Possible causes, elimination, notes

Diagnosis conditions 

No control module fault stored.

No fault with supply voltage (5 volts).

Outside temperature higher than - 30 °C.

Open circuit 

1. Unplug connectors A and B from the heating/air-conditioning control.
2. Connect ohmmeter to connectors A 12 and B 5.

   Display: approx. 2.8 kohm at 23 °C

3. Unplug connector from blower outlet sensor.
4. Connect ohmmeter to connector A 12 and blower outlet sensor connector pin 2.

   Display: < 5 ohm

5. Connect ohmmeter to connector B 5 and blower outlet sensor connector pin 1.

   Display: < 5 ohm

6. Connect voltmeter to connector B 5 and ground. Switch on ignition.

   Display: 0 volts

   If approx. 5 volts are displayed, check wiring harness for pinching and chafing damage.

Short to ground 

1. Unplug connector B from the heating/air-conditioning control.
2. Connect ohmmeter to connector B 5 and ground.

   Display: "INFINITY" ohm

   If 0 - 5 ohm is displayed, check wiring harness for pinching and chafing damage.