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P2521 - A/C Request A 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.
P2521 - A/C REQUEST A CIRCUIT HIGH

Description:  A DTC sets if the A/CFDS is high during the self-test.
Possible Causes: 
  • A/C or defrost was on during the self-test
  • A/CFDS circuit short to voltage
  • Damaged climate control function selector switch
  • Invalid combination of A/CCS and A/CFDS inputs
Diagnostic Aids:  Verify the A/C was off during the self-test.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST KM .
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