Rear Wiring Loom

[Stargazer]

Just trying to get my K5 14 back and running after a while off the road.  It was fitted (removed today...) with a Datatool immobiliser.  This was mounted at the rear of the tray under the set, where the tool roll should be.  I managed to trace the wires to the indicators and starter switch but there were five other wires connected to the bike's rear loom.  The wires in the loom are all black! (though one seems to have a silver band at intervals) Two are earth, one has a permanent 12v supply and the other two have neither.  Does anyone know what these wires are for?  Are they for a factory option alarm/immobiliser?  I'm sure they are part of the bike loom as they come out of the loom sheath with the indicator and tail light wiring, also the installer had soldered the datatool wires to them.

One other issue is that on switching  the ignition on the clocks sweep OK but the CHEC message is displayed.  The starter cranks but the fuel pump isn't running (I have connected a supply direct to the pump and it does spin, so it seems to be the signal from the bike).  Any ideas?


Surely the black wires at the back of the bike are not connected to the fuel system??

[Irish in Oz]

From the manual.

[Stargazer]

Thanks, I'll check t he wiring but I haven't touched the wiring to the ECU or the clocks.   The battery has been dead for a while so no power to the ECU or clocks.  Does the ECU need to be reprogrammed?

[Hooli]

Just trying to get my K5 14 back and running after a while off the road.  It was fitted (removed today...) with a Datatool immobiliser.  This was mounted at the rear of the tray under the set, where the tool roll should be.  I managed to trace the wires to the indicators and starter switch but there were five other wires connected to the bike's rear loom.  The wires in the loom are all black! (though one seems to have a silver band at intervals) Two are earth, one has a permanent 12v supply and the other two have neither.  Does anyone know what these wires are for?  Are they for a factory option alarm/immobiliser?  I'm sure they are part of the bike loom as they come out of the loom sheath with the indicator and tail light wiring, also the installer had soldered the datatool wires to them.

One other issue is that on switching  the ignition on the clocks sweep OK but the CHEC message is displayed.  The starter cranks but the fuel pump isn't running (I have connected a supply direct to the pump and it does spin, so it seems to be the signal from the bike).  Any ideas?


Surely the black wires at the back of the bike are not connected to the fuel system??

From memory to get thatcham approved an immobiliser has to disable two things to stop the engine being run. Normally the starter which you've sorted & the fuel pump are chosen.

As the alarm was at the back of the bike I'd suspect a neatly fitted system would  disable the fuel pump relay as it's nearest. That's the lowest relay hung sideways under the LH side panel. If you bridge it's connection and turn ignition on then the pump should run for 3 secs, that'd prove it's the immobiliser wiring that's the issue. Then you can trace the wires back with continuity tests and find which two to join up near the tail. The other two could be to stop it sparking, how that'd fit into the loom I'm not sure.

K5 onwards had factory alarm/immobilsers I think, my K2 doesn't & I've never done much with any 14 that wasn't a K2 or K3 to know the changes in the wiring.

Oh, Datatools always use all black wires to make them harder to bypass. If you trace them back through the loom far enough you should find the real colour wires & be able to join the matching pairs. That'd how I removed one years ago on an ex's bike when the alarms internal battery die & it wouldn't disarm.

[Stargazer]

Hooli,  thanks, I read that in the Datatool fitting instructions I found online.  It would make sense but I am confused with the wiring.  The installation wasn't particularly neat, hence why I think the wires are OEM.  The datatool wires were spliced into these at the tail and protected by a lot of insulation tape...  The datatool wires to the starter were just tie-wrapped to the main loom going to the tail not pulled through the sheathing.  The other end of the sheathing is neat and looks untouched going into the main loom.

I'll check the pump relay tomorrow.

One other thing, I dropped the bike before laying it up, fell heavily off the side stand.  Is there a crash/tilt switch on these bikes???

[gsxbarmy]

There are a number of wires at the back - some of which are "live" that do nothing. When I had my 14, they connected the tracker unit I had fitted to the live and neutral (which I think originally Suzuki intended for a standard alarm). Suzuki also seem to use this conglomeration of wires for bringing together a number of the earth wires. It's a very weird concoction at the back where I think they were trying to use one loom for multiple markets. So if you have some wires which don't seem to connect to anything then I'm not surprised in all honesty

[KiwiCol]

This from section 4 page 18 of the manual

TIP OVER SENSOR (TO SENSOR)
The tip over sensor is located in ahead of the battery holder.
The sensor detects the leaning of the motorcycle. When it leans
more than 43°, the mechanical switch turns ON and a signal is
sent to the ECM. At the same time, this signal cuts OFF current
supply to the fuel pump, fuel injectors and ignition coils.

