Park Brake
WARNING: This page is about a different car, the 2005 Saturn L300. However, it is still accessible from the selected car via links, so may be relevant.
When the park brake input circuit 1134 to the BCM is grounded, as when the parking brake is applied, the body control module (BCM) will turn ON the brake light in the instrument panel cluster (IPC) by sending a serial data message to the IPC.
If the vehicle is moving at greater than 3 mph (5 km/h) and the park brake input to the BCM is grounded, the BCM will sound the warning chime to notify the driver the parking brake is applied. DTC B0005 Park Brake Switch Circuit Low will set under these conditions.