VIDA instructions do not have you wait long. The wait is key off befoe you disconnect neg lead. This allows any network activity to cease. Your car has one teeny bit of network between ECM and TCM. The SRS module is purposefully made to power down quickly as that is a safety for emergency responders...

The in hose is connected to the L shaped fitting that goes into the bottom of the check valve. This is the end opposite the red plastic cap that you pry off to replace the diaphragm.