SER. MANUAL UPDATE-CODE C553 PREVENT UNNECESSARY PARTS REPL

THE DIAGNOSTIC PROCEDURE FOR CODE C553 (PAGE 8D2-77 IN THE SERVICE INFORMATION MANUAL) IS BEING REVISED TO ELIMINATE UNNECESSARY CRT CONTROLLER REPLACEMENTS.

IMPORTANT: THE COLOR CRT MONITOR AND CONTROL MODULE IS REFERRED TO BY THE OWNER'S MANUAL AS "VISUAL INFORMATION CENTER" (VIC) AND BY THE GMSPO PARTS SYSTEM AS "DRIVER INFORMATION DISPLAY" (DID). THE VEHICLE ON- BOARD DIAGNOSTIC SYSTEM REFERS TO IT AS CRT. OBTAIN EXCHANGE PARTS FOR WARRANTY SERVICE BY CALLING ONE OF THE 26 AC-DELCO SHOPS LISTED IN OLDSMOBILE MANAGEMENT BULLETIN 91-I-14 (CORPORATE REFERENCE NUMBER 078304). THE EXCHANGE PROCEDURE IS DESCRIBED IN MANAGEMENT BULLETIN 90-I-12 (CORPORATE REFERENCE NUMBER 978305R).

IF CODE C553 IS SET AND THE CRT IS FUNCTIONING PROPERLY, DO NOT ATTEMPT ANY REPAIR. A FAULT INTERNAL TO THE CRT CONTROLLER CAUSES A FALSE CODE C553 TO SET THAT CANNOT BE CLEARED. THE CRT OPERATES NORMALLY WITH THIS FAULT.

IF THERE IS A COMPLAINT OF LOSS OF CRT DISPLAY, FOLLOW THE PROCEDURE IN FIGURE 1 TO DIAGNOSE.

THE SCHEMATIC FOR CODE C553 (PAGE 8D2-76) HAS BEEN REVISED TO CORRECT AN INCORRECT PIN NUMBER AND WIRE COLOR. REFER TO FIGURE 2 FOR THE CORRECT SCHEMATIC.

CUSTOMER SATISFACTION CADILLAC MOTOR CAR DIVISION GENERAL MOTORS CORPORATION

/LM

COPYRIGHT 1991 CADILLAC MOTOR CAR DIVISION, GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.

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.