1992 Cadillac Seville/ Hade unit install

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=50114
Printed Date: May 17, 2024 at 9:45 AM

Topic: 1992 Cadillac Seville/ Hade unit install

Posted By: ka3vvv
Subject: 1992 Cadillac Seville/ Hade unit install
Date Posted: February 14, 2005 at 8:37 PM

Have any every installed a hade unit into a 1992 Cadillac Seville. It in the trunk of the car where you would get the speakers. In is there a factory amp for that car. What are some things I need to look out for with the install.

Replies:

Posted By: Asmodeus
Date Posted: February 14, 2005 at 8:52 PM

OK to start these cars are a pain....

Go to the trunk remove the cosmetic cover piece from the front of the trunk against the back seat so you can see the amp...The amp is on the right side of the trunk...Should be a silver box with heat sink fins on one side....

On the bottom of the amp there are 3 plugs...These are the plugs AFTER the amp where you will get your speaker connections...On TOP of the amp there are 2 Plugs...These go to the front of the car to the factory head unit Thats where you will get power for the aftermarket HU...

You will need this harness (Nevermind what it says about not fitting)....

On the bottom of the amp unplug the 3 harnesses...Plug in the 2 speaker harnesses into the aftermarket harness (They only fit one way so you will know which is which)...This is important The harness that goes to the power section of the aftermarket harness plug it back into the amp....do this so that the harness in the dash will be powered and grounded...OR....Make jumpers around the amp connecting the power to the top harness so the wires up front are hot...If you do this UNPLUG the 2 harnesses from the top of the amp also.

NOW...Get a Digital Multi-Meter and check the impedance of the factory speakers...I believe the factory speakers are 1 ohm...(the car I worked on already had the speakers replaced) IF the factory speakers are NOT 4 ohm or higher you will have to replace them before you hook your aftermarket deck to them..OR wire them in a series config to get the Impedance to at least 4 ohm, in doing this you will lose you Ballance/Fade so I would just replace them..... If they are 4 ohm and up connect some speaker wire to the aftermarket harness you bought and run them to the dash to connect to your HU...

Go to Autozone or Advanced Auto and get an FM antenna Extension Cable....Also get a GM ANTENNA ADAPTER...

The antenna is plugged into the amp as well.....Plug the Adapter into the stock Antenna in the trunk...Then plug the Extension cable onto that..Run the extension cable to the dash...Also you have to power the antenna so either run a wire from your aftermarket unit (remote turn on) to the relay on the antenna to activate it or get ACC power from the rear at the Amp harness that you plugged back into the amp on the bottom... (Antenna will extend when the car is on)...

On the dash harness use the multi meter and find 12+ GND and ACC....I think if I remember...The Yellow Wire on the factory harness is 12+....The brown wire next to the Yellow is GND....And there is a BROWN / Blue(???) on the other end of the same harness that is the ACC.....

Make all the proper connections and you are in business.....

After I did the one...My advise is Leave them be....I could not find an adapter so that I would not have to do all the above if you find one please post back to tell me...

I dont think I left anything out....

GOOD LUCK AND HAVE FUN!!!!

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Making the World A Louder Place

Posted By: tech460
Date Posted: February 15, 2005 at 10:28 AM

One, why don't you use the proper harness for the car? It's makes the job much easier and you don't have to do much extra work.

Second, on the Bose systems you cannot use that harness as the Bose systems are common ground front and common ground rear.

Third, that is not an amplifier where you are stating, that is a tuner box. The amp on the Bose systems are at each speaker and the amp for the Delco system is behind the back seat accessible from the front only.

ka3vvv, if you want to make the job easy, use Metra part number 70-1857 for the Bose systems and 70-1856 for all others. Those harness' both include an antenna extension and a 17' long harness to go from the rear of the car to the front. The Bose one has rca's instead of speaker wire and is pinned according to the common ground Bose input.

I hope this post does not sound harsh as emails and such are so inpersonal. I am just trying to educate and make this site even better.

Posted By: Asmodeus
Date Posted: February 15, 2005 at 10:43 AM

For starters the equipment I listed cost around 30 dollars....The harness you listed was 80.....

So what If I miss-labled it as an amp....

and what I listed above is not that hard...I just went step by step so that he wouldnt have any question....

And both ways do the same thing...So we are both right...My way is cheaper though...

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Making the World A Louder Place

Posted By: tech460
Date Posted: February 15, 2005 at 11:20 AM

I did not mean it to sound bad Asmodeus and that's why I put that last paragraph in. Yes your way is cheaper but that's not what kavvv was asking for. He was just asking how to do the install and we both gave him good ideas but I believe the way I gave him is easier from a DIY standpoint. Kavvv, the choice is yours. Also, if you have a Bose system your way will not work properly unless you repin the harness to reflect the common ground situation and put rca ends on. Bose is not floating ground. Please don't take this post wrong Asmodeus, wer'e both on the same team.

Posted By: ka3vvv
Date Posted: February 15, 2005 at 10:17 PM

Thank you guys for the advice on that. A friend of a friend would like for me to do the install it for him I don't know what to price it at. That seems like a lot of work. It seem like it will be well over $130. Sorry about the misspelled word. Head unit