I think this may have been covered before, but I'm still trying to find a solution. Whenever someone is in the passenger seat, the warning light comes on. However, I've had diagnostics carried out, and no fault is indicated. There is also nothing shown in the diagnostics history. Any ideas? I guess the problem must be something to do with the wiring under the seat, but why the diagnostics don't show anything is a mystery. Cheers, Simon.