2010 Audi Q7 TDI (RoW) - Need guidance for CAN BUS wire troubleshooting

   #1  

jmjq7tdi

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Hello all,
I need guidance for troubleshooting a CAN BUS wire short on my 2010 Audi Q7 TDI. It has a lot of options, so there are quite a few electronics. Can someone please advise me of the recommended troubleshooting procedure, resources (i.e. diagrams and list of cable runs to be checked) as well as any way to isolate the specific area where it's broken? Here's the section of code reporting the CAN bus problem:

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533) Labels:. 4F0-907-468.clb
Part No SW: 4F0 907 468 N HW: 4F0 907 468 G
Component: GW-BEM 5CAN-M H06 0035
Revision: MB200030 Serial number: 3000M098308025
Coding: 000303
Shop #: WSC 31414 790 00001
VCID: 3A7B33FBB59CB59416-806E

Subsystem 1 - Part No SW: 8K0 915 181 D HW: 8K0 915 181 D
Component: J367-BDM H07 0107
Serial number: 00000000004140159397

1 Fault Found:
00470 - Company Comfort Databus in Single Wire
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 3
Fault Frequency: 1
Reset counter: 249
Mileage: 115825 km
Time Indication: 0
Date: 2018.04.05
Time: 23:04:26

Freeze Frame:
Bin. Bits: 10111
Voltage: 12.00 V
Count: 7
Bin. Bits: 10011
 
   #2  

PetrolDave

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I would suggest going to erWin and paying for a 1 hour subscription so you can download the WD for your Q7 (and all the other relevant documents while you're there :thumbs:), that will show you where the Comfort Databus is connected to and through which connectors.
 
   #3  

mattylondon

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Hi,

Usually you see the same fault code in another module, more than likely a door module. If not, the fault is between the Gateway and a CAN connecting block. Please post a full scan so we can see. The Q7 has a 46-pin CAN connecting block each side of the dash below the fuses. The below is from an A8, but it's similar. Lastly, do as Dave says and get the WD. :thumbs:

 
Last edited:
   #5  

jmjq7tdi

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My apologies. The last full auto scan is as follows:

Code:
Thursday,05,April,2018,23:16:29:49964
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 18.2.0.3 (x64)
Data version: 20180212 DS287.0
www.Ross-Tech.com


VIN: WAUZZZ4L3AD015721xxxxx   License Plate: 
Mileage: 115820km-71967mi   Repair Order: 


Chassis Type: 4L (4F0)
Scan: 01 02 03 05 08 09 13 15 16 17 18 19 20 28 34 36 3C 42 46 47
          4F 52 55 56 5F 62 69 6C 6D 6F 72 76

VIN: WAUZZZ4L3AD0xxxxx   Mileage: 115820km-71967miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
13-Auto Dist. Reg -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
18-Aux. Heat -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
20-High Beam Assist. -- Status: OK 0000
28-HVAC, Rear -- Status: OK 0000
34-Level Control -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
3C-Lane Change -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
4F-Centr. Electr. II -- Status: OK 0000
52-Door Elect, Pass. -- Status: Malfunction 0010
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
5F-Information Electr. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
69-Trailer -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
6D-Trunk Elect. -- Status: OK 0000
6F-Centr. Conv. II -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000
 
-------------------------------------------------------------------------------
Address 01: Engine (CAS)       Labels:. 059-907-401-CAT1.clb
   Part No SW: 4L1 910 401 D    HW: 4L0 907 401 A
   Component: 3.0TDI EDC17A104AG  0080  
   Revision: --H02---    Serial number:               
   Coding: 0121002C191F0A68
   Shop #: WSC 40970 222 94360
   VCID: 2447ED83E718D3645C-8070

No fault code found.
Readiness: 0 0 0 0 1 

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09D-927-750.lbl
   Part No SW: 09D 927 750 KC    HW: 09D 927 750 KC
   Component: AL 750 6A           1470  
   Revision: 00H78000    Serial number:               
   Coding: 0000504
   Shop #: WSC 31414 790 00001
   VCID: 79F9ECF7301A7E8C5F-802C

