Multiple faults with Comfort Databus

[tazzz78]

Hi all
I am new owner of A8L (D3 2006) and have just scanned it for faults. it came back with multiple faults for combination comfort databus. I am aware of a fault with driver power electric door closure, but did not expect this amount of faults. Everything else work ok. I understand that maybe just one of the modules might be throwing all of them as they all sit on a bus. Any ideas where to start?
Logs below.
Address 08: Auto HVAC Labels: None
Part No SW: 4E0 910 043 B HW: 4E0 820 043 G
Component: KLIMAAUTOMAT 017 0450
Revision: 00000032 Serial number: 00000000093086
Coding: 0084081
Shop #: WSC 02311 785 00200
VCID: 1C3C5186A6C3

4 Faults Found:
00470 - Combination comfort Databus in Single Wire
012 - Electrical Fault in Circuit
Freeze Frame:
Fault Status: 01101100
Fault Priority: 3
Fault Frequency: 4
Reset counter: 251
Mileage: 260417 km
Time Indication: 0
Date: 2011.03.19
Time: 11:24:59

Freeze Frame:
ON

00066 - Right Rear Footwell Heater (Z43)
012 - Electrical Fault in Circuit
Freeze Frame:
Fault Status: 01101100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 250
Mileage: 260417 km
Time Indication: 0
Date: 2011.03.19
Time: 11:25:03

Freeze Frame:
Voltage: 13.50 V

00065 - Left Rear Footwell Heater (Z42)
012 - Electrical Fault in Circuit - Intermittent
Freeze Frame:
Fault Status: 00101100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 35
Mileage: 260417 km
Time Indication: 0
Date: 2011.03.19
Time: 11:25:49

Freeze Frame:
Voltage: 13.50 V

00565 - Rear A/C Control Head (Climatronic) (E265)
013 - Check DTC Memory
Freeze Frame:
Fault Status: 00000100
Fault Priority: 5
Fault Frequency: 2
Reset counter: 24
Mileage: 0 km
Time Indication: 0

Freeze Frame:
OFF

Address 09: Cent. Elect. Labels: 4E0-910-279.lbl
Part No SW: 4E0 910 279 Q HW: 4E2 955 113 B
Component: ILM Fahrer H14 0230
Coding: 0143121
Shop #: WSC 02313 785 00200
VCID: 3668A32E382F

Part No: 4E2 910 113 B
Component: Wischer WWS D3 H50 0420
Coding: 00000037
Shop #: WSC 02313

Part No: 4E0 910 557 A
Component: REGENLICHTSENSORH12 0090
Coding: 00139548
Shop #: WSC 02313

1 Fault Found:
01336 - Data Bus for Comfort System
013 - Check DTC Memory
Freeze Frame:
Fault Status: 01101101
Fault Priority: 2
Fault Frequency: 247
Reset counter: 251
Mileage: 243834 km
Time Indication: 0
Date: 2010.10.20
Time: 17:32:10
Address 19: CAN Gateway Labels: 4E0-910-468.lbl
Part No SW: 4E0 910 468 B HW: 4E0 907 468 E
Component: Gateway H11 0090
Revision: 11 Serial number: 20003063118031
Coding: FCFF7FDE2B7504
Shop #: WSC 02313 785 00200
VCID: 27567E6AEF85

1 Fault Found:
00470 - Combination comfort Databus in Single Wire
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 3
Fault Frequency: 12
Reset counter: 252
Mileage: 260417 km
Time Indication: 0
Date: 2011.03.19
Time: 11:25:52

Address 1D: Driver Ident. Labels: 4E0-910-218.lbl
Part No SW: 4E0 910 218 A HW: 4E2 905 218 B
Component: FPI_1 H01 0010
Revision: 01000101 Serial number: 05122005103246
Shop #: WSC 00000 000 00000
VCID: 1F46668AB7D5

1 Fault Found:
01336 - Data Bus for Comfort System
012 - Electrical Fault in Circuit
Freeze Frame:
Fault Status: 01101100
Fault Priority: 7
Fault Frequency: 2
Reset counter: 251
Mileage: 260416 km
Time Indication: 0
Date: 2011.03.19
Time: 13:42:28
Address 28: HVAC, Rear Labels: None
Part No SW: 4E0 910 158 HW: 4E0 919 158 D
Component: KLIMA-STG. FOND 017 0230
Revision: 00000019 Serial number: 00000000051426
Coding: 0000000
Shop #: WSC 00000 000 00000
VCID: E1C2A0724121

4 Faults Found:
01087 - Basic Setting Not Performed
005 - No or Incorrect Basic Setting / Adaptation
01863 - Air Outlet Motor; Left Rear (V218)
003 - Mechanical Failure
01864 - Air Outlet Motor; Right Rear (V219)
003 - Mechanical Failure
00470 - Combination comfort Databus in Single Wire
012 - Electrical Fault in Circuit

Address 42: Door Elect, Driver Labels: None
Part No SW: 4E1 910 802 B HW: 4E2 959 802 B
Component: T¸rsteuer.FS BRM003 0100
Coding: 0032750
Shop #: WSC 00000 785 00200
VCID: 204465768AAB

1 Fault Found:
00470 - Combination comfort Databus in Single Wire
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 2
Fault Frequency: 0
Reset counter: 252
Mileage: 260416 km
Time Indication: 0
Date: 2011.03.19
Time: 16:56:58


