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Home >> Lincoln >> 2009 >> MKX FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 2181 (Windows And Glass - Glass, Frames And Mechanisms) >> Diagnosis And Testing >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test K: The Defrost System Will Not Shut Off Automatically >> Pinpoint Test K: The Defrost System Will Not Shut Off Automatically

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

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. K1 CHECK CIRCUIT CRD06 (BN/YE) FOR SHORT TO VOLTAGE 
    • Disconnect: Rear Window Defrost Relay.
    • Disconnect: Rear Window Defrost Grid C402A.
    • Ignition ON.
    • Measure the voltage between rear window defrost grid C402A-1, circuit CRD06 (BN/YE), harness side and ground.
      Fig 1: Measuring Voltage Between Rear Window Defrost Grid C402A-1 And Ground
      G06070954Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR circuit CRD06 (BN/YE) for a short to voltage. TEST the system for normal operation.
    • No:  GO to K2  .
  2. K2 CHECK HVAC MODULE OUTPUT 
    NOTE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning of this section. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
    • Start the engine.
    • Connect a 12-volt incandescent test light between rear window defrost relay socket pin 86, circuit CH122 (WH/OG) and rear window defrost relay socket pin 85, circuit CBP45 (YE).
      Fig 2: Connecting 12-Volt Incandescent Test Light Between Rear Window Defrost Relay Socket Pin 86 And Pin 85
      G06504601Courtesy of FORD MOTOR CO.
    • Does the test light illuminate? 
    • Yes:  GO to K3  .
    • No:  INSTALL a new rear window defrost relay. TEST the system for normal operation.
  3. K3 CHECK CIRCUIT CH122 (WH/OG) FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: HVAC Module - Electronic Automatic Temperature Control (EATC) C228B or HVAC Module - Electronic Manual Temperature Control (EMTC) C2357A.
    • Ignition ON.
    • Measure the resistance between rear window defrost relay pin 86, circuit CH122 (WH/OG) and ground.
      Fig 3: Checking Circuit CH122 For Short To Ground
      G06504605Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to K4  .
    • No:  REPAIR short to ground in circuit CH122 (WH/OG). TEST the system for normal operation.
  4. K4 CHECK FOR CORRECT HVAC MODULE OPERATION 
    • Disconnect all HVAC module electrical connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all HVAC module electrical connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new HVAC module. TEST the system for normal operation.
    • 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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