Fault code 9120: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING FAULT CODE 9120

Work instruction			Display OK	If not OK
1	Visual inspection	Check outside temperature sensor for external damage Check plug connection for contact and corrosion	Step 2	Replace outside temperature sensor in the case of damage or repair plug connection ->End
2	Check output voltage of the instrument cluster	Switch off ignition Unplug connector from the outside temperature sensor Switch on ignition Measure voltage between pin 1 and pin 2 of the plug of the outside temperature sensor	approx. 3.4 V Step 6	Step 3
3	Check wire between instrument cluster and outside temperature sensor for short to ground	Switch off ignition Disconnect plug B from the instrument cluster Measure resistance between plug B on instrument cluster pin 1 and ground	Step 4	Repair wiring harness ->End
4	Check wires between instrument cluster and outside temperature sensor for short to B+	Switch on ignition Measure voltage between plug B on instrument cluster pin 1 and ground Measure voltage between plug B on instrument cluster pin 17 and ground	0 V Step 5	Repair wiring harness ->End
5	Check wires between instrument cluster and outside temperature sensor for open circuit	Switch off ignition Measure resistance between plug B on the instrument cluster pin 1 and plug on outside temperature sensor pin 1 Measure resistance between plug B on the instrument cluster pin 17 and plug on outside temperature sensor pin 2	< 5 Step 7	Repair wiring harness ->End
6	Replace outside temperature sensor		->End
7	Replace instrument cluster		->End