Two-way radio integration function - GF82.25-P-2014LE

MODEL 221.0/1 with CODE (965) Electrical preinstallation for rental vehicles with CODE (941) Preinstallation for radio data transmission as of model year 2009/YoM 08 

Function requirements, general 

• Circuit 15 ON

The EZS control unit (N73) sends the status of circuit 15 via interior CAN (CAN B) to the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9).

Two-way radio integration, general 

The two-way radio integration is a preinstallation for the operation of the voice radio transmission and radio data transmission that allows the driver to establish communication, e.g. with the taxi main office, via the radio data transmission two-way radio (A49/5) (accessories).

The two-way radio integration is comprised of the following partial functions:

• Function sequence for switching on the radio data transmission two-way radio 
• Function sequence for switching off the radio data transmission two-way radio 
• Function sequence for fault detection 

Additional function requirements for switching on the radio data transmission two-way radio 

• Taxi mode activated in the menu "Settings", "Taxi", "Operation: Business" in the instrument cluster (A1)

Function sequence for switching on the radio data transmission two-way radio 

The radio data transmission two-way radio is a preinstallation for the two-way radio that is located in the spare wheel well in the trunk.

Using the left multifunction steering wheel button group (S110) and right multifunction steering wheel button group (S111), a radio connection, e.g. with the dispatch, can be established via the radio data transceiver. The communication via two-way radio is cyclically sent to an output (two-way radio source) of the multifunction control unit. If the cyclical two-way radio source is interrupted, this can be activated again following t = 5 s.

The multifunction control unit sends status information via interior CAN, central gateway control unit (N93) and central CAN (CAN F) to the instrument cluster, where it is shown in the multifunction display (A1p13). Pressing the multifunction steering wheel button groups signals the multifunction control unit that a two-way radio cut-in should be activated.

The signals of the multifunction steering wheel button groups are sent via steering LIN (LIN E1) to the steering column tube module (N80).

The steering column tube module forwards the signals via chassis CAN (CAN E), central gateway control unit and interior CAN to the multifunction control unit.

Following this, the multifunction control unit activates the radio data transmission two-way radio.

Alternatively, the radio data transmission two-way radio can also be activated upon unlocking the central locking (CL [ZV]) if taxi mode was not switched off beforehand.

The rear window antenna amplifier module (A2/12) receives the radio signals of the transmitter key (A8/1) and forwards them via the rear SAM control unit with fuse and relay module (N10/2) to the EZS control unit.

The EZS control unit sends the status "CL [ZV] unlocked" via interior CAN to the multifunction control unit, which then activates the radio data transceiver.

Function sequence for switching off the radio data transmission two-way radio 

The radio data transmission two-way radio can be switched off manually or automatically.

This is performed manually via the multifunction steering wheel button groups. To do so, the "Two-way radio" menu must be selected in the instrument cluster. After switching off the radio data transceiver, the message "Charge two-way radio with +" appears in the multifunction display.

In addition, three beeps sound that are output via the warning buzzer (A1h1).

If the radio data transceiver was switched off via the right multifunction steering wheel button group, this cannot be activated by unlocking the CL [ZV] or switching on circuit 15 C. The radio data transceiver can only be activated by pressing the multifunction steering wheel button groups or by triggering an emergency alarm with radio help call.

If the CL [ZV] is locked with the transmitter key, the multifunction control unit automatically switches off the radio data transmission two-way radio after the expiration of a programmable time (standard t = 30 m).

The rear window antenna amplifier module receives the radio signals of the transmitter key and forwards them via the rear SAM control unit to the electronic ignition lock control unit.

The electronic ignition lock control unit then sends the status "CL [ZV] locked" via interior CAN to the multifunction control unit.

Function sequence for fault detection 

If the radio data transceiver does not answer 50 consecutive status queries within the permissible time, e.g. due to an internal overload, the radio data transceiver is disconnected from the power supply for approx. t = 5 s. The radio data transmission two-way radio is returned to a functioning state by means of this "power-off reset".

The multifunction control unit ends any dialogs with instrument cluster that are still open. A "power-off reset" is signaled by the warning buzzer in the instrument cluster by five beeps. After approx. t = 5 s, the radio data transmission two-way radio is supplied with voltage again and receives status queries.

	Electrical function schematic for two-way radio integration		PE82.25-P-2063-97SAA
	Component description for instrument cluster	A1 Model 221.0/1 (except model 221.095/195)	GF54.30-P-6000LE
		Model 221.095/195	GF54.30-P-6000LEH
	Component description for rear SAM control unit with fuse and relay module	N10/2	GF54.21-P-6030LE
	Special vehicle multifunction control unit (SVMCU [MSS]), component description	N26/9	GF54.21-P-4010LEA
	EZS control unit, component description	N73	GF80.57-P-6003LE
	Component description for steering column tube module	N80	GF54.21-P-6050LE
	Component description for central gateway control unit	N93	GF54.21-P-4170LE