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When you hook up the battery the CDR 23 radio will just turn on.
To be 100% technically correct there is a code in the radio and a matching code in the instrument cluster, but you cannot access them without a PST2/PIWIS and there is no reason to access them unless a radio or cluster is being replaced. I have been told this code is based on the last digits of the VIN. The older 210 and 220 radios had a code based on the radio serial number.
Just some worthless trivia.
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