Mic Level
This diagnostic allows you to independently test the microphone and the Talk and Back buttons. They are used to activate the voice control and HFL system. The microphone is located near the map light in the roof console. It is directional, and works best with the voice coming from the driver's seat.
- Press the Talk button on the steering wheel, 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 mic level indicator on the screen does not briefly turn green, then check the wiring from the steering wheel Talk button to the navigation unit. If there is no "Mic Level" movement when you speak, then you should check the wires running from the microphone in the roof console to the HFL control unit and the navigation unit. If the wires are OK, the microphone must be faulty; replace the roof console (see step 2 on HEADLINER REMOVAL/INSTALLATION ).
- Press the Back button on the steering wheel. This should cause the BACK indicator on the screen to momentarily turn green. If it does not briefly turn green, then check the wiring from the steering wheel Back button to the navigation unit.