bmw e36 m3 saloon 1996 alarm info

Take one of the indicator outputs and relay it to neg or find the pos lines, blue/something, check your rear lights for the colour, looms behind the glovebox. Laserline, Cobra etc. are totally wrong for this car, non-programmable for timed outputs etc. to give you autolock, window close deadlocking etc.

right got it all fitted today everythings fine, but my petrol flap is not locking! what is causing this? ive checked all connections again and they all seem fine...

First lock the car with the key and manually hold the key in its deadlock and window close position at least 4 secs. That should part close the windows and lock the fuel filler. If not it's the car not the alarm (is the fuel flap actuator working?).
If that does it, alarm must be programmed for total (comfort) close and a 1N4004 diode should go from the lock output, after the relay to the unlock with its band towards unlock. I did mention this a while back.

thank you for your reply! so what your saying is i need to join  lock/unlock outputs from alarm via a diode? what would would happen if a diode wasnt used? (just for info purposes...)

Yes leave out the diode and see your locking system fail to work...if you're lucky otherwise, BANG = £££££
Just realised you're fitting a Laserline. Unless it has a timed or holding output, forget deadlock and window close, it isn't up to it apart from the fact that it's a piece of crap, Italian alarms without aux outputs are totally unsuited to modern cars.

the laserline does have a holding output on lock/unlock wires for 10 seconds which is triggered by holding the button down! can this be used? if i lock the car via key i just need to turn the key and not hold it for 4 seconds to lock everything including petrol flap...

Yes. Holding output to relay 85, 86 and 87 to constant 3 amp fused source, 30 to lock and unlock via inline 1N4004 diodes. This will give you deadlock and window close.

sorry for being a bit thick will i need to use a separate relay? or do i just run a diode across lock/unlock wires from my alarm unit?

You need the relay because that holding wire is neg and your lock triggers are pos. Are you sure you want to attempt this?

i think i may have misinterpreted! my alarm locking/unlocking outputs are configured to positive, when i press to arm and hold the button down it extends the pulse to 10 seconds via the same output... can i just put a diode across lock/unlock outputs from my alarm unit?

Yes, no relay needed, just one diode.

can you tell me why a diode is needed? the ways its wired now the lock/unlock wires are separated, if i joined the lock/unlock wires via 1 diode wouldnt they then be connected?

OK, don't use a diode, watch your lock system fail...£££££ It separates the two in normal circumstances.