[leman_opc]

OK, understood, so before the system is triggered (e.g. the car is on idle, IDC is below the set threshold to activate WMI) it is correct that I have no "B" symbol on the gauge.

So, combining this outcome with the diagram on the previous page of this thread: no "B" led does not necessarily mean that the failsafe / boost off is active. E.g. in the situation above (the car is on idle, system not triggered due to IDC below the threshold, no "B" led on the gauge) the BCS is still controlled by ECU (white wire linked to brown). In case then the IDC increases and the system is triggered and the flow is outside of "safe window" the "B" led will blink but then stay off and failsafe mode would be switched on (white wire switched to black), when the IDC will the go below the system activation threshold the failsafe mode would be off once again (white wire switched back to black). Correct?