question on the 02 F250 auto headlights

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 seperate??

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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Tom
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