Model: F150 2010 SuperCrew 5.4 Lariat
Changing head unit to Android headunit.

Original head unit had the feature of remaining on until you open the door to exit. (Accessory Delay).

So I was a little surprised to find that there is NO cable in pin 2 & 3 of the main connector.
All the wiring diagrams for the connector indicate that there should be signals present on pins 2 & 3.
After probing all the wires, I can not find any wire that is acting like an Accessory power signal at all.

So how is the original headunit knowing when to switch off ?

What do other people do to obtain a signal that acts like ACC should do ?