For 1990-2009 cars

# Information on Eliminating Noise in Audio System When Using Portable Playback Device

Subject: | Information on Eliminating Noise in Audio System When Using Portable Playback Device

Models: | 2008 and Prior GM Passenger Cars and Trucks (Including Saturn)

| 2008 and Prior HUMMER H2, H3

| 2005-2008 Saab 9-7X

This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 06-08-44-015 (Section 08 -- Body and Accessories).

Some portable audio equipment may be susceptible to certain types of electronic noise present in the vehicle's 12V power outlet.

Here are two ways to eliminate this type of interference:

• | If the audio device is capable of being self-powered (battery), use it that way instead of plugging it into the vehicle's power outlet.

• | Have the customer purchase a Ground Loop Isolator, such as *Radio Shack Catalog #270-054. This device plugs in between the radio and the customer's audio device. It is packed with one included Y-Adapter. If purchasing the *Radio Shack product, you will require an additional Y-Adapter (Catalog #274-369). This device should be installed between the audio player and the AUX input of the vehicle radio. These catalog numbers are stocked nationally at *Radio Shack Retail Stores in the U.S. and are currently available. Other similar products are available through other electronics or car stereo retailers defined as Ground Loop Isolators.

### Parts Information

Parts are currently available nationally in the U.S. through *Radio Shack retail locations or through the mail at Radio Shack direct ordering 1-800-843-7422. In Canada, parts are available nationally through *The Source By Circuit City retail locations or at www.thesourcecc.com.

Part Number | Description | Qty
--- | --- | ---
270-054 (U.S.) 2700054 (Canada) | Ground Loop Isolator | 1
274-369 (U.S.) 2740883 (Canada) | Y-Adapter | 1

*We believe these sources and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from these firms or for any such items that may be available from other sources.