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Pinpoint Test K: The Blower Motor Is Inoperative - EMTC

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. K1 CHECK SMART JUNCTION BOX (SJB) DTCS 
    • Key in ON position.
    • Check the SJB for DTCs.
    • Is DTCB2513 or B2514 present? 

    Yes 

    DTC B2513, GO to  K10. DTC B2514, GO to  K13.

    No 

    GO to K2.

  2. K2 CHECK CIRCUIT 261 (OG/BK) FOR GROUND 
    • Key in OFF position.
    • Disconnect: Blower Motor C2004.
    • Turn the function selector switch to the vent position.
    • Turn the blower motor switch to the HIGH position.
    • Measure the resistance between the A/C blower motor connector C2004-2, circuit 261 (OG/BK) and ground.
      Fig 1: Measuring Resistance Between A/C Blower Motor Connector C2004-2 And Ground
      G03245432Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to  K5.

    No 

    GO to K3.

  3. K3 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN 
    • Disconnect: Blower Motor Switch C294b.
    • Measure the resistance between the blower motor switch C294b-2, circuit 261 (OG/BK) and blower motor C2004-2, circuit 261 (OG/BK).
      Fig 2: Measuring Resistance Between Blower Motor Switch C294b-2 And Blower Motor C2004-2
      G03245433Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to K4.

    No 

    REPAIR circuit 261 (OG/BK) for an open. TEST the system for normal operation.

  4. K4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Measure the resistance between the blower motor switch C294b-1, circuit 1205 (BK) and ground.
      Fig 3: Measuring Resistance Between Blower Motor Switch C294b-1 And Ground
      G03245434Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

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

    No 

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

  5. K5 CHECK A/C BLOWER MOTOR CIRCUIT 371 (PK/WH) FOR VOLTAGE 
    • Key in ON position.
    • Measure the voltage between the A/C blower motor connector C2004-1, circuit 371 (PK/WH) and ground.
      Fig 4: Measuring Voltage Between A/C Blower Motor Connector C2004-1 And Ground
      G03245435Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes 

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

    No 

    GO to K6.

  6. K6 CHECK CIRCUIT 371 (PK/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Blower Motor Relay.
    • Measure the resistance between the blower motor relay connector pin 87, circuit 371 (PK/WH) and the blower motor C2004-1, circuit 371 (PK/WH).
      Fig 5: Measuring Resistance Between Blower Motor Relay Connector Pin 87 And The Blower Motor C2004-1
      G03245436Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to K7.

    No 

    REPAIR circuit 371 (PK/WH) for an open. TEST the system for normal operation.

  7. K7 CHECK THE BLOWER MOTOR RELAY 
    • Connect: Blower Motor C2004.
    • Key in ON position.
    • Connect a fused jumper lead between the blower motor relay socket pin 30, circuit 364 (BK/LG) and pin 87, circuit 371 (PK/WH).
      Fig 6: Connecting Fused Jumper Lead Between Blower Motor Relay Socket Pin 30 And Pin 87
      G03245437Courtesy of FORD MOTOR CO.
    • Does the blower motor operate? 

    Yes 

    Single-zone EMTC only, carry out the relay component test on the blower motor relay. If OK, GO to K8. Dual-zone EMTC only, INSTALL a new blower motor relay. TEST the system for normal operation.

    No 

    REPAIR circuit 364 (BK/LG) for an open. TEST the system for normal operation.

  8. K8 CHECK CIRCUIT 1398 (PK/WH) FOR SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB C2280b.
    • Key in ON position.
    • Measure the voltage between EMTC module C294a-23, circuit 1398 (PK/WH) and ground.
      Fig 7: Measuring Voltage Between EMTC Module C294a-23 And Ground
      G03245438Courtesy of FORD MOTOR CO.
    • Is voltage present? 

    Yes 

    REPAIR circuit 1398 (PK/WH). TEST the system for normal operation.

    No 

    GO to K9.

  9. K9 CHECK CIRCUIT 1398 (PK/WH) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between EMTC module C294a-23, circuit 1398 (PK/WH) and the Smart Junction Box (SJB) C2280b-20, circuit 1398 (PK/WH).
      Fig 8: Measuring Resistance Between EMTC Module C294a-23 And The Smart Junction Box (SJB) C2280b-20
      G03245439Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    INSTALL a new SJB. TEST the system for normal operation.

    No 

    REPAIR circuit 1398 (PK/WH) for an open. TEST the system for normal operation.

  10. K10 CHECK THE RELAY COIL SUPPLY VOLTAGE 
    • Key in OFF position.
    • Disconnect: Blower Motor Relay.
    • Key in ON position.
    • Measure the voltage between the blower motor relay socket pin 85, circuit 298 (VT/OG) and ground.
      Fig 9: Measuring Voltage Between Blower Motor Relay Socket Pin 85 And Ground
      G03245440Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes 

    GO to K11.

    No 

    REPAIR the circuit. TEST the system for normal operation.

  11. K11 CHECK THE BLOWER MOTOR RELAY 
    • Key in ON position.
    • Measure the voltage between the blower motor relay socket pin 85, circuit 298 (VT/OG) and socket pin 86, circuit 1322 (BN/WH).
      Fig 10: Measuring Voltage Between Blower Motor Relay Socket Pin 85 And Socket Pin 86
      G03245441Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes 

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

    No 

    GO to K12

  12. K12 CHECK CIRCUIT 1322 (BN/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280c.
    • Measure the resistance between the blower motor relay connector pin 86, circuit 1322 (BN/WH) and the Smart Junction Box (SJB) C2280-14, circuit 1322 (BN/WH).
      Fig 11: Measuring Resistance Between Blower Motor Relay Connector Pin 86 And The Smart Junction Box (SJB) C2280-14
      G03245442Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    INSTALL a new SJB. TEST the system for normal operation.

    No 

    REPAIR circuit 1322 (BN/WH) for an open. TEST the system for normal operation.

  13. K13 CHECK CIRCUIT 1322 (BN/WH) FOR SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: SJB C2280c.
    • Disconnect: Blower Motor Relay.
    • Key in ON position.
    • Measure the voltage between the blower motor relay socket pin 86, circuit 1322 (BN/WH) and ground.
      Fig 12: Measuring Voltage Between Blower Motor Relay Socket Pin 86 And Ground
      G03245443Courtesy of FORD MOTOR CO.
    • Is voltage present? 

    Yes 

    REPAIR circuit 1322 (BN/WH). TEST the system for normal operation.

    No 

    CARRY OUT the relay component test on the blower motor relay. If OK, INSTALL a new SJB. TEST the system for normal operation.

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