DTC 01-DF Master Error: Description

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

DTC TROUBLE DETECTION CONDITION CHART

DTC Code	DTC Detection Condition	Trouble Area
01-DF*	When either condition below is met: Device with a display fails and master is switched to the audio device. Communication error between sub-master (stereo component amplifier) and master occurs.	Navigation receiver power source circuit AVC-LAN circuit between navigation receiver and component which has stored this code AVC-LAN circuit between navigation receiver and stereo component amplifier Navigation receiver Component which has stored this code
HINT: *: When 210 seconds have elapsed after disconnecting the power supply connector of the master component with the ignition switch ON or ACC, this code is stored.

NOTE:

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