Can't find PCM

[packnheat]

I'd like to install a mystery switch but I can't find the PCM. Already looked on passenger side firewall, not there.





















2004 Quad Cab 4x4 2500 HO Auto 3. 73 Edge Gauges

 

[Pawpaw]

04's don't have a PCM. The Cummins ECM does it all.