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Pinpoint Test O: The Auxiliary Blower Motor Is Inoperative

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
  1. O1 CHECK SMART JUNCTION BOX (SJB) DTCS 
    • Key in ON position.
    • Check the SJB for DTCs.
    • Is DTC B2543, B2559 or B2688 present? 

    Yes 

    DTC B2543, REPAIR circuit 1348 (GY/OG) for a short to ground. TEST the system for normal operation. DTC B2559, CARRY OUT the relay component test on the auxiliary blower motor relay. If OK, REPAIR circuit 1371 (TN/OG) for a short to voltage. TEST the system for normal operation. DTC B2688, GO to O2.

    No 

    GO to  O3.

  2. O2 CHECK CIRCUIT 181 (BN/OG) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Auxiliary Blower Motor Relay.
    • Key in ON position.
    • Measure the voltage between the auxiliary blower motor relay socket pin 85, circuit 181 (BN/OG) and ground.
      Fig 1: Checking Circuit 181 (BN/OG) For Voltage
      G03245473Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes 

    CARRY OUT the relay component test on the auxiliary blower motor relay. If OK, REPAIR circuit 1371 (TN/OG) for an open. TEST the system for normal operation.

    No 

    REPAIR circuit 181 (BN/OG) for an open. TEST the system for normal operation.

  3. O3 CHECK AUXILIARY BLOWER SWITCH PID 
    • Turn the auxiliary blower motor switch to the HIGH position.
    • Check the auxiliary blower switch SJB PID.
    • Is the voltage greater than 3 volts? 

    Yes 

    GO to  O6.

    No 

    If the voltage is 0.5-2.9 volts, INSTALL a new rear auxiliary control. TEST the system for normal operation. If the voltage is less than 0.5 volts, GO to O4.

  4. O4 CHECK CIRCUIT 1348 (GY/OG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280f.
    • Disconnect: Rear Auxiliary Control C9025.
    • Measure the resistance between rear auxiliary control C9025-19, circuit 1348 (GY/OG) and SJB C2280f-5, circuit 1348 (GY/OG).
      Fig 2: Checking Circuit 1348 (GY/OG) For An Open
      G03245474Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to O5.

    No 

    REPAIR circuit 1348 (GY/OG) for an open. TEST the system for normal operation.

  5. O5 CHECK CIRCUIT 1349 (PK/LG) FOR AN OPEN 
    • Measure the resistance between rear auxiliary control C9025-8, circuit 1349 (PK/LG) and SJB C2280f-4, circuit 1349 (PK/LG).
      Fig 3: Checking Circuit 1349 (PK/LG) For An Open
      G03245475Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    CARRY OUT the component test on the rear auxiliary control. If OK, INSTALL a new SJB. TEST the system for normal operation.

    No 

    REPAIR circuit 1349 (PK/LG) for an open. TEST the system for normal operation.

  6. O6 CHECK CIRCUIT 536 (BK/LG) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Auxiliary Blower Motor C3021.
    • Key in ON position.
    • Measure the voltage between auxiliary blower motor C3021-1, circuit 536 (BK/LG) and ground.
      Fig 4: Checking Circuit 536 (BK/LG) For Voltage
      G03245476Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes 

    GO to O7.

    No 

    GO to  O12.

  7. O7 CHECK CIRCUIT 515 (OG/RD) FOR GROUND 
    • Measure the resistance between auxiliary blower motor C3021-2, circuit 515 (OG/RD) and ground.
      Fig 5: Check Circuit 515 (OG/RD) For Ground
      G03245477Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    INSTALL a new auxiliary blower motor. TEST the system for normal operation.

    No 

    GO to O8.

  8. O8 CHECK CIRCUIT 1205 (BK) FOR GROUND 
    • Key in OFF position.
    • Disconnect: Auxiliary Blower Motor Resistor C3022.
    • Measure the resistance between auxiliary blower motor resistor C3022-2, circuit 1205 (BK) and ground.
      Fig 6: Check Circuit 1205 (BK) For Ground
      G03245478Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    CARRY OUT the component test on the auxiliary blower motor resistor. If OK, GO to O9.

    No 

    REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.

  9. O9 CHECK CIRCUIT 751 (DB/WH) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Turn the auxiliary blower motor switch to the OFF position.
    • Measure the voltage between auxiliary blower motor resistor C3022-1, circuit 751 (DB/WH) and ground.
      Fig 7: Checking Circuit 751 (DB/WH) For A Short To Voltage
      G03245479Courtesy of FORD MOTOR CO.
    • Is voltage present? 

    Yes 

    GO to O10.

    No 

    REPAIR circuit 751 (DB/WH) for a short to voltage. TEST the system for normal operation.

  10. O10 CHECK CIRCUIT 752 (YE/RD) FOR A SHORT TO VOLTAGE 
    • Measure the voltage between auxiliary blower motor resistor C3022-3, circuit 752 (YE/RD) and ground.
      Fig 8: Checking Circuit 752 (YE/RD) For A Short To Voltage
      G03245480Courtesy of FORD MOTOR CO.
    • Is voltage present? 

    Yes 

    GO to O11.

    No 

    REPAIR circuit 752 (YE/RD) for a short to voltage. TEST the system for normal operation.

  11. O11 CHECK CIRCUIT 515 (OG/RD) FOR A SHORT TO VOLTAGE 
    • Measure the voltage between auxiliary blower motor resistor C3022-4, circuit 515 (OG/RD) and ground.
      Fig 9: Checking Circuit 515 (OG/RD) For A Short To Voltage
      G03245481Courtesy of FORD MOTOR CO.
    • Is voltage present? 

    Yes 

    REPAIR circuit 515 (OG/RD) for an open. TEST the system for normal operation.

    No 

    REPAIR circuit 515 (OG/RD) for a short to voltage. TEST the system for normal operation.

  12. O12 CHECK CIRCUIT 181 (BN/OG) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Auxiliary Blower Motor Relay.
    • Key in ON position.
    • Measure the voltage between the auxiliary blower motor relay socket pin 30, circuit 181 (BN/OG) and ground.
      Fig 10: Checking Circuit 181 (BN/OG) For Voltage
      G03245482Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes 

    CARRY OUT the relay component test on the auxiliary blower motor relay. If OK, REPAIR circuit 536 (BK/LG) for an open. TEST the system for normal operation.

    No 

    REPAIR circuit 181 (BN/OG) for an open. TEST the system for normal operation.

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