Anyone seen this before - sensor perhaps? (1 Viewer)

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Apr 6, 2019
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FourWinds Windsport 6.8L V10
Hi. Whilst my boiler was swapped out we found a sensor type widget that comes up through the floor - see picture. No less than 5 wires in connection. Only clue is wiring goes under MH and runs straight back towards cooker on same side of van ........

Google not much help .........

Haven't tested if live yet but curious what it may be. Marked as
SB2
e11 . B11. 10R. 020753


15565622681527157213424936091744.jpg 15565624048692044555401703471069.jpg
 

movan

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E11 10R just comes up as an approval certificate for electrical work. Hope you get a proper answer soon.
 

pappajohn

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I just did a search and it came back as a buzzer with that exact number.
What for is anyone's guess and there's only one Google entry for it.
Aftermarket reverse sensors maybe.
 
Oct 20, 2010
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I found the reference below in a Volvo forum, looks like it could be associated with the towbar wiring.

"have just fitted a tow bar to my 2003 V70 with 7 pin wiring , the tow bar and multicore cable from the socket is not Volvo original. There is a 13 pin connector grey plug in the middle in the boot. The thick pink , thick blue and thin blue are left in the plug ( maybe they are used for the 12 pin caravan sockets ?) but not needed for trailer lighting.

The remaining wires are:

Volvo loom trailer multicore

green/white to green white ( into relay/fuse module)
green to yellow/white
grey to black
white to brown
thick black to white and also a second white to relay/fuse module
pink(thin) to blue
yellow to red

yellow from relay/fuse to yellow on multicore
green from relay/fuse to green on multicore

I have no idea what the relay/fuse module is ( SB2 10R 020753) but it came with the tow bar socket wiring , might even be a 10ohm resistor ?"
Cheers
Ed
 
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Jev88
Apr 6, 2019
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Eye, Peterborough, UK
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I found the reference below in a Volvo forum, looks like it could be associated with the towbar wiring.

"have just fitted a tow bar to my 2003 V70 with 7 pin wiring , the tow bar and multicore cable from the socket is not Volvo original. There is a 13 pin connector grey plug in the middle in the boot. The thick pink , thick blue and thin blue are left in the plug ( maybe they are used for the 12 pin caravan sockets ?) but not needed for trailer lighting.

The remaining wires are:

Volvo loom trailer multicore

green/white to green white ( into relay/fuse module)
green to yellow/white
grey to black
white to brown
thick black to white and also a second white to relay/fuse module
pink(thin) to blue
yellow to red

yellow from relay/fuse to yellow on multicore
green from relay/fuse to green on multicore

I have no idea what the relay/fuse module is ( SB2 10R 020753) but it came with the tow bar socket wiring , might even be a 10ohm resistor ?"
Cheers
Ed

Thanks for digging. No sign of reverse sensors. I do have a big Alko chassis attached tow bar. It's a mystery buzzer?
I don't have anything to plug into tow bar electrics to see if anything happens. My boiler is under the seat that backs on to the driver's seat so would be audible to the driver I guess. I will crawl underneath on a nicer day and follow the cable..... I thought it must have something to do with the boiler as it was right at the end of the old Carver boiler where it pops up through the floor.

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Abacist

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What make model and year is the Motorhome?
Was the tow bar fitted new or aftermarket?
Common to fit 13 pin electrics now which is Euro standard, especially in Volvos. You can then buy a Y shaped splitter which plugs into the 13 pin socket and provides a) trailer lighting socket and b) caravan habitation socket with white cover.
Are you sure it’s not the heater control wiring going to the heater control panel?
 

andynkim

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its probably the indicator warning buzzer to confirm indicators on trailer are working, either has to be visual or audible.

Andy
 

pappajohn

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Think Sheddy hit it on the head.

Trailer indicators, by law, have to have an audible warning heard from the drivers seat if it doesn't have a secondary light on the dash console

I knew I'd seen it before but just couldn't think where.
Mines in a drawer in the workshop.... There's enough crap in the cars spare wheel well what with the aftermarket reverse sensor control box and towing electrics bypass relay module.
There's plenty of trailers with one flashing indicator and a flashing brake light or a pair of flashing rear lights... I won't lose any sleep if a bulb pops.
 
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Jev88
Apr 6, 2019
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What make model and year is the Motorhome?
Was the tow bar fitted new or aftermarket?
Common to fit 13 pin electrics now which is Euro standard, especially in Volvos. You can then buy a Y shaped splitter which plugs into the 13 pin socket and provides a) trailer lighting socket and b) caravan habitation socket with white cover.
Are you sure it’s not the heater control wiring going to the heater control panel?

1999 Autocruise Impala. Looks like towbar is about same age with 7 pin plug.

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Jev88
Apr 6, 2019
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its probably the indicator warning buzzer to confirm indicators on trailer are working, either has to be visual or audible.

Andy

I think you are right. Looks like a small hole at the end and presume it is therefore a buzzer / indicator for towbar.
 

Abacist

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1999 Autocruise Impala. Looks like towbar is about same age with 7 pin plug.

So British built and no need for caravan habitation electrics so just 7 pin trailer lighting but may still have a buzzer fitted to audibly warm of any faults.
 
Aug 6, 2013
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So British built and no need for caravan habitation electrics so just 7 pin trailer lighting but may still have a buzzer fitted to audibly warm of any faults.
7 pin still supplies flashers & that's what the buzzer is. If you research towbar electrics you'll find pictures of that very device along with a couple of modules - one for 12N & the other for 12S (or the 13 pin combo socket). The modules allow the installer to ignore the CANBUS (or even not worry whether it exists or not) when installing towbar electrics. They also circumvent the need to purchase extortionately priced OEM towing electrics & payments for programming etc.
 
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Jev88
Apr 6, 2019
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Never been a tugger so haven't come across these things before.
I wouldn't have guessed it was to do with towbar as the beeper is about 5metres away from towbar.
 
Aug 6, 2013
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Never been a tugger so haven't come across these things before.
I wouldn't have guessed it was to do with towbar as the beeper is about 5metres away from towbar.
Ahh ... but closer to your ears :D. I only know about them because I wired towbar for daughter.

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Abacist

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I put reversing sensors on my last van and ran the buzzer up as far as the heater under one of the beds so it was loud enough to hear! Doh!
 

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