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Lowe

Member Since: 13 Nov 2017
Location: Frederikssund
Posts: 37

Heater starts alarm

My "new" defender has a webasto diesel pre heater.

When using the heater the car alarm starts after app. 15 minutes
The voltage at the time is 11.91v and the blower is running.

Has anyone had this and is there a cure

30th Jan 2018 8:40pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8171

2011 Defender 110 Puma 2.4 USW Stornoway Grey

i have a webasto engine heater and int heater in mine, neither make the alarm sound.

thats with the screen demist an setting an fan on when using the engine heater

the cabin heater (Air top) has the vents directed down

Is it a std LR alarm?

is the alarm sounding for low voltage? not even sure if this is a feature?

or sounding from air movement?

are you on demist (air up) or to the footwells? or does alarm go off on both?

i am more inclined to think its voltage linked as it takes 15mins. the fan comes on when the coolant is at a certain temp, but that would happen prior to 15mins i would of thought. Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

30th Jan 2018 9:14pm

Lowe

Member Since: 13 Nov 2017
Location: Frederikssund
Posts: 37

Today i changed the battery to a brand new one fully chargede.

Started the heater, and 10 minuts later the alarm went of.

So what can it the bee..

Can the alarm be disarmed with my nanocom ?

15th Mar 2018 6:46pm

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

2013 Defender 110 Puma 2.2 XS DCPU Keswick Green

Heat waves setting off the internal sensor?

15th Mar 2018 7:01pm

Paulv8

Member Since: 09 Jun 2013
Location: Milton Keynes
Posts: 618

1989 Defender 90 V8 Petrol CSW Alpine White

Tape over the ultrasonic sensors and try it. V8 90...WIP

15th Mar 2018 7:30pm

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

I might be getting mixed up between vehicles but I thought there's an alarm/lock option that disables the interior alarm - for when you want to leave a child/pet inside?

16th Mar 2018 7:43am

Scoobeenut

Member Since: 04 Mar 2015
Location: West London
Posts: 310

2010 Defender 90 Puma 2.4 SW Santorini Black

If you lock the car by the key in the door it arms the perimetric alarm and not the volumetric internal alarm so should disable the internal sensor but keep the doors and bonnet protected.

16th Mar 2018 7:56am

Lowe

Member Since: 13 Nov 2017
Location: Frederikssund
Posts: 37

Thanks, now i have some more to go on..

16th Mar 2018 8:11pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8171

my webasto heater air flow set the car alarm off in my '99 td5. i just pulled the wires on the volumatric alarm. locking by key didnt disable on that one. Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

17th Mar 2018 9:32am

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

Lowe wrote:
Thanks, now i have some more to go on..

To be fair, I think jst got you there 1st time:

jst wrote:
or sounding from air movement?

are you on demist (air up) or to the footwells? or does alarm go off on both?

17th Mar 2018 10:29am

Lowe

Member Since: 13 Nov 2017
Location: Frederikssund
Posts: 37

Solved..

Pulled the plug from the volumetric sensor and now we can heat up without waking up the neighbors..

20th Mar 2018 8:46pm

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

I guess the next question should be whether the sensor can be moved, the sensitivity of the OEM one adjusted or can be swapped out for one that mirrors the dual tech ones you get for conservatories?

My RRS had the pre heat facility and never set the interior alarm off so maybe the electronics disable the sensor on start up or it's a different type of sensor?

21st Mar 2018 7:17am

Justtellme

Member Since: 23 Nov 2015
Location: Ottawa
Posts: 310

Perhaps a cut out relay that cuts the wire to the volumetric when the heater or fan is running?

21st Mar 2018 7:15pm

Lowe

Member Since: 13 Nov 2017
Location: Frederikssund
Posts: 37

Suits me fine that the sensor is disconnected, then it dosn´t start the alarm if the dog moves around.

22nd Mar 2018 7:40am

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