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#214950 - 07/13/11 11:12 AM 2004 Grand Prix- Igntion noise thru speakers-static with motor off
Bigugly Offline
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Registered: 07/13/11
Posts: 6
Loc: Iowa
I have a 2004 Grand Prix with the Monsoon radio, Onstar and XM. I occasionally will hear ignition noise through the speakers, a wine that gets higher with RPM's. And when the car is shut off, even with the door open, I hear static thru the speakers. Anyone have any idea where the problem lies, and if it is something that can be fixed, or something that could cause serious problems?
Thanks in advance!


Edited by Bigugly (07/20/11 05:57 PM)
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#215067 - 07/18/11 11:09 AM Re: 2004 Grand Prix- Igntion noise thru speakers-static with motor off [Re: Bigugly]
Bigugly Offline
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Registered: 07/13/11
Posts: 6
Loc: Iowa
I was told by a GM tech that the noise has something to do with the amp for the Monsoon stereo, and there is not a fix for it according to GM tech bulletins. Noise comes and goes, just really do not like the ignition like whining noise while the car is running.


Edited by Bigugly (07/18/11 11:10 AM)
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#215111 - 07/20/11 01:52 PM Re: 2004 Grand Prix- Igntion noise thru speakers-static with motor off [Re: Bigugly]
HercMan(Rob) Offline
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Registered: 09/12/03
Posts: 14035
Loc: Fort Worth, Texas
Did you put unshielded plug wires on?
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#215116 - 07/20/11 05:10 PM Re: 2004 Grand Prix- Igntion noise thru speakers-static with motor off [Re: Bigugly]
Bigugly Offline
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Registered: 07/13/11
Posts: 6
Loc: Iowa
Wires are factory wires. Whining ignition noise is present until you shut the car off. After the car is turned off, with door opened so all accessory are also shut off, you can hear static or feedback through the speakers for a little while.
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#215118 - 07/20/11 09:28 PM Re: 2004 Grand Prix- Igntion noise thru speakers-static with motor off [Re: Bigugly]
jjcom Offline
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Registered: 08/12/06
Posts: 464
Loc: USA
The whining noise might be the alternator, if I'm reading this correctly. Try taking off the belt, start the car and see if it still does the whine.
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#215127 - 07/21/11 09:20 PM Re: 2004 Grand Prix- Igntion noise thru speakers-static with motor off [Re: Bigugly]
burkem_10 Offline
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Registered: 07/21/11
Posts: 3
You need to find the amplifier and check the wires. Ensure that they all have a good connection, especially the ground wire and the RCA cables.
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#215138 - 07/22/11 01:48 PM Re: 2004 Grand Prix- Igntion noise thru speakers-static with motor off [Re: Bigugly]
Bigugly Offline
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Registered: 07/13/11
Posts: 6
Loc: Iowa
Thanks for all suggestions. I'll check the amp ground and RCA cables out.
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#215218 - 07/26/11 09:10 AM Re: 2004 Grand Prix- Igntion noise thru speakers-static with motor off [Re: Bigugly]
Bigugly Offline
Junior Member
Registered: 07/13/11
Posts: 6
Loc: Iowa
Got a new set of wires coming from Rockauto. The noise comes and goes so I am not too sure the wires have anything to do with it, but they could stand to be replaced so we'll see what happens.
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#217487 - 03/15/12 02:11 PM Re: 2004 Grand Prix- Igntion noise thru speakers-static with motor off [Re: Bigugly]
84CitationX15 Offline
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Registered: 03/15/12
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I had this EXACT same problem. I disconnect the speaker that was having a vast majority of the static, only to have the static jump to the next speaker. I called by friend who is an electrical engineer, and he said the radio has a bad ground connection, so what is happening is the radio needs to send power to the ground, it can't through the primary ground (due to a bad connection) so it's sending it through the speakers. I took the radio out, disconnected the ground wires behind the radio in the dash (there are multiple components going to the same ground point), wire brushed the contact, stacked the wires differently and tightened the bolt down real good. I have had NO problem since then. I would be shocked if this doesn't work for you.
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