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Home >> Saab >> 2005 >> 9-5 Linear, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> ONSTAR - 9-5 >> Fault diagnosis, symptoms >> OnStar control button unit, one or more buttons are not functioning >> Diagnostic help

Diagnostic help

The control button unit incorporates three resistors connected in series which are supplied with 10 V from the VCIM. When a button is depressed the related resistor (button) is grounded and so generates the specific voltage/signal.

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