For 1990-2009 cars

# PROM REPLACEMENT PROCEDURE INFORMATION

DUE TO THE RANDOM ORIENTATION OF THE PROM SOCKET TO ECM CIRCUIT BOARD, THE ALIGNMENT NOTCH IN THE SOCKET SHOULD BE DISREGARDED. TO BE SURE THE PROM IS ALIGNED PROPERLY, BE SURE THE END OF THE PROM HOLDER (WITH UPPER RAILS CUT BACK) GOES AWAY FROM THE PROM NOTCH. FIG. 9). NOTE THAT THE NOTCH IS LOCATED IN THE OPPOSITE END OF THE PROM HOLDER FROM COMPUTER COMMAND CONTROL ECM (FIG. 10). IF THE PROM IS INSTALLED INCORRECTLY, DAMAGE WILL OCCUR TO BOTH PROM AND ECM. EFI PROM REPLACEMENT PROCEDURES ARE SHOWN IN THE 1982 OMEGA AND CUTLASS CIERA SERVICE MANUAL, PAGE 6E2-48.

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.