I'm not sure what the early AAV looks like, but mine looks like a drum on a cone that sits on its side, with an L-bracket attached to the drum to mount the whole thing. The inlet air comes in one side of the drum, and goes out (to the intake) from the other side. The two wires (two is why I think one is ground) plug into the end of the cone. It definitely doesn't look like the pic of an AAV on the Pelican site, which is more like a little barrel with both hoses on top. If it helps, it's the same as the later Bus, because I got some L-Jet FI parts from a Bus and the AAV is the exact same Bosch number. I was able to get it to close with 12V by connecting to the two spade connectors sticking out the end of the cone.
From what I can see on the early D-Jet wiring diagrams, the AAV was grounded all the time, and the 12V+ was supplied as long as the fuel pump relay was engaged. The L-Jet looks like it also has 12V+ power when the pump is running, but the ECU only grounds it once the head temp gets to the right point.
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