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There are multiple reasons why the radio in a 2012 Nissan Altima may not be functioning properly. The key is to determine the exact problem. If only the AM/FM radio is not working but other inputs are fine, the likely issue is with the antenna. However, it's common for all stereo inputs to fail in a '12 Altima, which could be due to problems with the head unit itself or components of the sound system like speakers or wiring. To troubleshoot, you should use a digital multimeter to test each part until you identify the source of the problem.
If the radio in your 2012 Nissan Altima isn't functioning, it likely means there's a faulty wire causing the radio to not receive power.