It may not be the kit offered in the Grenadier but this is what Eaton ship as part of the general fitting kitThe diode is probably mounted on a printed circuit board....There may be other components on the board, the diode being there to "suppress" voltage spikes from operation of the relay and solenoid. Most of the relays probably have diodes in them anyway for the same purpose.
I'm wondering how many indicators of when the diffs are locked we will get ~ maybe three?The central display screen showing whether or not the diff locks are engaged
Eaton talk of illuminated on switches, but that may be because in aftermarket kits there is no other option offered. Anyone asked the question whether these, or any other of the switches are illuminated?
Then there's the central screen in the offroad menu.
And finally, there's the screen/panel immediately in front of the driver.