help with epb faults.....but epb works

[nycaudi]

could not find much help on a search of this topic, but basically my epb works. if i clear the codes they come back after about 1 minute of turning car on. Has any of you fixed this issue?



Address 53: Parking Brake (J540) Labels: 8K0-907-801-V1.clb
Part No SW: 8K0 907 801 E HW: 8K0 907 801 E
Component: EPB Audi B8 H05 0060
Revision: 00000003 Serial number: 10000000116182
Shop #: WSC 00000 000 00000
VCID: B12A5213E864B7CA9F-80E4

2 Faults Found:
02435 - Supply Voltage for Control Module for Right Channel
008 - Implausible Signal - MIL ON
Freeze Frame:
Fault Status: 11101000
Fault Priority: 3
Fault Frequency: 1
Reset counter: 128
Mileage: 161100 km
Time Indication: 0
Date: 2008.06.23
Time: 05:36:07

Freeze Frame:
Voltage: 13.90 V
Count: 25
Speed: 0.0 km/h
Hex Value: 0x0270
Hex Value: 0x0001
Hex Value: 0x0101

02434 - Supply Voltage for Control Module for Left Channel
008 - Implausible Signal - MIL ON
Freeze Frame:
Fault Status: 11101000
Fault Priority: 3
Fault Frequency: 1
Reset counter: 128
Mileage: 161100 km
Time Indication: 0
Date: 2008.06.23
Time: 05:35:37

Freeze Frame:
Voltage: 13.90 V
Count: 24
Speed: 0.0 km/h
Hex Value: 0x0260
Hex Value: 0x0001
Hex Value: 0x0101

[The Infiltrator]

http://www.audizine.com/forum/showth...ting-and-Fixes

[nycaudi]

That link is more of a novelty than anything remotely useful.

Ill be sure to post the fix in there if i find one through my own channels or if aomeone here is kind enough to help out

[The Infiltrator]

That link is more of a novelty than anything remotely useful.

Ill be sure to post the fix in there if i find one through my own channels or if aomeone here is kind enough to help out

That's why you're supposed to post your issue there, someone help you and the fix posted.

[elscotto80]

That's why you're supposed to post your issue there, someone help you and the fix posted.

[van462]

I don't know is system that well but I went into VCDS to get some baselines that may help narrow it down. This in from an 09 with auto trans.
I went into Module 53- Parking brake and under advanced measures was curious to see what was in there. I have a log below.

Address 53: Parking Brake (8K0 907 801 F)
Current Vehicle Inclination Angle 0.584 m/s^2 (I assume this is used for the antiroll back feature) I was on a very slight incline, nose up
Shut-Off Current Left (Calculated) 17.200 A
Shut-Off Current Right (Calculated) 17.300 A
Brake Status (Left) (closed )2.0 (open) 3.0 it flickered 4.0 when I activated switch until the motor stopped at open and then changed to 3.0
Brake Status (Right)(closed )2.0 (open) 3.0 it flickered 4.0 when I activated switch until the motor stopped at open and then changed to 3.0
System Status Lamp 00100100
Display Text (System Status) 3.0 (Display read parking brake under diagnostic on center dash display)
Operating Counter Left (x2) 2527 (Counts the number of actuation)
Status Terminal 15 Term 15 On ( I assume this is supply voltage or that a ground is present..unsure)
Gateway (J533) Gateway 1 (Assume can gateway) If this is blank the ECU doesn't have communication?...maybe


Also have you disconnected the battery to clear faults? I noticed the fault date as 2008. I am unsure if the ECU uses the date set thru MMI or its own internal clock.

[nycaudi]

I don't know is system that well but I went into VCDS to get some baselines that may help narrow it down. This in from an 09 with auto trans.
I went into Module 53- Parking brake and under advanced measures was curious to see what was in there. I have a log below.

