Hi,
the last couple of months the seat belt buzzer for the back seats has been going of from time to time, only when starting the car though so not in the middle of driving. And mostly when I've opened a backdoor before getting in and driving off, but not exclusively. I figured it might be something to do with temperature as it's been cold for a while but the temperature is higher now and the problem persists. The only way to make it stop is to turn the car off and then on again.

Any thoughts on what might be wrong and how I might fix it?

 

Do you happen to have something in the back seat that would trigger the sensor warning?

Try buckling the seatbelts in back and see if that works.

I believe you can also disable the rear seat reminder in settings.

It’s a safety feature so no one forgets a kiddo in the backseat, which we all know can end in a horrible tragedy.

 

This can happen both if I put something on the back seat or if it's empty.

Regarding the safety feature, I don't really get it as this happens when driving away, so no chance in that scenario to forget someone...

I struggle a bit to understand if this is a sensor issue, software issue or some electrical error.

 

Yeah, I'm at a loss as to what's going on with yours.

I haven't had this happen to me, so I was trying to offer suggestions off the top of my head -- Sorry to not be of help.

Did you manage to check and make sure the Rear Seat Reminder in Settings was turned off?

Hopefully someone else will chime in.

If you've already googled this issue to death and haven't seen any helpful information, it's probably now worth having it looked at properly.

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The attached table may be useful for troubleshooting the problem. The behavior of the warning indicators just before and during buzzer operation may help to identify possible causes.

 

I turned my buzzers off with Techstream some time back. Lights still come on but extinguish after a while.
Dealer can turn off buzzers at your next service or visit.