Shift Interlock System
WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For system description and repair information, see appropriate SHIFT INTERLOCK SYSTEMS article.