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nitram17



Member Since: 08 Jun 2014
Location: newcastle
Posts: 2261
lohr500 wrote:
I've seen a couple of posts saying that the unit is fully resin sealed and that it's not possible to get to the battery without destroying the unit Sad
My 1st thought was to fit a new battery, as a replacement unit is around £130.

But I have managed to remove the back and hack away at the enough of the sealant to get to the battery. It is more like a silicone mastic than traditional resin potting compound.

Looks like the battery is made up of 7 cells, with 4 in one pack and 3 in the other.

Voltage across the 3 cell pack is 3.90 and across the 4 cell pack 5.24. So 9.15 V in total.

According to the web, fully charged NIMh cells are 1.5V, so 7 would give 10.5V.
Nearly discharged NiMh are 1.2V so 8.4V.

I tried putting 12V across the battery packs but not even a chirp out of the siren.
So I am assuming something has gone wrong either with the internal electronics or sounder itself, or there is a problem with the 10AS unit. But surely it should have gone off when disconnected, regardless of the signal status from the 10AS controller?




I have gone ahead and ordered a replacement though Duckworth's as I have convinced myself that the old unit is scrap.
Sod's Law will no doubt prevail and the new unit won't work either.

Watch this space.


Just found this thread(thanks Kmac)..does anybody know which of the two pins on the bbus battery are the earth and positive as i want to charge my spare on the bench?i suppose i could just use a multimeter but im just checking if its doable outside the truck as i dont want to blow any of the control electronics within the battery!
Post #766542 2nd Apr 2019 3:04pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17371
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
You may find that there is a general reluctance to answer that question since the answer would provide the knowledge required to power the BBUS independently from the vehicle, and hence remove it from a vehicle silently.
Post #766667 3rd Apr 2019 3:04pm
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nitram17



Member Since: 08 Jun 2014
Location: newcastle
Posts: 2261
Thanks blackwolf but that would be some fiddly operation to do that!... I think there are easier and quicker methods of disabling the bbus than that!If you know which is the live and earth could you pm me!Like you i am wary of some people who post on here especially if they have nothing in the gallery and their story dont ring true.You could imagine the scroats joining here to find defender locations as we often give away lots of information of that nature even if its not direct.
Post #766978 5th Apr 2019 10:09am
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lohr500



Member Since: 14 Sep 2014
Location: Skipton
Posts: 1316
United Kingdom 2013 Defender 110 Puma 2.2 XS CSW Santorini Black
Hi Nitram,

Have a look at pages 69 and 70 on this wiring diagram :

https://drive.google.com/file/d/0BxMGNe75oMS3UWhTdU14eXJrWm8/view

I think this diagram will be OK as I believe the BBUS has been the same in all Defenders.

It looks like pin 2 is live and pin 4 is earth. Pins 1 and 3 go to the alarm ECU.
Not sure which way round the pins are numbered though on the 4 pin connector on the BBUS unit.
Post #766983 5th Apr 2019 10:22am
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nitram17



Member Since: 08 Jun 2014
Location: newcastle
Posts: 2261
Thanks LOH Thumbs Up
Post #766984 5th Apr 2019 10:29am
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3414
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
Anyone successfully replaced the batteries on the BBUS? I am not sure what the condition of mine are at over 10 years old. According to the LandRover security manual:

BATTERY BACKED UP SOUNDER (BBUS)
This system is not fitted to all vehicles, but when fitted is mounted above the
wheel arch liner on the drivers side. If the system is tampered with the BBUS
will sound, and will only stop if the power is re-connected and the system armed
and disarmed. It also sounds when the system is miss-locked. The battery life of
the unit is around 3 years. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #985043 10th Mar 2023 2:37pm
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lohr500



Member Since: 14 Sep 2014
Location: Skipton
Posts: 1316
United Kingdom 2013 Defender 110 Puma 2.2 XS CSW Santorini Black
As per the picture I included in an earlier reply to this thread, I struggled to get to the batteries as they are totally encased in a potted resin type material.

I tried to dismantle the BBUS after it failed.

In the end I wasn't convinced that the batteries were the problem. Possibly the electronics or the sounder itself.
Post #985046 10th Mar 2023 2:52pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17371
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
The BBUS is designed so that it is impossible to remove the batteries without destroying the unit, which, in turn, means that the batteries cannot be replaced.

It was a sound policy right up to the moment when it became impossible to buy replacement units. Big Cry

It would be useful if some enterprising supplier started to market pin compatible, direct replacement BBUS units, it cannot be hard to do, there is very little in one of any complexity.
Post #985051 10th Mar 2023 3:24pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3414
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
Thank you for your replies.


As said, I do not know the condition of my BBUS, and my question is more towards a preventive maintenance, and avoid the batteries leaking and corroding the circuitry. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #985055 10th Mar 2023 4:13pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17371
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
I think all that can be done is to test the unit periodically and remove it when it stops working. Then either replace with a COTS solution or rely upon your other security layers.
Post #985063 10th Mar 2023 4:54pm
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steveww



Member Since: 05 Jan 2022
Location: Uppingham
Posts: 567
United Kingdom 2015 Defender 110 Puma 2.2 XS CSW Bronze Green
It's still on my TODO list to figure out a plug in replacement. It's just a battery, logic and charging circuit and a siren. Not that difficult.
Post #985064 10th Mar 2023 5:12pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17371
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Quite so.
Post #985065 10th Mar 2023 5:17pm
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Procta



Member Since: 03 Dec 2016
Location: Sunderland
Posts: 5163
United Kingdom 
is this the thing that makes the very loud BEEP BEEP noise if you try to lock it with a door open? Defender TD5 90 ---/--- Peugeot 306 HDI hatch back

Success is 90% Inspiration and 4 minutes Preparation # you can make it!
Post #985070 10th Mar 2023 5:51pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3414
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
blackwolf wrote:
I think all that can be done is to test the unit periodically and remove it when it stops working. Then either replace with a COTS solution or rely upon your other security layers.


Does the 10AS complain if it is left disconnected? 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #985073 10th Mar 2023 6:13pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17371
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
No. The 10AS doesn't know if it's there or not.
Post #985076 10th Mar 2023 6:42pm
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