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VW T5 (2009) BRS Engine - Bosch EDC16U31 ECU: No Power on Pins 3, 5, 6, Schematics & Relays Needed

mototrampek 15174 7
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  • #1 16702767
    mototrampek
    Level 11  
    Posts: 85
    Rate: 14
    Hello.
    I have no power on the Bosch EDC16U31 engine controller in the VW T5, year 2009 with the BRS engine on pins 3, 5, 6.
    Does anyone have a schematic for this model?
    There are relays in the car than in the repair manual I have.
    The car does not start after disconnecting the battery, the fuses are good.

    greetings
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  • #2 16702773
    T5
    Admin of Cars group  
    Posts: 12856
    Help: 1004
    Rate: 4158
    Relay 109 OK?
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  • #3 16702814
    grala1
    VAG group specialist  
    Posts: 9814
    Help: 1495
    Rate: 5036
    As a colleague wrote above.
    After this relay, there is also a fuse and only EDC.
    Fuses checked?
    Show what relay box you have.
  • #4 16702879
    mototrampek
    Level 11  
    Posts: 85
    Rate: 14
    Thanks for the quick reply but the car doesn't have relay 109 unless I'm looking in the wrong place.
    VW T5 (2009) BRS Engine - Bosch EDC16U31 ECU: No Power on Pins 3, 5, 6, Schematics & Relays Needed
  • #5 16702993
    T5
    Admin of Cars group  
    Posts: 12856
    Help: 1004
    Rate: 4158
    No. 643.
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  • #6 16703128
    mototrampek
    Level 11  
    Posts: 85
    Rate: 14
    Thanks.
    Do you have a schematic for it or do you know how it is controlled?
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  • #7 16703187
    grala1
    VAG group specialist  
    Posts: 9814
    Help: 1495
    Rate: 5036
    This relay is controlled by the EDC.
    The relay coil has a constant plus and the mass is given from the 49 EDC pin.
    The controller gives the weight when the plus e of the ignition switch on the EDC pin 18 appears on the EDC.
    See what this relay is missing and whether the EDC has power from the ignition switch and ground on pins 1, 2, 4.
  • #8 16703239
    mototrampek
    Level 11  
    Posts: 85
    Rate: 14
    I've already checked the mass, it's ok.
    I'll check the rest tomorrow.

    Added after 13 [hours] 52 [minutes]:

    Hello again, I checked again pins 1,2,4 may mass, while the EDC pin 18 gets tension but the boardz strangely shows up first
    7.5V in a moment increases to 10.5V and 12V, while the mass on EDC 49 pin slowly increases 6.5V, then 9.5V and remains so ???.
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Topic summary

✨ The discussion revolves around a VW T5 (2009) with a BRS engine experiencing no power on pins 3, 5, and 6 of the Bosch EDC16U31 ECU. The user seeks a schematic and mentions that the car does not start after disconnecting the battery, despite the fuses being intact. Responses suggest checking Relay 109 and associated fuses, with further inquiries about the relay box configuration. The user confirms the absence of Relay 109 and shares a link to an image for clarification. Additional technical details are provided regarding the relay's control by the EDC, including voltage readings on various pins, indicating potential issues with power supply and grounding.
Generated by the language model.
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