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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1130 (Climate Control System - General Information And Diagnostics - (Except Hybrid)) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test I: No Operation in Some Blower Speeds >> Pinpoint Test I: No Operation In Some Blower Speeds

Pinpoint Test I: No Operation In Some Blower Speeds

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. I1 CHECK THE BLOWER MOTOR SPEEDS 
    • Key in ON position.
    • Turn the function selector switch to any position except OFF.
    • Cycle the blower motor switch from high to low several times.
    • Does the blower motor operate at all speeds? 
    1. YES  : If the blower motor operates correctly each time, ADVISE the owner of system operation.

      If the blower motor does not operate correctly each time, INSTALL a new blower motor switch. REFER to CLIMATE CONTROL article. TEST the system for normal operation.

    2. NO  : Go to  I2.
  2. I2 CHECK CIRCUIT 754 (LG/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Blower Motor Resistor C293
    • Disconnect: Blower Motor Switch C294b
      • Fig 1: Checking Circuit For Open
      GF0025669Courtesy of FORD MOTOR CO.
    • Measure the resistance between blower motor resistor C293-3, circuit 754 (LG/WH), harness side and blower motor switch C294b-c, circuit 754 (LG/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  I3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. I3 CHECK CIRCUIT 752 (YE/RD) FOR AN OPEN 
      Fig 2: Checking Circuit For Open
      GF0025670Courtesy of FORD MOTOR CO.
    • Measure the resistance between blower motor resistor C293-2, circuit 752 (YE/RD), harness side and blower motor switch C294b-d, circuit 752 (YE/RD), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  I4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. I4 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
      Fig 3: Checking Circuit For Open
      GF0025671Courtesy of FORD MOTOR CO.
    • Measure the resistance between blower motor resistor C293-1, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  I5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. I5 CHECK THE BLOWER MOTOR SWITCH 
    • Key in OFF position.
    • Measure the resistance of the blower motor switch, component side. Refer to the chart shown.
      BLOWER MOTOR SWITCH TEST

      Switch Position Terminals
      Low None
      M1 A and C only
      M2 A and D only
      High A and B only
    • Is the blower motor switch OK? 
    1. YES  : INSTALL a new blower motor resistor. TEST the system for normal operation.
    2. NO  : INSTALL a new blower motor switch. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
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