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels:. 4L0-910-517-V2.clb
   Part No SW: 4L0 910 517 K    HW: 4L0 614 517 K
   Component: ESP ALLRAD MK25E1   0020  
   Revision: 00H30001    
   Coding: 0627841
   Shop #: WSC 31414 790 00001
   VCID: 326B1BDBADEC4DD4DE-8066

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth.        Labels:. 4F0-910-852.clb
   Part No SW: 4F0 910 852 B    HW: 4F0 905 852 D
   Component: FBSAUDIC6 ELV   H05 0100  
   Revision: 00H05000    Serial number: 10602601405096
   Coding: 0000135
   Shop #: WSC 31414 790 00001
   VCID: 2541F087EC222A6C4B-8070

   Subsystem 1 - Part No: 4F0 910 132 G
   Component: FBSAUDIC6 EZS   H03 0020

   Subsystem 2 - Part No: 4F0 910 335 B
   Component: FBSAUDIC6 KSG   H03 0020

   Subsystem 3 - Part No: 4F0 910 220 K
   Component: FBSAUDIC6 IDG   H01 0040

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels: None
   Part No SW: 4L0 910 043 C    HW: 4L0 820 043 AB
   Component: KLIMA 4 ZONEN H12 0030  
   Revision: 00---017    Serial number: 00000000212367
   Coding: 040816
   Shop #: WSC 31414 790 00001
   VCID: 2447ED832718D3645C-8070

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 4F0-910-279.lbl
   Part No SW: 4F0 910 279 R    HW: 4F0 907 279 
   Component: ILM Fahrer      H25 0330  
   Revision: 00000000    Serial number: 4F0907279     
   Coding: 0033221
   Shop #: WSC 31414 790 00001
   VCID: 387F29F34B90A784E0-806C

   Subsystem 1 - Part No: 4L1 910 113   Labels: 1KX-955-119.CLB
   Component: Wischer AU716   H17 0100  
   Coding: 00064792
   Shop #: WSC 31414  

   Subsystem 2 - Part No: 8K0 910 557   Labels: 8K0-955-559.CLB
   Component: REGENLICHTSENSORH04 0003  
   Coding: 00150059
   Shop #: WSC 31414  

No fault code found.

-------------------------------------------------------------------------------
Address 13: Auto Dist. Reg        Labels: None
   Part No SW: 4L0 910 561 A    HW: 4L0 907 561 
   Component: ABSTANDSREGELUNGH06 0160  
   Revision: --------    Serial number: 00000000000000
   Coding: 0031161
   Shop #: WSC 31414 790 00001
   VCID: 275DFA8F962E387C79-8072

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4L0-910-655.lbl
   Part No SW: 4L0 910 655 D    HW: 4L0 959 655 C
   Component: 70 AIRBAG AUDI8RH43 0230  
   Revision: 04H43000    Serial number: 00399D065B3G  
   Coding: 0014128
   Shop #: WSC 31414 790 00001
   VCID: 2E530FABB9D46934BA-807A

   Subsystem 1 - Serial number: 6332QSME623A191AH

   Subsystem 2 - Serial number: 6342QSME703A32067

   Subsystem 3 - Serial number: 6352QSME4338322CE

   Subsystem 4 - Serial number: 6362QSME623A143AH

   Subsystem 5 - Serial number: 63734SME3136050EX

   Subsystem 6 - Serial number: 63834SME2F364400-

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 4F0-910-549.lbl
   Part No SW: 4F0 910 549 A    HW: 4F0 953 549 D
   Component: J0527               0530  
   Revision: 00H05000    Serial number: 90026092380094
   Coding: 0002052
   Shop #: WSC 31414 790 00001
   VCID: 275DFA8F962E387C79-8072

   Subsystem 1 - Part No: XXXXXXXXXXX 
   Component: E0221           H02 0030

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:. 4L0-920-xxx-17.clb
   Part No SW: 4L0 920 931 J    HW: 4L0 920 931 J
   Component: KOMBIINSTR.   H08 0144  
   Revision: 00000000    Serial number: CNN432799     
   Coding: 0F5663040C010008000000
   Shop #: WSC 31414 790 00001
   VCID: 326B1BDB6DEC4DD4DE-8066

No fault code found.

