View Full Version : 1998 Deville Stereo Install Photos

08-09-09, 02:15 PM
Since my own thread got dugged up I figure I'll post some comments on my own experience. A few years ago I went through hell and back trying to install an aftermarket stereo in my 1998 Deville but I've got it figured out. Like what BigOLak said the main issue is the data bus, the two purple wires on the back of the factory needs to stay hooked up. I took pictures while I did this so here they are.

Here's the beginning...I relocated the factory radio under because the wire loom is long enough and at the time I wasn't sure if this is how I solve the sleep mode issue. Instead of tapping into my ignition wire I ran a separate 12v wire to a SPST switch to turn my headunit on and off, this way I can have my stereo on without the keys at all. It's kind of more convenient but just make sure to turn it off when you park the car. I also ran separate power/ground wires(the 8 gauge wire in the picture) for my headunit, that way I can tap more 12v stuff to it such as TVs, active crossovers, etc. without worrying about the factory wiring.



I used this as the power wire entry, because I didn't feel like putting a 1" hole in my firewall


I planned on having a massive stereo system so I used 0 gauge wire. The red 8 gauge is for the headunit. You'll have to remove the metal plate above the battery.


Later on I added a chassis ground to improve current flow


08-09-09, 02:25 PM
NOW TO THE IMPORTANT STUFF :want: This is the factory wiring harness, see those two purple wires? That's the databus line we're talking about. The green-to-red wire is the radio antenna trigger.


Later in the years I extended the wires and relocated the factory radio into the top right corner of my trunk. I went to a junk yard and got the guy to cut off a factory radio harness, I extended the two purple databus wires, the power/ground wire and two other wires that I can' remember(sorry). Put it face up so it doesn't get turned on again. I added some cotton padding so it doesn't bounce around.



08-09-09, 02:39 PM
Pull up on the stepper and it should just pop off, there are tons of room for big wires.


To anyone who may be concerned about side airbags, there are no electronics attached to the door cover besides the factory tweeter, which I replaced with JBL then later Pioneer Premier units. There's one screw behind the red/white bottom door light and one under the power window switches, use a plastic pryer to pry them out. Be careful because if you break the tabs it won't seat right anymore. The power doorlock just pops out and you can also loosen the triangle sideview mirror piece by pulling it lightly. All the wires to the switches are quick-disconnects. Pull the door up once you remove the screws. I have no problem fitting in 5 1/4" woofers from JBL and Pioneer Premier.


I also made some fiberglass pods for my rear passengers because to be honest the factory door location is terrible. I'm going to do the same for the front eventually.



08-09-09, 02:51 PM
As far as removing the rearseats, push the bottom part against the rear and you should be able to lift it off. They're hooked onto the bottom like many other cars.



Now to remove the top half there are four bolts...two on the bottom and two on the top but the top ones are on the opposite side so you'll have to crawl into the trunk to get to it. The bottom bolts also holds the seatbelts so remember to tighten them after you're done! The carpet cover behind the backseat are held together by four little plastic screws under the rear deck, you can just pull them off.




Once you loosen the top screws the fuse rack will be halfway dangling, so you might as well take that off while working on the wires.

08-09-09, 02:55 PM

08-09-09, 02:56 PM
The 3rd brake light cover can be removed by pulling it towards you.


To remove the top carpeted cover to gain access to the rear 6x9 holes, you'll have to pop off this little tiny plastic bolt...it was a real pain for some reason.


Hummmm found some factory paint spill :suspect:


Right now is a good time to add some dampening material too, I used an off-brand but to be honest Dynamat is a better product.




08-09-09, 03:01 PM
This is with the fuse rack back on.


The little box in the red circle is your remote lock receiver. It has a little metal tab on the opposite side as an antenna. You'll notice a better range for your remote lock if you extend this "antenna" with some thin 18~22 gauge wire, like a foot to left and right.


