Brake Warning System Description and Operation for HUMMER H2 2009
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 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 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. |
