Couple of weeks ago my battery went flat overnight causing the alarm to go off. Recharged battery, checked voltage when engine running +2v and thought OK as I had not used the car for nearly a week (normally used every day), but had done a fair amount of stop start prior to that.
Next morning flat again. Bought & fitted new battery & OK until yesterday - battery flat again.
Time to look for the problem - I've checked back on old threads & the wiki so, to make sure I've got this right ;

1) Car can take up to 20 minutes to go to "sleep" & when fully asleep the "P" light on the gear selector indicator goes out.
2) During this process the drain can start off at around 5A reducing to around .5A.
3) When checking disconnect the bonnet sensing switch.

Other things to check are ;
1) The alternator for discharge when engine/ignition off.
2) Fuse 49 - especially the SatNav.
3) Original Carphone Module.
3) Cover on the OBD port.
Apart from USB chargers left in sockets have I missed anything ?

2003 (BMW) L322 3.0L

Thanks in advance for any help/guidance/pointers. 2003 Range Rover Vogue TD6

I found it better to physically disconnect modules and kit rather than trying to pull fuses, especially with all the media/AV stuff, which all seems to be interlinked. (I did try the fuse checking routine that others suggest, but got nowhere with it.

Get yourself a clamp meter, makes life much easier to test the drain.

Also don't confuse the decimal points you are looking for below 50milliAmps as an OK amp level

You have no doubt found this thread:

https://www.fullfatrr.com/forum/topic47332.html?highlight=drain .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
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Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Thanks Joe - yes, I found the thread & that;'s where I got most of the information from.
Just ordered a Durite 75-0-75A Clamp on for delivery tomorrow.

Although I like my L322 "standard" I would not mind being able to fit an ammeter. 2003 Range Rover Vogue TD6

Well, I've checked the usual "suspects" & did find that the Satnav CD-ROM unit has a jammed CD-ROM in it & continues to try to eject it for some time - disconnected that but still have the same issue.

Not wanting to upset the neighbours thought I'd disconnect the alarm sounder and whilst doing that - ignition off, bonnet switch tie wrapped down I heard the heater/ventilation motor start up for a couple of seconds, then stop every couple of minutes.

Could this be the issue & what controls this fan motor please ? 2003 Range Rover Vogue TD6

There is a YouTube video or two about a little fan running on behind the dash  Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
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Check your alternator output, should be approx 14.8v at 2000rpm then slowly drop back over approx. 15mins of driving, at tick over you need at least 13.5v anything less and you are looking at an alternator- not alternators can back feed when they start failing and drain the battery as well.

Check your battery voltage at rest, tick over and at 2000rpm then report back with the figures. (Note the battery rest voltage needs to be taken after approx 10 minutes so all the control units have shut down... leave the bonnet up, shut all the doors then leave for 10 minutes then read the voltage without opening the doors etc.)

Even with a new battery. when drained flat it hurts the battery capacity, number of flats and depth of discharge and lack of proper charging build up so if I was you, I would budget for another battery and possibly an alternator, belt and idler/tensioner pulleys. It’s very common to need to replace all these items on modern cars due to the load and stress the items are under 👍

have you changed the final stage resistor yet?

Quote:

I heard the heater/ventilation motor start up for a couple of seconds

The main blower?

Are you sure this isn't the FBH firing up then shutting down, with nothing to do?

What drain are you getting with the car asleep? .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

The alternator has been tested ^& although the voltages are correct it does take a couple of seconds from engine start to extinguish the charging light.
The battery was replace about a week ago.
The fan noise is what I always hear when unlocking & getting in before switching on the ignition - I've never heard when when the car is/should be asleep.
I suppose it could be the FBH (which does not work anyway).
I'm loath to replace the alternator until I can verify the actual charge amps (75-0-75) clip on ammeter still not turned up.
It does seem to drop to around 0.5amp when asleep but not watched it constantly.
Not too sure about the "little fan" so I may have to look for the YT clip.

Thanks for your help so far guys. 2003 Range Rover Vogue TD6

Still waiting for the clip on ammeter.

In the meantime ;

Pulled the fuse for the FBH.
Pulled the fuse for the telephone.
Charged the battery during the day.

Locked the car overnight & it started in the morning although maybe did not turn over as quickly as normal, but battery went flat during the day.

Charged up last night & heard the fan noise again - more investigation required. 2003 Range Rover Vogue TD6

DrRob wrote:

There is a YouTube video or two about a little fan running on behind the dash

Mr Tee wrote:

have you changed the final stage resistor yet?

Yes, the FSR is one of the things to check/change. You need one of those monkeys with tiny human hands to change it  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

I have a new FSR (not LR) you can have for a £10 plus postage .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Done - PM sent. 2003 Range Rover Vogue TD6