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Your stereo is not networked with any other modules. It stands alone on the ACP network (Audio Control Protocol). Diagnosis of entertainment systems is done by holding a combination of buttons on the radio. A/C is controlled by the PCM. The main body controller on a ford is called the Smart Junction Box (SJB). The SJB is a combination fuse box, relay board, & networked module. The SJB contains the Generic Electric Module (GEM), the Front Electric Module (REM), & the Rear Electric Module (REM). The GEM, FEM, & REM control your interior & exterior lights, windows, etc... There maybe more or less modules depending on equipped options.
I'm not familiar with the ELM327, so I'm not sure exactly what PIDs are viewable. If you record a snap shot (should be a function of the tool) & post a pic, I could tell you about the PIDs you don't understand.
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