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Pinpoint Test M: The Defrost System Is Inoperative

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. M1 CHECK THE REM DTCS 
    • Retrieve the recorded results from the REM self-test.
    • Are any REM DTCs recorded? 
    1. Yes  : REFER to the REM DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
    2. No  : GO to M2.
  2. M2 CHECK THE REM OUTPUT 
    • Connect the diagnostic 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.
    • Did the heated rear window relay click when activated ON and OFF? 
    1. Yes  : GO to M3.
    2. No  : GO to  M6.
  3. M3 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 diagnostic 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, Circuit 15S-HB19 (GN/BU), Harness Side And Ground
      G03203489Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to M4.
    2. No  : GO to  M10.
  4. M4 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, Circuit 31-HB19 (BK/BU)
      G03203490Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to M5.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  5. M5 CHECK THE HEATED REAR WINDOW GRID 
    • Carry out the grid wire component test. Refer to COMPONENT TEST .
    • Did the heated rear window grid pass the component test? 
    1. Yes  : INSTALL a new DATC module, REFER to MODULE COMMUNICATIONS NETWORK - LS for the removal and installation procedure. REPEAT the self-test. If the heated rear window is still inoperative, INSTALL a new REM, REFER to MODULE COMMUNICATIONS NETWORK - LS for the installation and removal procedure. REPEAT the self-test. TEST the system for normal operation.
    2. No  : REPAIR the heated rear window grid, REFER to LEAD TERMINAL REPAIR . TEST the system for normal operation.
  6. M6 CHECK THE POWER 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: Measuring Voltage Between Heated Rear Window Relay C443-86, Circuit 30-HB23A (RD/WH)
      G03203491Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    1. Yes  : GO to M7.
    2. No  : GO to  M9.
  7. M7 CHECK THE HEATED REAR WINDOW RELAY 
    • Check the heated rear window relay.

      Refer to COMPONENT TESTING .

    • Did the heated rear window relay pass the component test? 
    1. Yes  : GO to M8.
    2. No  : INSTALL a new heated rear window relay. TEST the system for normal operation.
  8. M8 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: Measuring Resistance Between REM C420B-7, Circuit 91S-HB23 (BN/WH), Harness Side
      G03203492Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new DATC module, REFER to MODULE COMMUNICATIONS NETWORK - LS for the removal and installation procedure. REPEAT the self-test. If the heated rear window is still inoperative, INSTALL a new REM, REFER to MODULE COMMUNICATIONS NETWORK - LS for the removal and installation procedure. REPEAT the self-test. TEST the system for normal operation.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  9. M9 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
      G03203493Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : REPAIR circuit 30-HB23 (RD/WH). TEST the system for normal operation.
    2. No  : REPAIR the BJB input circuit. TEST the system for normal operation.
  10. M10 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, 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, Circuit 15S-HB19 (GN/BU) Harness Side
      G03203494Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to M11.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  11. M11 CHECK THE HEATED REAR WINDOW RELAY 
    • Check the heated rear window relay.

      Refer to COMPONENT TESTING .

    • Did the heated rear window relay pass the component test? 
    1. Yes  : REPAIR circuit 30-HB23 (RD/WH). TEST the system for normal operation.
    2. No  : INSTALL a new heated rear window relay. TEST the system for normal operation.
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