RAM 2500 Truck 4WD V10-8.0L VIN W (1997)
Brake Warning Indicator: Testing and Inspection
Anti-Lock Brake System Lamp Test
The diagnosis found here addresses an inoperative Anti-lock Brake System (ABS) lamp condition. If the ABS lamp stays on with the ignition switch in
the On position, or comes on and stays on while driving, refer to Brakes and Traction Control/Brakes for diagnosis. If no RWAL or ABS problem is
found, the following procedure will help locate a short or open in the ABS lamp circuit.
1. Disconnect and isolate the battery negative cable. Remove the instrument cluster bezel and the message center.
2. Connect the battery negative cable. Check for battery voltage between the fused ignition switch output circuit and the RWAL/ABS warning lamp
driver circuit cavities of the message center wire harness connector within five seconds of turning the ignition switch to the On position. If OK,
replace the faulty bulb. If not OK, go to Step 3.
3. Disconnect and isolate the battery negative cable. Unplug the RWAL/ABS control module wire harness connector. If the vehicle has ABS, unplug
the ABS lamp relay from the PDC. See the PDC label for relay location and identification. Check for continuity between the RWAL/ABS warning
lamp driver circuit cavity of the message center wire harness connector and a good ground. There should be no continuity. If OK, go to Step 4. If
not OK, repair the short circuit as required.
4. Check for continuity between the RWAL/ABS warning lamp driver circuit cavities of the message center wire harness connector and the
RWAL/ABS control module wire harness connector. There should be continuity If OK, refer to Brakes and Traction Control/Brakes to diagnose
the RWAL/ABS control module. If not OK, repair the open circuit as required.
