H3 2007 replacing head unit problems

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H3 2007 replacing head unit problems

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H3 2007 replacing head unit problems - 8/18/2007 1:06:05 PM

haiminger

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Hello,
I've just finished replacing my H3 head unit (I believe it's monsoon because it's written above the sub in the cargo area). I do not have Onstar.

The new head Unit is actualy the Infill G4 car PC (includes a FM radio and 4x45W Amp).

I used the PAC C2R-GM24 after market harness to connect my G4 to the original harness car. The only modification I had to make to the PAC C2R-GM24 harness, is to cut the 4 RCA connectors and solder them directly to the 4 audio outputs from the Infill G4.
I now have two anoying problems:

1. There is a static noise in my speakers. The static is there even when the engine is off and the Infill G4 is in MUTE state.
The static noise is louder when ever the G4 (CarPC) access the hard disk, or the CPU is working harder.

2. I have to use very low level Audio setting in my Pc, Other wise the sound is way to loud.

I think I need the PAC SNI-35 to be installed between my G4 and the PAC C2R-GM24 harness. This should solve 2 problems (I hope):

1. Reduce the Audio output to pre-amp levels
2. using the built-in ground loop isolation in the PAC SNI-35, it sould eliminate the static noise.

Any good advice would be helpfull (I hope I'm not doing anything stupid). I have not orderd yet the PAC SNI-35, So please H E L P!. The static noise is realy realy anoying.

Again, Many thanks in advance for your help

Haim

< Message edited by haiminger -- 8/18/2007 1:10:56 PM >

Post #: 1

RE: H3 2007 replacing head unit problems - 8/18/2007 1:19:12 PM

Doc Olds

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From: Boat Town USA (Michigan 48045)
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I'm nuts.................and bolts. You need an electro whiz, HummerGuy help this dooood out. Man you guys even got the same lingo. I like this guy, NO ONSTAR!!!!!!!

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RE: H3 2007 replacing head unit problems - 8/18/2007 2:12:01 PM

importkiller

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well, as the resident car audio installer here I think I can help you. Rca connectors are a shielded cable to prevent static and help reduce alternator hiss also the rca's are a low pass input where as the regular speaker level inputs are a high pass...cutting the rcas and wiring them to a high pass input will give you lots of static and unlevel sound distortions. unfortunelty you will need to buy a new pac harness to replace the one you cut the rca's on, then you'll need to install an rca to line level adapter....pac makes one I think, so does scoche(sp) and phoenix gold....this is the only way to get your new head unit to correctly work with the monsoon system.

hope this helps

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RE: H3 2007 replacing head unit problems - 8/18/2007 2:13:58 PM

importkiller

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I just did some research and the pac harness you bought WILL NOT work with an h3...I will call my old distributor and see what will. Hopefully I can get in touch with him today for you.

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RE: H3 2007 replacing head unit problems - 8/18/2007 2:20:46 PM

Doc Olds

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Thanks IK.

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RE: H3 2007 replacing head unit problems - 8/18/2007 2:24:45 PM

importkiller

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did some looking around cause my distributor is out for the weekend.

seems to me you should be using the PAC C2R-GM24...it is what we have used on 2006 h3's and I haven't seen anything about changes made to the 2007's. But there are a few things you will NEED TO modify!!! Check out this bulletin about it:

http://www.pac-audio.com/bulletins/2006h3wiringchange.pdf

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RE: H3 2007 replacing head unit problems - 8/18/2007 2:26:53 PM

importkiller

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yup, that is the one you will need...here is a list of compatible vehicles:

Compatible Vehicles(with or without Bose®):
2000-2005 Cavalier, Sunfire, Impala, Monte Carlo
2002-2003 Malibu
2002-2005 Grand Am
2002-2007 Trail Blazer/Envoy(SLE), Montana, Venture, Rainier, Terraza, Uplander
2003-2004 S-10
2003-2006 Tahoe, Suburban, Yukon, Sierra, Silverado, Avalanche, Bravada
2004-2007 Grand Prix
2005-2007 Corvette, Canyon, Colorado, H3
**If Premuim Bose® is bypassed:
2002-2004 GMC Envoy(SLT), Chevy Trailblazer(SLT)
2003 Hummer H2
2003-2006 Cadillac Escalade, GMC Denali(Sierra/Yukon), SSR