Address 53: Parking Brake (8K0 907 801 F)
Current Vehicle Inclination Angle 0.584 m/s^2 (I assume this is used for the antiroll back feature) I was on a very slight incline, nose up
Shut-Off Current Left (Calculated) 17.200 A
Shut-Off Current Right (Calculated) 17.300 A
Brake Status (Left) (closed )2.0 (open) 3.0 it flickered 4.0 when I activated switch until the motor stopped at open and then changed to 3.0
Brake Status (Right)(closed )2.0 (open) 3.0 it flickered 4.0 when I activated switch until the motor stopped at open and then changed to 3.0
System Status Lamp 00100100
Display Text (System Status) 3.0 (Display read parking brake under diagnostic on center dash display)
Operating Counter Left (x2) 2527 (Counts the number of actuation)
Status Terminal 15 Term 15 On ( I assume this is supply voltage or that a ground is present..unsure)
Gateway (J533) Gateway 1 (Assume can gateway) If this is blank the ECU doesn't have communication?...maybe


Also have you disconnected the battery to clear faults? I noticed the fault date as 2008. I am unsure if the ECU uses the date set thru MMI or its own internal clock.

thanks van for running that log so i can compare it, i actually just came back from having a go at it again.

this time i ran vcds with the car running, cleared the codes and did all of the basic setting modules except the counter resets at the very bottom. i cycled te power and ran the tests again and the auto scan didnt show any faults in the epb...but once test was done, the paarking brake light came back on with the error. i scanned the code and it said only the left side had low voltage instead of both sides. i cleared codes and restarted vehicle but then both left and right came back with the same codes. Funny thing is that the epb works and when runing the testes it does apply voltage to both sides and i hear the brake engage and disengage.

Needless to say, im a little pissed and confused as to how to fix this "error"

and no i havent disconnected battery will probably try this tomorrow. the date on the mmi is current, im not sure where its getting 2008 from or how to change it.

[van462]

My guess is it is not getting status to know if the brake is engaged or disengaged. When you engage the brake does the red light on the switch illuminate to indicate engaged?

[nycaudi]

My guess is it is not getting status to know if the brake is engaged or disengaged. When you engage the brake does the red light on the switch illuminate to indicate engaged?

Yes the status light on the finger switch lights up red and and my dash the parking brake symbol lights up when i apply the parking brake. When i release, both of thw lights go off and i can see the current drop on vcds. From 17.3 on both sides and i believe it was 2 amps. Ill take a vid later and post.

Thanks!

[nycaudi]

My guess is it is not getting status to know if the brake is engaged or disengaged. When you engage the brake does the red light on the switch illuminate to indicate engaged?

https://youtu.be/i4WyERJth7o

Please see video above for error code after clearing fault and activating brake.

https://youtu.be/O-M5zoZPtuo

Video aboke this shows advanced measuring values.



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[nycaudi]

hope you see this @ van462

[van462]

I wonder if its the inclination sensor causing the error. Yours reads .000. You have an auto and it uses this data to prevent vehicle rollback. If you have a steep hill nearby try stopping on the hill and let off the brake. The car should have the rear brake engaged and you feel it squat in the back a little. The system seems to sense the opening and closing just fine as the status changes appropriately.

http://wiki.ross-tech.com/wiki/index..._Parking_Brake This states the sensor is part of the parking brake control module.

[nycaudi]

I wonder if its the inclination sensor causing the error. Yours reads .000. You have an auto and it uses this data to prevent vehicle rollback. If you have a steep hill nearby try stopping on the hill and let off the brake. The car should have the rear brake engaged and you feel it squat in the back a little. The system seems to sense the opening and closing just fine as the status changes appropriately.

http://wiki.ross-tech.com/wiki/index..._Parking_Brake This states the sensor is part of the parking brake control module.

Thats interesting that you mentioned that because the car rolls back on my driveway which has a ramp of about 30 degrees, but only on neutral. I believe on drive it holds its place when i let off the brake. I will confirm this theory tomorrow morning. I live on the island and not many steep hills in my area...id have to go out and find one to test this with the vagcom.

Thanks again Van. Id really hate to buy a 475 epb module if my epb is actually working. There doeant seem to be a way to reset this does it. Just test 07 then 06 and finally 010 in basic settings right?