08-09-09, 03:09 PM
I've gone through a few different speaker/amplifier/subwoofer/headunit setups since I did the install but one thing for sure is I never have any problems with sleep mode after that, and being able to turn the stereo on without the keys has been more of a blessing than inconvenience. The stereo imaging in the backseat is amazing and all of my friends who listened to it said they want it.

Do feel free to ask me any questions concerning this model year of Devilles, no one needs to be put through all the wrong conclusions and growing white hairs that I had to deal with.

Also what's with the short editing time??? I can't even go back to correct some spelling :)

08-09-09, 09:37 PM
This thread should be a sticky. ;)

08-09-09, 10:00 PM
Right on, if people find my information useful then make it a stickie :thumbsup:

08-12-09, 04:00 PM
this looks GREAT. can you email this to me and/or contact me so that i can get some help with the install? :thepan:

i have a 1999 deville and i am going to put a system in it. need to make sure that i avoid the databus issue. please, please, PLEASE help me out!!! ive been reading that the wiring harness, the gmrc-03, is not the solution and before i remove my factory deck, i want to make sure that i dont have any problems with my system.

i am installing:

1 - clarion vz709 touchscreen deck
2 - boston accoustic 12" subs
2 - pioneer premiere 6x9's
2 - pioneer premiere 5.25's
1 - tv in each headrest
1 - viper 5901 car alarm
1 - mtx 4 channel amp for highs
1 - mtx mono block amp for subs
1 - capacitor
1 - gel cell battery to run system

10-24-09, 10:05 PM
did you have to extend the entire harness to the trunk or just the two data bus wires?? Thanks, Dan

11-04-09, 01:51 PM
did you have to extend the entire harness to the trunk or just the two data bus wires?? Thanks, Dan

i was wondering the same thing. however, i'm guessing that you're going to need some sort of power running to the original head unit.

another question regarding the very first photo. when you initially had just that setup with the original head unit sitting below the aftermarket, did the system work like you wanted it to? did you simply splice the speaker wires, etc, and run the original harness to the original head unit?

11-04-09, 02:04 PM
i have completed my install and will post pics if anyone wants/needs me to do so. i spoke to metra (maker of the wire harness) and they advised that if you run a constant 12v line to the system and a constant 12v power line to the alarm (databus 2) you will avoid this problem. my system has been in since august and no problems thus far.

11-04-09, 04:32 PM
i have completed my install and will post pics if anyone wants/needs me to do so. i spoke to metra (maker of the wire harness) and they advised that if you run a constant 12v line to the system and a constant 12v power line to the alarm (databus 2) you will avoid this problem. my system has been in since august and no problems thus far.

Post them up! I encourage everyone to post pics of their installs, preferably in one thread to keep it organized. Maybe a sticky with all the forum users system pics? I think it would be helpful to others thinking about doing their own installs.

11-08-09, 05:07 PM
nice well done i like the 5.25 speaker coponet relocation thinking of doing it in my deville.. so did you have to take the whole side panel out to cut ot the circles or was it the seats .

11-18-09, 07:40 PM
I just installed my new HU in my 1999 Deville yesterday. Thanks to this forum everything went well. The E6 and F6 data cables for the old HU I ran to the trunk and used the 12v power and ground that was used for the disc changer to supply power to it. I didn't use a harness just pulled the E6 and F6 pins out of the harness and hooked them up in the correct male pins on the old HU, which I have discretely hidden next to my spare tire. Would never guess it's there. So for the record, the only 4 wires that need to be ran to the old HU are 12v power, ground, E6, and F6. That's it, no sleep mode, no alarm problems. And for the retained accessory power (RAP) I spliced into the front passengers 12v window power. To figure out which wire to splice into pop up the panel on the door that has the window up/down switch and see what color the wire is. Then snap that piece back on and find that wire in bundle that is on the far right side of the passenger side (around the same place you would placing all your new wiring for that is routed to the trunk). Make sure that the color wire for the window up/down switch is the only one in the bundle. Splice it and run a new wire from there to your new HU. Now you should have the RAP 10 minute or until a door is open feature.

