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Key Identification and Usage

WARNING: This page is about a different car, the 2004 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Key Cut Positions & Depths
GM793164Courtesy of GENERAL MOTORS CORP.

The keys are double sided and reversible. The master key and valet key contain transponders that are read by the theft deterrent system when the keys are used in the ignition. The keys have 10 cut positions (1) with five different depths (2).

The keys that are furnished with the vehicle are: