Diagnosis/troubleshooting
Test Point 1
Test point 1
Interface to the instrument cluster
Open circuit
Short to ground
DTC 20
Diagnosis conditions
No control module fault stored.
No fault on the supply voltage (terminal 15).
Open circuit
1. Pull off connector B on the heating/air conditioning control.
2. Pull off connector III on the instrument cluster.
3. Connect ohmmeter to connector B 13 and to connector III pin 26.
Display: < 5 Ohms
NOTE: The wire is routed via the 12-pole plug connection on the heater/ A/C unit.
Short to ground
1. Pull off connector B on the heating/air conditioning control.
2. Pull off connector III on the instrument cluster.
3. Connect ohmmeter to connector B 13 and ground.
Display: < Infinity Ohms
If 0 - 5 Ohms is displayed, check the wiring for pinching and chafing.
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 锟斤拷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.