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L322 battery drain

Discussion in 'Range Rover' started by badfluffy, Oct 12, 2020.

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  1. badfluffy

    badfluffy Active Member

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    my business partner loved my range rover so bought one of his own, so i now have 2 to look after which brings me to hes first problem, when locked and everything has gone to sleep he still has something running, a faint hum can be heard when you place your ear to the drivers side bonnet but i cant find where its coming from as once the bonnet is open it stops, anyone out there have a clue as to what it might be
     
  2. tomcat59alan

    tomcat59alan Well-Known Member

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    Isn't there a little cooling fan in that area for one of the electronic gubbins. I'm working from memory of reading previous posts.headlight wipers not correctl parking is a favourite drain I believe
     
  3. badfluffy

    badfluffy Active Member

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    first thing i looked at was headlight wipers, cooling fan makes sense as its that kind of low hum but what would make it stay on?
     
  4. Shedload

    Shedload Member

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    Not sure which models but some had a small cooling fan for the PCM module, which I think is under the leafscreen. This would run for a short while until the module reaches a pre-determined temp.
    You can depress the bonnet catches to fool the car into thinking bonnet is closed, giving you opportunity to have a better listen.
    Is it actually draining the battery or a just in case ?
    If so you could try removing fuses one at a time, just beware this could introduce ghost faults.
     
  5. badfluffy

    badfluffy Active Member

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    it does drain the battery but so far not enough to stop it starting, it does sound like the hum of a small fan
     
  6. Shedload

    Shedload Member

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    Sorry can't be more help. Trip the bonnet catches and try removing fuses 1 x 1. If it engine controlled it will probably be engine bay fuse box.
     
  7. kds

    kds Well-Known Member

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    If its a l322 have goooogle for FSR (final stage resister) its the heater fan running slow with ignition off.
     
  8. Tricky of York

    Tricky of York Well-Known Member

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    When you say gone to sleep, how long are you waiting because a total shutdown can be over 20 minutes as I experienced on my last RR when chasing battery drain?
    Tricky.
     
  9. badfluffy

    badfluffy Active Member

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    was well over 2 hours yesterday and could still here something running
     
  10. Tricky of York

    Tricky of York Well-Known Member

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    Definitely need to track it down. There’s a lot of sensors that can be in play on these cars so finding out what is running is the first step then we can help look at what is likely to keep it running. The fan may not be the issue but will be linked to it. There are people here who can help but they need more information. Awaiting your update.
    Tricky.
     
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