DTC 4-7: EMERGENCY, VOL+ or VOL- Button has Connection Error: Description
WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
This DTC is output when one of the following occurs 1) the mayday ECU is malfunctioning; 2) the mayday switch on the map light assembly is malfunctioning; or 3) the wire harness between the mayday ECU and the map light is open.
DTC DETECTION CONDITION CHART
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| 4-7 | Communication or communication line is abnormal between mayday ECU and map light (mayday switch) |
|