X9 500 Evo centre stand

[plbuckland]

My Centre stand has stopped working (2004 Evo 500). There is no power at the handlebar button, no power at the relay under the right footpad. Where is the main control unit located? Do you have to remove the luggage compartment to find it? Book says the other relay is on right side of battery but on mine this is the starter relay. There are 3 large fuses on the left side of the battery but these are all OK.

[Dave Milnes]

There is a master relay to the left of the battery with a 70A fuse. This sometimes corrodes!
There is also a relay under the footboard on the side where the ram is. This gets damp!
The main actuator controller is behind the LH painted panel next to the voltage regulator and the wiring plug to that can also get green pins and on top of all that lot there are two plunger switches on the stand pivot itself. One detects the stand being deployed, and one the reverse. The tiny spade connectors on these sometimes come adrift.

The button doesn't have power it goes to ground, as do the 2 switches on the stand itself.
All power is routed via the big relay next to the battery (left side) then through the relay under the footboard.
The thin yellow wires carry the relay trigger live and the black wires the ground via the switch.
The controller, next to the regulator behind the LH painted side panel (yes it has to come off) is simply another relay that if it is not receiving the ground signals from the switches on the stand pivots, doesn't feed the live to the other relays.
Diagrams are in the manual available to download from the help section.

[plbuckland]

Thanks for that. I have checked out both relays, they are OK and by bypassing them the stand works fine. But I cant get 12 volts on the yellow wire going to the relays - it is giving readings between 4 and 6 volts and virtually no amperage. Even with everything disconnected (2 x relays, stand control unit and the relay control unit above the fuel tank) I am still getting a low reading on the multimeter. I suspect it is just a leakage, but am mystified where it is coming from. I would think the yellow wire should have 12v at all times and that it would get its power from pin 11 on the stand control unit, but it doesnt. There isnt 12 volts there. I would have thought that the lt blue wire (pin 12 on the stand central unit) would have been the voltage supply, but this is only supplying 10.5 volts (and less than 2MA) when there is 12.5 volts at the battery. Maybe the problem is in the digital dash?

[Dave Milnes]

The digidash doesn't have anything to do with the stand.
It has a pin connection for the warning light (Alarm) and the control box links into the front wheel speedo sensor so it won't work if you are moving (and possibly if the sensor wiring is broken or disconnected?).
The switch takes it's ground from the kill switch so it doesn't work if the side stand is down or the kill switch is OFF.
The switching +ve seems to come from Fuse 1 5A then it also needs clean grounds from the two stand plunger switches.
I'm also looking into mine today so will report back if I find anything else.

[plbuckland]

I am getting 12 volts at the wire to pin 1 (Violet) on the stand control unit, but there is not 12 volt coming out at the Yellow wire (Pin 11) which to me seems to be wrong. Havent tried it yet, but was thinking maybe I should cut the yellow wire from the control unit and give it 12 volts from somewhere else. This should make the relays work but not sure about the relay control unit above the fuel tank, which seems to be only some soort of warning horn (I suspect it works for more than the centre stand). If Pin 11 on the control unit should have 12 volts maybe its that unit thats faulty.

[Dave Milnes]

Bridge pin 1 purple wire and pin 11 yellow wire and the stand does work. You will have bypassed all the safety interlocks and the pump will run at any time you press the button even when moving.
The biggest problem with this is that the pump isn't automatically stopped when the stand is fully deployed. If a simple relay was used in place of the control box switching the purple to yellow wires and using the orange wire from the LH plunger switch as -ve to the relay coil and a +ve from an ignition fused source to the remaining relay coil the motor would cut when the stand is fully down, but it would still operate at all other times.
I think the sounder on the tank is the main system error sounder and is also involved when a Piaggio alarm is connected to the dedicated connector under the front fairing, as it is what feeds the alarm light on the digidash. It sounds when something goes faulty.
The sounder on the controller does the bleeping for normal stand operation.

[plbuckland]

Will try to get to have a look at it tomorrow. Sounds like it may be the Stand Control unit playing up. I am waiting on a new Digital Dash unit (could not get one here so have one on order from A J Sutton). At present I have a unit from a 250 in it which is giving me erroneous tacho and temp readings and am thinking the centre stand stopped working around that time, so want to check that out first. The speedo is working correctly so guess the Light Blue wire must be OK. But I was thinking if the Stand Control Unit is faulty I may replace it with a normally closed relay and take power from say the rear light circuit so it only connects when the key is off, thus the stand wouldnt have power unless the key is off. I could then run the existing underfloor relay to be disconnected by the limit switch.

[Dave Milnes]

The only wire that goes to the digidash is a ground to Pin 10 (not 16 as on the above pic - will amend ASAP) and is just the -ve for the ALARM LED lamp. Even with the central sounder completely disconnected the stand still works.
What I cannot fathom is why it is wired with 2 relays operating simultaneously in series? It's not as if the safety interlocks operated on one or the other. The safety interlocks report directly to the controller which controlls both relays as if they were one.

[Lazyacre]

Bridge pin 1 purple wire and pin 11 yellow wire and the stand does work.

Dave, any chance of a photo on this? I'm not sure where you mean.
Ta!
Phil

[Dave Milnes]

On the stand control unit next to the regulator, unplug the connector on the bottom and find the purple wire at on end of one row. This is pin1 in a row of 8, the next row is 9 to 16 so the 3rd wire should be yellow.
Get a piece of 5A fuse wire and stick one end into the pin 1 and the other into pin 11 and without reconnecting the plug the stand should now work.
This bridging has bypassed the control box and also the safety detent switches on the stand and the detection from the speedo sender. The stand will now work even when moving and will only stop when you release the button so be careful not to trigger it at speed or to keep the button pressed too long.