The Pioneer KEH-8050 radio when shipped new does not need a code it is the user that sets the 4 digit code 1-0 and DIR/Play enters the code you get 3 trys then Err is displayed no more codes can be accepted until left powered on for 3 hours then it will accept another 3 ... The only way to reset it is to replace the EEPROM soldiered in the unit it's 8 pin DIP with a part number PDG or PDH 011.
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