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Circuit Description

WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTION CONDITION TABLE

DTC No.	DTC Detection Condition	Trouble Area
01-D6 *1	When either of the following conditions is met: The component which has stored the code has (had) been disconnected when the ignition switch is in the ACC or ON position. The master device has (had) been disconnected when this code is stored.	Radio and navigation assembly power source circuit Power source circuit of the component which has stored this code AVC-LAN circuit between the radio and navigation assembly and the component which has stored this code Component which has stored this code Radio and navigation assembly
01-D7 *2	When either of the following conditions is met: The component which has stored the code has (had) been disconnected after the engine starts (started). The master device has (had) been disconnected when this code is (was) stored.
HINT: 1: Even if no failure is detected, this code 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 in the ACC or ON position, 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 radio 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.