Special vehicle multifunction control module, task - GF82.25-P-4102-02TT

The special vehicle multifunction control module (SVMCM [MSS]) (N26/9)  is used to monitor and control special functions for special vehicles.

In addition to its internal functions the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9)  also serves as an interface between the CAN interior and the control units which do not have a separate CAN connection.

The control unit can distinguish between two basic status conditions

• Taxi
• Special-purpose vehicles:
  • government vehicles
  • Police and emergency vehicles
  • On request by the customer, private vehicles are also available with a panic alarm

Depending upon the control unit coding and equipment the special vehicle multifunction control unit (SVMCU [MSS[) (N26/9)  assumes the following tasks:

• voltage supply to service radio (A49)
• electrical voltage supply to taximeter control unit (A67n1) or to conventional taximeter (A50)
• maintain data communications with the taximeter control unit (A67n1) via the RS485 bus or with the conventional taximeter (A50) via four wires.
• electrical voltage supply to the interior socket (X58/1)
• voltage supply of connector for glove compartment (X29/1)
• control of the taxi emergency alarm system
• control of the roof sign lamp (E14/4)
• actuation of ashtray illumination at left (E9/8) and right rear (E9/9)
• control of subfunctions of the special signal system
• control of the panic-mode alarm function (private vehicles)
• control and regulation of heated windshield (Special-duty vehicles)

Networking 

For data interchange the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9)  is connected to the CAN interior.

The control unit coding is done using the Star Diagnosis via the electronic ignition switch control unit (N73). 

Exception: The heated windshield function is directly coded in the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9). 

Taxis 

There are two types of alarm available in the taxi emergency alarm system (Code 934):

• Silent Alarm (Stage 1)
• Active Alarm (Stage 2)

The individual types of alarm are actuated by pressing the emergency alarm system activate button (S62/6) or the taxi emergency alarm two-way radio remote activation transmitter (A8/4). Pressing the emergency alarm system cancel button (S62/5) switches off the taxi emergency alarm system.