B. Actuator Test

1. Place the ignition in the "RUN" position.

2. Be sure that the HVAC mode knob is in Face (or Bi-level) and blower knob at "Low" setting.

3. Open the wiTECH desktop application.

4. Starting at the "Vehicle View" screen, select "HVAC".

5. Select the "System Test" tab at the top of the screen.

6. Select "Actuator Calibration Test" from list.

7. With the windows rolled up, doors closed, radio off, blower on low, follow the wiTECH screen prompts to perform the actuator calibration test. While the actuator calibration test is running, listen for a ratcheting or snapping noise:

> If no ratcheting/snapping sound is heard, vehicles equipped with Manual Temperature Control (MTC) continue with Section C. Replace Face/Defrost Actuator. Vehicles equipped with Automatic Temperature Control (ATC), no further action is required.

> If ratcheting/snapping sound is heard, continue with Step 8 of this procedure.

8. Check for active DTC's. Replace all actuator(s) that displays an active DTC. Vehicles that are equipped with:

> MTC, continue with Section C. Replace Face/Defrost Actuator (MTC)

> ATC, continue with the appropriate Section in this document to replace the actuator(s) that have active DTC's.

NOTE:
If an active fault code of "Control Circuit Open" is present for any of the actuators, refer to standard diagnostic procedures. This condition is not addressed in this notification.