A/T - Revised Pressure Switches and Wiring Harnesses

90buick02

Bulletin: 90-7440-5

Date: Jan. 90

Ref. No.: 90-051-7440

Corp. Ref. No.: 977156


SUBJECT:
NEW WIRING HARNESSES AND PRESSURE SWITCHES

MODELS AFFECTED:
1990 CENTURY, LESABRE, PARK AVENUE, RIVIERA, REATTA AND REGAL EQUIPPED WITH THM 440T4/HYDRA-MATIC 4T60

Figure 1 - Wiring Diagram:

Figure 2 - Wiring Diagram:

Figure 3 - Wiring Diagram:

Figure 4 - Wiring Diagram:

BULLETIN COVERS: (Figures 1, 2, 3 and 4)

The 2nd, 3rd and 4th clutch circuit pressure switches will have "button-headed" wire connectors instead of blade type connectors for easier assembly at the transaxle assembly plant and to reduce the chance of the connectors working loose. This change also requires new wiring harnesses.

SERVICE PROCEDURE

The new pressure switches and wiring harnesses will be available for service.

DATE OF PRODUCTION CHANGE

Starting September 6, 1989 (Julian Date 249), some Hydra-Matic 4T60 (THM 440-T4) transaxles were built using the new pressure switches and wiring harnesses. Since early November, 1989, all models have the new pressure switches and wiring harnesses.








SERVICE PARTS INFORMATION


Parts are expected to be available on 12-15-89. Until then, normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be canceled as incorrectly ordered while the 400 control is in place.