Circuit Description

WARNING: This page does not describe the selected car, but rather 54 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Sonoma, and 1999 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.

The EBCM microprocessor grounds the isolation coil to energize and close the valve. This will prevent any additional brake pressure applied by the driver from reaching the wheels. Each isolation valve operates independently to isolate each wheel.

Conditions for setting DTC:

Isolation time (pressure hold) exceeding 255 consecutive 1.0 second checks.
Isolation time (pressure hold) exceeds 120 seconds.