99 STS Audio Upgrade w/ Pics
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Cadillac Audio, Video and Security Systems Discussion, 99 STS Audio Upgrade w/ Pics in Item Specific Cadillac Discussion; I decided to replace the Bose system in my 99 STS after all the speakers began to crap out one ...
  1. #1
    dvo816's Avatar
    dvo816 is offline Cadillac Owners Fanatic
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    99 STS Audio Upgrade w/ Pics

    I decided to replace the Bose system in my 99 STS after all the speakers began to crap out one by one. Thus began the long research process of what would be needed and how to go about installing everything. Ive heard many horror stories of audio upgrades in these cars with Bose, so I was very skeptical at first. Finally I said 'Screw it, let's go for it.' I originally saw Cadi509's thread about his install, and it gave me motivation as well as a bit of a guide. So a big thanks to Cadi509.

    I started off by buying the door speakers and HU:
    Pioneer AVH-P4300DVD


    Kicker KS65 speakers for front and rear doors:


    I already have the sub woofers and amp that I had in my Jeep. No pics of the subs, they're buried in the basement right now. However I bought KnuKonceptz RCA's, 0g wire plus 300A weatherproof fuse for the big 3 upgrade, and the Metra 95-2005B dash kit:


    I bought 100 sq.ft. of Fat Mat Rattle Trap and I used about half on the trunk area alone. The rear seat area will be done soon.
    Entire trunk including trunk lid and rear shelf done:





    I removed the flimsy plastic 'divider'/RIM holder and made a couple custom brackets to keep the RIM in the correct upright position. Some Fatmat in strategic places will keep it from rattling, but the sides are left alone because there are vents that allow proper airflow.


    I still have to mount the other module that was mounted to the plastic divider, but I'm waiting to see how everything else fits before making a permanent bracket.

    Just recently I bought the last of the things on my list; Axxess ASWC-1 (to retain steering wheel controls) and Axxess GMOS-06 (Even though Metra claims it wont work for 98 and 99 Sevilles.. I believe I can make it work). I started wiring up the GMOS-06 to the HU harness but I'm coming across a few problems that I need to address. I have a friend who use to be an electrical specialist for GM/Cadillac, so I'll be speaking with him tonight. MORE UPDATES/PICS TO COME!!

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  3. #2
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
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    You keeping the Bose amps? The kickers won't work with them...

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    dvo816's Avatar
    dvo816 is offline Cadillac Owners Fanatic
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    Re: 99 STS Audio Upgrade w/ Pics

    No. The amp will still be hooked up but Im running new wires to each speaker from the HU.

    I got a few answers for the wiring harness, so Ill be working on it more tomorrow. Heres what I have so far:

  5. #4
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
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    The amps are 2ohm, so hooking up 4ohm speakers to them won't really work..ask me how i know..

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    dvo816's Avatar
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    Re: 99 STS Audio Upgrade w/ Pics

    Lol now im curious.

    Im only keeping the amp in place for now to keep chimes (if it even works). I may end up removing the amp all together and connecting the data lines, but Im not messing with that for awhile.

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    txtaz is offline Cadillac Owners Fanatic
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    Re: 99 STS Audio Upgrade w/ Pics

    Ahhh the GMOS-06. Have fun.
    You might want to read '02 ETC Going Big Post 14
    I posted some other details elsewhare also.
    Taz

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    dvo816's Avatar
    dvo816 is offline Cadillac Owners Fanatic
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    Re: 99 STS Audio Upgrade w/ Pics

    I saw your install as well. Very nicely done! Glad someone else has the appreciation for attention to detail. I haven't had the chance to play with the GMOS yet, so we'll see how it works. Anyways, update time:

    Got all my wiring figured out for now. Since Im running new speakers and completely bypassing the amp, Im running new speaker wire directly to the HU. I'll end up losing chimes, but Im not too worried about it. Like I said before, Im using the GMOS to simply keep everything else functioning properly. *Not to mention it made the ASWC-1 install VERY easy!


    And heres the old AUX input I had N*Caddy make for me quite some time ago! If anyone would like to have it, shoot me a PM.


    Got the old stereo and climate controls out, then encountered problems..


    I started getting everything ready for the HU install with the dash kit. And the instructions were wrong for my particular model, so I ended up cutting the wrong tabs! I was so pissed, I called Metra tech support and voice my disappointment. Now I have to wait a week for the new dash kit, as well as send the morons at Metra an email with pictures showing that their instructions are wrong!
    While waiting for the new dash kit, I began taking off the door panels and running new wires.


