Old VW lupo airbag module issues ?

   #1  

stylers

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Howdy Folks,

looking at an old 2002 VW Lupo with an airbag module issue. The original module was water damaged and showing 65535 and other hardware fault codes, so a second hand module with same part no. 1C0 909 601 but different index no. (02 vs. original 04) was sourced. With this module, all faults were cleared except a new one appeared - 01299 - Diagnostic Interface for Data Bus (J533) 49-00 - No Communications. So the wiring was checked and the CAN bus was present at the connector, however there is very little activity on the bus when checked with a 'scope - apart from what looks like a request packet every few seconds. With the old airbag module back in, there is no activity on the bus at all. So it looks like the replacement airbag module is actually generating the request, and since there is no activity after that, it looks like its not getting an answer from any other control module. Now this car is very basic, and actually the only items physically on the CAN bus are the engine ECU, the instruments and the airbag module (the car has no ABS). And the gateway (J533) is part of the cluster. The cluster receives all of its signals via hardwired connections, so it looks like it would not need CAN for the engine, and the airbag module itself has a hardwired connection for the dash warning lamp and crash signal. so it would not need CAN either (proven by disconnecting the CAN wires from the cluster). all modules have diagnostics via the K-line to pin 7 of the diag connector.

The coding of the two airbag modules is different, and I cannot change the coding on the replacement airbag module to match the old one - in VCDS it looks like the coding is accepted (the coding window disappears - no error message) but the coding remains the same. Also, I couldn't find any information on the coding of these modules. ERWIN doesn't seem to have any info either apart from some info for coding the gateway J533, which it seems is not accessible on this car - however the coding info I did find would suggest that you could tell it what modules are installed. We also checked the cluster to see if there were any coding options there, and there are options for different engines and country etc, but nothing to enable / disable CAN etc.

just to be sure, we obtained another airbag module with exact same part no. and index no. as the original, however the same code still remains. (and the coding is again different - this module came from a 1U mk1 octavia).

I could change the cluster to see if this will solve the issue, but these are like hens teeth now and buying anything new would make the car an economic write off, so I wanted to see if there is anything I am missing.. perhaps there is an undocumented login code for the airbag modules, and also maybe the gateway J533 should be accessible and its lack of communication would indicate a problem with the cluster.

it seems as if this car is a halfway house between the time CAN came into use and when they stopped using individual wires for each signal. The fact that everything else works without CAN is a pointer.

auto scan posted here with one of the replacement airbag modules, although I note it is missing the cluster for some reason (I will post again if needed).

Thanks for any info or help..

Owen.

Code:
Saturday,11,January,2020,09:55:07:11065
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86
VCDS Version: 19.6.2.0  HEX-V2 CB: 0.4508.4
Data version: 20190930 DS308.0
www.Ross-Tech.com


VIN: WVWZZZ6XZ2B030669   License Plate: 02-XX-XXXX
Mileage: 83224 miles   Repair Order: 



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 6X (6X - VW Lupo (1999 > 2006))
Scan: 01 02 03 08 15 17 19 25 35 37 44 45 55 56
 
VIN: WVWZZZ6XZ2B030669   
-------------------------------------------------------------------------------
Address 01: Engine        Labels: Redir Fail!
   Part No: 030 906 032 CP
   Component: ME7.5.10            3573  
   Coding: 00001
   Shop #: WSC 00046  
   VCID: 5AED93BE450DCA47E73-51CE
   WVWZZZ6XZ2B030669     VWZ1Z0A1891787

No fault code found.
Readiness: 1110 0101

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 1C0 909 601 
   Component: 1T AIRBAG VW51        02  
   Coding: 12628
   Shop #: WSC 02314  
   VCID: 5DE798A254233D7F821-4B5C

1 Fault Found:
01299 - Diagnostic Interface for Data Bus (J533) 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 6X0-953-257.lbl
   Part No: 6X0 953 257 
   Component: IMMO                0008  
   Coding: 00001
   Shop #: WSC 00530  
   VCID: 7DA7F822F4E3DD7FA21-4B1E
   WVWZZZ6XZ2B030669     VWZ1Z0A1891787

No fault code found.

