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Pinpoint Test G: The Defrost System Does Not Shut Off Automatically - On At All Times

WARNING: This page is about a different car, the 2005 Mercury Mountaineer, 2005 Ford Explorer, 2004 Mercury Mountaineer, and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK CIRCUIT 186 (BN/LB) FOR A SHORT TO VOLTAGE 
    • Disconnect: Heated Backlight Relay.
    • Key in ON position.
    • Is the rear window defrost ON? 
    • Yes  : REPAIR the circuit. TEST the system for normal operation.
    • No  : GO to G2.
  2. G2 CHECK THE REAR WINDOW DEFROST RELAY 
    • Key in OFF position.
    • Disconnect: Rear Window Defrost Relay.
    • Carry out the rear window defrost relay component test. Refer to COMPONENT TESTING article.
    • Is the rear window defrost relay OK? 
    • Yes  : GO to G3.
    • No  : INSTALL a new rear window defrost relay. TEST the system for normal operation.
  3. G3 CHECK THE REAR WINDOW DEFROST RELAY 
    • Key in OFF position.
    • Measure the resistance between rear window defrost relay socket pin 86, circuit 1009 (OG/YE) harness side and ground.
      Fig 1: Checking The Rear Window Defrost Relay
      G03911595Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to  G5.
    • No  : GO to G4.
  4. G4 CHECK CIRCUIT 1009 (OG/YE) FOR A SHORT TO GROUND 
    • Disconnect: ICM C220a.
    • Measure the resistance between rear window defrost relay socket pin 86, circuit 1009 (OG/YE) harness side and ground.
      Fig 2: Check Circuit 1009 (OG/YE) For A Short To Ground
      G03911595Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : INSTALL a new ICM. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. G5 CHECK CIRCUIT 688 (GY/LB) FOR A SHORT TO GROUND 
    • Disconnect: Function Selector Switch C294b (manual A/C only) or EATC Module C228a.
    • If equipped with manual A/C, measure the resistance between function selector switch C294b-12, circuit 688 (GY/LB) harness side and ground.
      Fig 3: Check Circuit 688 (GY/LB) For A Short To Ground (1 Of 2)
      G03946041Courtesy of FORD MOTOR CO.
    • If equipped with EATC, measure the resistance between EATC module C228a-12, circuit 688 (GY/LB) harness side and ground.
      Fig 4: Check Circuit 688 (GY/LB) For A Short To Ground (2 Of 2)
      G03946041Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : If equipped with manual A/C, INSTALL a new climate control module. If equipped with EATC, INSTALL a new EATC module. REFER to AIR DISTRIBUTION AND FILTERING .
    • No  : REPAIR the circuit. TEST the system for normal operation.
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