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tobz102

Member Since: 07 Feb 2014
Location: Atherstone
Posts: 134

2008 Defender 90 Puma 2.4 HT Stornoway Grey

Is it hailing outside? Yes... the alarms going off again

Anyone else alarm go off during heavy hail shower? Currently occurring in the midlands and for the second time the alarm has gone off. Last time it happened I cleaned all my door sensors thinking it was rain getting in and shorting, but it's happened again this time. Beginning to think the vibration from hitting against my none insulated HT is playing with the ultrasonic sensor

27th Feb 2017 5:24pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19636

It'll be the sensor, although mine hasn't done it.
Do you have any rear headlining? Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

27th Feb 2017 5:46pm

zsd-puma

Member Since: 09 Aug 2016
Location: Kent
Posts: 2720

2010 Defender 110 Puma 2.4 USW Santorini Black

The sensor is basically a sonar, the noise on the roof will fool it. Just like reversing beepers and alarms can fool parking sensors.

Sticking 3 or 4 deadening pads on the inside of your tin roof will help (you don't have to cover the whole thing with them)

Then if you want to go a bit further cover the deadening pads and the whole inside of the roof with 6mm closed cell foam.

That'll have the added benefits of improving the noise levels when driving and offer better thermal insulation too.

28th Feb 2017 1:27am

tobz102

Member Since: 07 Feb 2014
Location: Atherstone
Posts: 134

Thanks for replies, food for thought. Probably end up trying to insulate it somehow...

28th Feb 2017 9:27am

dorsetsmith

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

Check that your ultrasonic sensor is dry and water loge had same problem with my pick, condensation inside metal roof panel dripping down onto the back ultrasonic sensor short it out and trigging alarm

28th Feb 2017 10:11am

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