Here we are in 2015 and trip reset is such a PITA... On my LCD you have to press the up and down arrows simultaneously after it has been on for 5 seconds then briefly on the on/off switch.
Yes it did take me a while to get it right. Yesterday I did it when I was on the wrong screen and it wiped the total trip distance!!!
So I am now dreaming of a bluetooth connected controller with a simple interface to do such things. For those of you who have connections with our Chinese overlords er friends there is a man machine interface designer looking for work here
hell I could even write instruction manuals in NZ English while I'm at it!