DTC C1581: Assist Map Number Un-Writing [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

This DTC will be stored if the power steering ECU assembly determines that the assist map is not written in the ECU.

DTC No.	DTC Detection Condition	Trouble Area
C1581	Assist map not written in power steering ECU assembly	CAN communication system Power management control ECU Main body ECU (Multiplex network body ECU) Skid control ECU (Brake booster with master cylinder assembly) Power steering ECU assembly