Test Point 2

Test point 2
Outside temperature sensor
Open circuit
Short to ground

DTC 21

Diagnosis conditions
No control module fault stored.
No fault on the supply voltage (5 Volt).

Open circuit
1. Pull off connector A on the heating/air conditioning control.
2. Connect ohmmeter to connector A 7 and A 12.
Display: Approx. 1.2 kOhms at 23 °C

3. Pull off connector on the outside temperature sensor.
4. Connect ohmmeter to connector A 7 and pin 1 (connector, outside temperature sensor).
Display: 0 - 5 Ohms

5. Connect ohmmeter to connector A 12 and pin 2 (connector, outside temperature sensor).
Display: 0 - 5 Ohms

6. Connect voltmeter to connector A 7 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.