Navigation/Telecommunication (Service Information): Microphone: Operation: Operation

When the hands-free Voice Recognition (VR) control circuitry integral and internal to the Radio Receiver Module (RRM) (also known as the radio or the head unit) detects the appropriate inputs or requests, it energizes the circuitry of the two stereo microphones within the inside rear view mirror housing. The microphones remain active until they are deactivated by the hands-free VR control circuitry, or until the status of the ignition switch transitions to Off, whichever occurs first.

The input from the microphone is processed, filtered and redirected by the VR control circuitry and logic as appropriate. Those inputs can be redirected to the Advanced Speech Recognition (ASR) engine or to the audio send circuitry of the Bluetooth™ transceiver within the Hands Free Module (HFM) (also known as the Bluetooth™ module).

The hard wired inputs and outputs of the microphones in the inside rear view mirror may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the microphone or the electronic controls and communication between modules and other devices that provide some features of the RRM controlled microphones. The most reliable, efficient and accurate means to diagnose the RRM or the electronic controls and communication related to RRM-controlled microphone operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.