Two-Way Radio Handsfree System Function - GF82.25-P-2013FG

Model 213 up to model year 2021 with code 938 (Hands-free two-way radio) with code 965 (Taxi/rental car - electrical pre-installation) 

Two-way radio hands-free system, general 

The radio frequency hands-free system allows the driver to communicate, e.g. with the taxi center, using the two-way radio (A49) (accessories) or the radio data transceiver (A49/5) (accessories).

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

The two-way radio is located either in the glove compartment (with code 334 (Two-way radio bracket in glove compartment)) or in the trunk (with code 335 (Two-way radio bracket in trunk)).

It is also possible to mount an operating unit to the accessories mounting console (with code 333 (Taxi accessories mounting console)).

Function sequence for two-way radio hands-free system 

Pressing the two-way radio cut-in switch (S93/2) switches the two-way radio or the radio data transceiver to the transmit mode. The wireless connection is set up. While speaking, the two-way radio actuation switch must remain pressed. The voice is recorded by the taxi radio frequency microphone (B25/10), which is located on the headliner above the sun visor on the driver side.

As soon as the two-way radio cut-in switch is released, voice output from the conversational partner is issued through the taxi radio speaker (H6).

The special-purpose vehicle multifunction control unit (N26/9) reads in the status of the two-way radio cut-in switch directly and sends it over the multifunction CAN (CAN K) to the two-way radio or the radio data transceiver.

The two-way radio or the radio data transceiver reads in the voice output from the taxi radio microphone directly and sends this over the radio roof antenna (A28/9) to the conversational partner. Incoming radio signals are received by the radio roof antenna, processed by the two-way radio or the radio data transceiver and issued through the taxi radio speaker.

With active two-way radio cut-in, the status LED in the two-way radio cut-in switch lights up. Active audio sources are muted. To do so, the multifunction control unit sends the "Mute" signal over the interior CAN (CAN B), electronic ignition lock control unit (N73) and the user interface CAN (CAN HMI) to the head unit (A26/17). The head unit then mutes any active audio sources.

	Electrical function schematic for two-way radio hands-free system		PE82.25-P-2062-97DBA
	Overview of system components for taxi/rental vehicle		GF82.25-P-9890FG