Rear Air Mix Control Motor Test

Rear Air Mix Control Motor Test

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

1. Disconnect the 7P connector from the rear air mix control motor.

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


2. Connect battery power to the terminal No. 1 of the rear air mix control motor, and ground the terminal No. 2; the rear air mix control motor should run, and stop at Max Hot. If it doesn't, reverse the connections; the rear air mix control motor should run, and stop at Max Cool. When the rear air mix control motor stops running, disconnect battery power immediately.

3. If the rear air mix control motor did not run in step 2, remove it, then check the rear air mix control linkage and door for smooth movement.
- If the linkage and door move smoothly, replace the rear air mix control motor. Rear Air Mix Control Motor Replacement

- If the linkage or door sticks or binds, repair them as needed.

- If the rear air mix control motor runs smoothly, go to step 4.

4. Measure the resistance between the terminals No. 5 and No. 7. It should be between 4.2 to 7.8 kOhms.

5. Reconnect the rear air mix control motor 7P connector, then turn the ignition switch to ON (II).

6. Using the backprobe set, measure the voltage between the terminals No. 3 and No. 7.





7. If either the resistance or voltage readings are not as specified, replace the rear air mix control motor. Rear Air Mix Control Motor Replacement