Delco CD player

nfored · 09-20-1999, 11:10 AM

I have a new Monte Carlo and I'm trying to attach my MP3 player to it, unfortunately it does not have jacks directly on the back of the radio. However this radio does have a 9 pin connector for the 10 disc changer that you can buy as an option, and a button on the front of the radio called AUX. I've trying getting specs on this radio from various Delco related sources, and as you can guess I have gotten almost no information. I'm wondering if I should give up home and stick with my crummy FM transmitter, or if I should suck it up and buy a new stereo (losing my steering wheel controls). < help! > =)

Catlas · 09-20-1999, 05:39 PM

This may or may not help but I believe that GM uses Alpine cd changers in there vehicles.(or at least thats what i was told when mymom was shopping for one for her Monte Carlo) btw..just wondering but what year and color is it?

jasmar · 09-20-1999, 09:40 PM

Most of the factory gm changers are actually made by Delco which is a division of GM. However Alpine produces an interface to allow connection of an m-bus changer(6 disc) to the factory deck. Delco actually made Rockford Fosgates decks and changers up until the 99 lineup so that is why a lot of Gm's could utilize a Rockford changer directly. Now an overseas company is making Rockfords source units. As far as connecting through the changer inputs on the radio; Is your in dash a cd player or cass? It seems to me that is should be a little easier on the Delco units because not only is this port used for a changer but it is also used for the single in dash cd in the trucks and other cars and for the in dash cass in the monte carlos and I believe a few other cars. If you have a radio w cd or w cass and then a slave unit mounted elsewhere in the dash either cd or cass it would just be a matter of interrupting the signal from the aux player but if not you would somehow have to make the head unit think that it is talking to the aux slave. jas

Catlas · 09-20-1999, 10:14 PM

The Monte carlos d9ont have an auxillary slave. At least not the one's that Ive seen. THe heads that ive seen are full din 1/2 with the cass or cd built in.

nfored · 09-21-1999, 07:52 AM

The player is CD/radio, no cassette. I've looked at the 9pin connector. I've managed to find some documentation... maybe it was more than nine pins, anyway... there was a L in and a R in and a ground in or something along those lines, so I rigged up an external portable CD player as a source and connected the appropriate lines. At that point I was unable to get the deck to switch to AUX. I have no idea why, but I imagine that there is some sort of control signal telling the deck when the "external CD changer" is installed. Does anyone have a clue how to reproduce this type of "changer connected" signal? The picture of the deck is here http://www.delphiauto.com/images/Chev_UNO.jpg if you want to take a look at it. As far as I know this is also the same unit that is used in the Corvette (at least it looked that way). Thanks for all the great help already, and my Monte is a black Z34, leather seats and a whole in the roof. =)

nfored · 09-21-1999, 08:20 AM

I was just looking up some information on M-bus, are you sure that's what this kind of radio uses? There is sooo much information on M-bus, any suggestions on building just enough circuitry to feed my audio in? I'm reading through the documentation at www.m-bus.com, but that's a little technical for me. Thanks for all your help so far. =)

muel · 09-21-1999, 11:49 AM

I may be getting off topic, but I'd bet $100 that Alpine actually makes the changers, then ships them to Delco, who then put their name on it.

nfored · 07-03-2002, 04:02 PM

This isn't exactly what I was looking for, but its a start.

Stock GM interface

vintagecardoc · 01-10-2007, 03:26 PM

The way the slave units used to work in GM trucks, was (for example a cassette) was when you pushed a tape into the remote tape deck, it sent about a 4 volt (constant) to the cpu/amp along with L,R & what they called lo ground ( for the audio system only) hi ground was the chassis (battery ground). The 4 volts muted the radio and inserted the tape preamp signal. Giving the cpu/amp a 4 volt feed, you could substitute any preamp signal to the system, or add a switch for several different units. The terminals in the early-mid 90s were stamped by number on the cpu/amp housing. Best of luck.