I recently installed a 500/1 JL Audio Mono Amp in a 2000 IS 300. The customer is using the
factory head unit, so I used the amps auto sensing capabilities. The auto sensing feature allows
you to get turn on remote through the input signal from the amp, the remote wire does not have to
be hooked up. Everything sounds good, until I shut the car off. The amp stays on for about 30 seconds
which is normal, but while the car is off you can hear a low frequency sweep go through the entire
car. The wierdest part of this problem is that it goes away if you open the trunk. I figured out
that the left input of the amp was making the sound. Do you guys have any clue what this can
be? Keep in mind that the low frequency goes away after I open the trunk.