DTC 01-DF Master Error: Description

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTION CONDITION WITH TROUBLE AREA

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 (radio receiver) and master occurs	Display and navigation assembly power source circuit AVC-LAN circuit between display and navigation assembly and component which has stored this code AVC-LAN circuit between display and navigation assembly and radio receiver Display and navigation assembly Component which has stored this code
HINT * When 210 seconds have elapsed after disconnecting the power supply connector of the master component with the power switch ON (ACC or IG), 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 display and navigation assembly is the master unit.
Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.