rear climate problems

[JonnyRich]

Hi can anyone help please. Tried to change the temp of the rear heaters yesterday and a message came.up where it normally displays the temp saying passiv. I tried to turn the unit off but came up with the same message. Anybody came across this before? Only thing I have changed recently is I have put an in car dvd in the back which plugs into the 12v socket under the rear heaters. Could this have caused a problem somehow. Thanks for any help

[snapdragon]

Yes, but it was ~4 years ago I read on a forum. All I can tell you is it is not a fault+++
EDIT ---- It's the rear passenger safety button on the driver's door for when children are in the back.
Then, only the driver can control the rear functions via the HVAC screen on MMI>Rear Operation>
See Owner's Manual for more info.