1994 c280 w202

Can anyone tell me which system the clear line is connected to? For that matter what are the other lines connected to? I think the 5 yellow lines are for the doors and trunk but what about the other 2 lines (the clear one and the ....other one?) Thanks for the help.

__________________
If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon