RepairPal Certified shops can diagnose and repair your 1996 Buick LeSabre. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Chances are you have problem with the passlock sensor. Please see the following RepairPal article for more information on GM theft systems - http://repairpal.com/gm-passlock-security-light-issues.
Hi
Most of the time you will find the problem in the igntion switch key cylinder. There is a pink wire that comes from the switch that faults. Hope this helps.
RJ