ELECTRICAL SYSTEMS MANUAL UPD. DUAL A/C (REVISED DIAG. PROC.)

SUBJECT: DUAL AIR CONDITIONING (CJ2) - REVISED DIAGNOSIS PROCEDURES

VEHICLES AFFECTED: 1991-92 "C, H" MODELS

APPLICATION:

----------- 1991-92 Buick Park Avenue/Ultra 1991 Buick LeSabre

The diagnostic procedure found in the 1991-92 Park Avenue/Ultra and 1991 LeSabre Electrical Systems Manuals has been revised to avoid confusion and misdiagnosis of the Dual Air Conditioning system (CJ2).

The following diagnostic tests reflect these revisions:

ON-BOARD DIAGNOSTICS/DIAGNOSTIC CODES/ECC DATA LIST --------------------------------------------------- (1991 Park Avenue/Ultra - page 384)

E & C DATA LINE TEST

(1991 Park Avenue/Ultra - page 387) (1992 LeSabre - page 372 and 373) (1992 Park Avenue/Ultra - page 403 and 404)

PASSENGER TEMPERATURE OFFSET TEST

(1991 Park Avenue/Ultra - page 390) (1 992 Park Avenue/Ultra - page 406)

Please update your Electrical Systems Manual accordingly.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.