•  The Bluetooth system (hands-free telephone (HF/TEL) system) has an on-board diagnostic function and diagnostic assist function to facilitate audio system diagnosis.

•  The on-board diagnostic function consists of the following functions: A malfunction detection function, which detects overall malfunctions in the Bluetooth system-related parts; a memory function, which stores detected DTCs; and a display function, which indicates system malfunctions via a DTC display.

•  There are two methods for reading and clearing DTCs. They include activation of the on-board diagnostic test mode of the on-board diagnostic function, which is operated using the audio unit, and the Mazda modular diagnostic system (M-MDS). The displayed DTCs differ depending on whether the on-board diagnostic test mode or the Mazda modular diagnostic system (M-MDS) method is used. Additionally, because some DTCs are not displayed in the on-board diagnostic test mode, use the Mazda modular diagnostic system (M-MDS) before performing the procedure.

•  The diagnostic assist function enables verification of the connection condition of the Bluetooth system-related parts and their specification. The password for the Bluetooth system, which is set by the user, can also be reset.