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Home >> Buick >> 2003 >> Century Custom >> Repair and Diagnosis >> External Pages >> Different car >> Section 386 (Cellular Communication System) >> Diagnostic Information and Procedures >> DTC B2476 >> Circuit Description >> Notes
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Circuit Description: Notes

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The OnStar® button assembly consists of three buttons, Call/Answer, OnStar® Call Center and OnStar® Emergency. Ten volts is supplied to the button assembly on the keypad supply voltage circuit. Each of the buttons, when pressed, completes the circuit across a resister allowing a specific voltage to be returned to the Vehicle Interface Unit (VIU) on the keypad signal circuit. Depending the voltage range returned, the VIU is able to identify which button has been pressed.

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