INFORMATION ON NEW PROCEDURE FOR OBTAINING DRACS. GMC Truck S15 Pickup

SUBJECT: INFORMATION ON NEW PROCEDURE FOR OBTAINING SERVICE DRACS (DIGITAL RATIO ADAPTOR/CONTROLLER)

MODELS: 1989-94 CHEVROLET AND GMC TRUCK M/L VANS, S/T TRUCKS 1990-94 CHEVROLET AND GMC TRUCK G VANS, R/V TRUCKS 1992-94 CHEVROLET AND GMC TRUCK C/K TRUCKS 1991-94 OLDSMOBILE BRAVADA

IF A DEALER IS CONTACTED ABOUT OR IS IN NEED OF A SERVICE DRAC (DIGITAL RATIO ADAPTOR/CONTROLLER) FOR ANY OF THE FOLLOWING REASONS:

1. RADIO INTERFERENCE (EMI) 2. SPEEDOMETER FLUCTUATION OR FLARING 3. ERRATIC/SURGING CRUISE CONTROL OPERATION 4. DIFFERENT TIRE SIZE 5. DEFECTIVE PART

THE DEALER MUST CONTACT AN AC-DELCO SERVICE CENTER AUTHORIZED TO REPAIR ELECTRONIC INSTRUMENT CLUSTERS FOR A NEW SERVICE DRAC, P/N 16202915.

NOTE: THIS PART IS A SERVICE PART AND HAS TO BE PROGRAMMED FOR THE VEHICLE. IT CANNOT BE USED UNTIL THIS PROCEDURE HAS BEEN DONE BY THE AUTHORIZED SERVICE CENTER.

THE DEALER WILL NEED THE P/N AND THE BROADCAST CODE (THE 3 BOLD LETTERS LOCATED ON THE PRINTED LABEL OF THE OLD DRAC). THE SERVICE CENTER WILL PROGRAM THE DRAC ACCORDING TO THIS INFORMATION.

IF THE CUSTOMER IS CHANGING THE TIRE SIZE, THE SERVICE CENTER WILL NEED THE AXLE RATIO AND TIRE SIZE IN ORDER TO PROGRAM THE DRAC TO THE NEW TIRE SPECIFICATIONS. THE AC-DELCO SERVICE CENTER WILL SEND THE PROGRAMMED DRAC VIA COMMON CARRIER TO THE DEALERSHIP.

FOR FURTHER INFORMATION, CONSULT THE AC-DELCO AUTHORIZED SERVICE CENTER MANUAL WA-2 (SEPTEMBER 1990 OR LATER). AC-DELCO CENTERS ARE SUBJECT TO CHANGE.

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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.