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Pinpoint Test G: The Blower Motor Is Inoperative

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  1. G1 CHECK BLOWER MOTOR GROUND 
    • Disconnect: Blower Motor C1227.
    • Turn the blower motor switch to the HIGH position.
    • Measure the resistance between A/C blower motor C1227-1, circuit 261 (OG/BK) and ground.
      Fig 1: Measuring Resistance Between A/C Blower Motor Connector And Ground
      G03910194Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  G4.
    • No  : GO to G2.
  2. G2 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN 
    • Disconnect: Blower Motor Switch C294b.
    • Measure the resistance between blower motor switch C294b-1, circuit 261 (OG/BK) and blower motor C1227-1, circuit 261 (OG/BK).
      Fig 2: Measuring Resistance Between Blower Motor Switch & Blower Motor
      G03910178Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to G3.
    • No  : REPAIR circuit 261 (OG/BK) for an open. TEST the system for normal operation.
  3. G3 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Measure the resistance between blower motor switch C294b-2, circuit 57 (BK) and ground.
      Fig 3: Measuring Resistance Between Connector And Ground
      G03924378Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new blower motor switch. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
  4. G4 CHECK A/C BLOWER MOTOR CIRCUIT 515 (OG/RD) FOR VOLTAGE 
    • Key in ON position.
    • Measure the voltage between A/C blower motor C1227-2, circuit 515 (OG/RD) and ground.
      Fig 4: Checking For Voltage To Blower Motor
      G03889942Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : INSTALL a new blower motor. REFER to HEATING & VENTILATION . TEST the system for normal operation.
    • No  : GO to G5.
  5. G5 CHECK CIRCUIT 515 (OG/RD) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Blower Motor Relay.
    • Measure the resistance between blower motor relay connector pin 87, circuit 515 (OG/RD) and blower motor C1227-2, circuit 515 (OG/RD).
      Fig 5: Measuring Resistance Between Blower Motor Relay Connector And Blower Motor Connector
      G03889943Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to G6.
    • No  : REPAIR circuit 515 (OG/RD) for an open. TEST the system for normal operation.
  6. G6 CHECK THE BLOWER MOTOR RELAY 
    • Connect: Blower Motor C1227.
    • 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 515 (OG/RD).
      Fig 6: Connecting Fused Jumper Lead Between Relay Socket Terminals
      G03889944Courtesy of FORD MOTOR CO.
    • Does the blower motor operate? 
    • Yes  : GO to G7.
    • No  : VERIFY the battery junction box (BJB) fuse 17 (50A) is OK. If OK, REPAIR circuit 364 (BK/LG) for an open. TEST the system for normal operation.
  7. G7 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between blower motor relay socket pin 86, circuit 57 (BK) and ground.
      Fig 7: Measuring Resistance Between Blower Motor Relay Socket Pin 86 And Ground
      G03945091Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to G8.
    • No  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
  8. G8 CHECK THE BLOWER MOTOR RELAY 
    • Key in ON position.
    • Measure the voltage between blower motor relay socket pin 85, circuit 753 (YE/RD) and socket pin 86, circuit 57 (BK).
      Fig 8: Measuring Voltage Between Relay Socket Terminals
      G03879192Courtesy 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 G9.
  9. G9 CHECK CIRCUIT 753 (YE/RD) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between blower motor relay connector pin 85, circuit 753 (YE/RD) and function selector switch C294a-3, circuit 753 (YE/RD).
      Fig 9: Measuring Resistance Between Blower Motor Relay Connector And Function Selector Switch
      G03889947Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to G10.
    • No  : REPAIR circuit 753 (YE/RD) for an open. TEST the system for normal operation.
  10. G10 CHECK CIRCUIT 489 (PK/BK) FOR VOLTAGE 
    • Key in ON position.
    • Measure the voltage between blower motor switch C294a-4, circuit 489 (PK/BK) and ground.
      Fig 10: Measuring Voltage Between Blower Motor Switch And Ground
      G03889948Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : INSTALL a new function selector switch. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : VERIFY the central junction box (CJB) fuse 13 (15A) is OK. REPAIR circuit 489 (PK/BK) for an open. TEST the system for normal operation.
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