Bosch SGS6612GB/12 main circulation pump not running

Thanks Dave! I will check later and report back.
Do you know which of the 3 wires should have mains on them when it is running?

Dave, I found 2 of the wires live but it didn’t seem to change between when I would expect it to run and when I wouldn’t expect it to.

“There are 3 wires to the pump (plus the earth), a white one on the LHS, a grey one on the RHS and another white one going to a black thing in the center. Both the white wires seem to be at 240V both when I would expect the pump to be running and when I wouldn’t.”

So there are 4 terminals on the top of the motor marked 3 2 4 1 reading from the front of the machine to the back when looking at the right hand side of the machine. Terminals 3 & 2 seem to be connected together. Terminals 2 & 4 (the middle ones) are both connected to a small black box with only one terminal coming out. The terminal on the black box is connected to a white wire that comes from the main on / off switch and appears to be a permanent live connection. Terminal 3 (the front one) is another white wire that comes from the rear of the machine.
If I start up the machine with all the 3 wires disconnected it pumps out but doesn’t fill. If I connect the 2 white wires to their correct terminals then it pumps out, fills the manifold and then empties it into the machine ready to start washing.
The grey wire connected to terminal 1 doesn’t seem to have any voltage on it and doesn’t seem to make any difference if it’s connected or not. I have checked the voltage on it both when pumping out and when I would expect that main pump to be running. No volts under either circumstances.
Are these useful clues?

There are also a red and black wire going to a capacitor(?) at the side of the motor.
I’m a bit stuck now as I don’t really know if that implies it’s a faulty motor or the motor isn’t being switched on?

I’ve finally traced the wire all the way back to the control panel and the wire itself is fine. I can buzz the spade connector that connects to the motor terminal right onto the control board.
Does that mean it’s the control board or the motor?
I had a look at the control board and the device that is connected to that pin and it looks perfect.
Is there any way to test the motor? What voltage would it need that terminal to be connected to to make it turn?

Thanks Dave, I’ve done that. That wire always seems to be 0V.
Given that the other connection to the pump is always at 240V shouldn’t that make the pump run?
But it seems to be 0V all the time, when I first turn the machine on and when I would expect that motor to be running?

Although the motor has 4 terminals, two of them are connected together so it’s effectively 3 terminal. There are only 3 wires to it.
With all the wires disconnected but still with the black box connected the only meaningful reading I got was about 2 ohms between terminals 1 & 4 which are next to each other on the right hand side. The black/grey wire we’ve been following is connected to terminal 1.