A/c P0645 Code

[Galaxysong]

Hello,
Anybody had this fault code?

P0645: A/C clutch relay control circuit, signal stuck low.

Mk7 Ford Transit 2.2 Dciv 2010

Done a resistance test on the A/c pump coil and found continuity.
Also done a mighty fiddly made-up wire and jump lead test on the pump clutch.
The clutch does jump in and out when connecting the leads, so does this confirm the coil and clutch are ok?

Thinking about replacing the relay but was wondering if anybody has come up against this fault before.

The dash switch lights up and the fan kicks in when the button is pressed.

Thanks...

[Kelarenik]

I encountered the same problem, but changing the relay didn't help. Have you found the cause?