DTC 01-E2 ON / OFF Indication Parameter 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
DTC Code
DTC Detection Condition
Trouble Area
01-E2
The command for ON/OFF control from the master device has a problem.