Circuit Description
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The ABS indicator is controlled by the EBCM. The EBCM supplies the ground to ABS indicator control circuit in order to keep the indicator off. When ABS indicator control circuit looses ground at the EBCM, the ABS indicator turns on.