Brake System Indicator      
The IPC illuminates the brake indicator when the following occurs:
|     •  | The body control module (BCM) detects that the park brake is engaged.
The IPC receives a class 2 message from the BCM requesting illumination.
   If the vehicle is shifted out of park with the park brake engaged, the
BCM    sends a class 2 message to the radio in order to activate an
audible    warning. | 
 
|     •  | The IPC detects a low brake fluid condition (signal circuit is
low). | 
 
|     •  | The IPC performs the displays test at the start of each ignition
cycle. The indicator illuminates for approximately 3 seconds. |