11-25-09, 08:36 PM
This maybe a stupid question (never worked on a Cadillac) but is the amplifier built into the head unit or is it a separate unit? A friend of mine has a 1996 Deville and the stereo is not working right. It only has a small amount of sound coming from one speaker and when he took it somewhere thinking it was the head unit, they said he has a separate amplifier in there. If there is a separate amplifier then were is it located in the car?

11-29-09, 04:51 PM
That depends on the factory audio installed package: Bose uses a head unit with multiple frequency outputs to drive multiple amplifiers at or near each extremely low impedance speaker.

Your friends car may have a Delco unit which drives multiple amplifiers with tone control/basic equalizer control.

07-14-10, 04:07 PM
I have a 98 and a 94 Deville, i recently decided to take my Kenwood KVT 514 out of the 94 and install it in the 98. The problem that I ran into is that my deck would have power, able to receive and eject discs, but the screen wont deploy. While examining the wire harness, I noticed that the accessory wire in my radio wiring harness does not plug into anything in the harness attached to my car. What wire can I tap into to get power to my radio?

11-10-10, 03:47 PM
Hi there,
I am in the process of putting an aftermarket stereo into my 1998 cadillac deville. you said you had pics of how you were able to do this. Could you please post them? Did you have to relocate your factory stereo? I was just wondering which wires needed to be moved.


i have completed my install and will post pics if anyone wants/needs me to do so. i spoke to metra (maker of the wire harness) and they advised that if you run a constant 12v line to the system and a constant 12v power line to the alarm (databus 2) you will avoid this problem. my system has been in since august and no problems thus far.

11-19-10, 05:49 PM
dude make a youtube video or something !! i wanna see that in a action !!

11-23-10, 09:30 PM
SWEET INSTALL! Looks like you spent countless hours on it! I'm guessing it sounds sweet! But I almost went into cardiac arrest when I saw the electrical tape!

I couldn't believe you would go through so much work and effort and time and use electrical tape instead of some kind of secure connector. Not a good idea! I haven't used electrical tape since the 70's on any car audio or alarm installation. It's just not suggested and not a good idea.

Other than the electrical tape connections, nice job!

01-09-11, 05:34 PM
I did an aftermarket radio installation in my 99 deville, I relocated the factory radio to the trunk, and was able to catch the data wires at the amplifier behind my backseat. I am having a problem with my trunk button not working, everything else works. My car doesnt go into sleep mode, my alarm doesnt go off, my keyless works, I checked and double checked all my connections. Anyone have any idea?
thanks ahead of time for any suggestions.

Mike Johansen
01-17-11, 12:59 AM
This maybe a stupid question (never worked on a Cadillac) but is the amplifier built into the head unit or is it a separate unit? A friend of mine has a 1996 Deville and the stereo is not working right. It only has a small amount of sound coming from one speaker and when he took it somewhere thinking it was the head unit, they said he has a separate amplifier in there. If there is a separate amplifier then were is it located in the car?

Your amp is on the back of the rear seat. Open the trunk. undo the 4 screws for the carpet just under the window. remover the 4 10mm bolts from the fuse/amp rack. 2 on top corners and 2 staggered new bottom. pull rack down and the amp is in the middle. I am presently going through the nightmare of installing an aftermarket system in a 99. I will post pictures and a tutorial when i am done.