[Stargazer]

There are a number of wires at the back - some of which are "live" that do nothing. When I had my 14, they connected the tracker unit I had fitted to the live and neutral (which I think originally Suzuki intended for a standard alarm). Suzuki also seem to use this conglomeration of wires for bringing together a number of the earth wires. It's a very weird concoction at the back where I think they were trying to use one loom for multiple markets. So if you have some wires which don't seem to connect to anything then I'm not surprised in all honesty

Barmy, thanks, that's the sort of thing I was thinking.  The installer (I use the term loosely...) must have known about these.  It definitely looks like OEM wiring, just a bit odd that there doesn't seem to be a connector.  If it was intended for an alarm it's possible it does link up to the fuel pump.

[Stargazer]

This from section 4 page 18 of the manual

TIP OVER SENSOR (TO SENSOR)
The tip over sensor is located in ahead of the battery holder.
The sensor detects the leaning of the motorcycle. When it leans
more than 43°, the mechanical switch turns ON and a signal is
sent to the ECM. At the same time, this signal cuts OFF current
supply to the fuel pump, fuel injectors and ignition coils.

Col,  thanks.  Does this need to be manually reset?  If so how?

[grog]

No mate.

[KiwiCol]

This from section 4 page 18 of the manual

TIP OVER SENSOR (TO SENSOR)
The tip over sensor is located in ahead of the battery holder.
The sensor detects the leaning of the motorcycle. When it leans
more than 43°, the mechanical switch turns ON and a signal is
sent to the ECM. At the same time, this signal cuts OFF current
supply to the fuel pump, fuel injectors and ignition coils.

Col,  thanks.  Does this need to be manually reset?  If so how?

You just stand the bike back up & it should go.  It's there to cut out systems in the case of a drop & probably less likely to turn itself into a  roadside BBQ.

[Mick_J]

Datatool often have a couple of extra wires (or even pairs of wires) to connect to seat, top box panniers etc using a simple push switch.  So you may have extra unused wires.

[Stargazer]

Chaps, thanks for all the help, still no further on, in fact the old girl isn't even cranking now...  And still have the CHEC mesage displayed.

I may have discovered what the extra wires are; after a lot of searching on the web I they should have a connector on the end (the Datatool butcher has just hacked it off to connect the alarm...) and it is some sort of diagnostic connector.  The link below is from an SV forum, the 3rd picture in the first post illustrates exactly the wires I have but with a connector on. 

https://www.v-strom.co.uk/smf/index.php?topic=31295.0


According to the information in the post the fuel pump is connected through the connector but there is a bridge wire; for diagnostic purpose the fuel pump can be switched on and off via the connector.  A friend has a similar one on his Busa too, sadly he doesn't have the battery on so he couldn't check the pins for power and earths.  Of the 5 wires I have one at 12v (permanent), 2 earths and two that have no power or earth (permanent or switched).  My logic is that the two which aren't power or earth are the two to connect together.  However, the plot thickens; the mate with the Busa has another Busa loom, this too has a connector with a loop in it which is not shown on any of his circuit diagrams.  He's done a bit of digging on this loom and it is possible one of the linked wires is the 12v feed and the other goes into the ECU.  This could explain the CHEC message as the ECU is not getting its 12v feed.

If anyone has their tail off the bike could they look and see if there is a connector with 5 black wires (a couple may have silver bands on too) going into it, if possible check which pins is live, which are earths and which two are linked (there is a "blank" connector on the end which should have a link in).  Below is a link to a loom on ebay, the 3rd picture shows the rear wiring connections and you can just make out the one with the black wires.  And yes, I have thought of buying it!

[Stargazer]

Sorry link to loom, though it says GSF 650, the link I clicked on said GSX1400, bugger...!  Though the wiring is similar and in a similar position.

https://www.ebay.co.uk/c/726823387

[KiwiCol]

The CHEC message usually means the kill switch is off.