End----(Elapsed Time: 03:14, VBatt start/end: 14.2V/14.2V. VIgn 0.0V)------
 
   #2  

Uwe

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On airbag modules like this, there is precisely one coding that they will accept, and it depends on the index.

Airbag modules like this must be specified by part number and index.

The module in your scan has an index of "01T".

If the coding of a used replacement module is different than the original, then the index is also different.

Please provide a scan of the original module.

Have you checked continuity/integrity of the CAN bus wiring from the airbag module to wherever it goes?

-Uwe-
 
   #3  

stylers

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Hi Uwe,

Thanks for reply. I know the coding is different even on the second one we got.. I have verified the CAN wiring to all of the modules it goes to, namely the instruments, airbag module and engine ECU. all looks ok. I will put the original module back and get an auto scan but I know the original module index was "1R" or "01R" - coding 12626. Its difficult to find these as these codes aren't on the labels externally. This being the case its probably going to have to be a new module or one out of an exact same poverty spec lupo..

Thanks,

Owen.
 
   #4  

stylers

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Hi All,

just posting this scan with the old airbag module as requested.. it looks like there is no way to fix this except for the exact replacement module..

Code:
Wednesday,22,January,2020,10:46:40:11065
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86
VCDS Version: 19.6.2.0  HEX-V2 CB: 0.4508.4
Data version: 20190930 DS308.0
www.Ross-Tech.com


VIN: WVWZZZ6XZ2B030669   License Plate: 


Chassis Type: 6X (6X - VW Lupo (1999 > 2006))
Scan: 01 02 03 08 15 17 19 25 35 37 44 45 55 56
 
VIN: WVWZZZ6XZ2B030669   Mileage: 133900km-83201miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: Redir Fail!
   Part No: 030 906 032 CP
   Component: ME7.5.10            3573  
   Coding: 00001
   Shop #: WSC 00046  
   VCID: 5AED93BE450DCA47E73-51CE
   WVWZZZ6XZ2B030669     VWZ1Z0A1891787

No fault code found.
Readiness: 1110 0001

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 1C0 909 601 
   Component: 1R AIRBAG VW51      0004  
   Coding: 12626
   Shop #: WSC 00046  
   VCID: 5DE798A254233D7F821-4B5C

5 Faults Found:
00532 - Supply Voltage B+ 
            07-10 - Signal too Low - Intermittent
01025 - Trigger for On Board Diagnostic Lamp; Malfunction 
            35-10 - - - Intermittent
65535 - Internal Control Module Memory Error 
            00-10 - - - Intermittent
00588 - Airbag Igniter; Driver Side (N95) 
            32-10 - Resistance Too High - Intermittent
00589 - Airbag Igniter 1; Passenger Side (N131) 
            32-10 - Resistance Too High - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 6X0-920-xxx-17.lbl
   Part No: 6X0 920 901 
   Component: KOMBIINSTRUMENT BOO V24  
   Coding: 00441
   Shop #: WSC 35110  
   VCID: 73B3DE1AC2A79B0FC45-5184

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 6X0-953-257.lbl
   Part No: 6X0 953 257 
   Component: IMMO                0008  
   Coding: 00001
   Shop #: WSC 00530  
   VCID: 7DA7F822F4E3DD7FA21-4B1E
   WVWZZZ6XZ2B030669     VWZ1Z0A1891787

No fault code found.

End----(Elapsed Time: 03:17, VBatt start/end: 14.0V/14.0V. VIgn 0.0V)------
 
   #5  

Uwe

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it looks like there is no way to fix this except for the exact replacement module..
Well, the correct replacement.

The old one is 1C0 909 601 /01R

It's entirely possible that it has been superseded.

-Uwe-
 
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