Diagnostic help

The present fault code is erased directly the fault ceases. The historical fault codes are erased after 50 fault free driving cycles.

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.

• Emergency 2.8 V
• OnStar Services 1.6V
• White Dot 0.45 V