"Full Accessory Mode" vs starting vehicle... ?

[TaxmanHog]

My 24 Flash also powers the 12v system from the HVB in accessory mode. LVB BCM reports 0 amps in accessory mode. I haven’t ever exceeded 15 or 20 minutes in accessory mode, so don’t know if it times out in my truck.

I believe the 30 minute timer will shut down this mode.

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[HOTAS]

I want to revisit this thread because there is some misinformation and apparently misunderstanding (about full accessory mode) in the first few posts.
“Full accessory mode“, accessed by one push of the start button, (brake Pedal NOT depressed) is very useful, it allows full access of all 12V & USB plugs, including the 7 pin trailer harness 12V (high load) output, in addition all other 12V accessories like windows, lights, fans, infotainment, frunk/tailgate opening etc.
And the real beauty/benefit is it’s all done WITHOUT draining the small 12V battery. How?
In Full accessory mode a DC-DC converter is supplying a continuous 13+ volts to power all the 12v accessories , prevent a voltage sag during their use and keep the 12v battery charged.
This is exactly the mode everyone needs to be in when using any 12v accessories. Full accessory mode has a timeout that can be overridden in the vehicle settings screen.
(This is not to be confused with the retained power mode that briefly exists after total shutdown of the truck. That is a simple retained power mode for infotainment and 12V/USB use while exiting the vehicle, that drains the battery. That’s why retained power mode is brief, cannot be overridden and the 12v trailer harness (high load) output IS NOT available.)
So I don't see what the criticism of full accessory mode is.

 

[HOTAS]

i Think it’s also important to realize the 12v DC accessory system is completely separated from the 120/240 AC ProPower system.
ProPower can also be run in Full accessory mode.

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