Thanks ccfj1. Thats just the part that doesn't make sense. I mean, I know that it works to do so, I've tried it and it works, BUT cars that have this audio setup don't use a jumper.
They only have pin 1 wired.
Seems that what really needs to be done would be to use the power from the same pin 1 on the same connector (shared with the MOST optical bus) from the CD changer (X18180).
The reason being that the AMP, when powered by the higher power 2-pin connector has permanent power. If you short the pins 1-2 on the 4pin connector, the AMP is at very least partially ALWAYS powered.
Sure the MOST bus contains the remote AMP power on command, but how would the amp read the MOST bus without power to its MOST circuitry.
This is where pin1 of the 4pin connector comes into play. If connected to the same pin on the CD changer connector, it is connected to the 30g power bus. It only receives power when needed.
Hope what I'm saying makes sense.