Test Point 3

Test point 3
Interior temperature sensor
Open circuit
Short to ground

DTC 22

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

Open circuit
1. Pull off connector A on the heating/air conditioning control.
2. Connect ohmmeter to connector 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. Pull off connector on 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 Volt

If approx. 5 Volt is displayed, check the wiring for pinching and chafing.

Short to ground
1. Pull off connector A on the heating/air conditioning control.
2. Connect ohmmeter to connector A 7 and ground.
Display: Infinity Ohms

If 0 - 5 Ohms is displayed, check the wiring for pinching and chafing.