There's a lot of variation in these cars because of the different engines fitted - my 3.0d diesel is somewhat different from your 3.0i petrol.
This thread from 2015 indicates a similar problem locating the starter relay: -
https://xoutpost.com/bmw-sav-forums/...n-mystery.html
Despite searching, I've yet to find any info that shows an e-box layout like yours, with only three relays in that area. Still searching though and in the meantime, hopefully someone that actually has a 3.0i LCI car can chime in!
