Test Point 3

Test point 3
Interior temperature sensor

Open circuit Short to ground

Fault code 22

Diagnosis conditions
No control module fault stored.
No fault with supply voltage (5 volts).
Outside temperature higher than - 40 °C.

Open circuit
1. Unplug connector A from the heating/air-conditioning control.
2. Connect ohmmeter to connectors A 10 and A 12.
Display: approx. 3 kohms at 23 °C

NOTE: The wires to the interior temperature sensor are routed via two additional plug connections on the heating/air-conditioning control.

3. Unplug connector from the interior temperature sensor.
4. Connect ohmmeter to connector A 10 and interior sensor connector pin 5.
Display: [<] 5 Ohms
5. Connect ohmmeter to connector A 12 and interior sensor connector pin 4.
Display: [<] 5 ohms
6. Connect voltmeter to connector A 10 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 A from the heating/air-conditioning control.
2. Connect ohmmeter to connector A 7 and ground.
Display: Infinity ohm

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