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Arsath

Member Since: 20 May 2015
Location: Sri Lanka
Posts: 133

2010 Defender 110 Puma 2.4 CSW Fuji White

Alarm goes off everytime battery is removed and attached

Hi, as some of you know I don't live where my car is.. (at least not where my Defender is) , I use the Defender once in two months or once a month if I am lucky.
One of the persistent problems I am facing is everytime the battery is detached and reattached the car alarm goes off.. I am the third owner of the car and the immobilization code is not known..

The fun part is I have to depend on my mechanic who has an OBD computer specially made for Land Rover Defender who changes some settings to stop the alarm and start the car.. Once it is started then the car works normally.. My mechanic use to work at the Land Rover dealer in Sri Lanka and he knows what he is doing and I have no problem trusting him.

Anything that he could be overlooking? Is there a permanent solution to this?

20th Feb 2016 12:25pm

Go Beyond

Member Since: 30 Jan 2012
Location: Headcorn, Kent
Posts: 6678

It's your battery back up sounder that is going off.

Read your handbook or google for the correct way to disconnect the battery without the alarm going off.

20th Feb 2016 3:19pm

Arsath

Member Since: 20 May 2015
Location: Sri Lanka
Posts: 133

Thanks Matt. Is there anyway I could completely disable the immobiliser?

27th Feb 2016 4:28am

Flyingfocrs

Member Since: 12 Jan 2015
Location: Deepest darkest Aberdeenshire
Posts: 155

2011 Defender 110 Puma 2.4 USW Santorini Black

Is the battery fully charged when you reconnect it?
Discovered this years ago with my Focus RS if you reconnect a less than fully charged battery the alarm goes off, fully charged battery it doesn't.
Alarm system is detecting a voltage drop which makes it think the car is being tampered with.

27th Feb 2016 8:18am

spudfan

Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4709

Could you not use a battery booster starting pack? Connect the terminal clips on the jump leads of the battery pack to the terminals on the battery leads before disconnecting them. Then when you remove the battery leads there is still power to the electrical system in the car. You could remove the battery, then fit a new one, reconnect the terminal leads and remove the battery booster clips from the battery terminals.
Any reason whu this should not work? 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai

27th Feb 2016 8:51pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Go Beyond wrote:
It's your battery back up sounder that is going off.

Read your handbook or google for the correct way to disconnect the battery without the alarm going off.

Taken from the Defender 2.4 TDCI workshop manual;
Make sure no data is required from the ECM as battery cable disconnection will erase fault codes and idle / drive values held in the keep alive memory.
Record audio unit keycode.
To avoid alarm going off; 1. Loosen ground cable nut. 2. Turn ignition key to run position. 3. Turn ignition key to off position. Within 17 seconds of turning ignition to off, release battery ground cable from battery.

Pretty much the same info is provided in the owners handbook for my 2.2 model, but says 15 seconds not 17.
Hope that helps.

27th Feb 2016 9:02pm

Arsath

Member Since: 20 May 2015
Location: Sri Lanka
Posts: 133

Thanks guys.. anyway is it possible to disable the immobilizer permanently..

29th Feb 2016 5:02pm

Soupy

Member Since: 05 Dec 2014
Location: Aberdeen
Posts: 68

Yes. You need a odb reader capable of coms with the AS10.

I have a Hawkeye pro (bit expensive) but I believe a standard hawkeye would do it. Most independent LR garages should be able to do it.

2nd Mar 2016 2:26pm

Arsath

Member Since: 20 May 2015
Location: Sri Lanka
Posts: 133

Thanks, my mechanic has a hawkeye pro.. do you know what exactly needs to be done?

3rd Mar 2016 11:10am

Soupy

Member Since: 05 Dec 2014
Location: Aberdeen
Posts: 68

I don't I'm afraid. There are a couple of things you need to turn off to make it stick. Hopefully Lorryman100 will be along shortly to advise....

3rd Mar 2016 2:33pm

Arsath

Member Since: 20 May 2015
Location: Sri Lanka
Posts: 133

Thanks.. I will wait for his response..

3rd Mar 2016 4:42pm

hornet

Member Since: 04 Jan 2010
Location: Western Europe
Posts: 361

Taken from Lucas AS-10 Alarm Guide:

Arm on lock: This setting configures the alarm to not set whenever the vehicle is
locked using the plip or the key. Setting this to DISABLED effectively turns off all alarm
protection although it does not affect the immobiliser. This can be disabled using the
PLIP IMMOBILISE and KEY IMMOBILISE. Turning off all three literally turns the alarm
ECU into a central locking controller only.

Edit: I read about changing the county-code to JAPAN should do the same job.

4th Mar 2016 12:08pm

Arsath

Member Since: 20 May 2015
Location: Sri Lanka
Posts: 133

I found the attached DIAGNOSTIC FUNCTIONS OF THE AS10 ALARM(Defender) on the net , hope it will be useful for someone..
DIAGNOSTIC FUNCTIONS OF THE AS10 ALARM(Defender)

6th Mar 2016 11:34pm

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