Ok, I bet everyone that wants to replace their Bose headunit with an aftermarket headunit can't find the info. So I'll try to help from all the stuff I found.
Here's a site shows how to remove the headunit, speakers, CDM, and antenna. http://www.carstereohelp.com/strcadillac.htm

Here's the one for the wiring harness for Bose systems. http://www.installer.com/wires/

I'm attaching 2 pictures which makes one diagram.

If you don't get the wiring harness to by pass the bose system and the amps, you'll have to rewire the whole system. Meaning new headunit and new speakers all around.
I didn't use the by pass harness. I used the Battery, Ignition, and Ground for the CDM(reciever in the trunk) then wired them to 3 wires going to the orginal Bose headunit. I hooked those 3 wires up and the new aftermarket headunit worked. (It came on, worked, and retained memory of settings on the headunit after the car was turned off.)

Diagram is for a 1995 Seville.

Hope this helps everyone, if not someone.

(This should be a Sticky or FAQ)

ORIGINAL: robotic_junky

Ok, I bet everyone that wants to replace their Bose headunit with an aftermarket headunit can't find the info. So I'll try to help from all the stuff I found.
Here's a site shows how to remove the headunit, speakers, CDM, and antenna. http://www.carstereohelp.com/strcadillac.htm

Here's the one for the wiring harness for Bose systems. http://www.installer.com/wires/

I'm attaching 2 pictures which makes one diagram.

If you don't get the wiring harness to by pass the bose system and the amps, you'll have to rewire the whole system. Meaning new headunit and new speakers all around.
I didn't use the by pass harness. I used the Battery, Ignition, and Ground for the CDM(reciever in the trunk) then wired them to 3 wires going to the orginal Bose headunit. I hooked those 3 wires up and the new aftermarket headunit worked. (It came on, worked, and retained memory of settings on the headunit after the car was turned off.)

Diagram is for a 1995 Seville.

Hope this helps everyone, if not someone.

(This should be a Sticky or FAQ)



It already is ...

http://www.cadillacforum.com/m_14902/tm.htm

but will FAQ this thread also since we didnt have the BYPASS Harness.

thanks

http://www.installer.com/photos/70-1857.jpg
http://www.installer.com/photos/70-1856.jpg
http://www.installer.com/item/display_item.php?it=70-1857

When I posted this I was trying to aim at most Cadillac models, not just the Allante. The thread you post is for Allante and wouldn't help me at all in my case, 1992 Seville STS. (That's why it's in the Allante forum.) That's what the first link was trying to do, plus do headunit too.

Good point. Now being a FAQ many others should benefit.
thanks

Is the 96 Sedan DeVille similar enough to the 95 to use it's by pass?

I am doing some work on a 1992 sedan deville and i am changing the radio to an aftermarket one. The car has the bose system can i just get the harness adapter and plug and connect wires to the aftermarket? or do i need that second pack? If I need the seccond one I am confused on hook up because I dont have or know where those AV cable lookin plugs go in.

PLEASE HELP!!