W209 convenience feature misbehaving

[Clkrichard]

I had both the seat and steering wheel set to move on removing the key on my CLK cabrio and recently that has stopped working. I have checked the menus and reset to both several times but that didnt work. All the seat motors work from the switch on the door.
Anyone got any ideas ?

 

[Bobby Dazzler]

Low battery voltage - would be my suggestion - it's the most obvious non-critical item which stops working to reserve battery life.

 

[Clkrichard]

Thanks BD ..... Battery is only 18 months old and there are no other symptoms .... The starter motor spins strongly and the engine fires up quickly.
Yesterday the seat sliding back was working but the steering wheel wasnt moving up - all a bit odd !