DTC B1593: No Response from Stereo Component Amplifier; DTC B15D3: Stereo Component Amplifier Disconnected: Description

The navigation receiver assembly and stereo component amplifier are connected by the AVC-LAN communication line.

When an AVC-LAN communication error occurs between the navigation receiver assembly and stereo component amplifier, these DTCs will be stored.

DTC Code	DTC Detection Condition	Trouble Area
B1593	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	Stereo component amplifier power source circuit AVC-LAN circuit between navigation receiver assembly and stereo component amplifier assembly Navigation receiver assembly Stereo component amplifier assembly
B15D3*	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.

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.