Hello! A garage disconnected some pipes during a repair and now the front differential and rear differential are not engaging anymore. The 4x4 on/off works perfectly, no vacuum leaks detected with the smoke test, but somehow the differentials don't work anymore, and I don't hear any PFFFFFF when I turn the diff switches on and off.
Does anyone have a schematic of the pipes connections? are there any valves that I need to check? Thank you very much

Hello,

the Switch in the lower dashboard is the valve.
Just follow the pipes from the switch and the differential.
I think there is just a connection missing.