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Disco 2 Battery drain

Discussion in 'Land Rover Discovery' started by Spot1, Sep 22, 2020.

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  1. Spot1

    Spot1 Well-Known Member

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    I appear to have a battery drain issue... circa 1.8-2A.

    Pulling engine bay fuses I’ve worked out that F13 (BCU) accounts for about 1.6 of the drain and F11 (ABS valve) accounts for the remainder. With both these fuses out the drain is 0.01A which I consider to be reasonable...

    Obviously the BCU is the primary cause of my issues but it controls so much I don’t really know where to start...
    I also feel that the ABS draining circa 0.3A-0.4A on standby is too much also... has anyone got any ideas?

    It’s only been for the last few days that I’ve been having starting issues, which has lead me to investigating so presume it’s a recent fault but haven’t noticed anything faulty/not working/doing weird stuff.

    P.s. I trained in electronics in college (all be-it a few years ago) so know my way around a multi-meter and fault finding, it’s just the specifics of a D2 that I’m not so sure on.
     
  2. sierrafery

    sierrafery Well-Known Member

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    Hi, F13 engine bay is connected to the IDM too not just BCU and the drain on F11 is relevant after the SLABS ECU goes to sleep which means 1.5 hour after the ignition was turned off and no door was opened. The IDM(part of interior fusebox) used to suffer from water ingress/corrosion and i suspect that the drain on F13 is caused by that so you'll have to isolate that path. Do you have diagrams and electrical library ? Start by unplugging the inertia switch while you watch the drain on F13 to see if it drops or not
     
  3. Spot1

    Spot1 Well-Known Member

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    Thank you for the reply, that’s very helpful. I’ll have a go at that tomorrow and see what the results are and report back.
     
  4. Spot1

    Spot1 Well-Known Member

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    I’ll be honest, I’ve not got to sorting this yet however my starter solenoid failed, I’ve just had it apart and cleaned up the contacts (I don’t have replacement parts to hand but they are ordered) and the truck is back to starting on the key... I think I may have found a fault that doesn’t really exist and probably sorts itself out when the BCU etc go to sleep... what is your view on this theory?
     
  5. sierrafery

    sierrafery Well-Known Member

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    Around 2A drain as you said in your first post can't be caused by the BCU as long as it works and has no internal issue
     
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