Fault code 23: Diagnosis/troubleshooting

FAULT CODE 23 DIAGNOSIS PROCEDURE

Work instruction			Display OK	If not OK
1	Check temperature sensor	Switch off ignition Remove plug B from the climate control Measure resistance at plug B between pin 6 and pin 9	approx. 3 k (at 23 °C) Step 2	Step 5
2	Check wiring between climate control and temperature sensor for short to B+	Remove connector from temperature sensor Switch on ignition Measure voltage at plug B of the climate control between pin 6 and ground Measure voltage at plug B of the air-conditioning system regulator between pin 9 and ground	0 V Step 3	Repair wiring harness -> End
3	Check wiring between air-conditioning system regulator and temperature sensor for short to ground	Measure resistance at plug B of the air-conditioning system regulator between pin 6 and ground	Step 4	Repair wiring harness -> End
4	Check wiring between air-conditioning system regulator and temperature sensor for interruption	Measure resistance between plug B on the air-conditioning system regulator pin 9 and plug on interior temperature sensor pin 4 Measure resistance between plug B on the air-conditioning system regulator pin 6 and plug on interior temperature sensor pin 5	< 5 Step 6	Repair wiring harness -> End
5	Replace interior temperature sensor		->End
6	Replace air-conditioning system regulator		->End