W639 Viano 2.2 2013. Help needed! Where do I connect this plug?

[greg71]

Hello everyone. I have a 2013 Mercedes Viano W639 with a 2.2 diesel engine.
I had to dismantle a large part of the front and now I have a problem with two cables.
I don't know where to connect the cable from the picture.
Additionally, I'm having trouble attaching the external temperature sensor. Picture number 3 (picture from Google - I forgot to take a pic).
Can any of my colleagues help me with this?

 

[m80]

It looks like the 3 wire plug would go onto the alarm sounder.
Temp sensor is within the n/s arch liner. Faces away from engine so as to not see engine bay heat. Route the cable over the cross member.

 

[greg71]

Thank you for your response. I think I can manage with the sensor, but the 3-wire cable is probably not for the horn. In my Viano, the horn is already connected and it has 2 wires.

 

[m80]

alarm sounder.

Not horn.