    I got to thinking about how Im going to mount the new speakers in the front doors, and I got my plan. The hole in the door is way too big to mount a 6.5" speaker and the speaker needs to be spaced outwards to keep from hitting the window glass. So I ordered a sheet of 1/2" HDPE and plan on making my own speaker brackets. Basically they'll look like a large donut.
    Should have everything by late next week so Ill have an update then.

  9. #8
    txtaz is offline Cadillac Owners Fanatic
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    Re: 99 STS Audio Upgrade w/ Pics

    Nice work. Let me know if you have questions on the GMOS.
    Are you planning on Dyno matting the doors as well?
    I did mine and that made a big difference in mid bass. Plus much quieter.
    Taz

  10. #9
    dvo816's Avatar
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    Re: 99 STS Audio Upgrade w/ Pics

    Thank you! I was going to dynamat the doors originally but I decided to leave them alone for now.

    I finished wiring the GMOS and HU. After the install, I noticed the volume kept cutting out; Turns out its the mute part. For some reason I connected those wires and I shouldnt have. So I have to take it all out tomorrow and re-do it.



    Ill have photos of it IN the car after all the hiccups are figured out.
    As for the speaker brackets, I had ordered a sheet of 1/2" HDPE (fancy name for high-density plastic). I cut a large ring out of it; 8 1/4" diameter and 5 1/2" inner diamter. And fastened to the door using the originals holes, as well as 4 extra self tapping screws.





    The rear door speakers fit PERFECTLY where the old Bose speaker use to be. No brackets needed! No pics cuz I figured it was simple enough..

    Im still running the wires for the rear speakers, its a little more tricky than the front since theres a harness connector IN the B pillar. I came up with an ingenious idea to run the wires without drilling any holes. More to follow as I get time, its finals week..fml

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    dvo816's Avatar
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    Re: 99 STS Audio Upgrade w/ Pics

    Finally got around to running the wires for the rear doors. I unhooked the connector inside the B pillar and noticed there were 4 open cavities on it. I heated up a pick and widened the holes to run my wires through and into the door panel. No drilling required! Its a shame no one will ever see all the quality that has went into this project, once all the panel are back in place.







    After everything was wired, I began putting all the panels back on. Since I removed the plastic divider to mount the 2 modules to the 'cross-member' behind the seat, I had to cut the divider in half roughly to keep the holes where the top trunk panel attaches to with push clips. No pics cuz I was in a hurry to put it back together. Basically I kept the 2 studs and trimmed off the rest. A self-tapping screw in the upper right corner keeps it from rattling (as well as some fatmat behind it).

    SO its all done for the most part. Still some Fatmat left to be installed under the rear seat; thatll be for another time. I threw in my 2 12" Kicker CVX's (in a vented box) with a Sundown Audio 1000w Class D amp. Everything sounds GREAT! Way better than stock! AND I still have chimes!! Even the guy at Metra said I would lose my chimes if I wired in new speakers directly to the HU....WRONG! The chimes come from the upper left speaker on the dash.
    *****The ONLY issue I'm having is a loud POP after a minute or so every time I turn off the car and open the door. Im not sure what would be causing this, but if I cant figure it out then Ill just remove the dash speakers and lose chimes for good. Other than that, I have no issues with the GMOS-06 whatsoever. The steering wheels also work perfectly with the ASWC, and it was easy to install with the GMOS since its already wired for it.

    ***Also I had an ugly gap between the HVAS and the dash kit; not to mention the dash kit was very flimsy. Sooo I made a spacer for between the HVAC box and the stereo (I believe it was 1 1/8", cant remember exactly), then used long zip-ties to secure it together.

    If anyone has any questions, Id be happy to answer them! Happy Cadillac-ing!!!

  12. #11
    txtaz is offline Cadillac Owners Fanatic
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    Re: 99 STS Audio Upgrade w/ Pics

    Very nice. I like a good clean install.
    The pop is probably from RAP. Do you have dedicated power and RAP (off GMOS) to ignition of the HU?
    Also, you might like the Catera/Deville (Metra 95-2004 )face plate better than this one. I do, but I had to do some cutting to get the depth.
    Taz

  13. #12
    dvo816's Avatar
    dvo816 is offline Cadillac Owners Fanatic
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    Re: 99 STS Audio Upgrade w/ Pics

    I installed the yellow 12v constant to the yellow wire on the gmos which is the 'memory wire' as they call it. And red to red for the ignition. Was I suppose to do it another way?

    I took some more pics of the finished install: (Sorry folks, Im a pic whore)




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