-------------------------------------------------------------------------------
Address 18: Aux. Heat        Labels: None
   Part No SW: 4L0 910 105     HW: 4L0 265 105 M
   Component: Heizgeraet      H08 0120  
   Revision: 0000000E    Serial number: 00000009014264
   Coding: 0000101
   Shop #: WSC 31414 790 00001
   VCID: 60CFA193B3808F4478-8034

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 4F0-907-468.clb
   Part No SW: 4F0 907 468 N    HW: 4F0 907 468 G
   Component: GW-BEM 5CAN-M H06 0035  
   Revision: MB200030    Serial number: 3000M098308025
   Coding: 000303
   Shop #: WSC 31414 790 00001
   VCID: 3A7B33FBB59CB59416-806E

   Subsystem 1 - Part No SW: 8K0 915 181 D    HW: 8K0 915 181 D
   Component: J367-BDM  H07 0107 
   Serial number: 00000000004140159397

1 Fault Found:
00470 - Company Comfort Databus in Single Wire 
            011 - Open Circuit
             Freeze Frame:
                    Fault Status: 01101011
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 249
                    Mileage: 115825 km
                    Time Indication: 0
                    Date: 2018.04.05
                    Time: 23:04:26

             Freeze Frame:
                    Bin. Bits:    10111
                    Voltage: 12.00 V
                    Count: 7
                    Bin. Bits:    10011


-------------------------------------------------------------------------------
Address 20: High Beam Assist. (J844)       Labels:. 8K0-857-511.clb
   Part No SW: 4F0 857 511 J    HW: 4F0 857 511 G
   Component: FLA           H04 0004  
   Revision: AA001002    
   Coding: 02019064747464545425363E
   Shop #: WSC 31414 790 00001
   VCID: 2F6D12AF7EDE603CB1-807A

No fault code found.

-------------------------------------------------------------------------------
Address 28: HVAC, Rear        Labels: None
   Part No SW: 4L0 910 158     HW: 4L0 919 158 AB
   Component: KLIMABETAETIGUNGH06 0060  
   Revision: 00---010    Serial number: 00000000352325
   Coding: 0000006
   Shop #: WSC 31414 790 00001
   VCID: 68DFB9B35BB0F704B0-803C

No fault code found.

-------------------------------------------------------------------------------
Address 34: Level Control        Labels: None
   Part No SW: 4L0 910 553 H    HW: 4L0 907 553 
   Component: LUFTFDR.-CDC    H03 7870  
   Revision: --H03001    Serial number: 15.1528-0123.2
   Coding: 0015520
   Shop #: WSC 31414 790 00001
   VCID: 2F6D12AFBEDE603CB1-807A

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr (J136)       Labels: None
   Part No SW: 4F0 959 760 C    HW: 4F0 959 760 C
   Component: MEM-FS        H08 0062  
   Revision: AA000000    Serial number: 00001001346979
   Coding: 00581B00000011110000
   Shop #: WSC 31414 790 00001
   VCID: 316914D768EA76CCA7-8064

No fault code found.

-------------------------------------------------------------------------------
Address 3C: Lane Change        Labels: None
   Part No SW: 4L0 910 566 C    HW: 4L0 907 566 B
   Component: J0769_SWA_MasterH01 0040  
   Revision: 00H01000    Serial number: 6PZ 009 014-10
   Coding: 0010101
   Shop #: WSC 31414 790 00001
   VCID: 2E530FABB9D46934BA-807A

