RAM 3500 Van V8-5.2L VIN Y (1997)
ABS Light: Description and Operation
Rear Wheel Antilock Brakes
GENERAL INFORMATION
In the Rear Wheel Antilock (RWAL) brake system, as in other brake systems, the brake warning lamp (red) is used to alert the driver of a
hydraulic fault or that the parking brake is applied. However, in the RWAL system, the brake warning lamp is also used to alert the driver that
there is a problem with the RWAL system. There is also an ABS warning lamp (amber). The ABS warning lamp is only used to alert the driver of
RWAL malfunctions and to identify Diagnostic Trouble Codes (DTCs) stored in the Controller Antilock Brake (CAB) memory.
WARNING LAMP
The ABS warning lamp illuminates when ignition voltage is supplied to the bulb and a ground is provided for the bulb. The bulb has ignition
voltage supplied to it anytime the ignition switch is in the RUN or START positions. A ground for the bulb is provided by the CAB only. A circuit
in the CAB monitors the brake warning lamp switch and the ignition switch bulb check circuit (grounds the brake warning lamp bulb during the
START position). When the CAB identifies a ground on this circuit, the CAB illuminates the ABS warning lamp.
