Brake Warning System Description and Operation for Chevrolet Express 2006
Brake Warning Indicator
The instrument panel cluster (IPC) illuminates the brake warning indicator
when one or more of 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. |
| • | The electronic brake control module (EBCM) detects a low brake
fluid condition. The IPC receives a class 2 message from the EBCM
requesting illumination. |
| • | The electronic brake control module (EBCM) detects a closed brake
pressure differential switch. The IPC receives a class 2 message
from the EBCM requesting illumination. |
| • | The EBCM detects an ABS malfunction which disables dynamic rear
proportioning (DRP). The IPC receives a class 2 message from the EBCM
requesting illumination. |
| • | The IPC detects a closed power brake booster alarm switch and
closed power brake booster fluid flow alarm switch. The IPC illuminates the
brake warning indicator and sends a class 2 message to the radio requesting
the brake warning alarm. |
| • | The IPC performs the bulb check at the start of each ignition
cycle. The brake warning indicator illuminates for approximately 3 seconds
before turning OFF. |
| • | The IPC detects a loss of class 2 communications with the
BCM or with the EBCM. |