   Subsystem 1 - Part No: 4L0 910 568 C
   Component: J0770_SWA_Slave_H01 0040

   Subsystem 2 - Serial number: 6PZ 009 014-30

   Subsystem 3 - Serial number: 5F21.07.0900H010003C910745ÿ

   Subsystem 4 - Serial number: 910745ÿ

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels:. 4F0-959-793.clb
   Part No SW: 4F0 959 793 R    HW: 8K0 959 793 D
   Component: TSG FA        H11 0250  
   Revision:             Serial number: 0000101820752 
   Coding: 011F52205E40440004
   Shop #: WSC 31414 790 00001
   VCID: 4683570BF164C17462-8012

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 4L0-910-289.lbl
   Part No SW: 4L0 910 289 H    HW: 4L0 907 289 H
   Component: Komfortgeraet   H09 0100  
   Revision: 0100 ---    Serial number: 01219373360000
   Coding: 3547377
   Shop #: WSC 31414 790 00001
   VCID: 356120C75C825AECFB-8060

   Subsystem 1 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HORN H03 1301

   Subsystem 2 - Part No: 4F0 910 177 
   Component: Innenraumueberw.H01 0020

No fault code found.

-------------------------------------------------------------------------------
Address 47: Sound System (J525)       Labels: Redir Fail!
   Part No SW: 4L0 035 223 E    HW: 4L0 035 223 E
   Component: BOSE G3 AU716 H01 0100  
   Revision: AH001500    Serial number: 00000000008395
   Coding: 0D000000
   Shop #: WSC 31414 790 00001
   VCID: 2447ED832718D3645C-8070

No fault code found.

-------------------------------------------------------------------------------
Address 4F: Centr. Electr. II        Labels: 4F0-910-280.lbl
   Part No SW: 4F0 910 280     HW: 4F0 907 280 E
   Component: ILM Beifahrer   H13 0100  
   Revision:             Serial number: 00000000139275
   Coding: 0011101
   Shop #: WSC 31414 790 00001
   VCID: 5EB39F6B89F4B9B44A-800A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels:. 4F0-959-792.clb
   Part No SW: 4F0 959 792 R    HW: 8K0 959 792 D
   Component: TSG BF        H11 0250  
   Revision:             Serial number: 0000101847220 
   Coding: 011F52205E40440004
   Shop #: WSC 31414 790 00001
   VCID: 45815007CC62CA6C6B-8010

1 Fault Found:
02126 - Central Locking Button; Exterior Door Handle 
            008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 249
                    Mileage: 115825 km
                    Time Indication: 0
                    Date: 2018.04.05
                    Time: 23:05:32


-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4F0-910-357.lbl
   Part No SW: 4L0 910 357 A    HW: 4L0 907 357 A
   Component: AFS 1           H01 0030  
   Revision: 00000001    Serial number:               
   Coding: 0000032
   Shop #: WSC 31414 790 00001
   VCID: 2A5B03BB853C051466-807E

   Subsystem 1 - Part No: 7L6 941 329 A
   Component: AFS-Modul links H07 0004

   Subsystem 2 - Part No: 7L6 941 329 A
   Component: AFS-Modul rechtsH07 0004

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (R)       Labels: Redir Fail!
   Part No SW: 4F0 035 053 B    HW: 4F0 035 053 
   Component: Radio U Basic H45 0020  
   Revision: AB001007    Serial number: 341IZ097634851
   Coding: 010003010000000000
   Shop #: WSC 31414 790 00001
   VCID: 1C37D5631F68EBA4E4-8048

No fault code found.

-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:. 4E0-035-6xx-5F.clb
   Part No SW: 4L0 035 670     HW: 4L0 035 670 
   Component: H-BNT-EU      H41 0047  
   Revision: --------    Serial number: 474I6097515869
   Coding: 010100060004DBEF71000315EF6300030000
   Shop #: WSC 31414 790 00001
   VCID: 65C1B0876CA2EA6C8B-8030

   Subsystem 1 - Part No: 8R0 060 884 E
   Component: EUR 2009/2010  5805 

   Subsystem 2 - Part No SW: 4F0 919 604     HW: 4F0 919 604 
   Component: DU7 High  H43 0306 
   Serial number: 9356IZ091064728     

