ELECTRICAL SYSTEMS MANUAL UPDATE-DELCO BOSE RADIO

MODELS AFFECTED: 1989 LESABRE-ELECTRA/PARK AVENUE

The 1989 Electrical Service Manual (ESM) does not show remove/replace procedures for Delco-Bose amplifiers and speakers. Please insert Page 298a, which accompanies this bulletin, following page 298 in your ESM.

Also, add the following changes on the pages indicated:

1. Page 295: Change the title of Test D. Make the new title: SPEAKER TEST.

2. Page 295: In Test F, change the last bullet condition at the bottom of the test to read:

"If all voltages are ok, do Test D, SPEAKER TEST. If speaker is ok, then replace amplifier inside suspect amplifier/speaker unit; see 4a or 5a replace procedure."

3. Page 298: In replacement procedure 4 ("Front Amplifier/Speaker Unit, Delco-Bose, Replace"), add Step 5 by writing in the following: "See replacement procedure 4a to replace Delco-Bnse front amplifier or speaker."

4. Page 298: In replacement procedure 5 ("Rear Amplifier/Speaker Unit, Delco-Bose, Replace"), add Step 4 by writing in the following: "See replacement procedure 5a to replace Delco-Bose rear amplifier or speaker."

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.