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DTC Detection Logic

WARNING: This page is about a different car, the 2011 Nissan Leaf. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTING CONDITION AND POSSIBLE CAUSES

DTC Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause
P1572 ASCD BRAKE SWITCH (ASCD brake switch) A) When the vehicle speed is above 30 km/h (19 MPH), ON signals from the stop lamp switch and the ASCD brake switch are sent to the VCM at the same time.
  • Harness or connectors (The stop lamp switch circuit is shorted.)
  • Harness or connectors (The ASCD brake switch circuit is shorted.)
  • Stop lamp switch
  • ASCD brake switch
  • Incorrect stop lamp switch installation
  • Incorrect ASCD brake switch installation
  • VCM
B) ASCD brake switch signal is not sent to VCM for extremely long time while the vehicle is being driven.