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Many radios have an anti theft feature where if power is interrupted like when a new battery is installed the radio will be locked and will not work without an unlock code.
The dealer can unlock it for you, and you might be able to find it on the web somewhere but i doubt it.
The idea was for you to set the code when you got the car using the instructions in the owners manual, however nobody ever does.
Thats why the second unit did not work either.

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15y ago

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