Audio System

[GRRRR8]

Audio System - Whine From Speakers When Using OnStar®

TECHNICAL

Bulletin No.: 07-08-46-002A

Date: February 26, 2008

Subject:
Audio Whine Noise from Radio Speakers When Using OnStar® (Install Noise Suppression Filter)

Models:
2007-2008 GM Passenger Cars and Trucks (Including Saturn)
2007-2008 HUMMER H2, H3
2007-2008 Saab 9-7X

with OnStar (RPO UE1)

Supercede:

This bulletin is being revised to update the circuit descriptions in the correction statement. Please discard Corporate Bulletin Number 07-08-46-002 (Section 08 - Body & Accessories).

Condition

Some customers may comment on an audio whine coming from the radio speakers when using the OnStar® system. The amplitude and frequency of the whine will change with an increase or decrease in engine speed.

Cause

This condition may be caused by electrical noise on the OnStar® Vehicle Communication Interface Module (VCIM) battery feed wire being passed to the microphone output pins at the radio.

Correction

Technicians are to install a noise suppression filter P/N 1224205 into circuit 3240 the OnStar® battery voltage circuit a few centimeters (inches) from the VCIM. The filter package has three attached wires - a single yellow wire at one end with a yellow wire and a black wire at the other. Install the single yellow wire side into circuit 3240 towards the VCIM. Install the remaining single yellow wire into circuit 3240 toward the "INFO" fuse and the black wire to ground.

Important: The noise suppression filter is polarity sensitive. The filter is designed to be most effective when the end with the capacitor ground is connected towards the source of the electrical noise. Install the filter in this polarity first. If the noise level is still not satisfactory, try disconnecting the capacitor ground. In some cases if the first installation does not correct the noise, try reversing the filter polarity (removing the filter, turning it end for end and then reinstalling it) and grounding the capacitor lead.




Information supplied courtesy of Alldatapro.com

[bobyoung]

For those of you who think this sound system is a little light on bass, there is a subwoofer amp in the trunk just to the front of the battery with a gain (volume) control on it. It is set about halfway on from the factory, is a lttle halfway detent on it, I turned it all the way up today and what a difference! It like getting 100 more watts out of the system. Of course you don't but it changes the overall balance of the system so that it kicks ass and most of the power of a system is used for the really low stuff anyway. I like most kinds of stuff and everything sounded much better to me set like this. I asked my wife how she liked the new sound and she said the bass was going through her chest. To access it pull up the floor cover, take off the plastic molding on the back of the trunk that has the netting attached, you undo those four attachments, then pop the two divits holding the left panel on and the amp is right between the battery and the back wheel well with cables going in to it from the top, can't miss it. The volume control is in the middle on the bottom of the amp. I tried to find it by sticking my hand under the panel and couldn't find it that way as other's have. If you like bass, you'll be amazed at the difference. I was also able to change the back-front balance more towards the front going from R3 to R1 which also raised the overall volume.
I did this in a parking lot waiting for my wife to spend all her money, took about 15 minutes tops.

[GRRRR8]

I still need to do this whenever I get tired of listening to tire chirps!

[99-LS1-SS]

I still need to do this whenever I get tired of listening to tire chirps!

23 year of driving and I still love that sound!!

[GRRRR8]

I caught one this morning and it turned the car slightly sideways! My favorite way to get awake in the morning. Yes, even more then that, because that makes me want to go back to sleep! LOL

[99-LS1-SS]

I hear ya. The back tires on my Camaro made it a whopping 1500 miles from brand new to bald as a babies ass! I think my right foot is disproportionately heavy...

[jnak]

I get the whine even if I'm not using Onstar.

[-Ray-]

That's why my wife isn't in the car with me. LOL

[Mav]

lol

[GRRRR8]

That's why my wife isn't in the car with me. LOL

Hmmmm. I wonder what Karen would think about that comment. Send check too........LMAO!