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DTC Detection Logic

WARNING: This page is about a different car, the 2010 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTION LOGIC CHART

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1805 Brake switch A brake switch signal is not sent to ECM for extremely long time while the vehicle is being driven.
  • Harness or connectors (Stop lamp switch circuit is open or shorted.)
  • Stop lamp switch