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Home >> Pontiac >> 2008 >> Grand Prix Base >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> OnStar Button LED Inoperative >> Circuit/System Description
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Circuit/System Description

The vehicle communication interface module (VCIM) commands ON the red or green LED by supplying ground to either the keypad red signal circuit or keypad green signal circuit.