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no communications with ecu, can gateway, instruments and immobilizer.

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14K views 10 replies 4 participants last post by  billymade  
#1 ·
I have a 2003 chromaflair beetle that was working fine. Now the engine starts but stops when I release the key and the immo light blinks. I have checked the fuses and cleaned several grounds but still no communications to those modules. The other modules including the factory radio communicate fine. I am using full vcds to to check the communications. I have removed the Instrument cluster and jumpered t32/25(bue connector) to t32a5(gren connector) to try to communicate to the ecu but no communication with that module.

a full scan is below.
Monday,18,October,2021,15:52:27:41841
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 21.9.0.2 (x64)
Data version: 20210903 DS330.0
www.Ross-Tech.com


VIN: 3VWDD21C93M406951 License Plate:
Mileage: Repair Order: chromaflair



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


Chassis Type: 1C - VW New Beetle (1998 > 2010)
Scan: 01 02 03 08 15 17 19 25 29 35 37 39 46 54 56 65 75

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01M-927-733.lbl
Part No: 01M 927 733 MJ
Component: AG4 Getriebe 01M 5022
Coding: 00000
Shop #: WSC 00000
VCID: 040C42A414B86EA965-095A

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 1C0-907-37x-ASR.lbl
Part No: 1C0 907 379 K
Component: ASR FRONT MK60 0103
Coding: 0018945
Shop #: WSC 00066 000 00000
VCID: 3260D47CAE8C101987-5102

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 6Q0-909-605-VW5.lbl
Part No: 1C0 909 605 A
Component: 25 AIRBAG VW51 0E 0004
Coding: 12853
Shop #: WSC 00066
VCID: 2240243CAE6C809977-4B00

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

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 1C0-959-799.lbl
Part No: 1C0 959 799 G
Component: 2K Komfortgerát HLO 0004
Coding: 00064
Shop #: WSC 09217
VCID: 3B7EF95829C6D15154-4AE6

Subsystem 1 - Part No: 1C2959802A
Component: 2K Tõrsteuer.FS KLO 0004

Subsystem 2 - Part No: 1C2959801A
Component: 2K Tõrsteuer.BF KLO 0004

4 Faults Found:
01330 - Central Control Module for Central Convenience (J393)
53-10 - Supply Voltage Too Low - Intermittent
01331 - Door Control Module; Driver Side (J386)
53-10 - Supply Voltage Too Low - Intermittent
01332 - Door Control Module; Passenger Side (J387)
53-10 - Supply Voltage Too Low - Intermittent
00936 - Electric Window Switch in Front Passenger Door (E107).
27-10 - Implausible Signal - Intermittent

-------------------------------------------------------------------------------
Address 54: Rear Spoiler Labels: 1C0-959-733.lbl
Part No: 1C0 959 733 E
Component: Heckspoiler 0002
VCID: 2D5AC700E7B24FE1DA-5196

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 1J0-035-18x-56.clb
Part No: 1C0 035 157 D
Component: Radio DE2 0006
Coding: 06031
Shop #: WSC 00066
VCID: 1D3A17C09712BF614A-51B2

No fault code found.

End-------------------------(Elapsed Time: 04:10)--------------------------
 
#2 ·
Looks like you have codes for a low battery. If you haven't changed it out, I would maybe do that. Low voltage can cause all sorts of funky things to happen.
 
#4 ·
Since it is a new battery check the cables make sure they are tight and the battery voltage is getting every place it should. A multimeter is your friend in this trouble shooting endeavor

Without the car running check your battery voltage, it should be 12.6-8, what ever it is you should have that same voltage to the bolt on your starter the bolt on your alternator and on each side of the fuses on top of the battery. If any of these places show less you've got a problem with the wire.
 
#9 ·
all of the low voltage codes cleared with the new battery. most modules are communicating with vcds but the ecu, immo, can gateway and instruments are not communicating with vcds or each other. the enigine will start and then the immo kills it when the key is released to on. the immo light in the instrument cluster started blinking when this started. I am currently cheking the wire harness for any issues between these modules.
 
#11 · (Edited)
Definitely, try the hard reset, of the ecu; charging issues, can cause the immobilizer to go goofy and kick on the immobilizer, for no particular reason (aside from low voltage). A test of the charging system; to confirm, it is working correctly, is always a first step on these cars.

If the hard reset of the ecu, doesn't make the immobilizer stop kicking on; I would confirm, the immo issue with a full auto scan. Typical, immobilizer faults; will throw a trouble code, normally this would be:

"17978 (P1570) Engine Start Blocked by Immobilizer"


If the code comes up; that would confirm, a immobilizer issue is present. Here is a excellent overview of the immo system and how it works.


Consistent, ongoing immobilizer activation; would then, require troubleshooting to narrow down the issue or another option, is to ship out the ecu, for a immobilizer delete service. This is a common "work around"; for immo issues, that owners or mechanics do, when they are not able to figure things out. We are seeing immo issues become more of a issue; as these cars age and many electrical issues come up, various parts die or wiring problems occur.

I had a ongoing immobilizer problem; that took me awhile, to figure out and in my case, the speedo cluster was defective, a replacement solved the problem (immobilizer chip reside in the speedo cluster). Having VCDS, is definitely helpful; detailed live data testing, self testing of the speedo cluster, confirming the rfid chip in the key fob, is being "seen" by the immo system, etc, can be done, narrowing down the cause of the problem.

Examples of various measuring blocks; to confirm, status of the immobilizer and components, related to it, working or not.


This can be a challenge, a process of elimination but it can be done.