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  1. #11
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    Quote Originally Posted by darkchina811 View Post
    In my Golf 7 there is a fuse in box C under dash which is supposed to supply power only to external lights. well, if I take it out the instrument cluster also powers off. that is written nowhere.
    Its pretty apparent in Elsa - fuse SC17 provides battery voltage to the instrument cluster.

  2. #12
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    I am talking about SC23 or SC31, which should power the two headlights only. I do not remember specifically what happens, but when I pull one of those, either the cluster goes off or the ignition does not turn on anymore.

    car user manual, all schematics, Elsa and all the gods say those two fuses are for the headlights only.

    needless to say, this has always happened since the car was stock.

    I took another look at the WD and those two fuses go straight to BCM for left/right lights supply. it may be the BCM, maybe the internal wiring allows ignition only when those supplies are present.
    Last edited by darkchina811; 07-21-2019 at 05:47 AM.
    my Golf came out of the factory with 13 ECUs. now she has 20. and counting

  3. #13
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    Oh, I see.

    Both these are 40A fuses with heavy gauge 4,0mm2 wiring - quite hefty for only running headlights. I'm guessing they are a more general voltage supply for the BCM.

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  5. #14
    Ross-Tech Employee Jef's Avatar
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    Quote Originally Posted by siLc View Post
    I'm guessing they are a more general voltage supply for the BCM.
    Yep. There tends to be a left side and right side fuse. If there is a poor mechanical connection at the fuse, you can end up with this:

    http://wiki.ross-tech.com/wiki/index...nal_30_(Right)
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  7. #15
    Verified VCDS User DV52's Avatar
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    Quote Originally Posted by darkchina811 View Post
    I am talking about SC23 or SC31, which should power the two headlights only. I do not remember specifically what happens, but when I pull one of those, either the cluster goes off or the ignition does not turn on anymore.

    car user manual, all schematics, Elsa and all the gods say those two fuses are for the headlights only.

    needless to say, this has always happened since the car was stock.

    I took another look at the WD and those two fuses go straight to BCM for left/right lights supply. it may be the BCM, maybe the internal wiring allows ignition only when those supplies are present.
    ^^^ From my reading of the WD (which I fully acknowledge could be incorrect) the BCM on the mk7 has 6 x separately fused T30 supply points. SC23 (pin#66A) and SC31 (pin #1C) are indeed for the right and left headlight Leuchte-sets (I believe). SC42 (pin #73A) is used by the BCM for the central locking function which leaves 3 x "general" T30 supplies:SC43 (pin #73C), SC4 (pin #4C) and SC26 (pin #1A).

    The BCM also produces (or, rather appears to produce) 4 x T15 supplies which I assume are generated through one, or more of the "general" T30 fuses: pin #13A for the main T15 voltage supply relay (J329), pin#14A for the dash panel wiring harness (T15a) and the two Ignition/Starter switch (-D-) connections on pin #44A and pin #47A (although I'm not sure whether these latter 2 x supplies come from, or to the module @ hex 44)

    But if anyone knows how the supply from the "general" T30 pins are distributed - I'm all ears!!!

    Don

    EDIT: For those that have an interest - here is a picture of the PCB from a BCM for MQB platform vehicle - it's quite a sophisticated control processor!!

    Last edited by DV52; 07-29-2019 at 07:16 PM.
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

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  9. #16
    Ross-Tech Employee Jef's Avatar
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    ST?ID=90289

    2006 A3, EPC light on.

    P2294 008852 VCDS-EN-190211 Fuel Pressure Regulator Valve (N276): Open Circuit

    Replaced both low and high side fuel pressure sensors, pulled HPFP out and visually inspected, but no issues found... replace HPFP.

    OK... so check fuse SB6. And fuse is missing. Popped in a 15A fuse, code finally clears out.
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  11. #17
    Ross-Tech Employee Jef's Avatar
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    ST?ID=90809

    2006 A3, front and rear wipers not working, front and rear washers dead as well. Seems we get the call after the J527 and J519 have been replaced.

    J527, look at MVB data, can see wiper/washer switch conditions happening as per factory design with operated. No issue found.

    Are there any fault codes in the J519? Yes, and this is when I'm told the J519 was swapped and find out it hasn't had soft coding done. Good news, an Auto-Scan was performed prior to any parts swapping, so we went to the /scans folder, found the original Auto-Scan, copy/paste the J519 coding. Still no wipers, call ends due to customers at shop.

    Following day, now some relays on the J519 have been replaced, no changes. So what codes are in the J519?

    Has a couple of open/short to ground codes for "control circuit" of the washer pump and wipers. So fuse SB52 any good?

    ... and a missing fuse. Popped in a fuse, wipers work like a champ!
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  13. #18
    Ross-Tech Employee Jef's Avatar
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    ST?ID=92832

    2008 R32

    P0491 001169 VCDS-EN-190211 Secondary Air Injection System: Bank 1: Insufficient Flow
    P0492 001170 VCDS-EN-190211 Secondary Air Injection System: Bank 2: Insufficient Flow

    Tech notes that the sec air pump never runs. Walked through output testing and J299 Sec Air Inj Pump Relay, can hear it clicking, but no action from the pump.

    Fuse SB51 condition?



    Pop in a 40A fuse, run output test again, now the air pump is running.
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  15. #19
    Ross-Tech Employee Jef's Avatar
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    ST?ID=92867

    No comm with car. Using a HEX-USB+CAN (HEX+CAN), port test comes up as not plugged up to car. Is the LED on the HEX+CAN powered up? Nope. Plug up to any other car, does the LED power up? Yes.

    Fuse SC23 good? No, it is popped. Replaced bad fused, can communicate with car now.
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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  17. #20
    Ross-Tech Employee Jef's Avatar
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    ST?ID=93034

    2007 Eos, top won't work, stuck open/stored. Trunk lid can be open and closed, but takes a lot of effort to close it (latch). 26-08-002 data is spot on for an open/stored top. Tech did note the trunk lid close assist (striker on body) doesn't raise up when trunk is opened, that is why it is hard to close rear lid. Tech replaced that motor/striker for closing assist with new unit from dealer, no change.

    No codes in CCM. J256 Roof Electronics has 1 code: 02805 - System Interference

    The rear lid close assist is operated by the J256 on the Eos. Wiring diagram has it listed as J657 "Door closing assist control module"... Anyway, it ain't working. Fuse SC19 good?

    ... there is no fuse SC19... .. uh.. yeah... there are 2 electrical contacts in there....
    Pop in a 7.5A fuse, clear codes... and now everything is working just fine. Car was at another shop and AFTER that visit, the issues started. No clue what other shop did beyond pull a fuse out.

    I'll admit, the fault code of 02805 is typically goof up of the mechanics on the top, so it stops operation of top due to confusing (conflicting) data. It would of been WAY better if there was a fault code along the lines of "closing assist module: No Communication". But at the same time, if an electrical item ain't working... and it is fused....
    Jef
    Ross Tech Support Team, Alpha Squad
    Auto-Scan, learn it, love it, live it... then check the fuses.

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