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[JohnSmith]

Hello, I have a problem with the "Check Control" (fuse number 7) which is draining the battery. I measured 0.27 Amps, and with the fuse disconnected 0.04 Amps. The battery is drained within a week. The battery has been replaced 2 times already. I have the negative pole disconnected now. What could be the cause of the check control to keep using electricity? Would it help to do a diagnostic test with an OBD device such as this one? >> http://www.xxltech.com/

[Doctor Gollum]

Does the car have a towbar socket?

[JohnSmith]

yes I think so.. why?

[Doctor Gollum]

Could be a short in the trailer socket... equally, if a genuine towbar wiring loom was fitted, there may well be a check control module fitted in the boot, if this is faulty it may cause your issue

[JohnSmith]

I don't know.. the check control module is pretty well documented in the user manual.. and nothing is said about the towbar socket.. see pages 40-42

The check control monitors fluid levels, front
disc brake pad thickness, the functioning of
the automatic transmission 3 and the
automatic headlamp range adjustment 3 as
well as important exterior lamp bulbs,
including the wiring and fuses.

[Doctor Gollum]

If you fit a genuine GM towbar wiring kit, it uses (depending if the car has check control or not) a secondary check control unit for the trailer lights

Your car has check control. Therefore if a genuine towbar loom was correctly fitted it will have a second check control module in the left hand side of the boot, attached to the back of the wheel arch.

When I say tow bar socket, I mean the socket(s) attatched to the tow bar.

[JohnSmith]

Yes I have a genuine GM towbar, because on the plastic cap of the socket it says: "GM".. So that's good to know, thanks!

Would there be a way to check if the primary check control is functioning properly?.. I guess I could disconnect a light bulb and see if an error message appears on the display?

[Doctor Gollum]

I would start by testing the trailer socket

[JohnSmith]

ok thanks.. would this be a good guide about how to that? >> https://caravanchronicles.com/guides/13-pin-socket-basic-fault-finding/

[Doctor Gollum]

Looks comprehensive 

Give it a go, and report back...

[Boatboy]

I've been going through this myself recently, though I think its just a dieing battery in my case.

Just a thought though, when I measured my current it was about 250ma, but after 10 mins or so stood chatting to a mate it dropped to 30ma. Is that what check control is supposed to do?

Up to that point I'd been pulling fuses like buggery & cursing the day I scrapped the Dolomite with its two big fuses.

[Doctor Gollum]

I've been going through this myself recently, though I think its just a dieing battery in my case.

Just a thought though, when I measured my current it was about 250ma, but after 10 mins or so stood chatting to a mate it dropped to 30ma. Is that what check control is supposed to do?

Up to that point I'd been pulling fuses like buggery & cursing the day I scrapped the Dolomite with its two big fuses.

Check control is merely a bulb and fluid reporting system.

That drop in current was caused by the consumer relay switching off. Your numbers don't sound right iirc, but the behaviour can be considered normal

[Boatboy]

Cheers.