This may seem a daft question, but after a quick search found that it was one that went unanswered a while back so I will give it a go myself...
When I purchased my bongo a few months back, I was delighted that it had electric blinds as my old bongo was manual so I know how fiddly they can be.
The only issue is that they don't seem to work off the leisure battery!! This means that even though there are 4 individual switches in the back, you have to go round to the front to put the key in the ignition to give power to those switches in the back... but there are actually two switches in the front too which activate them all!!
I can't help think this cannot be the norm. Clambering to the front to put the key in seems to defeat the object of electric blinds and I don't see any benefit over the 'fiddly' manual system.
I did read somewhere that there is a switch to transfer power to the rear, which seemed a little daft. But I did find these two switches at the front...

Sadly, neither of those switches seem to do anything whatsoever!!
Any ideas?