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Pinpoint Test N: The Blower Motor Is Inoperative - EATC: 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. N1 VERIFY THE BLOWER MOTOR OPERATION 
    • Key in ON position.
    • Press the PANEL button on the EATC module. Adjust the blower motor setting to LO and then to HI.
    • Is the blower motor inoperative in all settings? 
  2. N2 CHECK FOR VOLTAGE TO THE BLOWER MOTOR 
    • Key in OFF position.
    • Disconnect: Blower Motor C2004.
    • Key in ON position.
    • Measure the voltage between blower motor C2004-1, circuit 261 (OG/BK) and ground.
      Fig 1: Checking For Voltage To Blower Motor
      G03889942Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to N3.
    • No  : GO to  N9.
  3. N3 CHECK FOR VOLTAGE TO THE BLOWER MOTOR CONTROLLER 
    • Key in OFF position.
    • Disconnect: Blower Motor Speed Control C2185.
    • Key in ON position.
    • Measure the voltage between blower motor speed control C2185-4, circuit 261 (OG/BK) and ground.
      Fig 2: Measuring Voltage Between Blower Motor Speed Control C2185-4, Circuit 261 (OG/BK) And Ground
      G03992293Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to N4.
    • No  : REPAIR circuit 261 (OG/BK) for an open. TEST the system for normal operation.
  4. N4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between blower motor speed control C2185-1, circuit 1205 (BK) and ground.
      Fig 3: Measuring Resistance Between Blower Motor Speed Control C2185-1, Circuit 1205 (BK) And Ground
      G03992294Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to N5.
    • No  : REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.
  5. N5 CHECK CIRCUIT 515 (OG/RD) FOR AN OPEN 
    • Measure the resistance between blower motor C2004-2, circuit 515 (OG/RD) and blower motor speed control C2185-2, circuit 515 (OG/RD).
      Fig 4: Measuring Resistance Between Blower Motor C2004-2, Circuit 515 (OG/RD) And Blower Motor Speed Control C2185-2
      G03965235Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to N6.
    • No  : REPAIR circuit 515 (OG/RD) for an open. TEST the system for normal operation.
  6. N6 CHECK THE BLOWER MOTOR 
    • Connect: Blower Motor C2004.
    • Connect a fused jumper lead between blower motor speed control C2185-2, circuit 515 (OG/RD) and C2185-1, circuit 1205 (BK).
      Fig 5: Connecting Fused Jumper Lead Between Blower Motor Speed Control C2185-2 And C2185-1, Circuit 1205 (BK)
      G03992296Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the blower motor operate? 
    • Yes  : GO to N7.
    • No  : INSTALL a new blower motor. TEST the system for normal operation.
  7. N7 CHECK CIRCUIT 1120 (BK/WH) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Remove the fused jumper lead from blower motor speed control C271.
    • Disconnect: EATC Module C228b.
    • Measure the resistance between blower motor speed control C2185-3, circuit 1120 (BK/WH) and ground.
      Fig 6: Measuring Resistance Between Blower Motor Speed Control C2185-3, Circuit 1120 (BK/WH) And Ground
      G03992297Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to N8.
    • No  : REPAIR circuit 1120 (BK/WH) for a short to ground. TEST the system for normal operation.
  8. N8 CHECK CIRCUIT 1120 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between blower motor speed control C2185-3, circuit 1120 (BK/WH) and EATC module C228b-22, circuit 1120 (BK/WH).
      Fig 7: Measuring Resistance Between Blower Motor Speed Control C2185-3, Circuit 1120 (BK/WH) And EATC Module C228B-22
      G03992298Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new blower motor speed control. TEST the system for normal operation. If the blower motor is still inoperative, INSTALL a new EATC module. TEST the system for normal operation.
    • No  : REPAIR circuit 1120 (BK/WH) for an open. TEST the system for normal operation.
  9. N9 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Blower Motor Relay.
    • Measure the resistance between blower motor relay socket pin 87, circuit 261 (OG/BK) and blower motor C2004-1, circuit 261 (OG/BK).
      Fig 8: 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 N10.
    • No  : REPAIR circuit 261 (OG/BK) for an open. TEST the system for normal operation.
  10. N10 CHECK THE RELAY COIL SUPPLY VOLTAGE 
    • Measure the voltage between blower motor relay socket pin 85, circuit 296 (WH/VT) and ground.
      Fig 9: Measuring Voltage Between Relay Socket Terminal And Ground
      G03879193Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to N11.
    • No  : REPAIR circuit 296 (WH/VT) for an open. TEST the system for normal operation.
  11. N11 CHECK THE RELAY SWITCH POWER CIRCUIT FOR AN OPEN 
    • Measure the voltage between blower motor relay socket pin 30, circuit 364 (BK/LG) and ground.
      Fig 10: Measuring Voltage Between Relay Socket And Ground
      G03889960Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to N12.
    • No  : REPAIR circuit 364 (BK/LG) for an open. TEST the system for normal operation.
  12. N12 CHECK THE EATC MODULE OUTPUT 
    • Key in ON position.
    • Measure the voltage between blower motor relay socket pin 85, circuit 296 (WH/VT) and socket pin 86, circuit 1322 (BN/WH).
      Fig 11: 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 N13.
  13. N13 CHECK CIRCUIT 1322 (BN/WH) FOR SHORT TO A VOLTAGE 
    • Key in OFF position.
    • Disconnect: EATC Module C228b.
    • Key in ON position.
    • Measure the voltage between blower motor relay socket pin 86, circuit 1322 (BN/WH) and ground.
      Fig 12: Measuring Voltage Between Relay Connector And Ground
      G03888147Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    • Yes  : REPAIR circuit 1322 (BN/WH). TEST the system for normal operation.
    • No  : GO to N14.
  14. N14 CHECK CIRCUIT 1322 (BN/WH) FOR AN OPEN 
    • Measure the resistance between EATC module C228a-16, circuit 1322 (BN/WH) and blower motor relay socket pin 86, circuit 1322 (BN/WH).
      Fig 13: Measuring Resistance Between EATC Module C228A-16, Circuit 1322 (BN/WH) And Blower Motor Relay Socket Pin 86
      G03992283Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new EATC 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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