Abs/asr problem

[BukiTheOne]

hello guys,i'm a little stuck and can't sort out the abs.i get three beeps got a vcds and a full scan but can't find the cause of It. temporarily replaced the abs unit with the module with exact same number as mine to check if it will fix it but vcds could not communicate at all. so we swapped the abs unit again.i also have an aftermarket radio.
any help is greatly appreciated
here is the log of the vcds.

Chassis Type: 4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005)
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
75 76 77

Mileage: 264270km-164209miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 059-907-401-AKE.clb
Part No: 3B0 907 401
Component: 2 2.5l/4VT EDC G200AG D50
Coding: 03001
Shop #: WSC 16078
VCID: 5ABA1FCCC6CB9D9409-4B00

1 Fault Found
18259 - Powertrain Data Bus
P1851 - 35-10 - Missing Message from ABS Controller - Intermittent
Readiness: N/A

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: None
Part No: 4B0 927 156 B
Component: AG5 01V 2.5lTDI RdW 8915
Coding: 00000
Shop #: WSC 85555
VCID: 26427B3CC233E9747D-4B00

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-614-111-ASR.lbl
Part No: 8E0 614 111 H
Component: ABS/ASR 5.3 FRONT D10
Coding: 00011
Shop #: WSC 02325
VCID: 23446228B1011C5C1A-5100

3 Faults Found
18256 - Please check DTC Memory of Engine Controller
P1848 - 35-00 -
18263 - Powertrain Data Bus
P1855 - 35-00 - Software Version Monitoring
18258 - Powertrain Data Bus
P1850 - 35-00 - Missing Message from ECU

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 4B0-820-043-MY1.lbl
Part No: 4B0 820 043 G
Component: A6-Klimavollautomat D61
Coding: 00063
Shop #: WSC 16078
VCID: 1E3253DC9A6331B435-2580

1 Fault Found
01809 - Actuating Motor for Temperature Flap; Left (V158)
41-10 - Blocked or No Voltage - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 4B0-959-655-AI7.lbl
Part No: 4B0 959 655 J
Component: Airbag 7 Audi 0501
Coding: 00106
Shop #: WSC 02324
VCID: 377CA678159960FCD6-51C0

1 Fault Found
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4B0-919-xxx-17.lbl
Part No: 4B0 919 880 G
Component: C5-KOMBIINSTR. VDO D08
Coding: 00160
Shop #: WSC 00000
VCID: 306E9D64F0F7B7C497-5180

Subsystem 1 - Part No: IMMO
Component: IDENTNR: AUZ7Z0W0539418
IMMO-IDENTNR: AUZ7Z0W0539418

1 Fault Found
01176 - Key
07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 35: Centr. Locks Labels:
VCID: 55A00CF0ACD5B2EC24-FFFE

[kid]

Have you checked the wire harness?

[chris86vw]

I'd check the can wires between the abs module and ecu.

These cars use CAN for module to module communication but K line from the port to the modules.

Since you could communicate to the original module but the faults are for missing powertrain databus signals that is where you should probably start to look.


The second module not having any communication is a bit weird, but if you reinstall the first and regain diagnostic function of the ABS module then it would point to second module being defective, first one could be too but leave it in for testing the wires. Aftermarket radio shouldn't cause problems, in that if ecu and trans are talking it doesn't seem the radio is the problem, and the normal problem is shorting the radio to the k line, which seems fine.

[BukiTheOne]

All right guys,thanks a lot for the advise.i'll find a good electrician and ask him to test the wires one by one.i hope it is the wire harness.it's been many months it's been bothering me and wasted too much time.almost gave up and wanted to sell it.I will be posting again soon

[DreamInRotary]

If it makes you feel any better my ABS module is throwing so many codes I have Christmas lights on my dash 24/7. I'll follow the thread to see what you find out

[kid]

If it makes you feel any better my ABS module is throwing so many codes I have Christmas lights on my dash 24/7. I'll follow the thread to see what you find out

On the bright side, your gauges all work, and you're getting decent mileage.

[julex]

I looks to me like you have an ABS module in the car that is loaded with either older or newer version of software than the car originally came with and that version of software is expecting a different ECU software version. This could be the reason for the software version issue and inability to properly communicate with ECU because the protocol might be slightly different.

I see that the version of the ABS software is D10, while the one on my 2001 allroad is D47 and most of Audi S4 from 2000 have D46 version. Although you appear to have front wheel drive car? It sounds like your version is really old. Are you 100% sure that this D10 was operating properly before the failure or you inherited the issue with ABS from previous owner?

Anyway, post what exact car you have too so maybe parts lookup can shed some light on this.

Also... when you say that you swapped the the module, are you talking about just the pump module and/or the one under the passenger side carpet? The one under the carpet is responsible for communications and management of abs/esr/esp etc functions.

[BukiTheOne]

hi julex thanks for your reply
it is a front wheel drive audi a6 2.5 tdi produced in 1998
we bought this car second hand a year ago,me and two other friends drove it together to test it and there weren't any beeps for the abs.it surely had some problems with the wiring
in the comfort control module under the carpet of the driver but we fixed that and i also removed the rubber grommets under the battery and near ECU for the water leaks which are 99% the cause
of a big headache and the electronics. i know this because prior i have owned an audi a4 which was leaking water inside because of the clogged grommets.

when we swapped the abs unit meaning the abs pump and the module together which is near the engine under the hood.plugged my vcds and couldn't establish communication with abs

[mrlibrary03]

I randomly get an ABS errors as well. The weird/scary thing is when this happens my tail/brake lights go out and stop working! Seemed to happen more frequently when I use the fog lights, so guess what, I don’t use the fog lights anymore. Anyone else experience this? I’ll be interested to see how this thread plays out.


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[beardman]

I had a similar problem, as strange as it sounds, try a throttle body alignment through vcds. I did this on a whim from when I had a throttle body issue.

After that completes, clear all the codes and see if that works.


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[BukiTheOne]

You cannot perform a throttle body alignment on a diesel engine

[beardman]

Sorry, missed that part.


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[BukiTheOne]

Just wanted to give you guys a quick update,hence my abs problem is now finally fixed. as you can see from my first post, i had some other errors which i have always ignored (dont know why).as strange as it may sound it turned out that the airbag warning light has somehow interfered with the proper functioning of the abs. Once i cleared the airbag code and then cleared the abs code and the errors didnt appear again and the abs magicaly started to work.i should have done that long ago but anyway thats my story and thanks to all for your suggestions.i hope it can be of help to others as well. So make sure you enter each module separately and clear all the silly codes with vag com