Mode Control Motor Test
NOTE: Before testing, check for HVAC DTCs.
  1. Disconnect the 7P connector from the mode control motor.
    Incorrectly applying power and ground to the mode control motor will damage it. Follow the instructions carefully.
  1. 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, and stop at Defrost. If it doesn't, reverse the connections; the mode control motor should run, and stop at Vent. When the mode control motor stops running, disconnect battery power immediately.
  1. If the mode control motor did not run in Step 2 , remove it, then check the mode control linkage and door for smooth movement.
    • If the linkage and door move smoothly, replace the mode control motor.
    • If the linkage or door sticks or binds, repair them as needed.
    • If the mode control motor runs smoothly, go to Step 4 .
  1. Measure the resistance between the No. 5 and No. 7 terminals of the mode control motor. It should be between 4.2 and 7.8 kΩ.
  1. Reconnect the mode control motor 7P connector, then turn the ignition switch to ON (II).
  1. Using the backprobe set, measure the voltage between the No. 3 and No. 7 terminals.
    Vent:
    About 0.5 V
    Defrost:
    About 4.5 V

  1. If either the resistance or voltage readings are not as specified, replace the mode control motor.