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

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK THE REAR WINDOW DEFROST GRID WITH THE RELAY REMOVED 
    • Key in OFF position.
    • Disconnect: Rear Window Defrost Relay
    • Key in ON position.
    • Check the rear window defrost grid with the relay removed.
    • Is the rear window defrost still ON? 
    1. YES  : REPAIR the short to voltage in circuit CRD06 (BN/YE). CLEAR all DTCs. TEST the system for normal operation.
    2. NO  : Go to  G2.
  2. G2 CHECK THE REAR WINDOW DEFROST RELAY 
    • Carry out the Rear Window Defrost Relay component test. Refer to appropriate COMPONENT TESTING article.
    • Did the rear window defrost relay pass the component test? 
    1. YES  : Go to  G3.
    2. NO  : INSTALL a new rear window defrost relay. CLEAR the DTCs. TEST the system for normal operation.
  3. G3 CHECK CIRCUIT CH122 (WH/OG) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: HVAC Module - EMTC C2357a or HVAC Module - EATC C2356a
    • Measure the resistance between rear window defrost relay pin 2, circuit CH122 (WH/OG), harness side and ground.
      • Fig 1: Measuring Resistance
      GF0041799Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G4.
    2. NO  : REPAIR the circuit. CLEAR all DTCs. TEST the system for normal operation.
  4. G4 CHECK FOR CORRECT HVAC MODULE OPERATION 
    • Disconnect all the HVAC module connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all the 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. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all DTCs. TEST the system for normal operation.
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