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[van462]

I'd have to plug back in to look. The wiki mentioned doing a basic setting on the level switch. I assume it needs a way to verify what level is. The numbers may be different. A ramp on a parking garage might be steep enough to test on. I will try and test going from drive to b neutral and see if it maintsins brake lock... If I remember.

[nycaudi]

I'd have to plug back in to look. The wiki mentioned doing a basic setting on the level switch. I assume it needs a way to verify what level is. The numbers may be different. A ramp on a parking garage might be steep enough to test on. I will try and test going from drive to b neutral and see if it maintsins brake lock... If I remember.

The funny thing about all of this is that i had the brake pads and rotors upgraded last year around march with a usb - hex vagcom and a battery charger hooked up to the front terminals.
I had no errors for over a year. This epb error just happened last month and has been bugging the hell out of me ever since.

Thanks, i really appreciate your help!

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[van462]

If we are on the right track of it being the controller, then it would be an electrical fault that is independent of any mechanical work done. Also as its part of the controller vs an external switch or sensor its less likely a wiring or fuse problem, as the rest of the module is working. I doubt it has two separate voltage supplies. I don't have schematics for this car. But I would check over all the fuses (driver/passenger and trunk) before getting the module as it one of those troubleshooting steps that cost nothing.

[nycaudi]

If we are on the right track of it being the controller, then it would be an electrical fault that is independent of any mechanical work done. Also as its part of the controller vs an external switch or sensor its less likely a wiring or fuse problem, as the rest of the module is working. I doubt it has two separate voltage supplies. I don't have schematics for this car. But I would check over all the fuses (driver/passenger and trunk) before getting the module as it one of those troubleshooting steps that cost nothing.

Ok, got it. Ill see what i can dig up online, as far as what fuses relay power to the epb. Ill check them out and hopefully thats all it is, a blown fuse.

Ill report back here tomorrow at some point.

Thanks!

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[nycaudi]

Ok, got it. Ill see what i can dig up online, as far as what fuses relay power to the epb. Ill check them out and hopefully thats all it is, a blown fuse.

Ill report back here tomorrow at some point.

Thanks!

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Inclination sensor checks out. Pulled 2 fuses from trunk...when i placed them back after 15 seconds the epb made a clicking sound. Cleared codes and restarted whole process as if i was replacing rotors and pads again. I had the error go from both left and right low voltuge implausible...to left, to right, to abs and esp. I kept clearing codes, retesting epb and at one point it didnt come back for about 5 minutes. I turned off ignition, waited then turned ignitiin on and waited .....no error. Normally the epb light comes on after about 1 minute of ignition. Waited like 5 minutes. Started scan and boom it came back on right side only. Not sure what else to try right now other than buy a new epb.

I wonder if its the inclination sensor causing the error. Yours reads .000. You have an auto and it uses this data to prevent vehicle rollback. If you have a steep hill nearby try stopping on the hill and let off the brake. The car should have the rear brake engaged and you feel it squat in the back a little. The system seems to sense the opening and closing just fine as the status changes appropriately.

http://wiki.ross-tech.com/wiki/index..._Parking_Brake This states the sensor is part of the parking brake control module.

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[nycaudi]

Just wanted to update as i have resolved the issue.

First id like to thank the posts that provided troubleshooting information and advice. Those of you that provide help are invaluable to this forum, regardless of post count. To those that just like to post nonsene not related to topic.....well you guys need to find something better to do with your time.

So after swapping all fuses with new ones and buying a new battery and changing serial for said battery in module 19 through the vag.. i still had the same low voltage.

What i did afterwards, is i ordered the newest revision of the parking brake module. The part that i had was a "E" , tge latest module is revision "H".

I cleared codes with the vag and disconnected battery.
Swapped "E" module with the new "H" module.
Connected battery.
Configured time on mmi and turned ignition on and ran scans.
Cleared dtcs from disconnecting battery and ran scan again.
Shut down
Restarted and reran scan multiple times.

No more parking brake errors!