obc question?

[telski789]

hi,a friend of mine wants to know why theres a gong and a horn attached to the obc loom? we know what the gongs for! why the horn?!!

[Cloggy Saint]

I think the horn sounds if the incorrect code is entered 3 times.

[Simon]

The horn is an alarm for the code function of the OBC.

[telski789]

oh ok,thanks! so can you turn this alarm on and off? is it a motion sensor jobby? what happens when he fits it,will it ask for a new code?? Ta

Tel

[Cloggy Saint]

You can enter a new code when the obc gets power for the first time after being disconnected. The alarm is a straight forward affair which sounds the horn if the code is entered 3 times incorrectly.

[telski789]

so dos the obc act as an immobiliser? do you have to enter the code three times to turn the just the obc on or do's it cut the power to the ecu or somthing? sorry,i aint got a clue about them! also,where do's the obc get its power from,it seems to be standalone? cheers for ya help

Tel

[Cloggy Saint]

The obc gets it's power from the dash cluster, and i believe it cuts power to the fuel pump if the code is entered incorrectly 3 times. You only have to enter the correct code once to start the car.

[telski789]

excellent! one last thing,where the wire go's through the bulk head there is a 2 pin plug that sits just next to the fusebox,on its way towards the temp sensor etc... any ideas what this is for? thanks alot by the way!

Tel

[Cloggy Saint]

Hmm, don't know that one. It could just be the connecting point for the immobiliser loom, but i didn't bother with that feature so can't be sure. I'm sure Mr. Moore will come along later and let you know!

[tourer-dan]

There's a plug which fits a 2 pin socket with green wires for the immobiliser function. The plug on the car loom will either already be connected to a (much better) immobiliser or still have the factory jumper wire across the terminals (it's effectively a neat pre-made break in the fuel pump circuit). IMO, leave the function on the OBC disabled by not plugging that connection.

[Cloggy Saint]

IMO, leave the function on the OBC disabled by not plugging that connection.

Then you don't have to bother fitting the control box!

[telski789]

control box? is that the black one above the ecu? ta

Tel

[Cloggy Saint]

Yeah, that's the one but it's only used for the code function.

[telski789]

so just dont plug it in and theres no code worries? cool!