Park Brake Release

The rear integration module (RIM) controls the operation of the electric release park brake. The RIM uses serial data messages to determine if the correct conditions exist to release the park brake. The park brake is released under the following conditions:

• The engine is ON.
• The gear shift lever is not in Park or Neutral.
• The park brake switch is closed.

When all of the above conditions exist, the RIM releases the park brake by simultaneously activating the 2 park brake solenoids. After 2 seconds, the RIM deactivates solenoid A. The RIM continues to activate solenoid B while the above conditions exist, which prevents the park brake from being set.