B350 1 Ton Van V6-239 3.9L (1990)
Hydraulic Control Assembly - Antilock Brakes: All Technical Service Bulletins
RWAL System - Warning Lamp ON, Code 4 Set
Models
1990 AB Bodies
Subject
R.W.A.L. Valve Harness Replacement - Failures Caused By Water Contamination In The R.W.A.L. Valve Connector
Index
BRAKES
Date
March 26, 1990
No.
05-03-90
(C05-04-0)
P-871
BODY CODE LEGEND
AB - RAM VAN/WAGON (RWD)
SYMPTOM/CONDITION
The amber anti-lock warning and red brake lamp illuminates and a Code 4 is present during diagnosis of the Rear Wheel Anti-Lock Brake System
(RWAL) on a subject vehicle. A possible cause is water contamination of the 4-way connector at the hydraulic valve (located inside the left front frame
rail near the front of the vehicle) and/or water contamination in the 50-way bulkhead connector.
PARTS REQUIRED
6 - Tie straps - P/N 6015756
1 - Kit P/N 83506386
Kit contents
1 - Jumper harness
4 - Insulators (connectors)
4 - Locking wedges
1 - Lubriplate grease
REPAIR PROCEDURE:
It is important to completely read this bulletin prior to performing this repair procedure. This procedure involves the replacement of part of the existing
RWAL harness with a service jumper harness that runs directly from the Instrument Panel side of the 50 way bulkhead connector to the RWAL valve.
1.
Disconnect the battery cables and remove the battery.
2.
Disconnect the 4-way harness connector from the RWAL valve pigtail wire connector. Look for any signs of water inside the RWAL pigtail
connector.
3.
If evidence of moisture is found, disassemble and dry the 4-way connector on the RWAL valve pigtail, be sure to remove the end seal for complete
drying.
4.
Apply lubriplate grease contained in the kit to the connector removed in step 3 both on the front and behind the end seal. This step must be
performed even if no moisture is present.
5.
Cut off the RWAL 4-way connector that comes from the main harness flush with the connector. Fold and tape the remaining wires to the main
harness. DO NOT CUT THE CONNECTOR ON THE RWAL VALVE SIDE.
