to me, it is a very good and important test you did for me. it seems like my assumption is correct that it needs a CAN signal to turn on the screen. so i guess you won't see the display lid up or has backlight because the voltage drops after that. i cant say enough thanks for doing all that to find out. cheers.

 

Yes and no, in one case I got 12.2V with MY20 unit without CAN - not sure if that was time I looked well at screen to see backlight - this may come separatelly. Also, with 2nd gen unit I tested yesterday, without any load/display I seen 12.34V with every a few seconds glitches down (DMM voltage was jumping down and up hard to say what voltage), and during that test I had th. Looks like there is some sequential logic anyway which we do not understand nearly at all (possibly partially related to CAN presence, but possibly related to talks with display itself; may be test phase, may be some retries time, may be later give up phase etc), so hard to assume anything just based on simple measurement - can be either good or bad ETM or cable or display in your case.