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The wires are...
Pin 2 - Class 2 Serial Data
Pin 4 - Ground (interior)
Pin 5 - Ground (underhood)
Pin 9 - Uart serial data (for the SDM, not on all models)
Pin 16 - +12v
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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