the ACC wire from the stereo is connected to constant power (+12V)
your ground wire for the stereo is connected to the ignition wire of the car
it is still running off the battery, most of the time it will turn off when you open the door
it provides a signal to your subwoofer amplifier to turn it on and off with the car's key
P.CONT is a turn-on lead wire for your external amps if you have them. All it does is sends a signal to your amp (if you have one) to turn on/turn off
Fuse. Also did you have it on full blast? That might do it.
Put it in your car, turn it on and see what happens.
Turn your radio off before you shut your car off.
Fault in the wiring, loose harness pins, or bad head unit is what I'd be looking for.
Because they're wired that way. Otherwise if you forget to turn the stereo off for instance it might have drained the battery until the next time you wanted to use the car.
If I remember, turn the stereo on, enter the code using the 6 preset buttons. After the beep, turn the stereo off. Then turn the stereo on and it should be OK. I just pulled my radio to get into the dash.
The headlights turn off because you have accidently hooked the stereo's power wire onto the headlight relay wire. When you turn on the stereo, there's not enough power left to run the headlight relay. Thus, no headlights. Re-wire the stereo.
Sims can drive with music playing. If you click the vehicle and click "Sit in Vehicle." Then when the Sim is in the car click the car again and choose either "Turn Lights On" or "Turn On Stereo." Then if you want to change the song again click the car and either click "Play Next Song" or "Change To..." Then once your done with that click either "Drive To Community Lot" or "Take a spin." But when you get out of the car you have to turn the stereo or the lights off because they don't go off automatically.