Hey mate.
I can only your Park Assist question as I have the PA in my Tig.
When you put the Tig in reverse the sensors automatically activate. If you want to manually activate the sensors there is a button to do so in the center consol. The same button can be used to manually turn the sensors off. The sensors will automatically disable as soon as you go over 40km/h (I think... may be slightly slower). When you turn on Park Assist (the button to do so is located right near the parking sensor button) the parking sensors automatically engage.
Hope that's clear and helps. Basically, the Tig is smart enough to know when it needs to turn the sensors on, and will automatically turn them off when it assumes you don't need them. But you can manually override the car smarts by using the button.
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