Microphone Circuit between Microphone and Navigation Receiver Assembly [08/2014 - ]: Description

w/o Manual (SOS) Switch: 

The radio receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

Using this circuit, the radio receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the radio receiver assembly.

w/ Manual (SOS) Switch: 

The radio receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

Using this circuit, the DCM (telematics transceiver) sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the radio receiver assembly via the DCM (telematics transceiver).