Ignition Switch Usage
WARNING: This page is about a different car, the 2002 Pontiac Grand Am and 2002 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
It is possible to set a serial data DTC Code with improper usage of ignition switch. If ignition key is held between ACCESSORY and ON positions for over 5 seconds, then rotated to ON and START sequentially, it is possible to set various DTC codes. Customer may see an illuminated Service Engine Soon, ABS and/or ETS OFF (Electronic Traction System) telltale. Next time ignition switch is cycled, any set DTC codes will be stored in history and any telltales will be turned off. If ETS OFF and ABS lights are illuminated, ABS and ETS systems will be deactivated for that key cycle. Normal functioning of these systems will resume with next key cycle.