What’s this please?

[G-RMPS]

I keep finding these. They have a magnetic backing. I am guessing it’s part of the security system but their presence/absence doesn’t seem to change anything.

 

[Just smiffy]

Yep your on the right track there should be similar on the opposite side of where you found it …

 

[Geo]

Its a magnetic reed switch for an alarm system.
If you keep finding them maybe your installer spilt his box when doing yours

 

[G-RMPS]

So would you need two for a door, or a locker door? One on the door and one on the frame. If one falls off would you expect the alarm to go off, if armed!

 

[bertiebasset]

So would you need two for a door, or a locker door? One on the door and one on the frame. If one falls off would you expect the alarm to go off, if armed!

Yes The other one would need a cable to it and be slightly larger.

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[G-RMPS]

Yes the other one is larger. I looked at the one on the garage locker door. It’s on the door, rather than the frame. There’s no sign of a cable going anywhere, just the two hinges.

 

[ChrisL]

It looks similar to the ones vanbitz fit.

 

[Geo]

Not two, but two halves
Reed swich where wires go usually fixed to non moving frame or wall magnetic plate usually fitted to moving part ie door etc as it requires no wire conection.

 

[autorouter]

A reed switch is in two parts. The contacts, with wires, is fixed somewhere inconspicuous. When a magnet is placed next to it, the switch closes, when the magnet moves away, the switch opens.

For example, the contact switch is mounted in the door frame, and the wiring hidden in the wall. When the door is closed, the magnet is near the contacts, and the switch is closed. When the door opens, the magnet moves away and the switch opens. This is used to trigger an alarm if a door is opened.

The magnet doesn't have to actually touch the switch, but usually goes very near it, within a couple of millimetres perhaps.

 

[G-RMPS]

Thanks. Well, here’s the other half of the unit. A little PCB and not a wire in sight. And given these modules are on the locker doors not the frame they were never going to be wired up.

So are these a non-functioning part of the immobiliser, presumably installed by Fiat and not extended by Hymer?

Or is this the subsequent fitting of an alarm which I got done as an Adrian Flux insurance requirement? If so the fitter has conned me because he has only done half the job!

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[Phil 748]

Hi can't see a pic, I fitted an extra contact to our hab door, which is wireless.

 

[autorouter]

Could it be a wireless sensor, with a small battery in it?

 

[Richard n Ann]

Could it be a wireless sensor, with a small battery in it?

Yes 2 x Cr2032. Stick with me kiddo, you'll learn something

 

[G-RMPS]

Well I am learning, so thanks for that. It looks like the PCB is sealed in the box by two plastic pegs. I cannot get behind the PCB without breaking the pegs, so I assume if there are batteries behind they are not meant to be replaced. If so, the batteries must be flat because the alarm isn’t impacted by open doors or missing Reed magnets.

 

[Swifter]

Edit

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[Richard n Ann]

Well I am learning, so thanks for that. It looks like the PCB is sealed in the box by two plastic pegs. I cannot get behind the PCB without breaking the pegs, so I assume if there are batteries behind they are not meant to be replaced. If so, the batteries must be flat because the alarm isn’t impacted by open doors or missing Reed magnets.

Yes it's odd how the batteries aren't easily got to. I just searched on Google images for it, I haven’t got any myself.

Our auto watch infra-red sensor is a similar thing and the batteries are easily slotted in have a look inside it