C 3500 HD Truck 2WD V8-8.1L VIN G (2002)
Brake Warning Indicator: Description and Operation
Brake Warning System Description and Operation (DRL Equipped)
Brake Warning Indicator
The Brake Warning Indicator illuminates when the when one or more of the following occurs:
^
The EBCM performs the bulb check. The EBCM applies ground to the ABS pressure differential sensor signal circuit.
^
The brake pressure differential switch is closed by a pressure differential between the front and rear brake circuits. The brake pressure differential
switch applies ground to the ABS pressure differential sensor signal circuit. In turn, the DRL Control Module applies ground to the brake warning
indicator control circuit.
^
The park brake is engaged. The park brake warning switch applies ground to the park brake switch signal circuit. In turn, the Daytime Running
Lamps (DRL) Control Module applies ground to the brake warning indicator control circuit.
^
The ignition is turned to START. The ignition switch applies ground to the park brake switch signal circuit. In turn, the DRL Control Module
applies ground to the brake warning indicator control circuit.
Brake Warning System Description and Operation (Without DRLs)
Brake Warning Indicator
The Brake Warning Indicator illuminates when the when one or more of the following occurs:
^
The EBCM performs the bulb check. The EBCM applies ground to the ABS pressure differential sensor signal circuit.
^
The brake pressure differential switch is closed by a pressure differential between the front and rear brake circuits. The brake pressure differential
switch applies ground to the ABS pressure differential sensor signal circuit.
^
The park brake is engaged. The park brake warning switch applies ground to the brake warning indicator control circuit.
