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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-DD *1	The device that should be the master has been disconnected after the engine starts.	Radio and navigation assembly power source circuit AVC-LAN circuit between the radio and navigation assembly and the component which has stored this code Radio and navigation assembly Component which has stored this code
01-E1 *2	The AMP device records that the AMP output does not function even while the source device is operating.
HINT: 1: This code may be stored if the engine is started and the ignition switch is turned to the START position again. 2: Even if no failure is detected, this code may be stored depending on the battery condition or engine start voltage.

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.