-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 4E0-910-289.lbl
Part No SW: 4E0 910 289 B HW: 4E0 907 289
Component: Komfortgeraet H05 0010
Revision: 00100005 Serial number: W040603090368
Coding: 0004829
Shop #: WSC 02313 785 00200
VCID: 28547D56E29B

Part No: 4E0 907 719
Component: Neigungssensor H05 0020

1 Fault Found:
00985 - Right Tail Light (M2)
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 3
Fault Frequency: 14
Reset counter: 36
Mileage: 260420 km
Time Indication: 0
Date: 2011.03.19
Time: 13:49:02
Address 52: Door Elect, Pass. Labels: None
Part No SW: 4E1 910 802 B HW: 4E2 959 801 B
Component: T¸rsteuer.BF BRM003 0100
Coding: 0032750
Shop #: WSC 00000 785 00200
VCID: 204465768AAB

1 Fault Found:
00470 - Combination comfort Databus in Single Wire
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 2
Fault Frequency: 0
Reset counter: 252
Mileage: 260416 km
Time Indication: 0
Date: 2011.03.19
Time: 16:56:58
Address 62: Door, Rear Left Labels: 4E0-910-802.lbl
Part No SW: 4E0 910 802 A HW: 4E0 959 801 C
Component: T¸rsteuer.HL BRM003 0100
Coding: 0032750
Shop #: WSC 00000 785 00200
VCID: 1E385B8EB0DF

1 Fault Found:
00470 - Combination comfort Databus in Single Wire
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 2
Fault Frequency: 0
Reset counter: 252
Mileage: 260416 km
Time Indication: 0
Date: 2011.03.19
Time: 16:56:58

Address 72: Door, Rear Right Labels: 4E0-910-802.lbl
Part No SW: 4E0 910 802 A HW: 4E0 959 802 C
Component: T¸rsteuer.HR BRM003 0100
Coding: 0032750
Shop #: WSC 00000 785 00200
VCID: 1E385B8EB0DF

1 Fault Found:
00470 - Combination comfort Databus in Single Wire
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 2
Fault Frequency: 0
Reset counter: 252
Mileage: 260416 km
Time Indication: 0
Date: 2011.03.19
Time: 16:56:58

[a8 tech]

go into address 17 or 19 and check the bus network status, normally mvb 125 you may find the info in the vcds label files
1 = comms ok 0= not ok then scope the dash can wires for to check for open circuit short to +/-
the info points to a defect on the wiring to the dash or the dash itself

[tazzz78]

Thanks for very quick answer. Excuse me, but I ma not sure i follow you 100%. I have gone into 17 - no faults. 19 show this:

Address 19: CAN Gateway Labels: 4E0-910-468.LBL
Control Module Part Number: 4E0 910 468 B HW: 4E0 907 468 E
Component and/or Version: Gateway H11 0090
Software Coding: FCFF7FDE2B7504
Work Shop Code: WSC 02313 785 00200
VCID: 27567E6AEF85
1 Fault Found:
00470 - Combination comfort Databus in Single Wire
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 3
Fault Frequency: 14
Reset counter: 253
Mileage: 260417 km
Time Indication: 0
Date: 2011.03.19
Time: 11:25:52

What do you mean by scope the dash wires? Physical test with multimeter?

[a8 tech]

if you access the measured value function in this address then enter block 125 this will show all the bus drives and hopefully show you if the bus coms are down from the dash
to scope would mean to tap into the dash canbus wires and use a oscilloscope to check both high and low signals are present
if only one is present then check the wire for open circuit

because rosstech removed the label files from wiki i cant check the measured values for you

each bus circuit has two wires

can high and can low

they are a mirror image signal so if one fails it goes into single wire mode to keep the network functioning, there are can nodes which you can tap into to check both signals are present

you can check with a multi meter but you must disconnect the individual circuit for a resistance check if you do not then you will pick resistance up as each consumer has a end stage so you must disconnect to check in the more conventional ohms check

[tazzz78]

In 19 adv meas value are grayed out. Block 125 shows as below.



Address 19: CAN Gateway (4E0 910 468 B)

19:34:22 Group 125
Engine 1
Transm. 1
ABS Slp.Ind
Instruments 1
Saturday,19,March,2011,19:45:52:60804


I think i understand the idea of a bus. interesting to find out they are doubled up. I think I it is above my ability to fault find this. you are talking about wiring, wouldn't a module failure cause the same issue? it used to happen in my old days of alarm fault finding (house alarms).
Anyone more experienced in the south to try to tackle this?

[a8 tech]

yes the dash module could be the cause but as long as one can wire is present then the dash will function
clear the faults and try again in a few days, if there is still a single wire fault then it would be advisable to have it checked out but the funny thing is the faults only started today with low frequency of occurrence

the drivers door has a dash wake up wire, this turns the dash on when you open the door
this may well be related to your power closure issue and can problem

Address 42: Door Elect, Driver Labels: None
Part No SW: 4E1 910 802 B HW: 4E2 959 802 B
Component: T¸rsteuer.FS BRM003 0100
Coding: 0032750
Shop #: WSC 00000 785 00200
VCID: 204465768AAB

1 Fault Found:
00470 - Combination comfort Databus in Single Wire
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 2
Fault Frequency: 0
Reset counter: 252
Mileage: 260416 km
Time Indication: 0
Date: 2011.03.19
Time: 16:56:58

[tazzz78]

ok thanks,
fault shows as it have started today following me clearing all the faults. (it was there before as well). I will take the door apart probably next weekend, and check whats going on. I will probably then disconnect the module in the door to check if it would clear the fault.
Thanks for your help.