Head Unit Installation Problems!!

[Microman23]

Hello, my friend just replaced her head unit in her 2002 Toyota Camry. After a few problems, and then troubleshooting them, we have almost got it all hooked up right. Except that the ground isn't connected, but the head unit still powers on.... anyone know why this would be happening??

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[audioman14]

its grounding of the body,antenna,or wirers...you need to connect the ground wire before you damage the headunit