L405 Rear seat operation fault

[goddo]

2016 L405 V8 Diesel:
Just discovered a rear seat anomaly that I can't see to fathom out. The rear seats have a lever for adjusting the angle of the seat and a round button for adjusting the squab pressures.
In the boot there is a panel with four buttons that should raise lower the rear seats as well as moving the front seats forward out of the way of the rear head rests. One set of buttons seem to be working in reverse and the other set seem OK.
The levers on the side of the rear seats do nothing on either side.
I ran an iCarsoft LR V2.0 diagnostic on the car and it doesn't show any faults that I could find.
Has anyone had this problem and a) how did you rectify it and b) Is the iCarsft LR 2.0 diagnostic kit good enough for this problem?
Thanks in advance for any help.

[OlivierOliOli]

Turn off the child locks for the rear doors. That did the trick for us.

[goddo]

Thanks for the tip Olivier.
To disable, is that the small plastic insert inside the rear door shut with a slot in it?

[goddo]

Well, I tried disabling the child locks on the rear doors and it did nothing to help with the seat problem.
Anyone else have any ideas, please?