Battery drain

[techhj]

Hi all.
Following a leak down test, fuse 38 - On mine is the central locking..et al. - using over 1 amp all the time.
The carpets are not damp. The central locking works OK with the fuse in. VCDS gave 8 weird faults all were cleared OK.
Could anyone please suggest the most likely start place to search for the short please?
Many thanks.

 

[desertstorm]

Did you give the module time to goto sleep ?. The current doesn't drop immediately, after a minute or so the module goes into a low power sleep mode.If there is an issue with the Data bus and it's lost a leg or the car isn't shut properly it won't fully power down.
What were the codes you saw ?

 

[techhj]

Thanks desertstorm for your reply. I have checked the battery drain on numerous occasions and following the battery disconnect overnight. Doors closed, of course. It's still over 1 amp. The fault codes I had as follows:- 01300. 01572. 01370. 01368. 01562 x 2. 01134 x 2. When the cars not in use I am disconnecting the battery.
Thanks again. HJ

 

[desertstorm]

http://wiki.ross-tech.com/wiki/index.php/01572
01572 - Alarm triggered by Door Contact Switch; Passenger Side

01370 - Alarm triggered by Interior Monitoring
http://wiki.ross-tech.com/wiki/index.php/01370

01368 - Alarm triggered by Luggage Compartment Switch


http://wiki.ross-tech.com/wiki/index.php/01562
01562 - Rear Right Door: Can't Unlock


http://wiki.ross-tech.com/wiki/index.php/01134
01134 - Alarm Horn (H12): No Signal/Communication

Have you disconnected the alarm horn / siren ? Think it's in the boot.
http://www.audi-sport.net/xf/threads/audi-a4-b6-alarm-siren-replace-nimh-batteries.90361/

Do all the doors locks and unlock correctly. As I said earlier the module won't goto sleep properly if the car isn't locked.
Check the connector blocks in the footwell on the front passenger side behind the footwell kick plate at the bottom of the A pillar for corrosion and bad connections due to water ingress. CCM may be dry now but water leaks years ago can cause issues.

 

[techhj]

Thanks again for your response and advice.
All the doors lock and unlock ok with the key fob. The car is an avant and right hand drive, if this makes any difference. I had the wet carpet thing a few years age and sorted that out. It's been ok since but I take you point about corrosion. I will have a go at the module and let you know what I find.
Many thanks. Howard

 

[desertstorm]

make sure you check the connectors on the A pillar. Seen this several times on Passats where they have a similar set up. If you follow the cables from the CCM they run to the connectors.

 

[techhj]

OK I have pulled the module casing out of the car and looked inside at the unit and electricals and everything looks fine. No moisture inside the box and no sign of anything wrong, although there is a bit of wet on the floor below the box. Trying to dry that out now.
H

 

[techhj]

The cables and connectors at the A pillar all look good. I have not disconnected the alarm siren (As per your previous post), should I?
We have had the common problem with shutting the pax door when cold. We always get it shut after a couple of goes so the "Door not closed" should not be an issue.