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

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. K1 CHECK CIRCUIT CRD06 (BN/YE) FOR SHORT TO VOLTAGE 
    • Disconnect: Heated Rear Window Relay
    • Key in ON position.
      • Fig 1: Measuring Voltage Between Heated Rear Window Relay Pin 87, Circuit CRD06 (BN/YE) & Ground
      GF0030944Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window relay pin 87, circuit CRD06 (BN/YE), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  K2.
  2. K2 CHECK CIRCUIT CH122 (WH/OG) FOR A SHORT TO GROUND 
      Fig 2: Measuring Voltage Between Heated Rear Window Relay Pin 85, Circuit CBP45 (YE)
      GF0030942Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window relay pin 85, circuit CBP45 (YE), harness side and heated rear window relay pin 86, circuit CH122 (WH/OG), harness side.
    • Is any voltage present? 
    1. YES  : Go to  K3.
    2. NO  : Go to  K4.
  3. K3 CHECK THE HVAC MODULE 
    • Key in OFF position.
    • Disconnect: EATC C228B or EMTC C2357A
    • Key in ON position.
      • Fig 3: Measuring Voltage Between Heated Rear Window Relay Pin 85, Circuit CBP45 (YE)
      GF0030942Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window relay pin 85, circuit CBP45 (YE), harness side and heated rear window relay pin 86, circuit CH122 (WH/OG), harness side.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
  4. K4 CHECK THE HEATED REAR WINDOW RELAY 
    • Carry out the Heated Rear Window Relay Component Test. Refer to Refer to COMPONENT TESTING.
    • Did the heated rear window relay pass the component test? 
    1. YES  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
    2. NO  : INSTALL a new heated rear window relay. TEST the system for normal operation.
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