RAM 2500 Van V8-5.9L VIN Z (1997)
Brake Warning Indicator: Description and Operation
ABS Warning Lamp Description
SYSTEM OPERATION
The Anti-Lock Brake System (ABS) lamp gives the driver an indication when the standard Rear Wheel Anti-Lock (RWAL) or optional all-wheel
ABS system is faulty or inoperative. See the following description that applies to the brake system used on the vehicle being serviced.
Rear Wheel Anti-Lock
On vehicles equipped with the standard RWAL brake system, the ABS lamp is switched to ground by the RWAL control module. The RWAL
control module lights the lamp when the ignition switch is turned to the Start position as a bulb test. The lamp will stay on for about four
seconds after vehicle start-up to indicate that a system self-test is in progress.
If the ABS lamp remains on after start-up, or comes on and stays on while driving, it may indicate that the RWAL control module has detected
a system malfunction and/or that the RWAL system has become inoperative.
Anti-Lock Brake System
The optional all-wheel ABS lamp is grounded through the normally closed contacts of the de-energized ABS lamp relay When the ignition
switch is turned to the Start position, the lamp is lighted as a bulb test. The lamp will stay on for about four seconds after vehicle start-up to
indicate a system self- test is in progress. If the self-test is successfully completed, the ABS lamp relay is energized by the Controller Anti-lock
Brake (CAB) module, which turns the lamp off.
The CAB module energizes the ABS lamp relay to turn the ABS lamp off, and de-energizes the ABS lamp relay to turn the ABS lamp on. If
the ABS lamp remains on after start-up, or comes on and stays on while driving, it may indicate that the CAB module has detected a system
malfunction and/or that the ABS system has become inoperative.
