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Pinpoint Test G: The Defrost System Will Not Shut Off Automatically

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK CIRCUIT CRD06 (BN/YE) FOR A SHORT TO VOLTAGE 
    • Disconnect: Rear Window Defrost Relay
    • Key in ON position.
    • Is the rear window defrost ON? 
    1. YES  : REPAIR circuit CRD06 (BN/YE) for a short to voltage. TEST the system for normal operation.
    2. NO  : Go to  G2.
  2. G2 CHECK THE REAR WINDOW DEFROST RELAY 
    • Start the engine.
    • Measure the resistance between rear window defrost relay socket pin 86, circuit CH122 (WH/OG), harness side and ground.
      • Fig 1: Measuring Resistance
      GF0045457Courtesy of FORD MOTOR CO.
    • Is the resistance less than 60 ohms? 
    1. YES  : Go to  G3.
    2. NO  : INSTALL a new rear window defrost relay. TEST the system for normal operation.
  3. G3 CHECK THE HVAC MODULE 
    • Key in OFF position.
    • Disconnect: HVAC Module - Electronic Automatic Temperature Control (EATC) C228b or HVAC Module - Electronic Manual Temperature Control (EMTC) C294a
    • Start the engine.
    • Measure the voltage between rear window defrost relay socket pin 85 and pin 86, circuit CH122 (WH/OG), harness side.
      • Fig 2: Measuring Voltage
      GF0045459Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR short to ground in circuit CH122 (WH/OG). TEST the system for normal operation.
    2. NO  : Go to  G4.
  4. G4 CHECK FOR CORRECT HVAC MODULE OPERATION 
    • Disconnect all HVAC module connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all HVAC module connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new HVAC module. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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