SERVICE MANUAL UPDATE SEC. 9J (SIR) DIAG. CHART REVISION

SUBJECT: SERVICE MANUAL UPDATE - SECTION 9J-A SIR DIAGNOSIS (REPLACE PAGE 9J-A-47)

VEHICLES AFFECTED: 1991 CORSICA/BERETTA

This bulletin is to replace page 9J-A-47 of the 1991 Corsica/Beretta Service Manual.

The information in the SIR diagnosis "Trouble Tree" Chart of Code 31 could lead the technician to misdiagnosis and unnecessary repairs.

In Step 1 the results are reversed. Before replacing the arming sensor, the technician should not have measured 30-40 volts between Terminal B and ground. The correct Chart follows:

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.