Bought a car with uprev.. any maps on it?

[Asus_]

Hi guys i recently bought a 370z. Thread here if anyone is interested Torn between which Z to buy tomorrow. Advice appreciated.

Anyway, i opened the glove box and i found the uprev box with the cables inside. I watched some youtube videos on how to change maps and i want to attempt to see if there are any maps loaded on the car. From what i understand in the video is i hold down the deceleration and press cancel to the number of the map i want...(1 cancel for map 1, 2 cancels for map 2, etc...) and the cruise control light should blink.

My question is, by doing this will it work in my case? if so how do i know there are actually a map loaded and its actually changing? will the light not blink if there is no loaded map?

Edit: also is that all uprev is? just the cables? i was under the impression it might of been a chip of some sort, sorry if that sounded really stupid lol