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Thread: Retrofit memory seats Passat B8

  1. #1
    Verified VCDS User sam1754's Avatar
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    Retrofit memory seats Passat B8

    Hello,
    I bought this :


    I have semi-electric driver seat. So I have to wire and code vehicule before I can use it...
    I need some help.
    Thanks

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    buy one hour on erwin and print-to-PDF all schematics for you VIN.

    anyway, you already have power for the seat so you most probably need to run just the can-bus line.

    a few modules will need recoding but I am not sure which one and how...
    my Golf came out of the factory with 13 ECUs. now she has 20. and counting

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  4. #3
    Verified VCDS User sam1754's Avatar
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    Thanks for your reply, I have diagrams, downloaded here: https://vwts.ru/vw/b8/vw-passat-b8-w...agrams-eng.pdf
    And component location: https://vwts.ru/vw/b8/vw-passat-b8-c...ations-eng.pdf
    May it help someone and guide me through this retrofit.

    I think you-re right fordriver seat but for passenger one, it's different. I haven't yet any electric function...

    And I must drive wires from fuse panel to the back clim control unit to power rear seat heating.

    I think it'll be a very long job.

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    You'll have to run Comfort CAN to the driver's seat anyway to get memory to work. If this seat also has ventilation, the ventilators are LIN submodules of the BCM, so there's wires to run for these also.

  6. #5
    Verified VCDS User sam1754's Avatar
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    Ok, no ventilator.
    Where is located the comfort CAN?
    I'll check in documents above but it's good to have guidance through this retrofit.
    Thanks

  7. #6
    Verified VCDS User sam1754's Avatar
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    Ok, I watched the diagram. I think you're talking about the CAN Gateway J533.
    I saw from driver seat controller plug T32b pin 15(CAN low) and pin 16(CAN high) to CAN gateway (J533) plug T20e pin 5 and pin 15 via coupling point under driver seat.
    So, I might just have to run two wires from CAN Gateway to driver seat coupling point?
    My back and my knees remember soldering job for A5 module retrofit...
    Downtime talked about a coupling point below A pillar. Any picture please?

  8. #7
    Verified VCDS User sam1754's Avatar
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    Can I find some coupling points here to run to Can gateway?

  9. #8
    Verified VCDS User sam1754's Avatar
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    I found that CAN gateway (J533) T20e pin 5 and pin 15 are wired to LID control module which is really easily reachable.
    My question is: Can I solder CanH an CanL from driver seat module on any corresponding wire?

  10. #9
    Verified VCDS User sam1754's Avatar
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    So, I took time to learn a little about CAN system and I can now answer to myself. We can plug modules everywhere in CAN line (BUS). It's just a communication line where modules have to be declared in Can gateway to be allowed to communicate each others, sending requests and data responses.
    I think now I'll never pay again for plug and play wiring with silly implementation instructions. It's make you put your head upside down unusefully
    Now, I understand what Downtime said... searching the better coupling point to solder

  11. #10
    Verified VCDS User sam1754's Avatar
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    I bought a complete harness for the rear bench. It'll be easier.
    Anyone could confirm or not what I said on this post about Can Bus wiring?

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