OBC Horn - when does it come on?

[Treeman612]

Just retro-fitting OBC - what does the external OBC horn do (yeah, I know, it goes beep!!) - the warning gong tells you low fuel, exceeding pre-set speed, Ice outside etc, but I can't figure out what the external horn does - is it part of the BMW alarm system?

[Dan318-is]

^ i got the same prob as u mate!

were does it go?

[Treeman612]

The horn bolts to the underneath of the flat plate behind the headlights, with lots of holes in it, and the extra loom from n/s has connectors for the OBC horn and the outside temperature sensor located in the top of the n/s brake vent pipe. This loom goes through a grommet next to the main loom in to the n/s bulkhead.

[Cloggy Saint]

The gong sounds for low fuel??

[Dan318-is]

treeman, im lost

theres a blue connector i have loose, sitting by the light cluster but i dont no where to plug it

the temp sensor is in place, the loom has been threaded through bulkhead so thats all done??

[Treeman612]

Datourer - sorry, I think I'm wrong about gong going off when fuel is low.

318iS - the blue connector you have spare is the OBC horn wiring. The only other 'spare' socket at the front end will be the round, black connector to wire in headlight wash/wipe system.

[Dan318-is]

true i have htose two spare

what exactly is the horn one tho?

also, at the back of the unit itself, there is another loose connector, only with very short loom, whats this for?

[A1BMW325iSport]

my OBC horn is mounted under a cover which fits between strut tower and fusebox

[Dan318-is]

yer but mounted to what

what is its purpose exactly?

we are talking horn here not gong correct?

[Dan318-is]

yer but mounted to what

what is its purpose exactly?

we are talking horn here not gong correct?

[Dan318-is]

fuc*ing dial up!

[Cloggy Saint]

aha, so this is how you average 28 posts a day!

[Dan318-is]

double post was accident dude

il be starting college soon so i wont be on here at all

plus this obc thign has been doin me nut ever since i fitted it

one loose blue plug n i dunno where it go

[A1BMW325iSport]

take a photo of the blue plug mate

[Dan318-is]

ok hold on mate

[Dan318-is]

http://img125.imageshack.us/img125/6362/blueplug4wb.jpg

ok that one is the blue plug, which currently runs out off loom by the light cluster, im guessing this is the horn one?

http://img398.imageshack.us/img398/6346 ... lug1ng.jpg

this one is a black plug, which comes out the grommet by the bulkhead near the brake servo an has very little loom, no idea where this goes

[Hyperion]

i think someone with a 318 needs to look and see whats going on over there....
I know why my OBC "bongs", its because my temp sensor is missing it fell off.....somewhere

[Dan318-is]

, dont think my gong work im guyna try it in a mo once i get reply

[A1BMW325iSport]

no idea what wiring you have there mate but its nothing like mine or the others i`ve seen

[Dan318-is]

hmmm

well it seems to work okay

thanks any way mate

[A1BMW325iSport]

maybe its because mine is a 1986 model and you have the later type

[Dan318-is]

or that mines a 318is not a 325?

[gazza]

could they be for your fog lights ...are they behind each headlight

[Dan318-is]

why would the fog lights be connected to the OBC mate?

[gazza]

the blue plug is exactly the same as the ones for the pre wired set up for the fog lights if it is just behind the headlight then it could be one of them

[Dan318-is]

why should it be connected to the foglight?

[Brianmoooore]

[quote="318]

this one is a black plug, which comes out the grommet by the bulkhead near the brake servo an has very little loom, no idea where this goes[/quote]
Just looked at this thread to see why a simple question gete nearly 30 replies!
And still no ones answered the original question - The horn is for the CODE immobilizer function of the OBC.
The black plug by the servo is not used, and should be fitted with a plastic blanking piece. Maybe it's an alternative connector for the horn as on A1BMW325isport's car.

[Dan318-is]

ok brian thanks again amte

wots the blue one for tho, i dont understand why it would plug into the fogs?

[gazza]

sorry for the confusion ...i thought you had the blue plug behind your head light(photo) on the nearside in the same location on my car this is where the foglight plugs are if you dont have them fitted,they are not connected to the obc but the blue plug in the picture is exactly the same as the foglight plug found in this location

[Brianmoooore]

theres a blue connector i have loose, sitting by the light cluster but i dont no where to plug it
?

Light cluster doesn't = instrument cluster does it?
If so are we talking about the little single blue socket that goes to the indicator switch?

[gazza]

http://img125.imageshack.us/img125/6362/blueplug4wb.jpg this is the link brian but its a 2 pole connector this is what has confused me not the single one for the stalk and in the pic it looks next to the headlight

[Dan318-is]

lol

its not one for the instrument cluster,

iv wired it up an it is sitting by the LIGHT cluster, as in headlight cluster, but i cannot see where on earth it plugs into on the fogs, or if it will even reach??

defo an outside connecter tho if u get me?

i was never good at electronics!

[Brianmoooore]

Getting lost now. Is this part of the OBC loom?
IIRC, the only connectors on the OBC loom anywhere near the left(?) lamp cluster are the ones for the CODE alarm horn and the outside temperature sender.
What colour are the wires?

[Dan318-is]

wires i dunno,

basically iv got two spare plugs once wired up in my engine bay, both got the same connecters at the end, one is black and runs out of loom by the bulkhead, the other, the blue one photoed a second ago runs out by the light cluster

IIRC its for the temp sender? no idea in hell were it plugs in

sorry to be so fucking stupid!

[dazleeds]

sounds like temp sensor as u say which fits into airvent in front panel