Here's what you should do:
* Check the radio's manual: Your owner's manual should have instructions on retrieving the radio's security code. It might involve a specific sequence of button presses or require contacting a Chevrolet dealership with your VIN.
* Look for a sticker with a code: Sometimes the security code is found on a sticker inside the glove compartment, the owner's manual, or even on the radio itself (though this is less common).
* Contact a Chevrolet dealership: If you can't find the code in your documentation, contact a local Chevrolet dealership. They can usually help you retrieve the code using your vehicle identification number (VIN). Be prepared to provide proof of ownership.
* Consider a professional: If you're uncomfortable dealing with the security code, a car audio specialist or a qualified mechanic can often help unlock the radio.
Other less likely possibilities (check these *after* trying the security code):
* Blown fuse: Check your car's fuse box for a blown fuse related to the radio. Consult your owner's manual to locate the fuse box and identify the correct fuse.
* Faulty radio: While less likely, the battery disconnect might have damaged the radio itself. This is less probable but possible if there was a power surge during the battery change.
Start with the security code. That's the most common reason for a radio not working after a battery change.