   Subsystem 3 - Part No SW: 4L0 910 609     HW: 4L0 919 611 C
   Component: E0380 Bedient  H05 0060 
   Serial number: 00000001400099      

   Subsystem 4 - Part No: 8R0 906 961 A
   Component:   CD-Database  1293 

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388)       Labels:. 4F0-959-795.clb
   Part No SW: 4F0 959 795 M    HW: 8K0 959 795 B
   Component: TSG HL        H10 0251  
   Revision:             Serial number: 0000101862201 
   Coding: 010E50204040230004
   Shop #: WSC 31414 790 00001
   VCID: 43854E1FC256F45C45-8016

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer (J345)       Labels:. 4E0-907-383.clb
   Part No SW: 4E0 907 383 J    HW: 4E0 907 383 J
   Component: Anhaenger     H09 0100  
   Revision: 2A001001    Serial number: 00008200327685
   Coding: 0100000000000000
   Shop #: WSC 80093 222 69422
   VCID: 316914D768EA76CCA7-8064

No fault code found.

-------------------------------------------------------------------------------
Address 6C: Back-up Cam.        Labels: 4L0-910-441.clb
   Part No SW: 4L0 910 441 B    HW: 4L0 907 441 B
   Component: J772__Rearview      0030  
   Revision: --H03---    Serial number: 525PA8-J9940CA
   Coding: 1021001
   Shop #: WSC 31414 790 00001
   VCID: 2541F087EC222A6C4B-8070

No fault code found.

-------------------------------------------------------------------------------
Address 6D: Trunk Elect.        Labels: None
   Part No SW: 4L0 910 945     HW: 4L0 827 851 D
   Component: ValeoHeckdeckel H29 0410  
   Revision: --H29001    Serial number: 8K9827852  B  
   Shop #: WSC 98765 666 38354
   VCID: 6CD7C5A34F48DB24D4-8038

   Subsystem 1 - Part No: 4L0 910 946 
   Component: ValeoHeckdeckel H29 0410

   Subsystem 2 - Serial number: E5030100B     

   Subsystem 3 - Serial number: RD16.09.09--H29001001A0322ÿ

   Subsystem 4 - Serial number: 1A0322ÿ

No fault code found.

-------------------------------------------------------------------------------
Address 6F: Centr. Conv. II        Labels:. 4L0-910-290.lbl
   Part No SW: 4L0 910 290 A    HW: 4L0 907 290 A
   Component: ILM HINTEN 2    H05 0060  
   Revision: AAH05061    Serial number: 003881240-----
   Coding: 0003587
   Shop #: WSC 31414 790 00001
   VCID: 2643F78B9124217442-8072

   Subsystem 1 - Part No: 4L0 910 591 
   Component: J_245_EE16_SKB09H10 0200

   Subsystem 2 - Part No: 4L0 910 591 
   Component: J_394_EE16_SKB09H10 0200

   Subsystem 3 - Part No: 4L0 910 591 
   Component: J_392_EE16_SKB09H10 0200

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389)       Labels:. 4F0-959-795.clb
   Part No SW: 4F0 959 795 M    HW: 8K0 959 795 B
   Component: TSG HR        H10 0251  
   Revision:             Serial number: 0000101862200 
   Coding: 010E50204040230004
   Shop #: WSC 31414 790 00001
   VCID: 43854E1FC256F45C45-8016

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 4Fx-910-283.lbl
   Part No SW: 4L0 910 283 E    HW: 4L0 919 283 E
   Component: Parkhilfe 8-Kan H02 0100  
   Revision: 00H02000    Serial number: 85130925303084
   Coding: 0231166
   Shop #: WSC 31414 790 00001
   VCID: 2C5705A38FC81B2494-8078

No fault code found.

