96 Deville factory stereo wiring
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Cadillac Audio, Video and Security Systems Discussion, 96 Deville factory stereo wiring in Item Specific Cadillac Discussion; I put an aftermarket DVD HU in today with a wiring harness from Walmart and I only hear sound from ...
  1. #1
    bobfawcett is offline Cadillac Owners Member
    Automobile(s): 96 Cadillac Deville
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    96 Deville factory stereo wiring

    I put an aftermarket DVD HU in today with a wiring harness from Walmart and I only hear sound from the left front speaker.Does anyone know the color coding for the factory harness so I can try to get the rest of the speakers working.Also I lost my warning chimes when the factory stereo was pulled.Everything else seems to work fine.The stereo I put in has an output for the center speaker so i am hoping to connect that also.I had to find my own accessory wire but that all went fine.I have the non BOSE system and it was a factory tape deck.I bought a Bosch install kit and modified it to fit my double din stereo and it looks great.If any one can shed some light on this I would really appreciate it.You guys really seem to know your stuff so I decided to join and ask for help.Do I need to buy a special wiring harness for my car to make everything work properly?I'm pretty good with wiring but I don't want to chance frying the digital dash if I can find an easier way.If not I have a very nice parts car that I got when I bought this Caddy.Please Help.Thanks,Bob.

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    CadillacSTS42005's Avatar
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    Re: 96 Deville factory stereo wiring

    search around youll learn alot more than i can say within one thread
    youll lose your chimes and alot more as you dont have the right interface you need a gmos-03
    and even with that the 96-99 Deville is notorious for MANY issues unless the factory radio remains in the car SOMEWHERE

  4. #3
    bobfawcett is offline Cadillac Owners Member
    Automobile(s): 96 Cadillac Deville
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    Re: 96 Deville factory stereo wiring

    Is this the only thing available to make my system work properly?It is quite expensive but if it is what I need I will get it.Is there a harness that will allow my factory HU to remain in the trunk?

  5. #4
    bobfawcett is offline Cadillac Owners Member
    Automobile(s): 96 Cadillac Deville
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    Re: 96 Deville factory stereo wiring

    Quote Originally Posted by CadillacSTS2003 View Post
    search around youll learn alot more than i can say within one thread
    youll lose your chimes and alot more as you dont have the right interface you need a gmos-03
    and even with that the 96-99 Deville is notorious for MANY issues unless the factory radio remains in the car SOMEWHERE
    Are you sure the GMOS-03 is the proper interface for me?I don't think I have a factory amp and I don't have onstar either.Not sure about the amp because the factory system did sound very good.Wouldn't know were to find it if there is one.There is a mess of stuff mouted to the back of the rear seat including the fuse panel I think.This is obviously my first Caddy and I don't want to screw up anything.I don't want to buy this interface if it may not work for me since I found there are so many different ones and apparently the 96 Devilles are oddballs.

  6. #5
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    Re: 96 Deville factory stereo wiring

    sorry it was caused gmos-03 its renamed gmrc-03
    either way yea you need it it maintains the data class system in the car
    and even with it youll still need to t harness the car and connect the factory hu in the trunk
    do a search without doing that youll have more trouble than its worth

  7. #6
    bobfawcett is offline Cadillac Owners Member
    Automobile(s): 96 Cadillac Deville
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    Re: 96 Deville factory stereo wiring

    So you think I'll need the GMRC-03 and an additional harness too?If so do you know what or how I can find out what that harness is?

  8. #7
    CadillacSTS42005's Avatar
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    Re: 96 Deville factory stereo wiring

    if you T harness it then you prob wont need the rc-03
    if you dont youll need the rc-03 and youll still have some issues
    the hu has to stay plugged into the car period

  9. #8
    bobfawcett is offline Cadillac Owners Member
    Automobile(s): 96 Cadillac Deville
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    Re: 96 Deville factory stereo wiring

    Yeah I have been reading about all the issues people are having with that interface so I'm going to find a differant way.My 96 Bonneville had a harness that bypassed the HU with a harness that ran from the trunk to the new HU.I can't seem to find a kit like that for my Caddy although that seems to be what I need.I really don't have time to make a custom harness so does this harness exist somewhere?

  10. #9
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    Re: 96 Deville factory stereo wiring

    that would be a T harness.....

    and no most people buy the 24 pin version and hack off the plugs get a 32 pin male and female plug and mate it to the wires

  11. #10
    bobfawcett is offline Cadillac Owners Member
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    Re: 96 Deville factory stereo wiring

    There is no easier way? What exactly is a T harness?

  12. #11
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    Re: 96 Deville factory stereo wiring

    its a harness
    that relocates the stock unit into another location
    and gives you the power and speaker wires you need
    exactly what you had on your Bonni

  13. #12
    bobfawcett is offline Cadillac Owners Member
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    Re: 96 Deville factory stereo wiring

    It has to be a custom made harness though right?If so has anyone documented how it's done?Hopefully with photo's.This is starting to be more of a hassle than it's worth.I went out and spent alot of money on the HU amp and sub only to hear bass and sound out of the front left speaker.There has to be a better way!!

  14. #13
    bobfawcett is offline Cadillac Owners Member
    Automobile(s): 96 Cadillac Deville
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    Re: 96 Deville factory stereo wiring

    Quote Originally Posted by CadillacSTS2003 View Post
    its a harness
    that relocates the stock unit into another location
    and gives you the power and speaker wires you need
    exactly what you had on your Bonni
    Hey I just found out through another post you live in western Pa.I live in easter Pa.It's good to know not everyone is in Ca.

  15. #14
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    Re: 96 Deville factory stereo wiring

    1 Yea custom made
    2 Someone was working on it im not 100% try searching it should be under a thread that gmrc-03 doesnt work
    3 Yup im a western PA boy, if you were local i could help you with it

  16. #15
    bobfawcett is offline Cadillac Owners Member
    Automobile(s): 96 Cadillac Deville
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    Re: 96 Deville factory stereo wiring

    Gonna try that thread.I was looking at it earlier but thought it was going to be to complicated to deal with right now but I'm going to take a second look.Thanks for your help.If I can't get this figured out soon I may be taking a trip to western PA!!!lol!!

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