07-02-11, 04:53 AM
it all sounds good. i also have a 98 d'elegance that i want to install an after market HU in. I hooked up a line out converter to the 6X9 speaker leads in the rear deck, then the LOC to a kenwood 8105kc 1000 watt monoblock amp to power a dual 12'' sealed sub box with a sony xplod and a pioneer subs. I'm still using the stock HU and connected a 12 disc changer to the plug that was already in the trunk. It sounds pretty damn good right now but I hear that the sound quality is much better using an aftermarket HU than the route I went. I wish someone else would post some pics about more step by step directions how to do it. Especially about that databus cable business. The one dude said he forgot what other wires he ran to the trunk along with the databus wires. I also plan to upgrade to the big three next week and install an optima yellow top next month and even a HO alternator this summer and then a larger amp and subs but I need some more visual help. I want my shit to be really bumping! Any more links or pics out there??? I know I can do this, I just need a little, or a lot, more help. Thanks. Am I entering this thread too late?

07-02-11, 07:01 AM
Click on my user name on this site I have a site under car domain where I did the big 3 on two lacs. Just make sure you keep the wires free of where They can get mixed or caught onto anything and I recommendations a dual post . Those batteries makes installation easier. Make sure you use 4guage or better and fuse the wire that goes from your battery to alt

07-02-11, 11:48 PM
yea, that's some real nice work you puttin out. You got some skills. I'm not hating' I'm relating. I'm looking for some more pics of a '98 deville aftermarket head unit install. The only ones I found are good but I need a little more info about that databus cable and not being able to disconnect it and extending the stock HU back in the trunk. Sounds complicated and with all the electronics that caddies have, i don't want to mess anything up.

07-02-11, 11:54 PM
Dakid6945, Did you ever post your pics of your 98 caddie deville aftemarket stereo install? I wanna try it but I wanna make real sure about it all.

07-03-11, 12:00 AM
on your car what i would do is move the factory radio to the trunk as for aftermarket i would take into the fuse box for the power ground etc . as for the speaker wires i would run new ones. metro kits can be found on ebay.

08-24-11, 07:06 PM
hey everyone i need to know which color the RAP wire is on a 98 seville for the power window on the passengers side just wanna make sure im doin this right im doin the overhaul on the system its gonna take time but whatever already got the flip out jensen the subs and the door speakers i already hooked up the HU to make sure it worked its fine i made a harness to relocate my OEM and tested all the connections now just gotta find a nice spot in my trunk n im in but i also need to know what color this RAP wire is goin to the passenger front power window ill try to take some pics and post but u know how that is when ur in the middle of a nightmare

08-28-11, 08:05 AM
well ive figured it out the RAP wire on the passengers door is light green it also happens to be one of the speaker wires or something its kinda weird but i tested it and it gives power until u open the door IM IN now i have to wait for hurracane irene to pass and i can hook the friggin thing up thanks anyway guys ill try to post some pics

08-31-11, 07:11 PM
hey man, you clearly know a lot about this stuff, i was wondering if you could help me out, here is my thread:


11-21-11, 01:06 PM
So if you wanted to run aftermarket everything but still have your stock hu hooked up for the databus, how would you get your aftermarket hu to turn on and off with the car. Im relocating my stock radio in a 99 sls... All interior sound is aftermarket but i dont know how to get the hu hooked up like that... Someone plz give me some relocation advice!

12-28-11, 10:18 PM
I borrowed the 2 purple wires from the radio amp plug, then decided to take the same route as you. When I reattached the 2 purple wires, almost nothing works, not even headlights. What should I do?

02-28-12, 03:40 AM
Whats Up , Im new to the fourm , Can you please send me some pics on the aftermaket install , Id appreciate it very much .Im having the trouble on my '98 Deville D'elegance and its driving me insane .

06-17-12, 09:59 PM
hello i would like to know what my options are for using a amplifier a regular 760watts pioneer car amp that i bought at walmart and i understand there is a factory installed amp in a 1998 deville , so i would like to know how to make the pioneer amp work or increase the power of the factory amp or somehow use both and bridge them togather. i would really like to know what i can do with it

06-17-12, 10:04 PM
Can't the ohms are different. Your pioneer is 4ohk and Bose is one .its like apple and oranges. If you want to use the poineer you are going to have to bypass the Bose setup and rewire the system therefore you can't use the factoryHU

06-17-12, 10:17 PM
okay how do i bypass the bose setup, and i can still use the same speakers??? and how do i take out the factory HU ??

