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Pinpoint Test H: The Defrost System Is Inoperative

  1. H1 CHECK THE OPERATION OF THE HEATED EXTERIOR MIRRORS 
    • Key in START position.
    • With the engine running, press the heated rear window control switch to the ON position.
    • Do the heated exterior mirrors operate correctly? 
      • Yes  : Go to  H2.
      • No  : Go to  H5.
  2. H2 CHECK FOR VOLTAGE AT THE HEATED REAR WINDOW 
    • Disconnect: Heated Rear Window C402a.
    • With the engine running, press the heated rear window switch to the ON position.
    • 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, Circuit 15S-HB19 (GN/BU), Harness Side And Ground
      G03952854Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : For 4-door or wagon, Go to  H4.

      For 3-door, INSTALL a new heated rear window. REFER to LIFTGATE WINDOW GLASS . TEST the system for normal operation.

    • No  : Go to  H3.
  3. H3 CHECK CIRCUIT 15S-HB19 (GN/BU) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CJB C270a.
    • Measure the resistance between the CJB C270a pin 5, circuit 15S-HB19 (GN/BU), harness side and the heated rear window C402a, circuit 15S-HB19 (GN/BU), harness side.
      Fig 2: Checking Circuit 15S-HB19 (GN/BU) For An Open
      G03952855Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : INSTALL a new CJB. TEST the system for normal operation.
      • No  : REPAIR the circuit. TEST the system for normal operation.
  4. H4 CHECK THE HEATED REAR WINDOW GROUND CIRCUIT 
    • Key in OFF position.
    • Disconnect: Heated Rear Window C402b.
    • Measure the resistance between the heated rear window C402b, circuit 31-HB19 (BK), harness side and ground.
      Fig 3: Measuring Resistance Between Heated Rear Window C402b, Circuit 31-HB19 (BK), Harness Side And Ground
      G03952856Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
  5. H5 CHECK THE HEATED REAR WINDOW RELAY 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Relay C2021.
    • Carry out the heated rear window relay component test. Refer to COMPONENT TESTING .
    • Does the heated rear window relay pass the component test? 
      • Yes  : Go to  H6.
      • No  : INSTALL a new heated rear window relay. TEST the system for normal operation.
  6. H6 CHECK THE HEATED REAR WINDOW RELAY CONTROL 
    • Key in START position.
    • With the engine running, press the heated rear window switch to the ON position.
    • Measure the resistance between the heated rear window relay C2021 pin 85, circuit 31S-HB31 (BK/OG), harness side and ground.
      Fig 4: Measuring Resistance Between Heated Rear Window Relay C2021 Pin 85, Circuit 31S-HB31 (BK/OG), Harness Side And Ground
      G03952857Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : Go to  H9.
      • No  : Go to  H7.
  7. H7 CHECK THE HEATED REAR WINDOW RELAY CONTROL CIRCUIT 31S-HB31 (BK/OG) 
    • Key in OFF position.
    • Disconnect: Heater Control Module C2263.
    • Measure the resistance between the heated rear window relay C2021 pin 85, circuit 31S-HB31 (BK/OG), harness side and the heater control module C2263 pin 1, circuit 31S-HB31 (BK/OG), harness side.
      Fig 5: Checking Heated Rear Window Relay Control Circuit 31S-HB31 (BK/OG)
      G03952858Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : Go to  H13.
      • No  : Go to  H8.
  8. H8 CHECK CIRCUIT 31S-HB31 (BK/OG) FOR AN OPEN 
    • Disconnect: CJB C270a.
    • Measure the resistance between the CJB C270a pin 2, circuit 31S-HB31 (BK/OG), harness side and the heater control module C2263 pin 1, circuit 31S-HB31 (BK/OG), harness side.
      Fig 6: Checking Circuit 31S-HB31 (BK/OG) For An Open
      G03952859Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : INSTALL a new CJB. TEST the system for normal operation.
      • No  : REPAIR the circuit. TEST the system for normal operation.
  9. H9 CHECK THE POWER TO THE HEATED REAR WINDOW RELAY ON CIRCUIT 15-DA1 (GN/YE) 
    • Measure the voltage between the heated rear window relay C2021 pin 86, circuit 15-DA1 (GN/YE), harness side and ground.
      Fig 7: Checking Power To Heated Rear Window Relay On Circuit 15-DA1 (GN/YE)
      G03952860Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : Go to  H10.
      • No  : Go to  H11.
  10. H10 CHECK THE POWER TO THE HEATED REAR WINDOW RELAY ON CIRCUIT 30-DA1 (RD) 
    • Measure the voltage between the heated rear window relay C2021 pin 30, circuit 30-DA1 (RD), harness side and ground.
      Fig 8: Measuring Voltage Between Heated Rear Window Relay C2021 Pin 30, Circuit 30-DA1 (RD), Harness Side And Ground
      G03952861Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : INSTALL a new CJB. TEST the system for normal operation.
      • No  : Go to  H12.
  11. H11 CHECK CIRCUIT 15-DA1 (GN/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CJB C270e.
    • Key in ON position.
    • Measure the voltage between the CJB C270e pin 10, circuit 15-DA1 (GN/YE), harness side and ground.
      Fig 9: Measuring Voltage Between CJB C270e Pin 10, Circuit 15-DA1 (GN/YE), Harness Side And Ground
      G03952862Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : INSTALL a new CJB. TEST the system for normal operation.
      • No  : REPAIR the circuit. TEST the system for normal operation.
  12. H12 CHECK CIRCUIT 30-DA1 (RD) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CJB C270g.
    • Measure the voltage between the CJB C270g pin 1, circuit 30-DA1 (RD), harness side and ground.
      Fig 10: Measuring Voltage Between CJB C270g Pin 1, Circuit 30-DA1 (RD), Harness Side And Ground
      G03952863Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : INSTALL a new CJB. TEST the system for normal operation.
      • No  : REPAIR the circuit. TEST the system for normal operation.
  13. H13 CHECK FOR CORRECT HEATER CONTROL MODULE OPERATION 
    • Disconnect all the heater control module connections.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all the heater control module connections 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 heater control module. Refer to CONTROL COMPONENTS . 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. TEST the system for normal operation.
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