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P2535 - Ignition Switch Run/Start Position Circuit High

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P2535 - IGNITION SWITCH RUN/START POSITION CIRCUIT HIGH

Description:  PCM carries out a logic check on the ignition run and run/start circuits. If the run/start circuit stays high longer than a calibrated amount of time, or is high when the PCM is in the power sustain period, this DTC will set.
Possible Causes: 
  • Ignition run/start circuit shorted to VPWR
  • Damaged ignition switch
  • Damaged PCM
Diagnostic Aids:  Monitor the KEYST PID. The PID should indicate RUN when the key is in the ON position and RUN/START when the key is in the START position.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST FE .