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Pinpoint Test N: The Blower Motor Is Inoperative - EATC

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. 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 C1031.
    • Key in ON position.
    • Measure the voltage between blower motor C1031, circuit 181 (BR/OG) 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  N8.
  3. N3 CHECK CIRCUIT 57 (BK) 
    • Key in OFF position.
    • Disconnect: Blower Motor Speed Control C1308.
    • Measure the resistance between blower motor speed control C1308 pin 5, circuit 57 (BK) and ground.
      Fig 2: Checking Circuit 57 (BK)
      G03879198Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to N4.
    • No  : REPAIR circuit 57 (BK). TEST the system for normal operation.
  4. N4 CHECK CIRCUIT 261 (OG/BK) 
    • Measure the resistance between blower motor C1031, circuit 261 (OG/BK) and blower motor speed control C1308 pin 4, circuit 261 (OG/BK).
      Fig 3: Checking Circuit 261 (OG/BK)
      G03910183Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to N5.
    • No  : REPAIR circuit 261 (OG/BK). TEST the system for normal operation.
  5. N5 CHECK THE BLOWER MOTOR 
    • Connect: Blower Motor C1031.
    • Connect a fused jumper lead between blower motor speed control C1308 pin 4, circuit 261 (OG/BK) and pin 5, circuit 57 (BK).
      Fig 4: Checking Blower Motor
      G03879197Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the blower motor operate? 
    • Yes  : GO to N6.
    • No  : INSTALL a new blower motor. TEST the system for normal operation.
  6. N6 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • Removed the fused jumper lead from the blower motor speed control C1308.
    • Disconnect: EATC Module C228a.
    • Measure the resistance between EATC module C228a pin 10, circuit 261 (OG/BK) and blower motor speed control C1308 pin 3, circuit 261 (OG/BK); and measure the resistance between EATC module C228a pin 10, circuit 261 (OG/BK) and ground.
      Fig 5: Checking Circuit 261 (OG/BK) For An Open Or Short To Ground
      G03910185Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the EATC module and the blower motor speed control and greater than 10,000 ohms between the EATC module and ground? 
    • Yes  : GO to N7.
    • No  : REPAIR circuit 261 (OG/BK). TEST the system for normal operation.
  7. N7 CHECK THE EATC MODULE OUTPUT 
    • Connect: EATC Module C228a.
    • Connect: Blower Motor Speed Control C1308.
    • Key in ON position.

      Adjust the blower motor speed to HI.

    • Measure the voltage between EATC module C228a pin 10, circuit 261 (OG/BK) and ground by back-probing the EATC module C228a.
      Fig 6: Checking EATC Module Output
      G03910212Courtesy of FORD MOTOR CO.
    • Is the voltage within 2 volts of battery voltage? 
    • Yes  : INSTALL a new blower motor speed control. TEST the system for normal operation.
    • No  : INSTALL a new EATC module. TEST the system for normal operation.
  8. N8 CHECK CIRCUIT 181 (BR/OG) 
    • Key in OFF position.
    • Disconnect: Blower Motor Relay.
    • Measure the resistance between blower motor relay socket pin 87, circuit 181 (BR/OG) and blower motor C1031, circuit 181 (BR/OG).
      Fig 7: Checking Circuit 181 (BR/OG)
      G03889943Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to N9.
    • No  : REPAIR circuit 181 (BR/OG). TEST the system for normal operation.
  9. N9 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Measure the resistance between blower motor relay socket pin 85, circuit 57 (BK) and ground.
      Fig 8: Checking Circuit 57 (BK) For Open
      G03924389Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to N10.
    • No  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
  10. N10 CHECK THE EATC MODULE OUTPUT 
    • Key in ON position.
    • Measure the voltage between blower motor relay socket pin 85, circuit 57 (BK) and socket pin 86, circuit 399 (BR/YE).
      Fig 9: Checking The EATC Module Output
      G03888152Courtesy 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 N11.
  11. N11 CHECK CIRCUIT 399 (BR/YE) FOR SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: EATC Module C228a.
    • Key in ON position.
    • Measure the resistance between blower motor relay socket pin 86, circuit 399 (BR/YE) and ground.
      Fig 10: Measuring Resistance Between Relay Socket Pin 86, Circuit 399 And Ground
      G03915781Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to N12.
    • No  : REPAIR circuit 399 (BR/YE) for a short to ground. TEST the system for normal operation.
  12. N12 CHECK CIRCUIT 399 (BR/YE) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between EATC module C228a pin 23, circuit 399 (BR/YE) and blower motor relay socket pin 86, circuit 399 (BR/YE).
      Fig 11: Checking Circuit 399 (BR/YE) For Open
      G03924392Courtesy 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 399 (BR/YE) for an open. TEST the system for normal operation.
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