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Thread: How to replace a BCM? (2005 T5)

  1. #1
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    How to replace a BCM? (2005 T5)

    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?
    Thanks - and keep safe!!

  2. #2
    Benevolent Dictator Uwe's Avatar
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    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-
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  3. #3
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    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 KomfortgerŠt     0004
       Coding: 00021
       Shop #: WSC 02756
       VCID: EAA738468567
    No fault code found.
    
    End   --------------------------------------------------------------------------------------------------
    Last edited by Uwe; 03-29-2020 at 01:54 PM. Reason: CODE tags

  4. #4
    Verified VCDS User golfi_vend's Avatar
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    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?
    I am a VW Freak - Le WV Freaks OR Come visit me at my work with ODIS concerns - FORSS ODIS GeKo/FaZit access for VW/AUDI/äkoda
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  6. #5
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    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

  7. #6
    Verified VCDS User PetrolDave's Avatar
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    Quote Originally Posted by Eboy View Post
    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.

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  9. #7
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    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.

  10. #8
    Verified VCDS User PetrolDave's Avatar
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    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

  11. #9
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by Eboy View Post
    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-
    Lock-down of sick people: Quarantine
    Lock-down of healthy people: Tyranny

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  13. #10
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    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.

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