DTC 87: Brake Warning Light Circuit Open: Description
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1998 Suzuki X-90, 1998 Suzuki Sidekick, 1997 Suzuki X-90, 1997 Suzuki Sidekick, and 1996 Suzuki X-90. However, it is still accessible from the selected car via links, so may be relevant.
DTC 87 can be set after vehicle speed exceeds 5 MPH. A malfunction exists if BRAKE warning light circuit voltage is not within specification (indicating an open circuit).