How to replace a BCM? (2005 T5)

Eboy · Mar 27, 2020

Hi all
Just joined as have a specific problem.
I have a faulty BCM on VW Transporter 2005 and have been told it is possible to replace by recoding the new one.
I have searched the forums but unable to see any simple instructions.
Please, please could someone provide me with a dummies guide, step by step on how to do this, as I have no experience using VCDS? :cry:

Thanks - and keep safe!!

Uwe · Mar 27, 2020

Hi and welcome.

The T5 does not have a single BCM. BCM functions are split between the Central Electric Module at address 09 and the Central Convenience Module at address 46. Which of these do you intend to replace?

Please post an Auto-Scan from this van in its current condition for context.

-Uwe-

Eboy · Mar 29, 2020

Hi
and many thanks for the reply.
The suspect BCM is the electrics as I have faulty wipers and after changing the motor and testing the wiring and stalk can find no other faults.(Been told this is a common BCM problem)
The existing BCM is 7H0937049M and the replacement one is 7H0937049J
Below is result from the Auto Scan

Code:

VCDS-Lite Version: Release 1.2
Sunday, 29 March 2020, 15:47:45:63981


Chassis Type: 7H - VW Transporter
Scan: 01,02,03,08,09,0B,0D,15,16,17,18,19,1C,22,2D,37,45,46,47,56,57,6E,76,77,78,7D
 
-------------------------------------------------------------------------------
Address 01: Engine       Labels: Redir Fail!
   Controller: 038 906 016 M
   Component: R4 1,9L EDC 0000SG  6278
   Coding: 0000031
   Shop #: WSC 02756
   VCID: 1E4FA49689AF
No fault code found.
Readiness: N/A

-------------------------------------------------------------------------------
Address 03: ABS Brakes       Labels: None
   Controller: 7H0 907 379 G
   Component: ASR FRONT MK25      0103
   Coding: 0007205
   Shop #: WSC 02756
   VCID: 3905570A3041
No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.       Labels: 7H0-937-049.LBL
   Controller: 7H0 937 049 M
   Component: BORDNETZ SGVER 1.0  0901
   Coding: 0000004
   Shop #: WSC 02756
   VCID: 3C0B4E1E3F73
4 Faults Found:
01598 -  Drive Battery Voltage
            001 -  Upper Limit Exceeded
01598 -  Drive Battery Voltage
            002 -  Lower Limit Exceeded
00077 -  Windshield Wiper Stop Switch (F229)
            004 -  No Signal/Communication
00991 -  Interior Lights
            012 -  Electrical Fault in Circuit - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags       Labels: 6Q0-909-605-VW5.LBL
   Controller: 1C0 909 605 A
   Component: 3B AIRBAG VW51      0008
   Coding: 13122
   Shop #: WSC 02756
   VCID: 22379066BDD7
1 Fault Found:
00532 -  Supply Voltage B+
            07-10 -  Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments       Labels: 7Hx-920-xxx-17.LBL
   Controller: 7H0 920 950 R
   Component: KOMBI+WEGFAHRSP VDO V03
   Coding: 01411
   Shop #: WSC 00000
   VCID: 3A0748063547
   WV1ZZZ7HZ5H088842     VWZ7Z0E1764085
2 Faults Found:
01176 -  Key
            07-10 -  Signal too Low - Intermittent
01314 -  Engine Control Module
            49-10 -  No Communications - Intermittent

-------------------------------------------------------------------------------
Address 19: CAN Gateway       Labels: 6N0-909-901-19.LBL
   Controller: 6N0 909 901 
   Component: Gateway K<->CAN    0001
   Coding: 00006
   Shop #: WSC 02756
   VCID: F0932A2EA3BB
1 Fault Found:
01314 -  Engine Control Module
            49-10 -  No Communications - Intermittent

-------------------------------------------------------------------------------
Address 46: Central Conv.       Labels: 7H0-959-433.LBL
   Controller: 7H0 959 433 BCu
   Component: 2B Komfortgerát     0004
   Coding: 00021
   Shop #: WSC 02756
   VCID: EAA738468567
No fault code found.

End   --------------------------------------------------------------------------------------------------

golfi_vend · Mar 29, 2020

Code:

01598 - Drive Battery Voltage
001 - Upper Limit Exceeded
01598 - Drive Battery Voltage
002 - Lower Limit Exceeded

Have You verified voltage to module 09 per wiring diagram?

Eboy · Mar 30, 2020

Hi
When you say module 09, I can confirm there is voltage to pin 9 on the T18a plug (for wipers) if that is the same? Please let me know if I`m looking in the wrong place?
Many thanks

PetrolDave · Mar 30, 2020

Eboy said:
When you say module 09, I can confirm there is voltage to pin 9 on the T18a plug (for wipers) if that is the same? Please let me know if I`m looking in the wrong place?

It's very probably that module #09 will have more than 1 pin that should have power (always on and ignition switched), you really need to visit the erWin website, pay for a 1 hour subscription, enter your VIN and download ALL the documents relevant to your van (including WDs) as PDF files.

Eboy · Mar 30, 2020

HI
Sorry, little confused, are you calling this BCM as module 9 so I can check all connections at all pins? The wiring diagram calls this - onboard supply control unit.

PetrolDave · Mar 30, 2020

If you look at the VCDS scan you can see that it calls #09 Central Electric and #46 Central Convenience, neither are called BCM so it's probably best that you stop using that TLA.

VAG often use other names on the WD, just to confuse :banghead:

Uwe · Mar 30, 2020

Eboy said:
Sorry, little confused, are you calling this BCM as module 9 so I can check all connections at all pins? The wiring diagram calls this - onboard supply control unit.

In older cars where the "BCM" functionality is split between two modules at 09 and 46, the 09 was traditionally called the "CECM" (Central Electric Control Module) and 46 was called the CCM (Central Convenience Module). The former handled electric loads like exterior lighting, while the latter deal with locks, windows, and such.

-Uwe-

Eboy · Mar 30, 2020

Ahh, ok many thanks for the clarity.
I only checked the wiper voltages. I will check all the other connections to this 09

and report back.

Eboy · Apr 1, 2020

Hi
Ok just to let you know where I am with this. From the workshop manual this particular module is called a - Onboard power supply control unit J519.
I checked all the incoming supply voltages and all ok. So ended up just swapping the unit for the replacement I got and hey presto! All working, the wipers now operate correctly.
Re ran the auto scan and all the information is the same except the 09 showing - 2 Faults Found:
00538 - Reference Voltage
014 - Defective
00969 - Fuse for Heated Rear Window (S41)
014 - Defective

I don't have a rear heated window. I tried recoding this to 04 and now get - 1 Fault Found:
00969 - Fuse for Heated Rear Window (S41)
014 - Defective

So I guess not really a problem as everything is working.

How to replace a BCM? (2005 T5)

Eboy

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Eboy

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