How do I check the SRS Seat buckle connections

[CharlesStevenson]

As title, whilst we've got this lockdown I thought I'd test whether the SRS light on the car was cause by a seatbelt buckle unit, because AFAIK it's the (only) reason that fixing the problem with clear the code without a tool.

But what, specifically, am I looking for?

Is it a wire that runs inside the buckle or it is a connection near to it?

Is this something that can be checked in-situ or is it really something that's only really dealt with by swapping for a (hopefully) working replacement unit?

I've looked on a lot of the previous posts about this issue but I can't find one which specifically states 'this is the connection'.

Thx

[ITSv40]

The seatbelt buckle doesn't interact with the SRS system, the only connection at the buckle is the contact for the seatbelt warning light. The seatbelt SRS connection is in the B pillar and that is where the pyrotechnics are for the belt tensioners. In the event of an accident and the airbags being deployed, the belt tensioners will automatically activate regardless of whether anyone is sitting in the seat or not.

Volvo state that the only test that can be done on the SRS system is to check that the dash light goes out after 7 seconds of switching the ignition on. If not, a full interrogation of the system is needed to trace the fault.

[gatos]

Actually, the driver's seatbelt buckle is also part of the SRS system. Only difference with it, is that it is the only component of the SRS system that can be actually disconnected and connected again, with the battery still connected and the SRS light will not come up as a permanent fault.

Only way I can think off, that you can check if the buckle unit is faulty, is to plug in another one and see if it solves the problem

[CharlesStevenson]

Originally Posted by gatos

Actually, the driver's seatbelt buckle is also part of the SRS system. Only difference with it, is that it is the only component of the SRS system that can be actually disconnected and connected again, with the battery still connected and the SRS light will not come up as a permanent fault.

Only way I can think off, that you can check if the buckle unit is faulty, is to plug in another one and see if it solves the problem

Thx Gatos, that clarifies things for me.