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Pinpoint Test Q: No Operation In Lower Speeds - Manual Climate Control

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. Q1 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Blower Motor Resistor C169.
    • Key in ON position.
    • Turn the function selector switch to the FLOOR position.
    • Measure the voltage between blower motor resistor C1032, circuit 261 (OG/BK) and ground.
      Fig 1: Checking Circuit 261 (OG/BK) For Open
      G03910199Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to Q2.
    • No  : REPAIR circuit 261 (OG/BK) for an open. TEST the system for normal operation.
  2. Q2 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between blower motor resistor connector C1032, circuit 57 (BK) and ground.
      Fig 2: Checking Circuit 57 (BK) For Open
      G03889952Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to Q3.
    • No  : REPAIR circuit 57 (BK) for an open circuit. TEST the system for normal operation.
  3. Q3 CHECK MEDIUM/LOW BLOWER CIRCUIT 754 (LG/WH) 
    • Turn the blower motor switch to the medium/low position.
    • Measure the resistance between blower motor resistor connector C1032, circuit 754 (LG/WH) and ground.
      Fig 3: Checking Medium/Low Blower Circuit 754 (LG/WH)
      G03910202Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to Q4.
    • No  : GO to  Q6.
  4. Q4 CHECK MEDIUM/HIGH BLOWER CIRCUIT 752 (YE/RD) 
    • Turn the blower motor switch to the medium/high position.
    • Measure the resistance between blower motor resistor connector C1032, circuit 752 (YE/RD) and ground.
      Fig 4: Checking Medium/High Blower Circuit 752 (YE/RD)
      G03910204Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new blower motor resistor. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : GO to Q5.
  5. Q5 CHECK CIRCUIT 752 (YE/RD) FOR AN OPEN 
    • Disconnect: Blower Motor Switch C294c.
    • Measure the resistance between blower motor resistor connector C1032, circuit 752 (YE/RD) and blower motor switch connector C294c, circuit 752 (YE/RD).
      Fig 5: Checking Circuit 752 (YE/RD) For Open
      G03910205Courtesy 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 752 (YE/RD) for an open. TEST the system for normal operation.
  6. Q6 CHECK CIRCUIT 754 (LG/WH) FOR AN OPEN 
    • Disconnect: Blower Motor Switch C294c.
    • Measure the resistance between blower motor resistor connector C1032, circuit 754 (LG/WH) and blower motor switch connector C294c, circuit 754 (LG/WH).
      Fig 6: Checking Circuit 754 (LG/WH) For Open
      G03889951Courtesy 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 754 (LG/WH) for an open. TEST the system for normal operation.
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