Express 3/4 Ton Van V8-4.8L VIN V (2003)
Brake Warning Indicator: Description and Operation
Brake Warning Indicator
The Instrument Panel Cluster (IPC) illuminates the brake warning indicator when one or more of the following occurs:
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The body control module (BCM) detects that the park brake is engaged. The IPC receives a class 2 message from the BCM requesting
illumination.
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The electronic brake control module (EBCM) detects a low brake fluid condition. The IPC receives a class 2 message from the EBCM requesting
illumination.
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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.
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The EBCM detects an ABS malfunction which disables dynamic rear proportioning (DRP). The IPC receives a class 2 message from the EBCM
requesting illumination.
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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.
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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.
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The IPC detects a loss of class 2 communications with the BCM or with the EBCM.
Driver Information Indicators and Messages
The following indicators are used to inform the driver of several different factors.
Brake Warning Indicator
The Instrument Panel Cluster (IPC) illuminates the brake warning indicator when the following occurs.
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The Body Control Module (BCM) detects that the park brake is engaged. The IPC receives a serial data message from the BCM requesting
illumination. The brake warning indicator flashes at a rate of approximately twice per second when the park brake is engaged.
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The EBCM detects a low brake fluid condition or base brake pressure differential and sends a serial data message to the IPC requesting
illumination.
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The IPC performs the bulb check.
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The EBCM detects an ABS-disabling malfunction which also disables Dynamic Rear Proportioning (DRP) and sends a serial data message to the
IPC requesting illumination.
