DTC 4-7: EMERGENCY, VOL+ or VOL- Button has Connection Error: Description

This DTC is stored when one of the following occurs: 1) the telephone ECU assembly is malfunctioning; 2) the mayday switch on the map light assembly is malfunctioning; or 3) the wire harness between the telephone ECU assembly and the map light is open.

DTC Code	DTC Detection Condition	Trouble Area
4-7	Communication or the communication line is abnormal between the telephone ECU assembly and map light (mayday switch).	Telephone ECU assembly Map light assembly (Mayday switch) Harness or connector