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RE: H3 2007 replacing head unit problems - 8/18/2007 6:12:17 PM

haiminger

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To Importkiller,
Firts I Would very very much like to thank you for your help. So please let me know iF I understood you:

What I need to do is:

1. On the factory harness, Put the 3 purple wires together as shown in thes link:

http://www.pac-audio.com/bulletins/2006h3wiringchange.pdf

2. Can i Solder new RCA connectors to the PAC C2R-GM24, instead of buying a new connector ?

3 Buy the PAC SNI-35 (which looks like a rca to line level adapter)

And everything should work?

Again
Many thanks for your help

Haim

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Post #: 8

RE: H3 2007 replacing head unit problems - 8/18/2007 7:32:24 PM

importkiller

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your welcome....glad I could help you,

I guess that ,y replies were rather confusing..so here goes...throw your harness away....all you will need is the PAC C2R-GM24 that I mentioned one or replies above....that will be the only thing you need....it is a wiring harness and has the line levels you will need....either high or low...it should have both. Doesn't your new head unit have RCA out plugs on the back of it? I would assume so...nearly every aftermarket made today had rca jacks. If so then just wire rca's from back of radio to rca's in the PAC C2R-GM24...if not then use the line level wires.

The diagram in that link I sent you is a diagram for the PAC C2R-GM24....wire it exactly as it shows and you should be fine.

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RE: H3 2007 replacing head unit problems - 8/18/2007 9:25:35 PM

haiminger

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To importkiller
Sorry but the Infill G4 CarPC DOES NOT have RCA outputs. It has 4 High level outputs only, And I'm allready using the PAC C2R-GM24 (but I did not do the purple wires thing), and I have CUT the RCA heads and wired it directly to my G4 Audio Outputs

So I guess I'll need to buy the PAC SNI-35 (which looks like a rca to line level adapter) aftre all?

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RE: H3 2007 replacing head unit problems - 8/18/2007 10:04:27 PM

haiminger

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To ImportKiller:

Just to make sure - here is the way I used the C2R-GM24 harness:

www.pac-audio.com/instructions/c2r-gm24.pdf

I Used the first option of cutting the RCA plugs since my head unit Does not have low level audio out.

So ,
I think I need to use a 2 units of PAC SNI-35 (which looks like a rca to line level adapter) and attach 4 new RCA heads to the existing C2R-GM24 harness.

It sound like this will work or I'm just dreaming?

Many thanks again for your help
(Sorry, I don't know why the fonts in this message have turned into green)

Haim

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RE: H3 2007 replacing head unit problems - 8/19/2007 10:23:19 PM

importkiller

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sorry bro....don't know why I missed that you are using the right harness adapter after all....my bad. If you want to try a line level adapter try a scoshe(sp?) I don't know where you are located but they sell them in local wal-marts for like $25...if it doesn't fix your problem just bring it back for a refund

I would try to do the purple wire thing from that bulletin I sent you....that may be all you need to do.

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RE: H3 2007 replacing head unit problems - 8/19/2007 10:30:24 PM

importkiller

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ok, if you have the sub in the rear cargo area then you have the monsoon system....you will need to follow the bottom set of instructions in that link you posted...the set of instructions for bose systems, because you are still using the monsoon amp and sub. Thats the problem, you followed the non bose set of instructions that said to cut the rca's, the bose instructions say that you will need a LOC...or Line output Converter...as we talked about earlier. Just so you know, you will probably need to adjust the LOC's gain... so if you have static or hiss at first, don't give up...adjusting the gain is very important...as the instruction you posted say...you need to get 2-4 volts from your rca's...so just keep playing around with it.

< Message edited by importkiller -- 8/19/2007 10:34:27 PM >

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RE: H3 2007 replacing head unit problems - 8/20/2007 2:25:39 PM

jdrew

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I used Metra and it has been flawless (with monsoon and OnStar)

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RE: H3 2007 replacing head unit problems - 8/20/2007 6:51:01 PM

importkiller

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metra is good also...there are alot of different brands that are good. Shops have been argueing about what ones are better for years now...IMO they all get the job done.

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