Mode Control Motor Test
NOTE:
Before testing, check for HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION
).
- Disconnect the 7P connector from the mode control motor.NOTE: Incorrectly applying power and ground to the mode control motor will damage it. Follow the instructions carefully.
- 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.
- 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.
- If the linkage or doors stick or bind, repair them as needed.
- If the mode control motor runs smoothly, go to step 4.
- Use a digital multimeter with an output of 1 mA or less at the 20 kΩ range. With the mode control motor running as in step 2, check for continuity between terminals No. 3, 4, 5, 6 and terminal No. 7 individually. There should be continuity for a moment at each terminal as the motor moves through its travel.
- If there is no continuity for a moment at each terminal, replace the mode control motor.