A/T - Wiring Harness & Connector Pin Changes
Group Ref.: TransmissionBulletin No.: 377133
Date: November, 1993
INFORMATION
SUBJECT:
VEHICLE WIRING HARNESS AND TRANSAXLE PIN LOCATION CHANGES
MODELS:
1994 BUICK CENTURY, LESABRE, PARK AVENUE, REGAL AND SKYLARK
1994 CADILLAC DEVILLE AND SEVILLE
1994 CHEVROLET LUMINA, LUMINA APV, CORSICA AND BERETTA
1993-94 OLDSMOBILE CUTLASS SUPREME
1994 OLDSMOBILE ACHIEVA, CUTLASS CIERA, EIGHTY EIGHT, NINETY EIGHT, AND SILHOUETTE
1994 PONTIAC BONNEVILLE, GRAND AM, GRAND PRIX, AND TRANS SPORT
TRANSAXLE APPLICATIONS:
1994 HYDRA-MATIC 4T60-E (RPO M13)
TRANSAXLE MODELS:
ALL 1994, 3BHW
Start of Production 1994, (and 1993 pull-ahead model 3 BHW (used in the Oldsmobile Cutlass Supreme with 3.1L engine (RPO L82)) HYDRA-MATIC 4T60-E (RPO M13) transaxles have new vehicle wire harness and transaxle electrical connector (7 way) (35) pin-out sequence. The wire schematic modification from 1993-94 make the current transmission test harness J 38791-10 and J 38791-20 used on transmission test box (J 38791) obsolete for 1994.
The addition of the temperature sensor (450) in 1994 HYDRA-MATIC 4T60-E transaxles caused the need for the pin-outs to be completely overhauled. Since the temperature sensor required two pins on the electrical connector (7 way) and only one was available, it became necessary to combine the power source (12 volts) to one pin-out instead of the prior two pin-outs.
A new transmission test harness (J 38791-60) has been developed for all 1994 and 1993 pull-ahead models (3 BHW) HYDRA-MATIC 4T60-E transaxles. Failure to use test harness J 38791-60 on 1994 and 1993 pull-ahead models will cause erroneous outputs and may cause internal electrical transaxle damage.
SERVICE INFORMATION:
J 38791-60 will be shipped to all Chevrolet, Oldsmobile, and Cadillac dealers by December of 1993. Until J 38791-60 is available, ten (10) harnesses will be available on a loan basis under part number J 38791-60-LNR. These loaner harnesses are available by calling the Kent-Moore order department at 1-800-345-2233.
NOTE:
Pontiac does not consider J 38791 an essential tool. Instead, Pontiac uses Kent-Moore tool J 38835, Transaxle Electrical Jumper, to Diagnosis 4T60-E electrical concerns. No change to J 38835 is required due to the 1994 pin-out change. However, all technicians must be aware of the new pin-out sequence when diagnosing.