GM Service Manual Online
For 1990-2009 cars only

Object Number: 806223  Size: A1

The SECURITY light will come on when the key is turned to START, and will stay on until the vehicle starts.

It will also flash if the ignition key is too dirty or wet for the PASS-Key® II system to read the resistor pellet. See PASS-Key® II .

If the resistor pellet is damaged or missing, the light will come on.