Pretty much, generally when people put in the optional switches, it is to give them a little more control over the unit, for instance, if they are only moving the car from the end of the driveway into the garage, they can flick the switch off, and stop the unit powering up for the short trip.
So they put the switch inline with the ACC+ line, so it runs from Battery to one side of the switch, and the other side of the switch to the M2.
When the switch is on, the system powers up with the ACC as per normal. But with the switch off, the power never gets to the M2 to trigger the turn on, and the system stays shut off.



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