For a factory-installed GM radio:
* The radio likely requires a security code. GM radios have anti-theft systems that lock the radio after disconnecting the battery or experiencing a power interruption. You'll need the radio's serial number (usually found on a sticker on the radio itself, once removed) to get the unlock code.
* Finding the Code: There are several ways to find the code:
* Dealer: Your local Chevrolet dealer is the most reliable source. They'll need the radio's serial number. Be prepared to prove ownership.
* Online Resources: Several websites claim to provide GM radio codes. Use caution with these and only use reputable sources, as some may be scams. You'll likely still need the serial number.
* Owner's Manual: While unlikely to contain the code itself, your owner's manual *might* have instructions on obtaining the code from GM.
* Entering the Code: Once you have the code, the radio should prompt you to enter it after turning the ignition on. The process varies slightly depending on the specific radio model, but usually involves pressing buttons on the radio to input the digits. Consult your owner's manual for the exact procedure for your radio model.
For an aftermarket radio:
* This is much less likely to have a security code. Aftermarket radios generally don't have the same anti-theft features as factory radios. If it's locked, you'll need to consult the instructions that came with the radio or contact the manufacturer for troubleshooting. The problem is probably a wiring issue or a faulty installation rather than a security code.
Important Note: If you're unsure about any of these steps, it's best to take your car to a qualified auto electrician or car stereo installer to avoid damaging the radio or the vehicle's electrical system. Incorrectly attempting to unlock the radio could further complicate the problem.
