anti-theft radio lockout

I have a 1990 Toyota Supra that was purchased new by my brother who lived in CA. Upon his death, I brought the car to Balto and garaged it
for six years. My husband set it up with a tickle charger but the battery still went dead several times.
Each time the battery dies, the radio becomes "locked". Since I did not have the code, I purchased one online. The directions stated that I had only about (5) tries before I would hit a complete "meltdown." During my attempts to activate the radio (each failed due to my incompetance), I finally exceeded the number of "allowable" attempts and I become truly "locked out". Apparently this was the forwarned "meltdown" and the radio went totally dead. (This is explained in the manual that came with the car.)
I have taken the car to (3) Toyota dealers and have been told that the radio was not getting power; it IS; that the speakers need to be replaced (they DON'T).
I do KNOW that most of the local service techs are not familiar with anti-lock radio systems of this type. It's like talking to them about an 8 Track Player. (before your time!).
Has anyone ever had this problem (besides a car thief?)
Would appreciate any input! I would like to keep the original equipment and I would also like to listen to the radio!!
Many thanks, Lois Calzone Frederick, MD
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The radio has inputs for power. 1 is for the radio itself to work and 1 is to maintain the radio presets and for the anti-theft feature. It is possible for the radio to work and still not have the part of the radio that maintains power for the anti-theft feature to work.
If 3 different Toyota dealers independently came up with the same diagnosis, I'd suspect that the diagnosis is correct.
There is a place called United Audio in New York that can repair the radio if the problem is with the radio and not with the power feed.
--
Ray O
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Here's a link the a wiring diagram - http://www.installdr.com/Harnesses/Toyota-Wiring.pdf With a volt meter or a bulb and some wire you should be able to check the two feeds (constant for memory) and switched for radio. Did you check the fuses? Does the cigarette lighter work? Did you see the SEC warning on the lighted radio panel? Is the amplifier ok (all the antitheft ones I've seen have the amp)? Note wiring at link is to the amp if there is one.

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