All Things Mk5 > How to Guides / Troubleshooting

Battery drain single wire error help!

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dr_schnell:
Hi all

I hope someone can help as I am at the end of my tether with a battery drain problem.

I have a problem which was draining the battery almost overnight, I think the car has previously had some issues regarding drains according to some of the service notes so I took it back to the dealer that supplied the car (non-VW), they didn't instill allot of confidence and idn't fix it after 2 tries  :fighting: so I decided to try and resolve the issue myself.

First thing I did was to buy a new battery, no solution.

I then pulled the fuses to identify which circuit might be at fault, this was successful and identified the fuse linked to the rear power windows and the central connivence module. With this fuse removed no battery drain but I think my alarm is not set and I'd like a permanent fix.

Since that I have managed to get a vcds scan and the only error is a
1 Fault Found:
00470 - Combination comfort Databus in Single Wire
011 - Open Circuit


After a bit of reading on the net  :fighting2: I assumed that it was a cracked wire in the door hinge but of no avail. all look fine in drivers and passenger doors.

I have narrowed it down to the rear drivers side door as you can hear that it locks slightly out of sync and a measuring block test identified that it is working in 1 wire mode.

Therefore I replaced the door module... but with no success.

Any thoughts would be greatly appreciated, I should mention that an after-market tow bar has been added and roughly spliced into the rear lights, could this be a potential source of problem?

Eddie-NL:
where are you located?

dr_schnell:
Hi Eddie

Sadly in NI, otherwise I'd have requested your help.

Just a further note to say that it has an updated can gateway supplied by yourself  :happy2: so that isn't at fault.

I also changed the central connivence module over and gain no fix.  :sad1:

Ruthlessness:

--- Quote from: Eddie-NL on September 01, 2014, 09:33:16 pm ---where are you located?

--- End quote ---

Hi Eddie,
Is there any chance i get  a contact number for you,
I too have battery drain and could really do with some help.

Eddie-NL:
07954653918

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