You can always try a feed from the front speakers to the rears to see if you get some noise out, or even a feed from another source at home to see if the speakers are the problem or whether there is really no feed ?
Though from your post, sounds like you may have proven the above, and you may have channels down on your amp.
The Vogue has the BM54 BMW/Harman Kardon amp in it, which I understand can be problematic as it gets older, and could give you the symptoms you describe.
A member on here (Baris) does an amp upgrade, whereby a higher quality more powersul amp is soldered into your existing unit. This not only repairs any channel issues, but gives a very good sound quality improvement. Do a search on here for "BM54" or "Baris". Before you go that route, I'd give him a call or do some more checks to better ensure thats your problem.
Have you checked the connections to the amp in the boot ?
The BM54 is actually the radio module, but the power amps are inside it.
There should be a DSP unit in the boot too. Not sure how this fits into the equation. I think that processes the sound into discrete channels and then feeds the power amps, so that may also be a culprit at this stage ?
So I'd double check the connectors in the boot and make sure there is also no water ingress in that area.
Perhaps pull the connectors off and reconnect them...etc....etc.......
Good luck
Mark 2011 Range Rover Vogue SE 4.4 TDV8
Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport
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