L322 BCM upgrade/ Battery drain

P Reg Blue P38 · Nov 13, 2017

Hi,

Still persevering with my 2003 4.4 (LPG). I've been working away from home during the week so the L322 has been sitting. So the battery has drained. A new battery put in for the MoT in June has been flattened and lost.

So the question is is there a fix that will get the BCM to shut down? I've heard of Land Rover Service bulletins about this and an addition to the wiring harness - but does anybody know of a fix that doesn't involve a main dealer.

Wazzajnr · Nov 13, 2017

A battery isolator under the bonnet would do it!

P Reg Blue P38 · Nov 13, 2017

Thanks Wazzajnr. I recently had a 3.9 Classic with that mod. I've got a boat and I isolate the batteries all the time.
I suppose it's no worse than fitting a new battery to replace a dud used battery. Who makes them?

tomcat59alan · Nov 13, 2017

Have you thought of a maintenance charger. I use one on mine when I'm away and my friend has to use one on her Porsche so it's not just a RR issue

Dopey · Nov 13, 2017

P Reg Blue P38 said:
I've got a boat and I isolate the batteries all the time.

Its a legal requirement on a boat I think

Dopey · Nov 13, 2017

http://www.ebay.co.uk/itm/Lucas-Sty...221179?hash=item4622f5707b:g:VhEAAOSwg3FUeVlc

P Reg Blue P38 · Nov 13, 2017

tomcat59alan said:
Have you thought of a maintenance charger. I use one on mine when I'm away and my friend has to use one on her Porsche so it's not just a RR issue

Good idea - I have a fairly expensive Ring Charger. I'll get an outside electric point fitted (my other car is a BMW i3)

myfirstl322 · Nov 13, 2017

P Reg Blue P38 said:
(my other car is a BMW i3)

It's a creeping illness.....

tomcat59alan · Nov 13, 2017

P Reg Blue P38 said:
Good idea - I have a fairly expensive Ring Charger. I'll get an outside electric point fitted (my other car is a BMW i3)

Aldi get them in for about £13 now and again.

P Reg Blue P38 · Nov 13, 2017

myfirstl322 said:
It's a creeping illness.....

It's the future - embrace it! Even Land Rover make hybrid models now!

myfirstl322 · Nov 13, 2017

I'll hug my V8 tvm, not a spontaneously combustible battery pack with non fire retardant carbon fibre...

My thoughts on this matter has nothing whatsoever to do with being burned at the lights by one of your brothers in arms, may you suffer many black outs and punishing tariffs.

myfirstl322 · Nov 13, 2017

Love this fella.

myfirstl322 · Nov 13, 2017

Dang, did you say BMW I30, oh dear lol, my bad,
I blame Alan, don't know exactly how but it's his fault, I guarantee it!!

holidaychicken · Nov 13, 2017

Here is an idea, why not cure the problem rather than the symptom.
Charge the battery fully.
Open the passenger door, push the lock in to the closed position so the door thinks its closed.
Open the bonnet and tape the bonnet alarm switch in the shut position or disconnect the switch so the bonnet thinks its closed.
Connect an ammeter (DC Amps) to the negative terminal and to a good ground like the big nut on the suspension turret.
Lock it using the alarm fob so as far as its concerned all the doors and bonnet are closed which should send it into sleep mode eventually. Press the alarm fob again withing 10 seconds of locking to shut off the interior sensor.
Wait 30 minutes for everything to shut down that should have shut down.
Disconnect the earth lead that connects the negative battery terminal to the inner wing which leaves just your ammeter making the circuit from the negative battery terminal to ground.
This reading will give you how much current is being drawn by any systems that are still running. I believe it is in the region of 20mA that is acceptable, above this and you have a problem.(check this)
You can now start pulling fuses while watching your ammeter to see what fuse drops the current, you may have to do the same with the fuses in the boot and potentially in the engine ECU box under the bonnet.
once you know what is causing the problem you can investigate that part of the system.
Does that make sense - anyone please feel free to add any detail.
it is quite likely your final stage resistor, headlight wipers or anything else.

Wyn Davies · Nov 14, 2017

Great reply. Keeping mine on a trickle charger at the mo which works well. Anyone had any experience of solar trickle chargers?
(Don't have a problem BTW. Not long bought the car so don't think I have.)

tomcat59alan · Nov 15, 2017

myfirstl322 said:
Dang, did you say BMW I30, oh dear lol, my bad,
I blame Alan, don't know exactly how but it's his fault, I guarantee it!!

Of course it is.

holidaychicken · Nov 15, 2017

We had a problem neighbour who had taken to modifying my paint on my RR with a key so I set up a solar charger, mini bullet cam and DVR and that ran constantly and it would still start ok after a week or two
The **** has moved now so I don’t use it any more.
I leave mine parked for up to 2 weeks and still starts fine

tomcat59alan · Nov 15, 2017

Wyn Davies said:
Great reply. Keeping mine on a trickle charger at the mo which works well. Anyone had any experience of solar trickle chargers?
(Don't have a problem BTW. Not long bought the car so don't think I have.)

No good in South Wales Wyn, no Sun.

I use one in Fuerteventua and it keeps the battery topped up. I use a maintenance charger in this country.

Dopey · Nov 15, 2017

I remember some time back (I think it was for the P38) than the headlight wipers have to be parked if they are not it draws current still, I don't know if this apply to yours or not though

tomcat59alan · Nov 15, 2017

Dopey said:
I remember some time back (I think it was for the P38) than the headlight wipers have to be parked if they are not it draws current still, I don't know if this apply to yours or not though

Think that's on the L 322

L322 BCM upgrade/ Battery drain

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