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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 400 (Windows And Glass) >> Diagnosis And Testing >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test F: The Defrost System Is Inoperative >> Pinpoint Test F: The Defrost System Is Inoperative

Pinpoint Test F: The Defrost System Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 CHECK THE SJB DTCs 
    • Use the recorded DTC results from the SJB for the continuous and on-demand self tests.
    • Is DTC B1345 present? 

    Yes  : GO to  F9.

    No  : GO to F2.

  2. F2 CHECK THE REAR WINDOW DEFROST RELAY 

    Yes  : GO to F3.

    No  : INSTALL a new rear window defrost relay. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

  3. F3 CHECK THE REAR WINDOW DEFROST RELAY FEED CIRCUITS FOR VOLTAGE 
    • Measure the voltage between rear window defrost relay C1099-1, circuit 185 (BK), harness side and ground; and between rear window defrost relay C1099-3, circuit 185 (BK), harness side and ground.
      Fig 1: Checking Rear Window Defrost Relay Feed Circuits For Voltage
      G04622321Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 

    Yes  : GO to  F5.

    No  : GO to F4.

  4. F4 CHECK CIRCUIT 185 (BK) FOR AN OPEN 
    • Disconnect: SJB C2280b.
    • Measure the voltage between SJB C2280b-1, circuit 185 (BK), harness side and ground.
      Fig 2: Checking Circuit 185 (BK) For An Open
      G04622322Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to  F13.

    No  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

  5. F5 CHECK CIRCUIT 186 (BN/LB) FOR VOLTAGE 
    • Connect: Rear Window Defrost Relay.
    • Disconnect: Rear Window Defrost Grid C402a.
    • Key in ON position.
    • Press the rear window defrost switch to the ON position.
    • Measure the voltage between rear window defrost grid C402a-1, circuit 186 (BK), harness side and ground.
      Fig 3: Checking Circuit 186 (BN/LB) For Voltage
      G04622323Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to F6.

    No  : INSPECT smart junction box (SJB) fuse 10 (15A). If OK, GO to  F7.

  6. F6 CHECK THE GRID GROUND CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Rear Window Defrost C402b.
    • Measure the resistance between rear window defrost grid C402b-1, circuit 57 (BK), harness side and ground.
      Fig 4: Checking Grid Ground Circuit For An Open
      G04622324Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : INSTALL a new liftgate window glass. REFER to WINDOW GLASS - LIFTGATE  in this article. TEST the system for normal operation.

    No  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

  7. F7 CHECK CIRCUIT 186 (BN/LB) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280c.
    • Measure the resistance between SJB C2280c-1, circuit 186 (BN/LB), harness side and rear window defrost grid C402a-1, circuit 186 (BK), harness side.
      Fig 5: Checking Circuit 186 (BN/LB) For An Open
      G04622325Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to F8.

    No  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

  8. F8 CHECK CIRCUIT 1010 (DB/OG) FOR AN OPEN 
    • Disconnect: SJB C2280e.
    • Disconnect: Rear Window Defrost Switch C241.
    • Measure the resistance between SJB C2280e-14, circuit 1010 (DB/OG), harness side and rear window defrost switch C241-2, circuit 1010 (DB/OG), harness side.
      Fig 6: Checking Circuit 1010 (DB/OG) For An Open
      G04622326Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to F9.

    No  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

  9. F9 CHECK CIRCUIT 1010 (DB/OG) FOR A SHORT TO GROUND 
    NOTE: A short to ground on circuit 1010 (DB/OG) sets DTC B1345. The SJB then ignores input from the rear window defrost switch and causes the rear window defrost to be inoperative.
    • Key in OFF position.
    • Disconnect: Rear Window Defrost Switch C241.
      • NOTE: Make sure the rear window defrost relay is disconnected.
      Fig 7: Checking Circuit 1010 (DB/OG) For A Short To Ground
      G04622327Courtesy of FORD MOTOR CO.
    • Measure the resistance between rear window defrost switch C241-2, circuit 1010 (DB/OG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 

    Yes  : GO to  F11.

    No  : GO to F10.

  10. F10 CHECK THE SJB FOR AN INTERNAL SHORT 
    • Disconnect: SJB C2280e.
    • Measure the resistance between rear window defrost switch C241-2, circuit 1010 (DB/OG), harness side and ground.
      Fig 8: Checking SJB For An Internal Short
      G04622328Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes  : GO to  F13.

    No  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

  11. F11 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN 
    • Measure the resistance between rear window defrost switch C241-1, circuit 570 (BK/WH), harness side and ground.
      Fig 9: Checking Circuit 570 (BK/WH) For An Open
      G04622329Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to F12.

    No  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

  12. F12 CHECK THE REAR WINDOW DEFROST SWITCH 
    • Measure the resistance between rear window defrost switch C241-1 and C241-2, component side, while pressing and releasing the switch.
      Fig 10: Checking Rear Window Defrost Switch
      G04622330Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms with the switch pressed and greater then 10,000 ohms with the switch released? 

    Yes  : GO to F13.

    No  : INSTALL a new rear window defrost switch. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

  13. F13 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

    No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

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