C1A11 — OBD2 Diagnostic Trouble Code (Toyota)

The driving support ECU assembly transmits pre-collision system control operation signals based on signals from the millimetre wave radar sensor assembly. The millimetre wave radar sensor assembly performs self diagnostic to see if the sensor beam axis has deviated when the vehicle is assessed to be moving in a straight line or on a gentle curve based on inputs from the yaw rate sensor, etc. The driving support ECU assembly detects and saves DTC C1A11 if the millimetre wave radar sensor assembly beam axis has deviated.

DTC Detection Condition

When the engine switch is on (IG), misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds.