July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
DTC Detection Logic
WARNING: This page is about a different car, the 2013 Infiniti M56 and 2013 Infiniti M37. However, it is still accessible from the selected car via links, so may be relevant.
DTC
Display Item
Malfunction detected condition
Possible cause
C1909
CONTROL UNIT [ABNORMAL6]
An error is detected inside 4WAS main control unit.