Two-way radio handsfree system function - GF82.25-P-2013CE

MODEL 204.0 /2 with CODE (965) Electrical preinstallation for rental vehicles with CODE (938) Preinstallation for handsfree two-way radio as of model year 2009 /YoM 08 

Function requirements, general 

• Circuit 15C ON

The electronic ignition lock control unit (N73) sends the status of circuit 15 via interior CAN (CAN B) to the special-purpose vehicle multifunction control unit (N26/9).

Two-way radio handsfree system, general 

The two-way radio handsfree system allows the driver to communicate, e.g. with the taxi main office, via the two-way radio (A49) (accessories) or radio data transmission two-way radio (A49/5) (accessories).

Active audio sources are automatically muted during the two-way radio call.

The two-way radio is installed in the glove compartment (with code (334) Two-way radio bracket in glove compartment) and the radio data transmission two-way radio in the spare wheel well in the trunk (with code (335) Two-way radio bracket in trunk).

In addition, there is the option of attaching a remote control panel on the accessories console (with code (333) Taxi accessories console).

Function sequence for two-way radio handsfree system 

By pressing the two-way radio connection switch (S93/2), the two-way radio or radio data transmission two-way radio is switched to transmission mode and the taxi driver can establish a radio connection. While speaking, the two-way radio connection switch must remain pressed.

The voice is recorded using the taxi wireless microphone (B25/10) mounted on the inside rearview mirror (A67).

As soon as the two-way radio connection switch is released, it is possible to receive the voice output from the call recipient. This is output over the taxi two-way radio speaker (H6).

The multifunction control unit reads in the status of the two-way radio connection switch, evaluates the signal and sends it to the two-way radio or the radio data transmission two-way radio. The two-way radio or radio data transmission two-way radio forwards the signal to the multifunction antenna (A28/11) to be sent:

The voice output is now sent to the call recipient via the multifunction antenna. Incoming radio signals are received by the multifunction antenna and forwarded to the two-way radio or the radio data transmission two-way radio.

With an active two-way radio connection, a corresponding symbol is shown in the travel distance display (A1p7) (without code (442) Comfort multifunction steering wheel) or in the multifunction display (A1p13) (with code (442) Comfort multifunction steering wheel) of the instrument cluster (A1). To do so, the special-purpose vehicle multifunction control unit sends the status "Two-way radio connection active" via interior CAN to the instrument cluster.

The special-purpose vehicle multifunction control unit is used as a gateway between the interior CAN and the taxi components.

The request for muting active audio sources is sent by the multifunction control unit via interior CAN, depending on the equipment, to the following control unit:

• Radio (A2) (with code (523) Radio MB Audio 20 or code (510) Audio 20 incl. CD changer)
• Radio with autopilot system (A2/56) (with code (525) Radio MB Audio 50 APS or code (511) Audio 50 APS incl. DVD changer)
• COMAND controller unit (A40/3) (with code (527) COMAND APS with single DVD drive (with navigation) or code (512) COMAND APS with DVD changer or as of 1.6.09 with code (528) COMAND with DVD changer)

	Electrical function schematic for two-way radio handsfree system		PE82.25-P-2062-97FAA
	Component description for instrument cluster	A1	GF54.30-P-6000CE
	Component description for the radio	A2 With code (523) MB Audio 20 radio	GF82.60-P-3122CE
		With code (510) Audio 20 with CD changer	GF82.60-P-3122CEB
	Component description for radio with auto pilot system	A2/56 with code (525) Radio MB Audio 50 APS or code (511) Audio 50 APS incl. DVD changer	GF82.61-P-4112CE
	Component description for COMAND controller unit	A40/3 With code (512) COMAND APS incl. DVD changer or code (527) COMAND APS with single DVD drive (with navigation) without code (498) Japan version or as of 1.6.09 with code (528) COMAND incl. DVD changer	GF82.85-P-3136CE
	Special vehicle multifunction control unit (SVMCU [MSS]), component description	N26/9	GF54.21-P-4010CE
	Component description for the electronic ignition lock control unit	N73	GF80.57-P-6001CE