2009 Acura CSX Base, StandardFACTORY OEM SERVICE PROCEDURE

Driver's Air Mix Control Motor Test

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools Required 

Backprobe Set 07SAZ-001000A (2)

NOTE: Before testing the motor, check for HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION )
  1. Disconnect the 7P connector from the driver's air mix control motor
    NOTE: Incorrectly applying power and ground to the air mix control motor will damage it Follow the instructions carefully
  2. Connect battery power to terminal No 1 of the driver's air mix control motor, and ground terminal No 2, the driver's air mix control motor should run, and stop at Max Cool If it doesn't, reverse the connections, the driver's air mix control motor should run, and stop at Max Hot When the driver's air mix control motor stops running, disconnect battery power immediately
    Fig 1: Identifying Driver's Air Mix Control Motor Connector Terminals
    G05988689Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. If the driver's air mix control motor did not run in step 2, remove it, then check the driver's air mix control linkage and door for smooth movement
    • If the linkage and door move smoothly, replace the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR REPLACEMENT )
    • If the linkage or door sticks or binds, repair them as needed
    • If the air mix control motor runs smoothly, go to step 4
  4. Measure the resistance between terminals No 5 and No 7 of the driver's air mix control motor It should be between 4,2 and 7.8 kΩ
  5. Reconnect the air mix control motor 7P connector, then turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
  6. Using the backprobe set, measure the voltage between terminals No 3 and No 7

    Max Cool About 1.0 V 

    Max Hot About 4.0 V 

  7. If either the resistance or the voltage readings are not as specified, replace the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR REPLACEMENT )
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.