Mode Control Motor Test

Mode Control Motor Test

NOTE: Before testing the motor, check for HVAC DTCs Initial Inspection and Diagnostic Overview.

1. Disconnect the 7P connector from the mode control motor.

NOTICE
Incorrectly applying power and ground to the mode control motor will damage it. Follow the instructions carefully.


2. Connect battery power to terminal No. 1 of the mode control motor, and ground terminal No. 2 ; the mode control motor should run smoothly, and stop at Vent. If it doesn't, reverse the connections; the mode control motor should run smoothly, and stop at Defrost. When the mode control motor stops running, disconnect battery power immediately.





3. If the mode control motor did not run in step 2, remove it, then check the mode control linkage and doors for smooth movement.

- If the linkage and doors move smoothly, replace the mode control motor Mode Control Motor Replacement.
- If the linkage or doors stick or bind, repair them as needed.
- If the mode control motor runs smoothly, go to step 4.

4. Use a digital multimeter with an output of 1 mA or less at the 20 kOhms range. Operate the mode control motor running as in step 2, and check for continuity between terminals No. 3, 4, 5, and No. 6 and terminal No. 7 individually. There should be continuity for a moment at each terminal as the motor moves through its travel.

5. If there is no continuity for a moment at each terminal, replace the mode control motor Mode Control Motor Replacement.