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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 715 (Windows And Glass - F-150 & Mark LT) >> Diagnostic Tests >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test H: The Defrost System Will Not Shut Off Automatically >> Pinpoint Test H: The Defrost System Will Not Shut Off Automatically

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

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK IC DTCs 
    • Refer to the IC self-test DTCs retrieved during the inspection and verification.
    • Are any DTCs present? 
    1. YES  : For B1345, go to  H5.
    2. For all other DTCs, REFER to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULES article.
    3. NO  : Go to  H2.
  2. H2 CHECK CIRCUIT 186 (BN/LB) FOR A SHORT TO VOLTAGE 
    • Disconnect: Heated Rear Window Relay
    • Key in ON position.
    • Is the rear window defrost ON? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  H3.
  3. H3 CHECK THE HEATED REAR WINDOW RELAY 
    • Key in OFF position.
    • Measure the resistance between heated rear window relay socket pin 85, circuit 1009 (OG/YE) harness side and ground.
      Fig 1: Checking Heated Rear Window Relay
      GF0001987Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new heated rear window relay. TEST the system for normal operation.
    2. NO  : Go to  H4.
  4. H4 CHECK THE IC - CIRCUIT 1009 (OG/YE) 
    • Disconnect: IC C220b
    • Measure the resistance between heated rear window relay socket pin 85, circuit 1009 (OG/YE) harness side and ground.
      Fig 2: Checking IC - Circuit 1009 (OG/YE)
      GF0001987Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new IC. REFER to INSTRUMENT CLUSTER article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. H5 CHECK THE IC - CIRCUIT 1010 (DB/OG) 
    • Key in OFF position.
    • Disconnect: IC C220a
    • Measure the resistance between IC C220a-8, circuit 1010 (DB/OG) harness side and ground.
      Fig 3: Checking IC - Circuit 1010 (DB/OG)
      GF0001988Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new IC. REFER to INSTRUMENT CLUSTER article. TEST the system for normal operation.
    2. NO  : Go to  H6.
  6. H6 CHECK THE IC - CIRCUIT 1010 (DB/OG) 
    • Disconnect: HVAC Module - Electronic Automatic Temperature Control (EATC) C228a or HVAC Module - Electronic Manual Temperature Control (EMTC) C294a
    • Measure the resistance between IC C220a-8, circuit 1010 (DB/OG) harness side and ground.
      Fig 4: Checking IC - Circuit 1010 (DB/OG)
      GF0001988Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new HVAC module - EATC or HVAC module - EMTC. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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