Recent analysis of returned parts has shown that SIR (Supplemental inflatable Restraint) modules are being replaced because the horn switch is inoperative.
The horn switch is available in group 2.819, P/N 17990636. The SIR module, which includes the air bag and horn switch, is released in group 14.865.
Parts are currently available from GMSPO.
Please make sure your parts manager is aware of this bulletin.
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.