Overhead control panel control unit purpose - GF54.21-P-4105-02Q

WARNING: This page is about a different car, the 2009 Mercedes-Benz CLK350 and 2008 Mercedes-Benz CLK350. However, it is still accessible from the selected car via links, so may be relevant.

Task

Reading in the integral switches:

ESP OFF switch (N72/1s1)
Rear head restraints switch (N72/1s4)
Hazard warning system switch (N72/1s5)
Interior central locking switch (N72/1s6)

With code (551a) Anti-theft alarm system (ATA) or with code (882b) interior monitoring (only with ATA):

TS [AS]/IMS [IRS] switch with ATA [EDW] function display (N72/1s7)
Glove compartment switch, ATA (S62/7)

With code (220a) Parktronic system (PTS):

PTS OFF switch (N72/1s8)

On model 209.3 with code (540a) electrical roller blind for rear window:

Rear roller blind switch (N72/1s9)

Model with CODE (873) heated front seats at left and right with CODE (401) front deluxe seat, incl. heated seat and seat ventilation

Left front HS [SIH]/seat ventilation switch (N72/1s28)
Right front HS [SIH]/seat ventilation switch (N72/1s29)

Actuation:

Automatic child seat recognition airbag OFF indicator lamp (N72/1e1)
Switch and controls illumination of integral switches
Function illumination of integral switches

With code (228) stationary heater:

Switch and controls illumination of stationary heater switch (N72s12)

Model with CODE (873) heated front seats at left and right with CODE (401) front deluxe seat, incl. heated seat and seat ventilation

Left front seat heated cushion (R13/1)
Left front backrest heated cushion (R13/2)
Right front heated cushion (R13/3)
Right front backrest heated cushion (R13/4)

Model with CODE (401a) Front deluxe seats incl. seat heater and seat ventilation

Left front seat ventilation blower regulator (N29/5)
Front seat ventilation blower regulator (N29/6)

Front voltage supply:

Lower control panel control module (N72/)
AAC [KLA] control and operating unit (N22) (without code (581b) comfort automatic air conditioning) or
comfort AAC control and operating unit (N22/7) (with code (581b) comfort automatic air conditioning).

These are actuated by means of semiconductor switches.

To exchange data the upper control panel control unit (N72/1) is connected to the Controller Area Network bus Class B (interior) (CAN-B).