I just picked up an '01 LW300. Same there too with the reset button under the main fuse block near the battery...
It may be worth to you to get a replacement owner's manual. I sat and read it cover to cover last night and there were a few items that were not intuitive. Well worth having.
Like you, I also change oil and do most of the PM and repairs. I intend to get the service manuals (~$150) and an OBD2 adaptor for my laptop computer. I've been looking at the autotap unit.
Happy New Year,
Oppie