Deep sleep affects more than just app functionality. As mentioned it also disables items like the dome light when opening the door, IntelliKey unlocking for the passenger door on Lariat, the IC/Radio booting up on door open, and the timers for post-shutdown power such as the USB ports and bed...
That is just for powering the high beam. The low beam (and DRL on Lariat) have their own power input circuit.
The diagram doesn't show what's happening within the headlamp assembly because it's irrelevant; it's not serviceable. As long as its getting power, has ground, and is talking to the...
Again, you're getting hung up on the part that the switching is happening within the headlamp assembly itself. So the high beam wire into the headlight can be energized all the time, but that doesn't mean the high beam itself is on.
Pretend the diagram looked more like this
When the BCM...
How is the diagram wrong? If the BCM is energizing the High Beam FET and thereby closing the Enhanced Exterior Lighting Relay at vehicle start then that's all still accurate. The difference is the meaningful part--energizing the LED arrays themselves--is occurring within the headlamp assembly.
The only difference in functionality in regards to the Lariat is it gains Evasive Steering Assist which increases the steering rate when the Pre-Collision Assist system has activated.
Pre-Collision assist has been included standard feature on all model years, all trims, irrespective of the...
Or, as mentioned, it's not as simple as 'wire has voltage, light turn on'.
Service manual description of operation:
When the BCM reads a request for the high beams, it sends a message through the headlamp LIN circuit to the LED control module inside each headlamp assembly. The LED control...
Pre-collision assist is standard on all trims. If the forward looking camera system thinks your closing rate with an object in front might result in a collision (depending on sensitivity set in the instrument cluster settings) it will display the alert. The system primes the brakes for emergency...
I don't know where you get the impression Ford is pretending this isn't a software defect. The recall documentation literally states they determined it was due to the firmware programming configuration.
I don't recall off the top of my head if the fog lights can be set to operate with the high beams only.
Edit: Nevermind, I see from your post in another thread you already have fog lights on an F-150 switch.