How do I lock out my OEM radio?

Dec 4, 2008
OK so I had the radiator tank replaced and they had to pull the battery cables when they popped the tank off. When we put the cables back on the radio reads "SEC". Now I don't have the security code to program or the owners manual to know how. I DO have the master codes and so I need to know how to lock out the radio so it reads "HLP" to enter te master code.

How do I enter random codes so I can lock it up and then enter the master?

maybe I'll just buy an aftermarket at some point, but there was nothing wrong with stock for now.

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