Yaris 1.4 D4D Intercooler small hose & Airbag light

[mecheng46]

I recently got a 2008 diesel yaris and it looks like somebody disconnected the small hose that goes from the front of the engine all the way to the bottom of the intercooler. This hose starts from the engine front area under the EGR cooler, it crosses the gap in front of the engine, it goes down the water radiator and it ends up on the bottom left side of the intercooler. It is joined together with one of the big metal water pipes around the engine and it's possibly 6mm outside diameter. It's blocked off on the engine side at the moment.

 

I am not sure why would somebody disconnect this hose but I found it loose around the engine during servicing.

 

The car also has the airbag light on and I am wondering if there is any way to find which airbag is causing the light to come on?