X308 XJR Rear Parking Sensors

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I have seen a few threads on these so will try and be brief. Needless to say, I haven't found my answer yet.

I can hear all my rear sensors pulsing/clicking as these should, however I get no rear parking assistance tone whatsoever. This used to work but has gradually got worse and worse and now hasn't worked for 6 months. It got to a point where i put it in reverse and it would just be a constant long tone. The wiring must surely be fine because all the sensors have power to them, hence the clicking. I happened to have just replaced the rear bumper with a better one which included sensors and they all click nicely as they should. I also replaced the rear park module in the boot in case that was duff. No change. Any suggestions appreciated.

Cheers

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CharlieAlphaMike said:

The constant long tone would indicate that the sensors were dirty but whether that eventually leads to 'no tone', I have no idea. Might be worth giving the sensors a good clean though (and it wouldn't cost anything to do this).

Appreciate the thought. I cleaned the sensors as a start and all click away happily. Replaced the module for another, however sensors click away on the old module and the newer one also. I can only think this must be something to do with the speaker or the wire going to it. I assume the speaker is in the space between the boot and the rear seats. Probably have to rip all the carpet out and teach myself how to do electric testing.