Amplifier won't turn off

I have a Kenwood KAC-729S 600W which is giving me a hard time.  As long as 12VDC is applied from the battery, the amp is on.... regardless of whether or not the switched 12VDC is available.

I broke out my Fluke meter and checked the switched 12VDC lead from my head unit, and verified that my vehicle wiring is in fact, good.  It seems as though the "switched 12V" circuitry in my amp is faulty, causing my amp to remain on at all times.  As a temporary fix, I have installed a kill switch on the 12VDC lead to keep the amp from draining my battery.

Has anyone else experienced this problem with an amplifier before?  I really need a schematic to troubleshoot it down to component level, but have been unable to find one.  I did take it apart, but found no visual indications (e.g. burned components, "hot spots" on the PWB, or damaged foil runs).

if the ground is bad the amp will turn on by itself

I measured the resistance between the GND terminal on the amp, and the chassis itself.  My meter read less than .2ohms.

Thanks for the advice though...  I'll look for a better grounding point and see if that works.

    You have a shorted transistor on the turn on path.  You can fix it without a schematic,  just follow the remote trace and look for a small transistor in that path that is shorted,  The remote trace goes from the connection on the outside of the amp to a 16 pin chip  with the numbers 494  or 594 on it   TL494  TL594   UPC494  UPC594          it goes to pin 12 of that chip 

I double-checked my ground.  Less than .2ohms from the ground terminal on my amp to the chassis.

There are no IC chips in the remote 12VDC circuit.  This amp uses the common tripod transistors.  I'm currently researching the part numbers to see if I can find the specs on them.  This afternoon I'm going to check them out with my meter.  I'll reply back with my findings.

Thanks again!

Trust me there is a 494, 594 IC controlling the power supply of your amp,  Kenwood sometimes likes to put them off in left field way away from the rest of the supply.

  Common Tripod transistors??????????????????