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Pinpoint Test F: The Blower Motor Is Inoperative

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 CHECK THE BLOWER MOTOR 
    • Key in OFF position.
    • Disconnect: Blower Motor C1031.
    • Connect battery voltage and ground to the blower motor.
      Fig 1: Checking Blower Motor
      G03276718Courtesy of FORD MOTOR CO.
    • Does the blower motor operate? 
    1. Yes  : GO to F2.
    2. No  : INSTALL a new blower motor (19805). TEST the system for normal operation.
  2. F2 CHECK FOR VOLTAGE TO THE BLOWER MOTOR 
    • Key in ON position.
    • Set the function selector switch in the FLOOR position.
    • Measure the voltage between the blower motor C1031, circuit 371 (PK/WH) and ground.
      Fig 2: Checking For Voltage To Blower Motor
      G03276719Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to F3.
    2. No  : GO to  F4.
  3. F3 CHECK CIRCUIT 261 (OG/BK) 
    • Key in OFF position.
    • Disconnect: Blower Motor Switch C294c.
    • Measure the resistance between the blower motor switch C294c pin 1, circuit 261 (OG/BK) and the blower motor C1031, circuit 261 (OG/BK).
      Fig 3: Checking Circuit 261 (OG/BK)
      G03276720Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new blower motor switch (18578). TEST the system for normal operation.
    2. No  : REPAIR circuit 261 (OG/BK). TEST the system for normal operation.
  4. F4 CHECK CIRCUIT 371 (PK/WH) 
    • Key in OFF position.
    • Disconnect: Blower Motor Relay C1011.
    • Measure the resistance between the blower motor C1031, circuit 371 (PK/WH) and the blower motor relay C1011 socket pin 30, circuit 371 (PK/WH).
      Fig 4: Checking Circuit 371 (PK/WH)
      G03276721Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to F5.
    2. No  : REPAIR circuit 371 (PK/WH). TEST the system for normal operation.
  5. F5 CHECK CIRCUIT 181 (BN/OG) 
    • Measure the voltage between the blower motor relay C1011 socket pin 87, circuit 181 (BN/OG) and ground.
      Fig 5: Checking Circuit 181 (BN/OG)
      G03276722Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to F6.
    2. No  : REPAIR circuit 181 (BN/OG). TEST the system for normal operation.
  6. F6 CHECK CIRCUIT 57 (BK) 
    • Key in OFF position.
    • Measure the resistance between the blower motor relay C1011 socket pin 85, circuit 57 (BK) and ground.
      Fig 6: Checking Circuit 57 (BK)
      G03276723Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to F7.
    2. No  : REPAIR circuit 57 (BK). TEST the system for normal operation.
  7. F7 CHECK FOR VOLTAGE TO THE BLOWER MOTOR RELAY, COIL SIDE 
    • Key in ON position.
    • Measure the voltage between the blower motor relay C1011 socket pin 86, circuit 260 (RD/OG) and ground.
      Fig 7: Checking For Voltage To Blower Motor Relay, Coil Side
      G03276724Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : INSTALL a new blower motor relay (14B192). TEST the system for normal operation.
    2. No  : GO to F8.
  8. F8 CHECK CIRCUIT 364 (BK/LG) 
    • Key in OFF position.
    • Disconnect: Function Selector Switch C294a.
    • Key in ON position.
    • Measure the voltage between the function selector switch C294a pin 3, circuit 364 (BK/LG) and ground.
      Fig 8: Checking Circuit 364 (BK/LG)
      G03276725Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to F9.
    2. No  : REPAIR circuit 364 (BK/LG). TEST the system for normal operation.
  9. F9 CHECK CIRCUIT 260 (RD/OG) 
    • Key in OFF position.
    • Measure the resistance between the function selector switch C294a pin 4, circuit 260 (RD/OG) and the blower motor relay C1011 socket pin 86, circuit 260 (RD/OG).
      Fig 9: Checking Circuit 260 (RD/OG)
      G03276726Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new function selector switch (19B888). TEST the system for normal operation.
    2. No  : REPAIR circuit 260 (RD/OG). TEST the system for normal operation.
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