wetokole

I have a 2000 S Type 3.0 V6. I am having a wee bit of a problem with the reversing sensors. They used to work fine 'til a couple weeks ago then they stopped. Now the interior switch does turn on and off but as soon as reverse is selected, whilst it is in the "on" position the sensor bleeps once and then turns itself off. Anyone got any ideas please? Just a little secondary question, how does one remove the upper switch console? Once again thanks in advance.