DTC B156C: Extension Module Disconnected: Description

The extension module and the radio and display receiver assembly are connected by the AVC-LAN communication line.

When an AVC-LAN communication error occurs between the extension module and the radio and display receiver assembly, this DTC will be stored.

DTC No.	DTC Detection Condition	Trouble Area
B156C	When either condition below is met: Extension module is/was not connected while the ignition switch is/was ON or ACC. Communication between the master unit and the extension module is not possible when the engine is/was started.	Extension module power source circuit AVC-LAN circuit between radio and display receiver assembly and extension module Extension module Radio and display receiver assembly Harness or connector

HINT:

The radio and display receiver assembly is the master unit.