How can this part be tested

[Marktee]

This part is from a Mercedes prefuse box. I checked it for continuity by checking the two yellow marked wings and got close to zero. The part has a four prongs plug as well. What can I check to see whether the part works or not<<

 

[DPG]

This part is from a Mercedes prefuse box. I checked it for continuity by checking the two yellow marked wings and got close to zero. The part has a four prongs plug as well. What can I check to see whether the part works or not<<

What is it? I'd be trying a Mercedes forum i think.