Possible causes, elimination, notes

Diagnosis conditions 

No control module fault stored.

No fault with supply voltage (5 volts).

Signal implausible 

1. Check outside air / recirculation valve for smooth operation.
2. Unplug connectors A, B, C and D from the heating/air-conditioning control.
3. Unplug connector from outside air / recirculation valve drive motor.
4. Connect ohmmeter to connector D 13 and drive motor connector pin 1.

   Display: < 5 ohm

   Connect ohmmeter to connector D 5 and drive motor connector pin 2.

   Display: < 5 ohm

   Connect ohmmeter to connector B 17 and drive motor connector pin 3.

   Display: < 5 ohm

   Connect ohmmeter to connector C 8 and drive motor connector pin 4.

   Display: < 5 ohm

   Connect ohmmeter to connector A 12 and drive motor connector pin 5.

   Display: < 5 ohm

5. Check wire from connector D 13 to drive motor pin 1 for short to B+ and short to ground.
6. Check wire from connector D 5 to drive motor pin 2 for short to B+ and short to ground.
7. Check wire from connector B 17 to drive motor pin 3 for short to B+ and short to ground.
8. Check wire from connector C 8 to drive motor pin 4 for short to B+ and short to ground.
9. Check wire from connector A 12 to drive motor pin 5 for short to B+ and short to ground.