Thread: M1-ATX. How much current through switched 12v?

How much current does the M1-ATX draw through it's ignition switched lead? My car (D3 Audi A8) has it's battery in the trunk so the main +ve and ground feeds aren't a problem, but I can only find really puny lines that are ignition switched.

Does the PSU actually draw anything much down the switched line or is it just a sense wire that is monitored by the PSU to tell it when to draw it's current from the main +ve and ground leads?