Circuit Description
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster calibrations are stored in the electronically erasable programmable read only memory (EEPROM). When the ignition switch is first turned to the ON position, the instrument cluster performs internal tests on the EEPROM and determines the integrity of its non-volatile memory.