Navigation/Telecommunication (Service Information) 500 - Except Electric: Microphone: Operation

When the hands free phone system Voice Recognition (VR) control circuitry integral and internal to the Convergence Telematics Module (CTM) detects the appropriate inputs or requests, it energizes the circuitry of the microphone within the courtesy lamp housing. 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 of the CTM as appropriate. Those inputs can be redirected to the Advanced Speech Recognition (ASR) engine or to the audio send circuitry of the Bluetooth® transceiver. Each of these electronic modules is also integral and internal to the CTM.

The hard wired input and output of the microphone in the courtesy lamp housing 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 CTM controlled microphone. The most reliable, efficient and accurate means to diagnose the CTM or the electronic controls and communication related to CTM-controlled microphone operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.