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Pinpoint Test G : The Defrost System Is Inoperative

  1. Refer to HEATED WINDOW for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Glass, Frames and Mechanisms - Vehicles With: One-Touch Open Driver Window - System Operation and Component Description .

    Possible Sources 

    • Fuse
    • Wiring, terminals or connectors
    • Antenna isolator module
    • Rear window defrost grid
    • Rear window glass
    • HVAC module
    • BCM
    • BJB

    Visual Inspection and Pre-checks 

    • Verify BJB fuse 50 (30A) is OK.
    • Inspect the rear window defrost grid and electrical connectors for damage.

  2. G1 CHECK THE REAR WINDOW DEFROST GRID TERMINALS FOR DAMAGE

    • Inspect the rear window defrost grid terminals and electrical connectors for damage.

    Are the rear window defrost grid terminals OK? 

    Yes  GO to  G2
    No  REPAIR the rear window defrost grid terminal as necessary. REFER to: Lead Terminal Repair .

  3. G2 CHECK THE REAR WINDOW DEFROST GRID VOLTAGE

    • Ignition OFF.

    • Disconnect: Heated Rear Window Element.

    • Start the engine.

    • Activate the rear window defrost switch.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Heated rear window element connector
      GFD477176Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  G4
    No  GO to  G3

  4. G3 CHECK FOR VOLTAGE TO THE ANTENNA ISOLATOR MODULE

    • Ignition OFF.

    • Disconnect: Antenna Isolator Module C447.

    • Start the engine.

    • Activate the rear window defrost switch.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C447-1
      GFD477176Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  INSTALL a new antenna isolator module. REFER to: Antenna Isolator Module .
    No  GO to  G5

  5. G4 CHECK THE REAR WINDOW DEFROST GRID GROUND

    • Ignition OFF.

    • Disconnect: Heated Rear Window Element C402B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C402B-1
      GFD477174Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new rear window glass. REFER to: Fixed Glass .
    No  REPAIR the circuit.

  6. G5 CHECK THE REAR WINDOW DEFROST FUSE

    • Ignition OFF.

    • Inspect the BJB fuse 50 (30A).

    Is the fuse OK? 

    Yes  GO to  G6
    No  REFER OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION the possible causes of the circuit short.

  7. G6 CHECK THE REAR WINDOW DEFROST SWITCH PID (PARAMETER IDENTIFICATION)

    • Start the engine.

    • Access the HVAC and monitor the CC_SW_R_DEFPID

    • Monitor the rear window defrost switch PID while pressing and releasing the rear window defrost switch.

    Does the PID agree with the rear window defrost switch status? 

    Yes  GO to  G7
    No  GO to  G8

  8. G7 CHECK FOR BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition OFF.

    • Ignition ON.

    • Using a diagnostic scan tool, perform BCM self-test.

    Are any BCM Diagnostic Trouble Codes (DTCs) present? 

    Yes  REFER to: Body Control Module (BCM) .
    No  GO to  G9

  9. G8 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect all the HVAC module connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins as necessary
      • pushed-out pins - install new pins as necessary

    • Reconnect the HVAC module connectors and all previously disconnected rear window defrost system connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module .
    No  The system is operating correctly at this time. The concern may have been caused by poor connections. ADDRESS the root cause of any connector or pin issues.

  10. G9 CHECK FOR CORRECT BJB (BATTERY JUNCTION BOX) OPERATION

    • Inspect the BJB connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins as necessary
      • pushed-out-pins - install new pins as necessary

    • Reconnect the BJB connectors and all other previously disconnected defrost system connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BJB.
    No  The system is operating correctly at this time. The concern may have been caused by poor connections. ADDRESS the root cause of any connector or pin issues.
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