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Pinpoint Test H: The Defrost System Is Inoperative - On Indicator

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK THE HEATED REAR WINDOW OPERATION 
    • Key in ON position.
    • Press the rear window defrost switch to ON.
    • Does the heated rear window operate? 

    Yes  : GO to H2.

    No  : GO to PINPOINT TEST E .

  2. H2 CHECK THE VOLTAGE TO THE REAR WINDOW DEFROST SWITCH INDICATOR 
    • Key in OFF position.
    • Disconnect: Rear Window Defrost Switch C241.
    • Key in ON position.
    • Enter the following diagnostic mode on the scan tool: DDM Active Command HEATED BACKLIGHT.
    • Measure the voltage between the rear window defrost switch C241-4, circuit 59 (DG/VT), harness side and ground.
      Fig 1: Measuring Voltage Between Rear Window Defrost Switch C241-4 And Ground
      G04586059Courtesy of FORD MOTOR CO.
    • Trigger RLY CNTRL ON.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to H3.

    No  : VERIFY the central junction box (CJB) fuse 32 (10A) is OK. If OK, GO to  H4.

  3. H3 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the rear window defrost switch C241-7, circuit 57 (BK), harness side and ground.
      Fig 2: Measuring Resistance Between Rear Window Defrost Switch C241-7, Circuit 57 (BK), Harness Side And Ground
      G04586060Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : INSTALL a new rear window defrost switch. TEST the system for normal operation.

    No  : REPAIR the circuit. TEST the system for normal operation.

  4. H4 CHECK CIRCUIT 186 (BN/LB) FOR AN OPEN 
    • Disconnect: CJB Fuse 32 (10A).
    • Measure the voltage between the input cavity of CJB fuse 32 (10A), circuit 186 (BN/LB) and ground.
      Fig 3: Measuring Voltage Between Input Cavity Of CJB Fuse 32 (10A), Circuit 186 (BN/LB) And Ground
      G04586061Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : REPAIR circuit 59 (DG/VT). TEST the system for normal operation.

    No  : REPAIR circuit 186 (BN/LB). TEST the system for normal operation.

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