Go Back   AudiWorld Forums > Audi Models > Audi A4 > A4 (B8 Platform) Discussion
Sign in using an external account
Register Forgot Password?


A4 (B8 Platform) Discussion Discussion forum for the B8 Audi A4 produced from 2008.5-present

Welcome to AudiWorld Forums!
Welcome to AudiWorld.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the AudiWorld Forums community today!


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread Display Modes
Old 03-31-2014, 01:05 AM   #1
AudiWorld Newcomer
Account #: 231795
 
Join Date: Feb 2012
Posts: 4
Default Quiescent current Audi A4 B8 1.8 TFSI

Hi.
Two days ago in my car has gone the battery. I'm a little surprised, because the car is from the year 2011.
After buying a new battery I checked quiescent current of the vehicle.
On the start, the value of the current was about 4 A, and after about 10 minutes, fell to 0.41 A.
Whether the current 0 .41 A is normal?
It's already time to look for a device that "steals" power, and if so, where to start ?
Cheers Andrew
andrzej19 is offline   Reply With Quote
Old 03-31-2014, 10:13 AM   #2
AudiWorld Senior Member
Account #: 160151
 
Join Date: Mar 2009
Posts: 717
Default

Many modules in the car consume current to listen to the CANbus. There comes a point when this is no longer productive as the bus itself has gone quiet.

410 mA is too much. At rest the car should draw 50 to 100 mA, depending on individual devices and temperature.

The first place to look is the obvious culprits, a glove box or trunk lamp.

It might be cheaper to simply ask a dealer to chase the trouble because they have the tools to do that without causing more damage.
Moviela is offline   Reply With Quote
Old 04-01-2014, 01:42 AM   #3
AudiWorld Newcomer
Account #: 231795
 
Join Date: Feb 2012
Posts: 4
Default

Thank you for Your reply.
However, I wonder that, according to various opinion - older cars (without CAN) and later (with CAN) have the same power consumption. (50 mA - 100 mA). I think that these values ​​should be different.
Am I right?
andrzej19 is offline   Reply With Quote
Old 04-02-2014, 10:39 PM   #4
AudiWorld Senior Member
Account #: 160151
 
Join Date: Mar 2009
Posts: 717
Default

Older cars had electronics that drew that amount, mostly engine controls and entertainment systems.

Modern cars with CAN (controller area network) turn the transceiver on and off. When awake LED's in each device draw about 20 mA. When all are asleep they each draw micro amps while listening for a signal. That is why old and new cars draw about the same amount when switched off.

Some modules develop a problem that does not allow sleep, and just like noisy neighbors, they keep everyone else "awake."

You can disconnect different modules to find out who is the bad actor. Problem is they are located all over the car. Some require considerable time to expose using this technique, whereas a dealer can use his online tools to point to the bad boy.
Moviela is offline   Reply With Quote
Old 04-04-2014, 01:20 AM   #5
AudiWorld Newcomer
Account #: 231795
 
Join Date: Feb 2012
Posts: 4
Default

Thank you for your help - tomorrow I start searching for the cause of the problem.
andrzej19 is offline   Reply With Quote
Old 04-06-2014, 12:06 AM   #6
AudiWorld Newcomer
Account #: 231795
 
Join Date: Feb 2012
Posts: 4
Default

Problem solved - it is to maintain the navigation system is drawing too much current. After the repair, the current drawn by the vehicle is 40 mA.
Thank you for your help.
andrzej19 is offline   Reply With Quote
Old 04-06-2014, 12:26 AM   #7
AudiWorld Member
Account #: 176364
 
Join Date: Jan 2010
Posts: 325
Default

Quote:
Originally Posted by andrzej19 View Post
Problem solved - it is to maintain the navigation system is drawing too much current. After the repair, the current drawn by the vehicle is 40 mA.
Thank you for your help.
How did you manage and what method did you use to isolate the problem?
audi8k is offline   Reply With Quote
Old 04-06-2014, 12:26 AM
AudiWorld
Audi R8




Paid Advertisement
 
 
 
Reply

Tags
18, a4, audi, b8, feedback


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 01:08 PM.


Copyright 2014 AudiWorld.com Audi Enthusiast Community