A8 Parts Forum  

Go Back   A8 Parts Forum > A8 D3 > D3 - Interior Electrics

D3 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc

Reply
 
Thread Tools Display Modes
  #21  
Old 6th October 2015, 03:29 PM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

I disconnected the charger at 11.30pm, and reconnected the battery. After setting the clock and one touch windows all is good. Left the car until 9am this morning and nothing powered down overnight.

I'll see what the weather is like later and perhaps hook the car up again in trickle charge mode directly on the battery post (-) and battery(+) and leaving the car connected to the battery,
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
  #22  
Old 6th October 2015, 05:54 PM
Burnzybubbles's Avatar
Burnzybubbles Burnzybubbles is offline
Senior Member
 
Join Date: Oct 2014
Posts: 294
Default

I found the BCM messes with the charging of the battery and the only way to fully charge the battery is to disconnect from the car and charge on its own, I left it connected to the car and on charge for 3 days and it still hadn't fully charged, it took 18ish hours iirc to charge fully when disconnected from the car with my 6A RING charger, I was leaving it plugged in and it was still reading low on the battery meter on MMI before hand.
__________________
Reply With Quote
  #23  
Old 7th October 2015, 05:19 PM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

Not sure whats going on now.

Checked battery with a DMM last night at 9.30pm, reading 12.6V with the car connected and awake. Went to go to work this morning and back to square one, battery meter on 15% and all convenience functions disabled.

Either the battery is ***** or I have suddenly developed a worrying persistent current drain. Thing is once the car is in this state the battery stops discharging.

I sat in the car yesterday early yesterday evening and watched the BCM with VCDS as the car went to sleep. After switching off ignition car was drawing 7 amps, which over the next 15 mins dropped to 4.5amps and then lots of relays clicked and the car went to sleep. Sadly VCDS also lost connection to the BCM at exactly the same time.

Tomorrow lunchtime I'll visit the place where I purchased the battery and get them to test it and see what it reveals.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles

Last edited by mannyo; 7th October 2015 at 05:21 PM.
Reply With Quote
  #24  
Old 7th October 2015, 06:42 PM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

Right, I've just got back home and stuck the DMM across the battery, it was reading 12.54 volts after driving the mile back from work. Battery indicator was again at about 15% when leaving.

I've attached a VCDS scan of the car as it was tonight, but I had not cleared the codes since disconnecting the battery. Some of the listed faults were clearly present before I did that anyway.

I've also attached a measuring block log of controller 61, the engine and everything else was off but the car still awake. Column 3 shows the current draw recorded by the BCM of 8 Amps.
Attached Files
File Type: txt Log-LJ04-W-235700km-146457mi.txt (23.3 KB, 227 views)
File Type: txt LOG-61-004-xxx-xxx.txt (7.7 KB, 206 views)
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
  #25  
Old 7th October 2015, 07:26 PM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

Something I am wondering, although the alarm siren is not reporting any faults is, can it be causing an issue since the alarm is one of the last things to be shut down by the BCM as the main battery discharges and once the battery gets to a certain point it stops discharging. I have read of drain issues caused by the siren on here, so as long as its not raining tomorrow I might get time to access the siren and disconnect the wiring.

When I got the car the siren was dead, so I got a used from A8parts. That one also failed 3 months later, so the one currently fitted has been in the car for 18 months but was also secondhand from a8parts when it was installed.

I still have the two older ones, and I know the car is not happy with it just disconnected so if the current draw drops after pulling the connector I could refit one of the other dead ones perhaps?
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
  #26  
Old 7th October 2015, 08:25 PM
mattylondon mattylondon is offline
Senior Member
 
Join Date: Apr 2014
Location: Norwich & L'viv
Posts: 1,673
Default

If you need any current draw values from my D3 for comparison let me know

Hope you manage to fix this problem without too much further grief.
__________________
Matt

2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
Reply With Quote
  #27  
Old 7th October 2015, 08:53 PM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

Something to compare against would be handy.

With VCDS connect to controller 61 and look at the measuring blocks one of them (channel 2 I think) has current flow in amps. With the engine running it reports a positive value since you are putting charge back into the battery. Switch off the engine and press/hold stop on the keyless until the steering lock engages, wait until the interior lights go out and that is where I get the 8 amps from (A negative number since I am now taking power from the battery)

My car has AMI and the full phone kit and TV which appear to be powered until the car goes to sleep, but a rough idea would help.

My car goes to sleep after 15mins but I loose the BCM through VCDS because the CAN gateway goes to sleep as well.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
  #28  
Old 7th October 2015, 09:36 PM
mattylondon mattylondon is offline
Senior Member
 
Join Date: Apr 2014
Location: Norwich & L'viv
Posts: 1,673
Default

I don't have phone or bluetooth, shouldn't matter too much. Leave that with me and I'll get my values to compare. If you don't mind waiting 36 hours as I'll do it Friday
__________________
Matt

2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
Reply With Quote
  #29  
Old 7th October 2015, 10:32 PM
ainarssems ainarssems is offline
Senior Member
 
Join Date: Aug 2010
Location: Rushden, Northants
Posts: 3,799
Default

8 amps with everything off even if it's not completely off but in standby seems a lot. What about that fan control module you mention in another post? I think it's getting power as you can have residual heater on with car switched off and locked. Since you are having problems with it may it's draining your battery. Try pulling the fuse for the fan and see if current draw reduces.
__________________
Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D

8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
Reply With Quote
  #30  
Old 8th October 2015, 07:51 PM
mannyo mannyo is offline
Senior Member
 
Join Date: Jan 2012
Location: Blandford, Dorset
Posts: 1,974
Default

I pulled the alarm siren this evening, there was a drop in current draw on the BCM from 8.2 to 7.9 amps with everything off and the car awake. Question is supposing those 300ma are the siren batteries charging how long would it take for the BCM to shut everything off if that 300ma drop does not stop. Poole Audi have quoted £139inc. VAT for a brand new alarm siren, they sent me the ETKA screen shot. Question is do I spend that on something that may or may not fix it.

Although I have issues with the heater blower controller, I have the solar sunroof, so when you switch off the ignition the supply switches to be powered by the solar panels on the roof. That switch does happen because when the sun is out you can hear the heater blower running, and in the dark all is silent.

I've used the car a number of times today, first thing to drive to work and it was the usual 15% and keyless entry off. Same again at lunch time and this evening. Everytime its always started well without any hesitation.

I am doing a long drive this weekend, so will keep an eye on it.
__________________
Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 06:18 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.