DTC B15D8: Monitor Disconnected: Description

The navigation receiver assembly and parking assist ECU are connected by the AVC-LAN communication line.

When an AVC-LAN communication error occurs between the navigation receiver assembly and parking assist ECU, this DTC will be stored.

DTC Code	DTC Detection Condition	Trouble Area
B15D8	When either of the conditions below is met: Parking assist ECU is/was not connected while the ignition switch is on (IG or ACC). Communication between the master unit and the parking assist ECU is not possible when the engine is started.	Parking assist ECU power source circuit AVC-LAN circuit between navigation receiver assembly and parking assist ECU Navigation receiver assembly Parking assist ECU Harness or connector

HINT:

Even if no fault is present, this DTC may be stored depending on the battery condition or engine start voltage.
The navigation receiver assembly is the master unit.