5th Gen - Fitting a Cobra G193/3198 alarm/immobiliser help

arif_manji · Post by **arif_manji** » Mon Mar 25, 2013 2:00 pm

Hi Guys,

I need some help connecting up the immobilser part of the Cobra G193/3193 to my UK 5th 2.2 VTi. From looking at the manual (attached), is anyone farmilar where and what wire I'm looking for in my Prelude to do this?

Any tips? Any help with this will be appreciated.

Thank you guys,

Arif.

Edit [Merlin] - Sorted your pic so it displays full size when you click it. Easier to see the bits in question

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Mon Mar 25, 2013 2:15 pm

That's not a massively helpful looking installation manual!

The bottom one is obviously looking for a signal from the ignition switch, but it doesn't tell you what signal that is exactly! (switched ignition live? starter motor?)

Similarly the "engine cut-off".
What exactly does it want here? Something going from +ve to -ve or vice-versa?
Mechanically injected diesels definitely had a signal for engine shut off (the only way to stop the engine was to cut fuel by a solenoid valve, which went from +ve valve open to -ve valve closed by spring).
Modern diesels do it by just stopping fuel injection and (all) petrol engines do it by just stopping ignition. So there isn't a signal as such, it would just lose the switched ignition live?
Nearest thing on a prelude that I can think of would be a the fuel shut-off solenoid in the event of an accident, which on 4th gens I think is fitted to JDM but not UKDM? Not sure about 5th gens?
Or could pick up the electric fuel pump signal???

Is there any other info in the manual?

arif_manji · Post by **arif_manji** » Tue Mar 26, 2013 11:31 am

I went through the manual again last night and couldn't find anything more on it.

Is there any obvious engine cut-off wire at the ignition? I was thinking if there is, I'd split it and connect it directly to the two green wires.

I think the second part is looking for a switched ignition live wire.

I really don't want to mess around cutting wires, I was hoping someone has done a installation before?

Thanks wurlycorner for the advice, let me know if you have any more thoughts on this.

Arif.

wurlycorner wrote:That's not a massively helpful looking installation manual!

The bottom one is obviously looking for a signal from the ignition switch, but it doesn't tell you what signal that is exactly! (switched ignition live? starter motor?)

Similarly the "engine cut-off".
What exactly does it want here? Something going from +ve to -ve or vice-versa?
Mechanically injected diesels definitely had a signal for engine shut off (the only way to stop the engine was to cut fuel by a solenoid valve, which went from +ve valve open to -ve valve closed by spring).
Modern diesels do it by just stopping fuel injection and (all) petrol engines do it by just stopping ignition. So there isn't a signal as such, it would just lose the switched ignition live?
Nearest thing on a prelude that I can think of would be a the fuel shut-off solenoid in the event of an accident, which on 4th gens I think is fitted to JDM but not UKDM? Not sure about 5th gens?
Or could pick up the electric fuel pump signal???

Is there any other info in the manual?

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Tue Mar 26, 2013 11:58 am

Only further thoughts are that the Green/Red should go to ignition live.
Not sure what the +15 is meant to mean there though. Assumption would be +15v (which would be reasonable as normal alternator output with engine running is 14.something volts) but why doesn't it say that?

Really not sure what to connect the engine cut off to.
Does the instruction manual say the alarm is meant to have the ability to cut the engine itself? (i.e. if the alarm goes off, it cuts the engine?)
EDIT: re-read your original post and this is the immobiliser bit right? So yes of course it needs the ability to cut the engine

Is there a customer helpline so you can ring and ask them to clarify what signals the alarm is expecting on those wires?

(+rep to Merlin for the edit - that is helpful!)

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Tue Mar 26, 2013 12:08 pm

This brochure says it doesn't have an immobiliser?

http://www.cobravehiclesecurity.co.uk/m ... ochure.pdf

arif_manji · Post by **arif_manji** » Tue Mar 26, 2013 3:30 pm

I bought this brand new from the seller on eBay: http://www.ebay.co.uk/itm/Cobra-G193-Co ... 19d806d832

In the listing, it says "Immobiliser passive arming" and if there are engine cut off connection, surely its an alarm/immobiliser system?

I think the Green/Red disables the arming of the alarm once ignition is on. If the alarm is armed and you try and start the engine, engine should not start and the alarm would go off. That's how I understand it.

wurlycorner wrote:Only further thoughts are that the Green/Red should go to ignition live.
Not sure what the +15 is meant to mean there though. Assumption would be +15v (which would be reasonable as normal alternator output with engine running is 14.something volts) but why doesn't it say that?

Really not sure what to connect the engine cut off to.
Does the instruction manual say the alarm is meant to have the ability to cut the engine itself? (i.e. if the alarm goes off, it cuts the engine?)
EDIT: re-read your original post and this is the immobiliser bit right? So yes of course it needs the ability to cut the engine

Is there a customer helpline so you can ring and ask them to clarify what signals the alarm is expecting on those wires?

(+rep to Merlin for the edit - that is helpful!)

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Tue Mar 26, 2013 3:49 pm

arif_manji wrote: In the listing, it says "Immobiliser passive arming" and if there are engine cut off connection, surely its an alarm/immobiliser system?

I think I read that to mean that it can send a signal to the immobiliser to say 'right mate, I'm armed so do your stuff too - no revvy revyy, capisce?' and 'righto, he wants to get in the car and go and it is 'im this time, not some grubby oik who shouldn't be here, so let it rip'

That might be what the (very badly worded) "Engine cut off" wires are for?
But I might be wrong?!

Anyone else got any thoughts on this?

Thinking a bit more about my suggestion to ring Cobra, they're probably not gonna answer questions about wiring in the alarm, in case you happen not to be the trustworthy new alarm owner you claim to be!

arif_manji · Post by **arif_manji** » Tue Mar 26, 2013 4:12 pm

I'll definetly been ringing Cobra support line to confirm a few questions I have.

Wish I went to someone who could of supplied and fitted the alarm for me, especially with the weather too. It way too cold to be faffing around with cables in this cold lol.

I'm going to be attempting it on Friday morning.