Brakes - Repeat Code 10 RWAL
90chevy02Number: 89-285-5
Section: 5
Date: December 1989 Corporate Bulletin No.: 965013
Subject: REPEAT REAR WHEEL ANTI-LOCK (RWAL) CODE 10
Model and Year: 1988-89 C, K TRUCKS
FIGURE NO. 1:
TO: ALL CHEVROLET DEALERS
Some 1988 and 1989 C, K trucks may experience repeated RWAL Code 10 conditions. Code 10 may be set when the vehicle is travelling over 37 MPH and the RWAL module (ECU) sees an open circuit or no voltage at the stoplamp switch circuit. Regular service brakes and stoplamps continue to function normally, however, the stoplamps could stay on at times.
This condition has been corrected through the introduction of a revised stoplamp switch and cruise control release switch bracket into production. The VIN breakpoints are listed below. Internally the new stoplamp switch contains contact points which have been lengthened in order to allow more pedal travel before lighting the brake lamp. The new stoplamp switch can be identified externally by an additional rib that has been added to the side tab (see figure 1). The lower weld on the new cruise control release switch bracket has been moved .75 mm (1/32 inch) forward. The revised stoplamp switch and cruise control release switch bracket should be used ONLY in cases where brake switch adjustments have not corrected previous Code 10 conditions.
IMPORTANT: The stoplamp switch procedure does not change for the revised switch. The switch adjustment procedure is given in Service Bulletin 965001.
VIN Breakpoints:
OSHAWA 2GCEK19K0K1205982
FT. WAYNE 1GCDKL4K4KZ230782
PONTIAC 1GCDC14Z7KE229109
Parts Information
Part Number Description
15607063 Stoplamp Switch
15607068 Cruise Control Release
Switch Bracket
Parts are currently available from GMSPO.
For repairs to vehicles under warranty use:
Labor Operation Number: T8035
Labor Time: 0.3 Hrs.