Section 739 (Navigation/Telecommunication (Service Information)): Microphone: Operation

WARNING: This page is about a different car, the 2020 Chrysler 300 and 2019 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

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 circuitry of the two stereo 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 status of the ignition switch (Keyless Ignition Node/KIN) transitions to OFF, whichever occurs first.

The inputs from the microphones 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. Each of these electronic modules is also integral and internal to the RRM.

The status of the Uconnect® feature Assist and the SiriusXM® Guardian connected vehicle services SOS push buttons is relayed by the Local Interface Network (LIN) slave node integral to the inside rear view mirror over the LIN data bus to the Body Control Module (BCM), which is a LIN master node. The BCM is also a Controller Area Network (CAN) data bus gateway and 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 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.