This worked on my 2015 LR4. Auxiliary battery is under hood below black cover. Remove Neg battery cable, system is completely off. BUT orange ECO light stays lit in the IP. If you press ECO button, message pops up in IP "ECO mode unavailable"
ECO mode is totally annoying. Intervenes too quickly, especially when parking, will **** motor 3 times on one parallel park. Would be tolerable if there was a slight delay before kicking in.
I may wind up reconnecting, though. The orange idiot light is almost as annoying and I can't bring myself to put electrical tape on a $60k+ vehicle.