Test Point 2

Test point 2
Outside temperature sensor

Open circuit Short to ground

Fault code 21

Diagnosis conditions
No control module fault stored.
No fault with supply voltage (5 volts).

Open circuit
1. Unplug connector A from the heating/air-conditioning control.
2. Connect ohmmeter to connectors A 7 and A 12.
Display: approx. 1.2 kOhms at 23 °C
3. Unplug connector from the outside temperature sensor.
4. Connect ohmmeter to connector A 7 and pin 1 (connector of outside temperature sensor).
Display: 0 - 5 Ohms
5. Connect ohmmeter to connector A 12 and pin 2 (connector of outside temperature sensor).
Display: 0 - 5 Ohms
6. Connect voltmeter to connector A 7 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.