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Discussion Starter #1
I inherited a Delco U1C AM-FM-CD from my son's 2001 Cavalier and have installed it in my '92 Caprice wagon. This was an incredible amount of work, but that's another story. It will not unlock, and I have been told that this unit communicates with the computer (which was a generation or 2 newer than the one in my wagon). Please tell me what I have to do to get it to operate in my car. The wire from position A-1 coming from the plug in the back of the unit evidently goes to the computer. It is marked "serial data A" in the info that came with the plug (made by Metra). How can I speak to this to get it to turn on? I know the VIN of the vehicle it came out of, and have been told that it uses a portion of the VIN in the original vehicle to "know that it hasn't been stolen".
There's GOTTA be a way..... I have invested WAY too much time & effort wiring and physically installing the thing to give up now.
Thanks for all input!!
Rindy
 
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Discussion Starter #2
Short answer : it won't work.

Longer answer : GM ties in the newer radios to the PCM (Powertrain Control Module). This results in the radio not working unless it can see the PCM. It also, in some cases, results in a car that will NOT run unless it sees the radio!

In other words, sell it and use the $$$ towards a radio that does work. Probably would have been better to ask this question before diving in :(
 
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AutocroSSer;
Thanks, I think! Is there no way to artificially generate an acceptable signal to the computer lead to the radio? Do none of the aftermarket electronic companies market any kind of "unlock module" to get one of these units to turn on? It just seems incredible to me that there would be no way at all to get it to work!
My next question; in electronic terms, what does the signal the radio receives from the computer look like?
Thanks again,
Rindy

'92 LO5 Caprice wagon 261k
'96 DCM Impala SS (wife's dar)
 
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The signal would be a serial bus signal. And no, there is no aftermarket module I know of to generate it. Putting OEM stereos into other cars is, unfortunately, not a big market for aftermarket companies.

Now if you want to put an AFTERMARKET stereo into a car that came with one of these (one of the ones that the car needs the stereo to function properly), there are modules out there to do it....
 
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Uh oh, does this mean I can't install the CD player from my '96 into my '93? I haven't gotten around to trying it yet.. maybe procrastination paid off again?
 
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Discussion Starter #6
Your 96 CD player will work fine. GM didn't start this crap until the 2000-2001 time frame....
 
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Originally posted by AutocroSSer:
Your 96 CD player will work fine. GM didn't start this crap until the 2000-2001 time frame....
While we're on the topic... it sounds like a factory cd player from a 2000 GM product won't work in my '96, right?
 
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Discussion Starter #9
Depends on the product/vehicle in question. GM started this on certain cars, as to not screw up the entire lineup in case they had problems.
 
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OK - I have one more question on this topic. Rather than my first approach of trying to come up with a 'black box' to artificially generate a signal to unlock the unit, how about this: If I could come up with a schematic for the radio in question, why couldn't I just open it up and bypass the theftlock internally? The computer signal wouldn't then be needed, it would just operate like any pre-theftlock unit. I am ready to try this if I can come up with a schematic for a Delco U1C radio.
Any reason this wouldn't work? Any idea where I could get the wiring diagram?
Thanks one more time!
Rindy
 
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Discussion Starter #11
I don't think the theftlock has anything to do w/ the PCM signal.
 
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