Special Vehicle Multifunction Control Unit (SVMCU (MSS)), Component Description - GF54.21-P-4010GR

MODEL 166 with CODE Z17 (Heated windscreen)

MODEL 166 with CODE Z22 (Panic alarm system)

Fig 1: Identifying Special Vehicle Multifunction Control Unit

Courtesy of MERCEDES-BENZ USA

Location

The special vehicle multifunction control unit (MSS) is located under the driver seat.

Task

The special vehicle multifunction control unit (SVMCU [MSS]) has the following tasks:

Reading in of sensors and signals

The input factors are read in via the following connections:

Direct line

With CODE Z22 (Panic alarm system (PAS)), the signals of the following components are read in via direct lines:

Vehicle interior PAS [GAS] microphone (B25/3)
Control unit (N26/8)
Left footwell emergency alarm system button (S62/16)
Right footwell emergency alarm system button (S62/17)
Rear air vent emergency alarm system button (S62/18)

Interior CAN

With CODE Z22 (Panic alarm system (PAS)), the following signals are read in via the interior CAN, among other things:

With CODE Z17 (Heated windshield), the following signals are read in via the interior CAN, among other things:

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 whereupon the relevant signals are then issued.

Output of signals

The signals are output via the following connections:

Direct line

With CODE Z22 (Panic alarm system (PAS)), the PAS control unit is actuated via a direct line.

With CODE Z17 (Heated windshield), the heated windshield relay (K13/2) is actuated via a direct line.

Interior CAN

With CODE Z22 (Panic alarm system (PAS)), the following signals are transmitted via the interior CAN, among other things:

Static low beam request (with CODE 615 (Bi-xenon headlamps with active curve lights) or CODE 621 (Intelligent Light System (left-hand traffic)) or CODE 622 (Intelligent Light System))
High beam request flashing on and off
Alarm request flashing on and off
CL closing request
Request for switching on "recirculated air"

The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).

Wiring diagram, special vehicle multifunction control unit (SVMCU [MSS])