Hello 928 experts! I have a problem My rear window defogger relay I-II buzzes at certain modes. The contact circled below is clicking on and off so quickly it sounds like a buzzing alarm. It buzzes when I turn the defogger button clockwise. If I push the button first which makes the button light up and then turn it clockwise, it stays silent.

Things I tried by now. I opened it up and it doesn't look like something is wrong with the relay. I also twisted all the fuses slightly to see if one wasn't making contact properly. I also pulled a bit on all the relays and pushed a bit on the row of 20 plugs below the relays to check for bad connections. And I exchanged the defroster relay (not defogger) with the fresh air blower relay.

Can I fix this defogger relay? Is it perhaps the defogger button instead of the defogger relay? Please help

 

I wanted to give this a bump. Not many have the ability to fix relays as complicated as this one. Other than cleaning contacts which you have done, I don't know. Perhaps someone else can offer. Hopefully this not an expensive relay.

 

Bump!