Discovered a new "feature" in mine yesterday. I'd heard random chimes (more of a "ding" rather than the usual "bongs") from time to time when driving and not seen any reason for them, no warnings on the screen, nothing.
Then yesterday, I had to take my dog to the vet, so, as usual, put him on the back seat and plugged his safety lead into the centre seat belt position.
Two miles down the road, and the chimes started up again, this time continuously. Unlike the last few times I'd heard it, I did notice a red seat belt warning on the screen. I couldn't understand why for a time, but then it struck me.
I'd plugged the dog's safety lead into the centre seat belt position, but the flippin' dog had fidgeted over to the left side, so the car now thought that there was a passenger sat on the left of the rear seat, and with no belt plugged in there it set off the "seatbelt unfastened" warning (I have to say my dog is a not unsubstantial sized labrador). Not being in a situation where it was easy to pull over, I had to put up with the incessant "ding, ding, ding" for several annoying miles.
So, word of warning, if you have a dog on the rear seat, plug in all the unused belt buckles!!