DTC 01-D6: No Master; DTC 01-D7: Connection Check Error: Description

DTC No.	DTC Detection Condition	Trouble Area
01-D6*1	Either condition is met: The device that stores (stored) the DTC has (had) been disconnected with the ignition switch to ON or ACC. The master device has (had) been disconnected when this DTC is (was) stored.	Radio receiver assembly power source circuit Power source circuit of the component which has stored this code AVC-LAN circuit between the radio receiver assembly and component which has stored this code Component which has stored this code Radio receiver assembly
01-D7*2	Either condition is met: The device that stored the code has (had) been disconnected after the engine starts (started). The master device has (had) been disconnected when this DTC is (was) stored.

HINT:

*1: Even if no fault is present, this DTC may be stored depending on the battery condition or engine start voltage.
*2: When 210 seconds have elapsed after disconnecting the power supply connector of the master component with the ignition switch to ON or ACC, this DTC is stored.

NOTE:

Before starting troubleshooting, be sure to clear the DTCs stored due to the reasons described in the HINT above. Then, check for DTCs and troubleshoot according to the output DTCs.
The radio receiver assembly is the master unit.
Be sure to clear and recheck for DTCs after the inspection is completed to confirm that no DTCs are output.