VW T4 2.5 TDI: Install Auxiliary Heater (MSA15)

Hello!

I recently converted my T4 ACV, manufactured in 1997, from a wastegate system to a variable turbine geometry (VTG) system.
Also, please also have the STG (Steuergerät) converted from MSA12 to MSA15.
The intake manifold of the new turbocharger (2003 version) also has a bypass valve attached. This valve allows the engine to shut down gently using vacuum.
It would be very appealing to connect them if I already have them.
Unfortunately, I was unable to find a pinout diagram for the MSA15.
Alternatively, I would like to build something to actuate the flap using the ignition signal. Of course, I want to do it in a way that won't give me headaches later if something goes wrong.
Has anyone ever done this before?

Thank you!

Hi,

Please check what happens at pin 53 when the device is turned off.

Best regards, Rainer.

Thank you for the tip, Rainer!
I will test it at some point .