DTC 01-E2 ON / OFF Indication Parameter 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 CHART
DTC Code
DTC Detection Condition
Trouble Area
01-E2
Signal for ON / OFF control from master device has problem