Mode Control Motor Test (4-Door A/T Without Climate Control)

Mode Control Motor Test

4-door with A/T

NOTE: Before testing, check for HVAC DTCs. How to Troubleshoot the Heating and A/C Systems

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 the No. 1 terminal of the mode control motor, and ground the No. 2 terminal; the mode control motor should run smoothly, and stop at Defrost. If it doesn't, reverse the connections; the mode control motor should run smoothly, and stop at Vent. 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. With the mode control motor running as in step 2, check for continuity between the No. 7 terminal and the No. 3, 4, 5, and No. 6 terminals 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