I presume that by "plugs" you mean the connectors from the air supply solenoids and if it's so means that there's a wiring issue between the ECU and the plug for the LH side solenoid or the ECU is fubar cos for an open circuit there it should log a specific fault code even though nanocom used to miss SLS codes from time to time but the SLS warning light should be on any way. You have to make a continuity test on that circuit. Bridge the pins in the LH side plug and check continuity first at C0391 across pin 5 and earth(disconnect it), i've seen cases when it was bad contact in this connector, if you have continuity to earth there you'll have to check continuity between that point C0377 and the ECU's connector C0655 oin 3 (white/yellow wire all the way) If no continuity 0391 to earth that's the problem cos the wire is interrupted to the solenoid . I hope that the diagram is accurate as i've seen mistakes in RAVE not once
View attachment 284904
View attachment 284905