End-------------------------(Elapsed Time: 03:38)--------------------------
 
   #6  

Jack@European_Parts

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1 Fault Found:
00470 - Company Comfort Databus in Single Wire
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 3
Fault Frequency: 1
Reset counter: 249
Mileage: 115825 km
Time Indication: 0
Date: 2018.04.05
Time: 23:04:26

Freeze Frame:
Bin. Bits: 10111
Voltage: 12.00 V <<<<<<<<<<<<<<<<<<<<<<<<<<< HMMMMM
Count: 7
Bin. Bits: 10011
Change battery fix door handle maybe after but check modules for water ingress!

Q7 is a POS for water damage!

Clear codes see what comes back.
 
   #7  

jmjq7tdi

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Is there any way to see in the computer when the battery was last changed? The scan you see above from 5 April was after clearing the codes (and after completing some towing-related programming that had never been done, which cleared up a few other issues for me). If not, and if I do still have the original battery, would I be able to tell with a visual inspection? My previous Q7, a 2009 TDI (US spec) that I ordered new (and sold back to Audi in December 2017), was delivered in May 2009 and the original battery lasted until mid-2017 (despite sitting through three overseas shipments for various moves). I suppose I might be at the same point with this 2010 Q7.

I've read that having one broken CAN bus wire can prevent the vehicle from going to sleep and cause excessive battery drain, which might be the reason for lower voltage. I've enabled the battery level display and I'm going to continue checking it each time I go out. Initially, it was only about 60%, but that was probably just because I spent about two hours trying to complete the coding for several modules related to towing. Every other time I've checked it, it read 100%. I'll get another scan this afternoon and see if the voltage reading improves.

As far as moisture, I have not discovered any problems anywhere (yet). Everything looks immaculate. No accumulation of leaves or debris anywhere, no external signs of corrosion. I don't know where all of the modules are in the Q7, but I'll keep looking.

FYI, I have opened up the passenger door to see if there was anything unusual.
1) The first thing I noticed is that a screw was missing. Only three screws were securing the interior panel instead of four. The missing screw was behind the horizontal trim piece.
2) A big piece of foam that is supposed to be suspended at the top around the door handle had come loose and was laying in the bottom of the door. It's strange that it never caused a problem with operating the windows, but somehow it didn't. I put some additional adhesive on it, clipped it in place with the vertical metal clip coming down, and it's stayed in position so far.
3) Everything else looked good. I disconnected and reconnected the connector for the door handle, contacts look good. Everything inside the door looks reasonably clean, no signs of moisture or corrosion.

What parts are required to fix the door handle button? Keyless entry still works all around, but none of the handle buttons work (as far as I know, at least none of them lock the vehicle). Do you think it's a case of the whole locking system being disabled if one button is bad?

Thanks for the suggestions on erWIN. When I have a full hour to sit and download documents, I'll definitely do that.
 
   #10  

mattylondon

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Check Comfort CAN wires to gateway. Can connecting block left hand side, 14H & 14L to pins 15 (CAN-H) & 5 (CAN-L) on the gateway. I just have a hunch that's where the open circuit is.
 
   #11  

jmjq7tdi

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This is my first time trying to perform any CAN bus troubleshooting, so I'm at the ground/newbie level here. Can you please provide some guidance to properly inspect this? At this point, I only know how to find the CAN connecting block on each side. It appears that the back of it has a bunch of wires wrapped in black. The front of the connector has a simple cap that doesn't really tell me much. What's the proper way to go about this? Do I need to remove any trim pieces under the console to get a good look at it?
 
   #12  

mattylondon

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Essentially it is testing the wire for continuity from 14H at the CAN Block (left side) to pin15 at the gateway plug, a simple multimeter will do. Then repeat with 14L to pin5. You'll have to remove the trim below the dash panel to gain access to the gateway (I don't own a Q7 so just now read that in Elsa) and remove the cap off the CAN block as below. There will be tiny markings to identify the pins.

 
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mattylondon

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And I've assumed your Q7 is MY2010 which has a 20-pin Gateway as from model year 09 :thumbs:
 
   #14  

jmjq7tdi

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Unfortunately I still haven’t been able to find my multimeter (I moved recently), so I haven’t tested these connections. I’ve ordered another one and hope to have it within the week.
 
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