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kmac

Member Since: 07 Oct 2009
Location: Middlesex
Posts: 1309

2009 Defender 110 Puma 2.4 USW Santorini Black

10AS Alarm and Nanocom on 2010MY USW 110

My alarm keeps going off.

Yesterday I checked the events in the 10AS unit using my Nanocom. Although it went off more than 4 times, there were only two events stored which said "volumetric unit".

When I locked the car with the fob, I checked all doors and they were all locked so can I discount a lock actuator issue that others have had with alarm going off?

I cleaned out all spider webs in the vicinity of the volumetric sensors. This morning the alarm wen off again. However, the Nancom now says it cannot communicate with the 10AS unit.

Does this mean my alarm ECU is kaput? Any other ideas?
I am trying to upgrade the firmware of my Nanocom to the latest ( as I now have v1.10) but my credentials to the restricted area at BackBox Solutions do not work so I have emailed support and waiting for them to revert.

9th Jun 2022 10:25am

Penfold_6290

Member Since: 22 Sep 2021
Location: Dorset
Posts: 317

To eliminate the volumetric sensor you can pop it out of the trim panel and unplug it. The previous owner of my Td5 did this as he left his dogs in the vehicle and didn’t RTFM to work out how to deactivate it.

Try this, if your alarm continues to misbehave you need to look deeper.

12th Jun 2022 12:17am

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2000

Have you had a look at the 10AS unit to see if it has got wet due to water ingress? It would be worth removing it to give it a close inspection.

To do so remove the drivers footwell speaker and look up and you can see it. Remove the two connector plugs and see if there is any moisture or corrosion on the pins etc, then remove the two screws holding the 10AS to enable it’s removal and inspection.

12th Jun 2022 9:41am

kmac

Member Since: 07 Oct 2009
Location: Middlesex
Posts: 1309

So firmware update on the Nanocom enabled reading of 10AS.
Only event was "volumetric sensor open"

Have disconnected it and turned alarm on (by locking with keyfob)

Is there any other way to test the volumetric sensor?

12th Jun 2022 9:51am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17378

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Open one of the windows, lock the car with the alarm set, then (once the alarm has set which takes a few seconds) stick your arm through the open window and wave it in front of the sensor.

Alarm activation = working sensor, no alarm activation = faulty or disconnected sensor.

12th Jun 2022 9:59am

kmac

Member Since: 07 Oct 2009
Location: Middlesex
Posts: 1309

Thanks Mr Wolf

Sounds obvious now when I read what you have said!!

A new one is £321 inc VAT

Also whilst it may well work with something in the car ( can always leave the dog in there), the fault it is exhibiting is it is being activated when I am not expecting it to be (have removed spiders from the vicinity)

12th Jun 2022 10:05am

kmac

Member Since: 07 Oct 2009
Location: Middlesex
Posts: 1309

Over 6 hours with volumetric sensor unplugged and no false alarms !!

12th Jun 2022 3:34pm

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