quad driver code P1640 help

BUICK REGAL
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JONTHU193
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Electrical problem
1994 Buick Regal 6 cyl Front Wheel Drive Automatic 150K miles

Could someone please post a scan of a diagnostic flow chart for a cod P1640 on a 1994 Buick Regal with a 3.8 engine? I would like to find out what the quad driver that's throwing the code actually controls so I can troubleshoot the problem and not replace parts that do not need replacing. Thanks for any help.
Jan 24, 2009 at 1:47 AM
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BLUELIGHTNIN6
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https://images.2carpros.com/forum/automotive_pictures/261618_Noname_167.jpg


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Jan 24, 2009 at 2:30 AM