control unit (switch and controls illumination) (on model 164 with code (430) Off-road package)

Interior CAN

The signals are sent by the upper control panel 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).

	Wiring diagram for upper control panel and lower control panel control unit	Model 164	PE54.21-P-2118-97MAA
	Wiring diagram for upper control panel control unit	Model 251	PE54.21-P-2119-97RAA