K 2500 Truck 4WD V8-350 5.7L (1991)
4WD Switch: Customer Interest
4WD Indicator Light - Inoperative/Cde 5 Set
GMC NUMBER:
91-8B-105
GROUP:
8B Chassis Electrical
DATE:
June, 1991
CORPORATE
NUMBER:
168201
SUBJECT:
INOPERATIVE 4WD INDICATOR LIGHT/RWAL CODE 5
MODELS:
1991 K1, K2, K3
Some 1991 K pickups may experience the 4wd indicator light not operating as intended, or an RWAL code 5. An electrical feedback condition may exist
during vehicle start up and cause the front axle engagement switch to become inoperative. This may keep the 4wd indicator light from coming on while
the truck is in 4wd, and it may not disable the RWAL system as intended when the truck is in 4wd. If the RWAL is activated while in 4wd, a diagnostic
code 5 may be set in the RWAL module. This disables the RWAL function and causes the brake warning light on the instrument panel to illuminate and
remain on.
To correct this condition, a jumper harness must be installed in addition to replacing the front axle engagement switch. Do NOT replace any RWAL
system components.
Notice:
Vehicles subject to campaign 91-C-05 may still experience this condition as well after campaign completion.
VEHICLES INVOLVED
All 1991 K pickups prior to the following VIN breakpoints are subject. Pontiac East Assembly:
GMC:
1GTGK24K1ME523066
Chevrolet:
1GCGK24K8ME168557
Fort Wayne
Assembly:
GMC:
1GTDK14K3MZ519462
Chevrolet:
1GCDC14Z8MZ169739
Oshawa Assembly:
GMC:
2GTEK19K6M1532000
Chevrolet:
2GCHK39N1M1191788
