2002 410EC Interface module location

[Camoman]

I've replaced my systems monitor on the dash. Now I'm getting a data link failure alarm. I need to replace the coax but can't find the interface module. The only thing in the engine room is this photo on my firewall. Its not behind the electric panels downstairs.
What is this and where do I look next?

 

[Feet From Satisfied]

did you find it?