RAM 2500 Van V8-5.9L VIN Z (1997)
Brake Warning Indicator: Description and Operation
ABS Warning Lamp Circuit Operation
Four Wheel Antilock Brakes
CIRCUIT OPERATION
The Controller, Anti-Lock Brakes (CAB) provides ground for the ABS warning lamp in the message center through the normally closed contacts
in the ABS warning lamp relay When the ignition switch is in the START position, the lamp illuminates as a bulb test for approximately 3 to 5
seconds while the CAB performs a system self-test. While closed, the relay contacts complete the ground path for the ABS warning lamp by
connecting circuit G19 from the lamp to ground on circuit Z1. Power for the lamp is supplied by circuit G5.
If the system self-test is successfully completed, the CAB energizes the ABS warning lamp relay by providing ground for the relay coil on circuit
B47. When the relay energizes, its contacts open and disconnect circuits G19 and Z1. Circuit A20 from fuse 5 in the fuse block supplies power to
the coil side of the relay.
Circuit G19 from the ABS warning lamp in the message center is double crimped at the bulk head connector. One branch of circuit G19 connects
to the ABS warning lamp relay The other branch of circuit G19 connects to the CAB.
Rear Wheel Antilock Brakes
CIRCUIT OPERATION
The RWAL control module provides ground for the message center CHECK ANTI-LOCK warning lamp on circuit B102. Circuit G5 provides
voltage to the message center to feed the warning lamp.
