Inspection Procedure 4: Even When The Steering Wheel Voice Control Switch Is Operated, The Conversation Is Not Possible: Function
WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
When the steering wheel voice control switch is operated, the switch signal is transmitted to the radio and CD player < vehicles without MMCS > or multivision display < vehicles with MMCS >. Then, via the CAN communication, the signal is transmitted from the radio and CD player < vehicles without MMCS > or multivision display < vehicles with MMCS > to the hands free module.