Brake System Indicator
WARNING: This page is about a different car, the 2009 Honda S2000, 2008 Honda S2000, 2007 Honda S2000, and 2006 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.
The brake system indicator comes on when the EBD function is lost, the parking brake is applied, and/or the brake fluid level is low.