Navigation/Telecommunication (Service Information): Microphone: Operation

When the hands-free Voice Recognition (VR) control circuitry integral and internal to the Radio Receiver Module (RRM) detects the appropriate inputs or requests, it energizes the two stereo's circuitry microphones mounted in the headliner just above the driver and front passenger. The microphones remain active until they are deactivated by the hands-free VR control circuitry or until the ignition switch (Keyless Ignition Node/KIN) transitions to OFF, whichever occurs first.

The microphones' inputs are processed, filtered, and redirected by the VR control circuitry and logic as appropriate. Those inputs can be directed to the Advanced Speech Recognition (ASR) engine or the Bluetooth® transceiver's audio send circuitry. Each of these electronic modules is also integral and internal to the RRM.

The status of the Uconnect® feature Assist  and SiriusXM® Guardian connected vehicle services SOS  push buttons are relayed by the Local Interface Network (LIN). A secondary Electronic Control Unit (ECU) integral to the inside rear view mirror relays the push-button status over the LIN data bus to the Body Control Module (BCM), a LIN master ECU. The BCM is also a Controller Area Network (CAN) data bus gateway that relays the push-button status information to the RRM over the CAN - Interior High Speed (CAN-IHS) data bus.

The hardwired inputs and outputs of the microphones in the inside rearview 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 diagnosing 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.