Hello,
The most likely cause of this type of fault is usually associated with:
A. a short circuit somewhere in the wiring loom where a permanently fed live circuit has been breached and is now making contact with an ignition or auxiliary fed circuit.
B. a short circuit in an electrical or electronic component that is also causing a permanent live feed to remain present in a normally switched service.
C. a component such as a relay or other switching device that would normally disconnect a switched service, but who's contacts have stuck or welded together, keeping the feed live.
If you feel confident enough to try to locate this problem, I would start by removing each fuse in turn until you come across one that will switch off ALL of the affected services. (not just one of them as this could be the designated fuse to that one particular component)
This is a very difficult and exact procedure that should be carried out by a qualified Auto Electrician, but if you intend to go in blind, then please take particular attention to the following points:
1) IMPORTANT! if your battery drains to the point where you can not restart, then please, please, please...DO NOT use jump leads to try to restart. Any surge experienced by either your own car or the donor vehicle during connection could cause a catastrophic failure in any of the ECU's in either vehicle. For safety's sake, remove the battery for bench charging - or at least, disconnect the battery's earth lead.
2) when replacing the battery after charge, leave the earth lead connection until last.
3) when removing fuses during your diagnosis, DO NOT disconnect any fuse or component associated with the air bag system
4) be prepared for some inconvenience should the security system and immobiliser loose it's programming and prevent you from restarting due to lock-out.
5) should this problem suddenly appear to right itself, it should not be left. It will most certainly return at some point -usually at the most inconvenient time.
I am sorry if this seems to be a gloomy message, but I cannot recommend more highly, that you seek the help of a qualified auto-electrician.
Kind Regards,
Eric (Auto-Electrician)