Auxiliary input on a ’97 STS any suggestions?
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    N*Caddy's Avatar
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    Auxiliary input on a ’97 STS any suggestions?

    I have the standard sound system that come with the ’97 STS and, as you all know, it has no CD player and auxiliary input. Well the CD part can be solved with the trunk mounted CD changer but still the auxiliary input problem remains. The options I got are Cassette adapter (boo), FM transmitter (boo) or FM Modulator (again boo!).
    The only right way to do-it is to actually tap wires before the volume control (I did-it on simpler audio devices).
    First I got a stupid question, if I remove the car stereo and connect it back (assuming is in the same state) will still work (I mean no security codes and other funny stuffs). Why I am asking this: I found somewhere the stereo removal instructions but with the following note: “Do not disconnect the wires!” (no explanation).
    The second question: Has anybody done this or has the electronic diagram?

    Appreciate any suggestion otherwise I will have to stick with a FMM100.

    Thanks’

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    Re: Auxiliary input on a ’97 STS any suggestions?

    your car predated theft lock so youll have no issues unpluging it and pluging it back in so long as you clear the codes afterwards and before you ask how its been beaten to death do a search

    no one has done this and unless you have some way of AMPING the sound signal it will sound worse than an fm modulator connecting it to your speakers..

    if you have bose then your better off because the radio sends out a preamped signal which is amped by the 4 mini amps on each speaker, then you have to account for the fact how are you going to switch from one signal to another and block the non wanted sound source not to mention you need to find a way to remote power each of the 4 mini amps...

    in english it will be a hack job to say the least, just upgrade and put an aftermarket set up in...

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    N*Caddy's Avatar
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    Re: Auxiliary input on a ’97 STS any suggestions?

    Thanks’ CadillacETC1997 for the unexpectedly prompt answer…waw!

    4 words: NO AFTERMARKET FOR ME!
    So, I like the loooong and difficult solution. Maybe I was not clear enough, I am not planning to connect the signal to the speakers directly; I want to insert-it between the preamp and amp (before the volume control) because I want to have volume control from the HU.
    I know is difficult because is a digital control, on a analogic device the project is pretty straight forward, just tap it on the potentiometer and you are good to go.

    Is good to know that I have no security problem removing the HU (sometime is better to be less sophisticated) but on the other hand on a newer one you will not have this problem at all (the 98’s and up have the aux input in the glove compartment, dammit!).

    Anyway, thanks’ man I learned something very useful!

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    Re: Auxiliary input on a ’97 STS any suggestions?

    98 and up do not have and aux in...
    thats the 99-00 CDROM nav systems in sevilles and devilles that had that and Eldos NEVER had that....

    if your looking for a simple rca input then why not just buy the adapter that plugs into the 12 disc changer plug and gives you a left and right audio....

    there is NO way to run an between line source and control the volume via the hu
    you need it to go IN to the hu then OUT to the speaks in order for the hu to control the volume
    the hu does not act like a gain nob boosting the power of the amps, it acts more like a signal knob and boosts the sound signal volume before it goes to the amps...

    and why not aftermarket?
    its so much simpler and better sounding....

    heres a pic of my car when i had my alpine hu in and then with my pioneer avic-n1 navi systems the sound quality improved 100 fold over the stock bose crap..


    1st pic was with my gfs camera and 2nd with my cell phone so the quality kinda sucked

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    Re: Auxiliary input on a ’97 STS any suggestions?

    Aa, you asked how to remove the unwanted sound sources, is pretty easy, just use some switch female jack (just like the one in the picture). Sorry for the bad focus, I used my cell phone camera, but I think you got the idea.
    Attached Images

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    Re: Auxiliary input on a ’97 STS any suggestions?

    Nice, touch with the LCD!

    Ever since I bought the car I was thinking to go video, installing an actual computer (more likely an SBC) and a touch screen display to the car. I found one very nice idea on this forum (I said to myself “wow I am not the only one”). If I will find the time to start the “computer project” definitely I will write my own software (especially GPS, I have a lot of experience with this stuff). The drawbacks are: no more radio station display, the time required booting the computer, and I will still require an auxiliary input because I am keeping the HU board for the steer well controls and bell. Also I will loose the tape player (I know this are the 2000’s and I only use-it once in one year but still). Also, it will be extremely elaborated the software and electronics to control the radio (using the parallel port). Then again, you will have the DVD, the USB ports and GPS (Home made), mp3-s, rear view camera…

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    Re: Auxiliary input on a ’97 STS any suggestions?

    yup
    someone did a carputer in a CTS
    you prob wanna contact them and follow up with them on how to do that
    thats a whole nother realm from what i know lol

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    Re: Auxiliary input on a ’97 STS any suggestions?

    The RCA adapter connected to the CD Changer cable is excellent but it will eliminate the CD Changer option (not such a big deal considering that I don’t have one). Probably if I can not tap the wires this is the best solution.
    Know a compatible one and a place to buy-it?


    As for my idea, this is how I believe that the simplified - One wire block diagram of the standard HU should look like.
    All I have to do is find the “red” spot.
    Once again, a detailed HU schematic will really help a lot.
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    Re: Auxiliary input on a ’97 STS any suggestions?

    ebay has them all the time for like 100 bucks

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    Re: Auxiliary input on a ’97 STS any suggestions?

