DTC B156B: Multi-media Interface ECU Disconnected; DTC B156E: No Response from Multi-media Interface ECU: Description

The navigation receiver assembly and multi-media interface ECU are connected by the AVC-LAN communication line.

When an AVC-LAN communication error occurs between the navigation receiver assembly and multi-media interface ECU, these DTCs will be stored.

DTC Code	DTC Detection Condition	Trouble Area
B156B*	When either condition below is met: Stereo component amplifier is/was not connected while the ignition switch is ON or ACC. Communication between the master unit and the stereo component amplifier is not possible when the engine is started.	Multi-media interface ECU power source circuit AVC-LAN circuit between navigation receiver assembly and multi-media interface ECU Multi-media interface ECU Navigation receiver assembly
B156E	Within the time-out period, there was no response from the stereo component amplifier to the following requests from the master unit: System inspection request System inspection result request Diagnostic memory request

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.