Air Flow Control Actuator and Its Circuit Inspection

Reference: AIR FLOW CONTROL ACTUATOR REMOVAL AND INSTALLATION: AUTO A/C 

1. Remove air flow control actuator from HVAC unit referring to AIR FLOW CONTROL ACTUATOR REMOVAL AND INSTALLATION: AUTO A/C .
2. Connect connector to air flow control actuator.
3. Set air flow selector to "BENT" position with ignition switch turned ON.
4. Connect voltage meter between terminal "2" and body ground.
5. Turn air flow selector to "DEF" position.
6. Measure output voltage variation while air flow control actuator is operated from "BENT" position (A) to "DEF" position (B) as following specification.

   If measure voltage is out of specification or does not vary linearly as the shown in graph, check related wire circuit and HVAC control module. If wire circuits and HVAC control module are OK, go to next step.

   Air flow control actuator output voltage 

   0.48 - 4.53 V (linear variation as following graph  )

   Fig 1: Checking Air Flow Control Actuator Output Voltage

   Courtesy of SUZUKI OF AMERICA CORP.
7. Set air flow selector of HVAC control module to "DEF" position with ignition switch turned ON, and make sure if the position of actuator lever is "DEF" position (A).
8. Turn ignition switch to OFF position, and then disconnect connector from air flow control actuator.
9. Measure resistance between terminal "1" and "2".

   Air flow control actuator resistance between terminal "1" and "2" (DEF position) (Reference value  )

   Approx. 0.45 kΩ at 25 °C (77 °F) 

   Fig 2: Checking Air Flow Control Actuator Resistance (DEF)

   Courtesy of SUZUKI OF AMERICA CORP.
10. Connect connector to air flow control actuator.
11. Set air flow selector of HVAC control module to "VENT" position with ignition switch turned ON, and make sure if the position of actuator lever is "VENT" position (B).
12. Turn ignition switch to OFF position, and then disconnect connector from air flow control actuator.
13. Measure resistance between terminal "1" and "2".

    Air flow control actuator resistance between terminal "1" and "2" (VENT position) (Reference value  )

    Approx. 4.3 kΩ at 25 °C (77 °F) 

    Fig 3: Checking Air Flow Control Actuator Resistance (VENT)

    Courtesy of SUZUKI OF AMERICA CORP.

    If measure resistance is out of specification, replace the actuator with new one.