Navigation/Telecommunication (Service Information): Microphone: Operation

When the hands free phone system Voice Recognition (VR) control circuitry integral and internal to the Radio Receiver Module (RRM) detects the appropriate inputs or requests, it energizes the circuitry of the microphone behind the driver side upper A-pillar trim. The microphone remains active until it is deactivated by the hands free phone 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).

The hard wired inputs and outputs of the microphone 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 microphone. 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.