    I am

    So you want a input after the hu and before the speakers? Just the plug I assume? How would you switch between the input and the hu? I would be worried about the quality of the input and the hu after the wiring is done.

    I would say aftermarket but you were kinda clear on no...

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    Re: Auxiliary input on a ’97 STS any suggestions?

    Hi guys, I will try to be more specific…
    Ok, so one more time, I need to insert a line level audio signal inside the HU BEFORE the volume control. Usually the signal level in that area is compatible with the line level (exactly what you would get from an iPod for example). By “usually” I understand all the audio devices (radios, tape and CD players) I ever opened.
    I already posted above a diagram with how I believe the HU generic block diagram should lock like. The red spot in the diagram is the point where I am looking to connect my signal. The fact that the amplifiers are inside or outside the HU is just a minor detail; my signal will already be on line before the volume control (witch is upstream from the amplifier input). The sound quality is excellent (the best you can get) as long as the signal level is not to high (i.e. you don’t get signal from a high power amplifier). The signal switch part is the easiest thing in the whole project, like I said, just use a simple switch 3.5’’ female jack connector (check the “jack.jpg” diagram attached). The female jack is a simple mechanical device. When the male connector is off (1) the signal from “R in” and “L in” is directed towards “R out” and “L out”. Imagine that you insert this on the signal way (just before volume control) basically you would listen what ever is selected in the HU (radio, Tape or CD changer option). Inserting the male jack in (2) the signal from “R in” and “L in” is disconnected and the signal on “R out” and “L out” is the one coming from the male jack (i.e. your iPod).
    Now, in an analog volume control based device the task is simple, you just insert the female jack connector on the potentiometer wires (see "diagram2.jpg").
    In a digital volume control device, the connection points are not so obvious as in the analog version. A chip (usually having several other functions) does the actual volume control.
    As my HU has a digital volume control, the task is not so simple WITHOUT A SCHEMATIC.
    I would appreciate a schematic!

    Thanks
    Attached Images

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    Re: Auxiliary input on a ’97 STS any suggestions?

    I just bought from e-bay a HU (apparently fully functional) witch I am planing to use for training just in case I fry/break something while working on my auxiliary input project.
    Now I am ancient to receive-it (is on the way) so as soon as I have some results I will keep you inform.
    Probably if all goes well I will end up with two HUs with a unique feature (one for me and the other one I will e-bay-it)…

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    N*Caddy's Avatar
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    Re: Auxiliary input on a ’97 STS any suggestions?

    OK guys, my HU I bought from ebay arrived a few days ago, and turned out to be from a 98 Catera (not 97 Seville as I would expected). I know they are not compatible but I hope that most of the sh*t inside is the same. The amplifier is a TDA7384A (4 x 35W QUAD BRIDGE) pretty common and straightforward to use (I got the diagram). The outputs (pins 7-9, 5-3, 17-19 and 21-23 in the order of channels) are going directly to the back connector (I did not note the actual pins on the connector). The inputs (pins 11, 12, 15, 14 again in the channel order) seems to come (passing to a 0.1 microF capacitor each) from a chip (AND THIS IS WHERE I NEED HELP). This chip I suspect to be the one that switch between the radio, tape player and CD Changer. The problem is that I CAN NOT FIND THE feacking thing on the Internet.
    On the chip you can read:
    200945
    2PLA744
    Korea
    ST

    I did not heave enough time and tools to draw the schematic from the board (as my meter is somewhere between Hong Kong and Canada) but from a visual inspection the outputs from the tape player and radio board seems to head towards this chip.
    If someone out there has a diagram for this 200945 I would appreciate it.
    Thanks’
    And I keep you updated.

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    Re: Auxiliary input on a ’97 STS any suggestions?

    dude
    if you needed a 97 radio
    i have my old one from my 97 eldorado ill sell you its just missing 2 of the knobs i gave them to my mom for her 96 deville...

  16. #15
    N*Caddy's Avatar
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    Smile Auxiliary input on a ’97 STS, version 1 WORKING!

    Today we had a beautifully sunny day, so I worked on my auxiliary input project and IS WRKING! (The sound is perfect and all I used was 7 - 20 AWG wires and one 3.5'' jack female connector w/o 2 sw.)
    Now I have AUX input on my ’97 HU with no funny stuffs (like FM modulator/transmitter, cassette adapter or CD Changer-Aux. input)
    For the moment is just a temporary set up (the connector is sticking on the upper left corner of the ashtray - see the picture), I still have to decide where to locate it (suggestions anybody?).
    As you see in the schematics I inserted two NC switches before pins 7 and 13 sync. with the male connector insertion. This will mute the radio while the AUX signal is going to pins 17-18 (left) and 19-20 (right).
    So far I have no HU volume control (other that MUTE when volume at minimum and ON at any other position).
    I will have to use shielded cable between the AUX connector and the HU board (especially if I will locate it away and not on the front panel). Also I will try to relocate de AUX signal in such a way to take advantage of the HU volume control .
    FOR THAT I NEED TO HAVE THE ZPLA744 DATA SHEET (I can not find it anywhere ), if anybody has the diagram I will appreciate it (apparently is the same chip used in the ‘98 Catera HU’s).

    One more time I will appreciate the ZPLA744 Data Sheet.
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