2003 Acura MDX BaseFACTORY OEM SERVICE PROCEDURE

Recirculation Control Motor Test

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATIONΒ  ).
  1. Disconnect the 7P connector from the recirculation control motor.
    NOTE: Incorrectly applying power and ground to the recirculation control motor will damage it. Follow the instructions carefully.
  2. Connect battery power to the No. 1 terminal of the recirculation control motor, and ground the No. 2 terminal; the recirculation control motor should run smoothly, and stop at Fresh. If it doesn't, reverse the connections; the recirculation control motor should run smoothly, and stop at Recirculate. When the recirculation control motor stops running, disconnect battery power immediately.
    Fig 1: Identifying Recirculation Control Motor Connector Terminals
    G05487704Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. If the recirculation control motor did not run in step Β 2, remove it, then check the recirculation control linkage and door for smooth movement.
    • If the linkage and door move smoothly, replace the recirculation control motor (see RECIRCULATION CONTROL MOTOR REPLACEMENTΒ  ).
    • If the linkage or door stick or bind, repair them as needed.
    • If the recirculation control motor runs smoothly, go to step 4.
  4. Use a digital multimeter with an output of 1 mA or less at the 20 kΞ© range. With the recirculation control motor running as in step Β 2, check for continuity between the No. 3,4, and 5 terminals and the No. 7 terminal individually. There should be continuity for a moment at each terminal as the motor moves past the switch's terminal.
  5. If there is no continuity for a moment at each terminal, replace the recirculation control motor (see RECIRCULATION CONTROL MOTOR REPLACEMENTΒ  ).
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When to See a Mechanic

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

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