• The keyless entry system has an on-board diagnostic function to facilitate system diagnosis.

• The on-board diagnostic function consists of the following functions: a malfunction detection function, which detects overall malfunctions in the keyless entry system-related parts; a memory function, which stores detected DTCs; a display function, which indicates system malfunctions by DTC display; and a PID/data monitoring function, which reads out specific input/output signals.

• Using the mazda modular diagnostic system (M-MDS), DTCs can be read out and cleared, and the PID/data monitoring function can be activated.