06-17-12, 10:20 PM
No you can't apples and oranges to bypass the Bose you have to run all new speaker wire to you new HU and depending if you want to use the steering wheel controls your going to need some modules to make that happen

06-17-12, 10:29 PM
well darn i really dont have money to buy all new speakers that are at 4 omhs and all new speaker wire... what gauge wire would you reccomend, sorry i know nothing about cadillac cars

06-17-12, 11:32 PM
Buy it all on eBay if you want the same size as factory wire I would go with 16guage

06-17-12, 11:33 PM
If your factory radio is Bose it will say Bose on it .also you will see the factory amp in the trunk

06-18-12, 11:02 AM
my factory amp and rear 6x9 speakers say DELCO ELECTRONICsS ?? and where would it say bose on it ??

06-18-12, 11:04 AM
It will say it on the factory radio .but if u have a factory amp you have Bose .non Bose doesn't have amps

06-18-12, 11:16 AM
okay i was confused because it said delco electronics, ok, so how do i Uninstall/ take out my factory HU

06-18-12, 11:21 AM
Well yours I believe the radio is wired into the antitheft so you have to relocate it in the trunk or add a series of modules to trick the car to think the factory HU is still in the car

06-18-12, 11:34 AM
okay so what professional shop should i go to i ont want to mess anything up

06-18-12, 11:37 AM
You could go to a professional shop and they could mess it up. If you can hook a stereo into a car you can do a Cadillac its just alil more complex .with this forum and others like the12volt.com you can achieve .I have to look the modules up on Crutchfield.com and then you will be good to go. The thing is your radio wires are dara wires so that's the issue

06-18-12, 07:51 PM
could i not just install my amp and only have the wires the RCA audio hoooked up and all the power and ground set up and only use my amp to power my subs ???

06-18-12, 08:08 PM
No because of the bose . The reason is the speakers are amplified already at different ohms from the afrermarket amp. So to my knowledge no you can't but for sh*** and giggles

06-20-12, 03:40 PM
what size speakers are those and how did you install them into that location ??? please answer

06-20-12, 07:15 PM
I believe the 98 has 5 1/4 speaker's in the doors but Crutchfield.com could verify if I'm right

07-05-12, 10:20 PM
I believe the 98 has 5 1/4 speaker's in the doors but Crutchfield.com could verify if I'm right

Yep, that is correct. 5 1/4" speakers in the front and 6x9s in the back deck. I don't like 6x9s tho so I made some fiberglass pods for the rear passengers.

08-05-12, 12:31 AM
hey man i juts noticed you live in stevens point. im up here in tomahawk. i hope u see this. is there any way that we could possibly get together to work on my 97 deville? it seem to me like you know what u doin. and how long did it take you to do all this?

08-18-12, 07:47 PM
Hey Guys, my 99 Deville tape deck has finally crapped out, i knew about this big ordeal about the after market head units which were not recommended in these cars to replace that's why i held on for 12 years until now...I had a Pioneer AVH-P2400bt HU installed..the shop said all i would need was a GMRC-3 harness, installation went sweet but now after the car is shut off for about an hour all my settings go back to default..Do i really need to install the factory HU in the trunk or can i switch the harness to a GMOS6 and just hook the right wires up for Sleep Mode and the Data- Bus to work properly...Just to let you all know, my stereo is not a BOSE..thanks

02-20-13, 02:40 PM
I have a 96 deville and want to install alpine iva-d310 I have the bypass tr-7 but I wanna know how I can hook it up without killing my battery or not having to reprogram all my settings everytime dont know if thats possible

