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Thread: CAN BUS - Battery Drain - HELP!!

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  1. Re: CAN BUS - Battery Drain - HELP!! 
    #41
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    Sorry, I've lost track of where we were.

    There's a relay box under the dash. If you can see that and take a picture of the relays in it then it might jog my memory on what was next.
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  2. Re: CAN BUS - Battery Drain - HELP!! 
    #42
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    Sorry, me going off piste and ranting
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  3. Re: CAN BUS - Battery Drain - HELP!! 
    #43
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    Not a problem mate. I'm just at a point now where I'm going to get rid of the car, it's been sat for about a month, I've jumped it a couple of times, but I physically don't have the time to mess around with it, I've been back to work full time for 5 weeks and get home just before dark. Checked the voltage drops for each fuse a while back and found that F25+F26 (from under the hood) when both removed brought it back down to zero.
     
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  4. Re: CAN BUS - Battery Drain - HELP!! 
    #44
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    Wowsers! I wish I had that kind of time and money to spend but £1100 is alot! I think some of the guys that I've been to would be fed up trying to resolve it too.

    The only thing I can think of is that the driver window was replaced a couple of years ago. It's never been as smooth as the other windows going up and down but still works. Unfortunately I don't have the tools to take the door apart myself, and check if there's anything there. I believe you do the front skin/panel on the Mk5's.
    Nor can I recollect anything in particular that may have triggered this event. It only came to light at the beginning of lock-down (in Feb) when I was working from home 3 days a week and in the office 2 days. That's when it first died and needed a jump, and subsequently the same would happen each week unless I took it for a drive :-(
     
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  5. Re: CAN BUS - Battery Drain - HELP!! 
    #45
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    I have a forum members 2012 Passat CC in which has an intermittent battery drain so high that it will drain a brand new fully charged Yuasa 9096 battery to nothing in less than two hours... so much of a drain that when it happens it blows the 10amp fuse in my multimeter!
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  6. Re: CAN BUS - Battery Drain - HELP!! 
    #46
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    That's 120W-~400W of heat going somewhere! An infra-red camera should spot it easily! Or turn the lights out and look for a dull, red glow!!!
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  7. Re: CAN BUS - Battery Drain - HELP!! 
    #47
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    I am surprised I haven't seem smoke! I have ordered an clamp meter curent shunt for tomorrow so I can pull fuses and hair at the same time.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  8. Re: CAN BUS - Battery Drain - HELP!! 
    #48
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    At that rate of draw putting the volt measurement across the metal peek-points on the fuse should give a meaningful reading: Fuse Voltage Drop Charts.
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  9. Re: CAN BUS - Battery Drain - HELP!! 
    #49
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    A clamp meter will be easier, I have got **** loads other work to do and I would like to know the actual draw rather than trying to do it by Ohm's Law.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  10. Re: CAN BUS - Battery Drain - HELP!! 
    #50
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    Ive had 3 emails about this post from tapatalk now so thought i'd have a flick through it. You say rear windows aren't working from drivers door switches and your can bus is in single wire mode.... Sounds like the drivers door loom is shorting out to me. Sorry if you've covered/checked this but my A3 8PA (BKD Engine) has had 2 driver door looms now as the wires keep going brittle and snapping and i kept getting same code. Have you pulled the rubber covers back and checked for snapped wires?
     
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