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

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

When an AVC-LAN communication error occurs between the display and navigation module display 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 engine switch is on (IG) or on (ACC). Communication between the master unit and the stereo component amplifier is not possible when the engine is started.	AVC-LAN circuit Multi-media interface ECU Display and navigation module display Harness or connector
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 display and navigation module display is the master unit.