98 caddydeville
08-25-14, 08:32 PM
I have a 98 deville and im tryin to relocate factory hu to the trunk tomorrow.does anyone know which wire from disc changer connection in trunk has power so i wont have to run to many wires from dash tryin not to work to long ,any suggestions appriciated

08-16-15, 10:15 AM
Mr meister 42. I come to you in desperation, I've installed countless stereos and other car parts throughout the years and this 98 Cadillac deville is something else. Confident it was like the others , you can only imagine the damage I caused. I finally recovered and fixed everything thing. It's been months and I can't continue using the cassette as aux. So Question: I don't have any money to buy new speakers. So can i install the after market stereo and use the stock bose amp and speakers? I will post pics maybe a video if you help. I think you guys will l like my set up.... I've coined it " the suspension stereo.
The stereo is a cheap boss 29 dollars stereo from frys. No CD . Just send card, aux , usb, and fm radio. Thanks

04-17-16, 09:01 PM
Well I know this post is Uber old but I am going to try it. I am going to leave my factory HU up front with me, might try to get it in the glovebox and use the Cigarette lighter for power and ground. We shall see.

04-17-16, 09:18 PM
It will never fit, they are bigger than they look. What exactly are you going ro power off the lighter circuit?

04-17-16, 09:28 PM
I will probably put in on the hump between the Driver and Passnger seat, maybe make a box for it. I am going to run the 2 data lines, ground, and power to the Factory Unit. Then install the new HU. Is the cigarette constant a bad idea?

04-17-16, 11:41 PM
Skip the box and having to look at it... Stuff it in the trunk above wheel on pass side. Power and ground for it can come from cd changer harness. Just have to run data wires to it.
Is your system a BASE or amp system? If amp you'll have to bypass it to use the speakers.

04-18-16, 05:54 AM
It's an amp. Not the Bose system. I will have to bypass the amp? That doesn't sound like fun. How do I do that?

04-18-16, 10:02 AM
Yes you will have to bypass the amp, it and the HU work as a team for sound so when one is removed the other is useless.
I'd have to look at wiring diagrams again to find out what wires need to be bypassed and where (speaker wires). All the wires for speakers come from the amp so you will have to either run speaker wires from new HU to amp area and connect or to each speaker from HU.
You need to read through this audio forum and deville forums looking for HU upgrades.
You will lose chimes and wheel controls also unless you purchase modules.
I took my entire amp system out of my 97 last year and installed new everything including amp and wiring to speakers. Taking the interior apart without destroying the trim is one of the harder parts.
Do your research or it will suck and not work right.

07-05-16, 06:45 PM
take out the factory radio and cut the connector out from the back of the radio leaving about two or three inches of wire coming from it. cap all wires except POWER,GROUND and 2 PURPLE data wires. Extend those power, ground, and data wires to about fifteen feet long and re-attach the connector.(cap the other wires on connector too). You have to be able to get the homemade harness all the way to the trunk and plug into radio. Relocate factory radio to trunk like rodnok said in that exact spot.( i had a storage door thing there so it was perfect!) i secured the radio into the frame of the car with metal plumbing straps. Completely hidden. NOW,,, u do an overlap install. Install Aftermarket HU running new wires for power gnd etc. got CONSTANT power from battery through a fuse direct. SWITCHED power, i put a jumper off that power from my battery to a switch under my dash. And GND from original radio wires inside dash. I did the "BIG 3" so i ran all new speaker wires from all doors to my amp in trunk. OVERLAP! sorry i never posted pics. I got rid of the car since then. It was a badass install though. Very clean install. i endeed up putting a flip out single din in it. Took me about three days total for the whole thing. after that u can install anything in anywhere. Good luck

07-05-16, 06:50 PM
found a pic of the hu installed ( my flip out got jacked so i put this in afterwards)400778

12-27-16, 02:23 PM
Damn! pics not found!! would have loved to see. I have a 97 deville , thought i would get some inspiration ! hate this factory cassette palyer!![COLOR="Silver"]