Side airbag light

[Grant]

Multimeters won't set off an airbag, it's a myth, I've tried it.

The seats have airbags, does anyone know what the yellow plug is for?

I know they won't, its exactly the same method the airbag system uses to monitor them being connected.

Also I was still asleep when I read your first post, lol, so you have 3 plugs on your wiring loom? One for the side air bag, one for the pre-tensioner and then the yellow one?

Correct, will the yellow plug that is not plugged in be what is causing the light to be on, or is it a dud seat?