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Pinpoint Test G: The Defrost System Is Inoperative

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK THE REM DTCS 
    • Retrieve the recorded results from the REM self-test.
    • Are any REM DTCs recorded? 
  2. G2 CHECK THE REM OUTPUT 
    • Connect the scan tool.
    • Key in ON position.
    • Trigger the REM active command R DEF RLY to ON then OFF while listening for the heated rear window relay to click.
    • Does the heated rear window relay click when activated ON and OFF? 
    • Yes  : GO to  G3.
    • No  : GO to  G6.
  3. G3 CHECK THE HEATED REAR WINDOW POWER 
    • Key in OFF position.
    • Disconnect: Heated Rear Window C402a.
    • Key in ON position.
    • Enter the following diagnostic mode on the scan tool: Trigger the REM active command R DEF RLY to ON.
    • Measure the voltage between the heated rear window C402a, circuit 15S-HB19 (GN/BU), harness side and ground.
      Fig 1: Measuring Voltage Between Heated Rear Window C402A And Ground
      G03999658Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  G4.
    • No  : GO to  G10.
  4. G4 CHECK THE HEATED REAR WINDOW GROUND 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Ground C402b.
    • Measure the resistance between the heated rear window ground C402b-1, circuit 31-HB19 (BK/BU), harness side and ground.
      Fig 2: Measuring Resistance Between Heated Rear Window Ground C402B-1 And Ground
      G03999659Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  G5.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. G5 CHECK THE HEATED REAR WINDOW GRID 
    • Carry out the grid wire component test. Refer to COMPONENT TESTS  in this article.
    • Does the heated rear window grid pass the component test?
    • Yes  : INSTALL a new DATC module. REFER to CONTROL COMPONENTS . REPEAT the self-test. If the heated rear window is still inoperative, INSTALL a new REM, REFER to MULTIFUNCTION ELECTRONIC MODULES . REPEAT the self-test. TEST the system for normal operation.
    • No  : REPAIR the heated rear window grid. REFER to LEAD TERMINAL REPAIR  in this article. TEST the system for normal operation.
  6. G6 CHECK THE VOLTAGE SUPPLY TO THE HEATED REAR WINDOW RELAY 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Relay C443.
    • Key in ON position.
    • Measure the voltage between the heated rear window relay C443-86, circuit 30-HB23A (RD/WH), harness side and ground; and between the heated rear window relay C443-30, circuit 30-HB23B (RD/WH), harness side and ground.
      Fig 3: Checking The Voltage Supply To The Heated Rear Window Relay
      G03999660Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to  G7.
    • No  : GO to  G9.
  7. G7 CHECK THE HEATED REAR WINDOW RELAY 
    • Check the heated rear window relay. Refer to COMPONENT TESTING for component testing.
    • Does the heated rear window relay pass the component test? 
    • Yes  : GO to  G8.
    • No  : INSTALL a new heated rear window relay. TEST the system for normal operation.
  8. G8 CHECK CIRCUIT 91S-HB23 (BN/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: REM C420b.
    • Measure the resistance between the REM C420b-7, circuit 91S-HB23 (BN/WH), harness side and the heated rear window relay C443-85, circuit 91S-HB23 (BN/WH), harness side.
      Fig 4: Checking Circuit 91S-HB23 (BN/WH) For An Open
      G03999661Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new DATC module. REFER to CONTROL COMPONENTS . REPEAT the self-test. If the heated rear window is still inoperative, INSTALL a new REM. REFER to MULTIFUNCTION ELECTRONIC MODULES . REPEAT the self-test. TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  9. G9 CHECK CIRCUIT 30-HB23 (RD/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: BJB Fuse 29 (30A).
    • Measure the voltage between the BJB fuse 29 (30A) input cavity and ground.
      Fig 5: Measuring Voltage Between BJB Fuse 29 (30A) Input Cavity And Ground
      G03999662Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR circuit 30-HB23 (RD/WH). TEST the system for normal operation.
    • No  : REPAIR the BJB input circuit. TEST the system for normal operation. 
  10. G10 CHECK CIRCUIT 15S-HB19 (GN/BU) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Relay C443.
    • Measure the resistance between the heated rear window C402a-1, circuit 15S-HB19 (GN/BU) harness side and the heated rear window relay C443-87, circuit 15S-DA13 (GN/YE), harness side.
      Fig 6: Measuring Resistance Between Heated Rear Window C402A-1 And Heated Rear Window Relay C443-87
      G03999663Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  G11.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  11. G11 CHECK THE HEATED REAR WINDOW RELAY 
    • Check the heated rear window relay. Refer to COMPONENT TESTING for component testing.
    • Does the heated rear window relay pass the component test? 
    • Yes  : REPAIR circuit 30-HB23 (RD/WH). TEST the system for normal operation.
    • No  : INSTALL a new heated rear window relay. TEST the system for normal operation.
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