Re: Pump priming?
 

I also replaced the fuse on the relay and problem is still there. Maybe a bad relay?

Re: Pump priming?
 

It is a possibility. A sticky one? But too consistent. Are the two ground wire from the molex power connector secure?

Please let me know the result of pin 5 (same as the red wire of the grey harness). The system is controlled by this wire (12V to power the system on).

Re: Pump priming?
 

My pump runs for a few seconds as i turn power off to my R56 Mini just as the original poster describes. Is this normal?

Re: Pump priming?
 

I am not sure. Can you take a quick measurement for me on the controller.

The system is controlled by the red wire of the grey connector. If you can measure the voltage of test point #5 during the switching off period. I like to know if there is a voltage there that may cause the pump to run on.

Re: Pump priming?
 

I will try to take this reading for you tomorrow.

What do you mean your not sure its normal?

Re: Pump priming?
 

Normally the system will switch off when 12V is removed from the red wire of the grey harness. Sometime car makers continue to power up the 12V for a few seconds to inspect the sensors after the ignition key is turned off.

This is the period the aquamist system gets a weird reaction. Please also take a look of the threshold led on the controller if it is triggered during this period.

Re: Pump priming?
 

Yes, there is voltage.

NOTE: My car is wired as per your diagram identically.

Re: Pump priming?
 

There is a voltage: need to clarify a bit more please measure these voltages:

Journey start:
1. Ignition key on "off"
2. Ignition key on "accessory"
3. Ignition key on "pre-crank"
4. Ignition key on "run" at idle

End of journey:
5. Ignition key on "accessory" or "stop running"
6. Ignition key on "off"

There is something strange going on. The drawing provided by us is "preliminary" so your feedback is important for us to improve the drawing. Until someone like yourself posting it up, I cannot make alternation.

Basically if you can find a switched 12V that will go to "zero" volt and test pin #5 when you switch off the engine, that will be perfect.

Re: Pump priming?
 

I'll go more into detail tonight when i get off work. Sorry for slacking. It was just a quick measurement by myself last night.

Even so, this isn't really harmful to the system?

Appreciate the effort.

Re: Pump priming?
 

No harm to the controller.