DTC C1A03: Driving Support ECU Internal Logical Error; DTC C1A06: Stop Light Switch Input Circuit [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 indicates an internal malfunction of the driving support ECU assembly.

DTC No.	DTC Detection Condition	Trouble Area
C1A03	Cruise control input signal is abnormal	Driving support ECU assembly
C1A06	Stop light switch input signal is abnormal	Driving support ECU assembly