02 F250 autoheadlight problem

on the 02 F250 headlight circuit, the wiring diagram shows a "headlamp relay" and "microprocessor" as being part of the main light switch, in the
line between the auto light switch and the sunload sensor. are these units part of the headlight switch, or are they separate?? i have the proper light switch installed, the sunload sensor installed, but still get no power to the red/yellow output wire.
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