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Thread: BeCM waking up - dead battery

  1. 29th December 2010, 07:50 AM #31
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    glenhendry
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    More info on the RR not sleeping in my garage. I persevere because another may find the diagnostics useful in the future, and I would also like to understand this problem rather than just fix it.

    I am quite sure that this problem is localised to my garage, and not connected to my recent "Immobiliser/suspect-BeCM" problem or my recent

    If I park the 2000 4.6 in the garage, the gear selector light comes on again about 25 seconds after going out. The same thing happens in my driveway or front yard or street front parking.

    If it is parked on the other side of the street, it sleeps soundly. If parked at work or a friends, it sleeps soundly.

    So, this morning I parked it in the garage, locked it, and then hit the mains to the house and also isolated the solar panels and inverter - all of which are very close to the car outside the garage. She still woke up. I think this means I can rule out my house as the source of the interference.
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  2. 29th December 2010, 08:07 AM #32
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    Interesting! Maybe your next-door-neighbour has a sleazy Paj your P38 is having a talk to...

    Or next door is a secret bikie fortress with funny electronic equipment. Sneak over and pull his main switch down too...
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  3. 29th December 2010, 08:10 AM #33
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    There was a scare some 20 years ago in the UK about electromagnetic fields in houses that were generated by near by power lines and power boards, affecting kids development.

    You could get a little box called a Field Mouse that you walk around your house and it measures the different levels of flux (someone with more electrical brains than me can fill in the right terminology).

    Try to find an equivilant elector magnetic flux reader thingy and measure your garage and house. Both with the power on and off.

    If I'm not mistaken your power board will still generate electric flux fields even when the power board is switched off. Something to do with the electricity just being there waiting for you.........

    Be warned you may not like what you find.
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  4. 29th December 2010, 08:16 AM #34
    PhilipA
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    Er, you don't have one of them new fangled weather stations by any chance.
    The ones that have the temp sensor outside and relay the data to the home base inside.
    They are notorious for causing 38As to wake up.
    Regards Philip A
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  5. 29th December 2010, 10:16 AM #35
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    Quote Originally Posted by PhilipA View Post
    Er, you don't have one of them new fangled weather stations by any chance.
    The ones that have the temp sensor outside and relay the data to the home base inside.
    They are notorious for causing 38As to wake up.
    Regards Philip A
    No, and I have checked that the neighbours are weather station-less too. I am determined...

    My friend has a spectrum analyser, and I was hopefull but it only had wifi frequencies which are WAY higher than 415/433.
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  6. 29th December 2010, 11:21 AM #36
    Hoges
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    Disclaimer: I have only rudimentary knowledge of what my son cheerfully refers to as "queer trader" stuff... himself being categorised as "black hander" ...I'm sure there are others on this site familiar with this terminology

    The 433MHz band appears to be a very busy place... and is used for all sorts of applications. However, the manner in which transmitting devices in this frequency range are modulated impacts on the extent to which they might cause interference (= sleepy interest?) to a dozing BECM

    Burgular alarms, wireless ethernet networks, doorbells, weather stations and baby monitors to name a few all operate in this band...according to their website, 10% of phone calls for assistance to B&D roller doors related to 433MHz interference issues...

    Good luck with your investigation Sherlock a spectrum analyser and some detective work might just crack it!
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  7. 29th December 2010, 12:19 PM #37
    PhilipA
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    How about remote control ceiling fans?
    Regards Philip A
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  8. 29th December 2010, 02:12 PM #38
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    It may not be a case of a steady frequency. It could be a blip across frequencies. Can you get a spectrum analyser that records over a couple of hours?
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  9. 30th December 2010, 09:34 AM #39
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    I doubt it would be your solar panels and inverter - i've got a 2kW system on my roof too and both P38's never had an issue. The only time my Green one got the ****s was when parked near overhead power lines!

    Cheers
    Keithy
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  10. 30th December 2010, 01:32 PM #40
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    Saw a set of four power meter plugs at Jaycar this morning, guess what, they communicate at 433 MHz . Claimed range of 30m. What else is there nattering away next door on this band?
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