Mic Level
This diagnosis allows you to independently test the microphone and the HFL-navigation voice control switch. The TALK button is used to activate the voice control system. The microphone is located near the map light in the roof console. The microphones can now isolate the driver's voice even when there is noise or other conversations in the vehicle. To properly check the microphone, make sure you are sitting in the driver's seat.
This diagnosis checks whether the microphone and the HFL-voice control switch are connecting to the HandsFreeLink control unit. If Mic and/or STRG SW shows HFL DTCs (B1775, B1776, B1779, and/or B1780), go to indicated HFL DTC TROUBLESHOOTING .
Press the navigation TALK button on the steering wheel, wait until you hear a beep, and in a normal voice say "testing". The TALK indicator on the screen should momentarily turn green, and the text "Now Recording..." should appear in yellow. If the talk indicator shown on the screen does not briefly turn green, check the wiring from the steering wheel navigation TALK button to the audio-navigation unit. If there is no Mic Level movement when you speak, then you should check the wires running from the microphone to the HandsFreeLink control unit and the audio-navigation unit. If the wires are OK, the microphone must be faulty; replace the microphone (see HFL-NAVIGATION MICROPHONE REMOVAL/INSTALLATION ).