Driver's Air Mix 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 INFORMATION ).

Disconnect the 7P connector from the driver's air mix control motor.
NOTE: Incorrectly applying power and ground to the driver's air mix control motor will damage it. Follow the instructions carefully.
Connect battery power to the No. 1 terminal of the driver's air mix control motor, and ground the No. 2 terminal; 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
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 driver's air mix control motor runs smoothly, go to step 4.
Measure the resistance between the No. 5 and No. 7 terminals. It should be between 4.2 to 7.8 kΩ.
Reconnect the driver's air mix control motor 7P connector, then turn the ignition switch to ON (II).
Using the backprobe set, measure the voltage between the No. 3 and No. 5 terminals.
Max Cool: about 0.5 V

Max Hot: about 4.5 V
If either the resistance or voltage readings are not as specified, replace the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR REPLACEMENT ).