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Pinpoint Test L: The Blower Motor Is Inoperative - EMTC: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
  1. L1 CHECK CIRCUIT 752 (YE/RD) FOR GROUND 
    • 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 A/C blower motor connector C2004-2, circuit 752 (YE/RD) 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  L4.
    • No  : GO to L2.
  2. L2 CHECK CIRCUIT 752 (YE/RD) FOR AN OPEN 
    • Disconnect: Blower Motor Switch C294b.
    • Measure the resistance between blower motor switch C294b-2, circuit 752 (YE/RD) and blower motor C2004-2, circuit 752 (YE/RD).
      Fig 2: Measuring Resistance Between Connector Terminals
      G03965223Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to L3.
    • No  : REPAIR circuit 752 (YE/RD) for an open. TEST the system for normal operation.
  3. L3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Measure the resistance between blower motor switch C294b-1, circuit 1205 (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. TEST the system for normal operation.
    • No  : REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.
  4. L4 CHECK A/C BLOWER MOTOR CIRCUIT 261 (OG/BK) FOR VOLTAGE 
    • Key in ON position.
    • Measure the voltage between A/C blower motor connector C2004-1, circuit 261 (OG/BK) 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. TEST the system for normal operation.
    • No  : GO to L5.
  5. L5 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Blower Motor Relay.
    • Measure the resistance between blower motor relay connector pin 87, circuit 261 (OG/BK) and blower motor C2004-1, circuit 261 (OG/BK).
      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 L6.
    • No  : REPAIR circuit 261 (OG/BK) for an open. TEST the system for normal operation.
  6. L6 CHECK THE BLOWER MOTOR RELAY 
    • Connect: Blower Motor C2004.
    • Key in ON position.
    • Connect a fused jumper lead between blower motor relay socket pin 30, circuit 364 (BK/LG) and pin 87, circuit 261 (OG/BK).
      Fig 6: Connecting Fused Jumper Lead Between Relay Socket Terminals
      G03889944Courtesy of FORD MOTOR CO.
    • Does the blower motor operate? 
    • Yes  : GO to L7.
    • No  : REPAIR the relay power circuit. TEST the system for normal operation.
  7. L7 CHECK THE RELAY COIL SUPPLY VOLTAGE 
    • Key in OFF position.
    • Measure the voltage between blower motor relay socket pin 85, circuit 296 (WH/VT) and ground.
      Fig 7: Measuring Voltage Between Relay Socket Terminal And Ground
      G03879193Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to L8.
    • No  : REPAIR circuit 296 (WH/VT) for an open. TEST the system for normal operation.
  8. L8 CHECK THE BLOWER MOTOR RELAY 
    • Key in ON position.
    • Measure the voltage between blower motor relay socket pin 86, circuit 1322 (BN/WH) and socket pin 85, circuit 296 (WH/VT).
      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 L9.
  9. L9 CHECK CIRCUIT 1322 (BN/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: EMTC module C294a.
    • Measure the resistance between blower motor relay connector pin 86, circuit 1322 (BN/WH) and EMTC module C294a-23, circuit 1322 (BN/WH).
      Fig 9: Measuring Resistance Between Blower Motor Relay Connector Pin 86, Circuit 1322 (BN/WH) And EMTC Module C294A-23
      G03992283Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new EMTC module. TEST the system for normal operation.
    • No  : REPAIR circuit 1322 (BN/WH) for an open. TEST the system for normal operation.
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