GARBLED BASS FROM UM6 AND UM7 RADIOS W/UX7 SPEAKERS-NEW P/N

Subject: GARBLED BASS FROM UM6, UM7 RADIOS WITH UX7 SPEAKERS (NEW FRONT DOOR SPEAKER)

Models Affected: 1992 BONNEVILLE MODELS -----------------------------------------------------------------------------

CONDITION:

---------- Two conditions may exist on some vehicles where the base speaker system (UX7) when coupled with base radios (UM6, UM7) may cause a distorted or garbled sound from the front door speakers when bass notes appear in the music being played.

CORRECTION:

----------- Start of production through N1238278. Vehicles produced in this VIN range have UM6 or UM7 radios that were capable of putting out too much bass when the control was in the 3/4 to full up position. To repair this condition, the radio must be sent to an authorized AC Delco repair station. Radios with the correction can be identified by a red mark through the "2" in the serial number label.

Start of Production through N1252000. Vehicles built within this VIN range cannot handle the excessive bass produced by the radio. A new 4" X 6" front door speaker (Part No. 16174879) has been released for service. This speaker has a 220 mfd. capacitor soldered across terminals at the connector. Check both front door speakers for this latest change and replace as required.

Parts are expected to be available on January 20, 1992. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.

WARRANTY INFORMATION:

Labor Operation No.:

Radio R and R: R0750 .3 hr.

Speaker Replace Right R0940 .6 hr.

Speaker Replace Left R0941 .6 hr.

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.