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Recirculation Control Motor Circuit Troubleshooting

WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check the No. 3 (7.5 A) fuse in the driver's underdash fuse/relay box.

    Is the fuse OK? 

    1. YES  - Go to step 2.
    2. NO  - Replace the fuse, and recheck.
  2. Disconnect the recirculation control motor 7P connector.
  3. Turn the ignition switch ON (II).
  4. Measure the voltage between the No. 1 terminal of the recirculation control motor 7P connector and body ground.
    Fig 1: Measuring Voltage Between No. 1 Terminal Of Recirculation Control Motor 7P Connector And Body Ground
    G03641844Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 5.
    2. NO  - Repair open in the wire between the No. 3 fuse in the driver's underdash fuse/relay box and the recirculation control motor.
  5. Turn the ignition switch OFF.
  6. Test the recirculation control motor (see RECIRCULATION CONTROL MOTOR TEST  ).

    Does the recirculation control motor test OK? 

    1. YES  - Go to step 7.
    2. NO  - Replace the recirculation control motor, or repair the recirculation control linkage or door.
  7. Disconnect climate control unit connector B (26P).
  8. Check for continuity between the No. 23 and No. 24 terminals of climate control unit connector B (26P) and body ground individually.
    Fig 2: Checking For Continuity Between No. 23 And No. 24 Terminals Of Climate Control Unit Connector B And Body Ground
    G03641845Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair any short to body ground in the wire(s) between the climate control unit and the recirculation control motor.
    2. NO  - Go to step 9.
  9. Turn the ignition switch ON (II), and check the same wires for voltage.
    Fig 3: Checking Wires For Voltage
    G03641846Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there any voltage? 

    1. YES  - Repair any short to power in the wire(s) between the climate control unit and the recirculation control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit.
    2. NO  - Go to step 10.
  10. Turn the ignition switch OFF.
  11. Check for continuity between the following terminals of climate control unit connector B (26P) and the recirculation control motor 7P connector.
    TERMINALS REFERENCE

    26P: 7P:
    No. 23 No. 5
    No. 24 No. 7
    Fig 4: Checking For Continuity Between Terminals Of Climate Control Unit Connector B And Recirculation Control Motor 7P Connector
    G03641847Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Check for loose wires or poor connections at climate control unit connector B (26P) and at recirculation control motor 7P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.
    2. NO  - Repair any open in the wire(s) between the climate control unit and the recirculation control motor.
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