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onstar very loud with amp

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doug6 posted on Wed, Nov 4 2009 8:20 AM

I have a chevrolet silverado pickup and when i wired in the amp the radio sounded fine but when i when to use onstar it was loud enough to be heard for 3 city blocks. what did i do wrong, do i need some kind of interface?  any help is appreciated...... my radio and speakers are all stock.....

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Answered (Verified) TigerHeli replied on Wed, Nov 4 2009 9:03 AM
Verified by Alex W

Yep, the new GM's with OnStar are a pain.

There is a GMOS interface (runs about $130 or 50% off with a $130 or more head unit from CF) that you are supposed to use for this.

Related thread here.

Basically, your options are:

  • Replace factory head unit and add GMOS interface.
  • Keep factory head unit and add RF 3Sixty or JL CleanSweep.
  • Add GMOS interface, but modify wiring and add external speaker just for OnStar.

Hope This Helps!!!

Anyone else have suggestions?

2002 Ford Focus Sony CDX-GT410u Sony XT-100HD HD Tuner Stock speakers, no amp, no subs

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