Rear Wiring Loom

[Irish in Oz]

According to the electrical schematic in manual it could be 30A and 15A fuses, ignition switch, side stand relay in conjunction with side stand switch and gear position switch then the engine stop switch, after all that the signal goes to the ECM.

[Irish in Oz]

Here's the best diagram to follow, if your starter motor was working you had power coming out of the kill switch.

[Stargazer]

Got the old girl running!  The circuit diagram I ordered form from Kojaycat arrived this morning; thankfully the diagram has the mystery connector and wires on it (I was worried it may not as these wires did seem to be a bit of a conundrum on the forum!).  Armed with this I had the bike running in less than an hour.  Could have been quicker but I checked and double checked where each wire went as I didn't want to fry the ECU.

According to the diagram (and it fits with the old Busa loom my friend was looking at) there are two connectors.  One with a permanent 12v, this goes to the red/white stripe wire on the starter relay via the fuse box.

The other four wires are in the other connector; one connected to negative/earth, one is a false earth.  It connects to the orange/yellow stripe wire on the side stand relay.  With the relay connected it bells to earth, with the relay removed it is open circuit to earth.  Be aware of this if you use these wires for accessories.  The other two wires are the ones that are connected together.  One is connected to the orange/white stripe wire which goes to the ignition coils and the kill switch.  The other stays black and connects to the other side of ignition coil no.2 and the ECU.

So the CHEC message was displayed because the kill switch didn't have anything to it (not sure if it's 12v or a lower ECU signal voltage, I didn't check...)
As mentioned the butche...installer obviously knew these wires were there and just hacked off the connectors, rubbish soldering and insulation tape connected the immobiliser.

Thanks for all the information and help, it is appreciated.  Hopefully this will help if anyone else has a Datatool 3 system fitted and it causes problems or needs to be removed.

[Irish in Oz]

Good you got it going, but I don't understand how the starter cranked.

[Irish in Oz]

In the wiring diagram I looked at there would appear to be a spare plug with 9 wires most seem to good to inputs into the ECM, I have not looked to see what they can duplicate.

[Stargazer]

Good you got it going, but I don't understand how the starter cranked.

Now I've been through the circuit me either! 

[Stargazer]

In the wiring diagram I looked at there would appear to be a spare plug with 9 wires most seem to good to inputs into the ECM, I have not looked to see what they can duplicate.

On my diagram there are a couple that are not labelled and seem to be spare.  Now she's running I'm not delving any further...

[VladTepes]

Now she's running I'm not delving any further...

Indeed, if it ain't broke...

[Irish in Oz]

I had a look at the Kojaycat website, seems good value for money for an A3 colour laminated diagram.