Navi problem, won't go into sleep mode & drains the battery

[Max_e46]

Hi,

I have a 2001 330Ci with navigation and recently I started having problems with it. Well.., it is actually one problem. It won’t go into sleep mode after the car is turned off and locked. If I don’t drive the car for a couple of days the navi would drain the battery. I have an mk3 computer which is not the original unit but it worked without any problems for about 6-8 months. When I got the car I had to replace the original unit because it was dead. I have searched the net and many forums without any luck. Does anyone have any suggestions how to fix this problem? Any help will be greatly appreciated!