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DTC 01-DF Master Error: Description

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

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
01-DF *1	A device that uses the display fails and the master unit is switched to the audio device. A communication error between sub-master (radio receiver) and master unit occurs.	Multi-display power source circuit AVC-LAN circuit between the multi-display and the component which has stored this code AVC-LAN circuit between the multi-display and the radio receiver Multi-display Component which has stored this code
HINT: *1: When 210 seconds have elapsed after disconnecting the power supply connector of the master component with the ignition switch on (ACC or IG), this code is stored. The "Bluetooth" handsfree module is built into the radio receiver. If there is a problem, replace the radio receiver.

NOTE:

Before starling 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 multi-display is the master unit.
Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.