Why does my abs,seatbelt and airbag lights come on when i use my turn signals

Everything normal until flipped the arm to turn on turn signal. Buzzing sound - coming from steering column or dashboard. Could not tell if the turn signal was flashing. Buzzing was quite evident, not ear piercing but was quite alarming considering was not expecting it. Right away noticed ABS, seatbelt, & airbag light came on simultaneously. At the next turn, turn signal made no sound - not even the blinking sound. The 3 dashboard lights still on. And at the 3rd turn, everything went back to normal - turn signal worked and the dashboard lights went off (all at the same time). Very strange!

NAPA part # EP28. Turn on the signal lights, hope they work at this time, listen for the flasher clicking, find it under the dash and replace it with that NAPA part. Let us know the results.

Thanks... I'll give it a try. How is the flasher making my ABS, seatbelt, and airbag lights come on?

To keep it simple and somewhat understandable, it is called a printed circuit overload on the 'common' ground side. If that does not fix your problem, let us know. If that does fix your problem let us know!

Lets say for the moment that a poor ground circuit is the cause,(quite likely) exactly how does replacing the flasher before that is proven help?

I agree that most here aren't technicians and they will be limited in what they can do, but if the problem is an excessive voltage drop on ground 202 (been there done that) then the flasher will buzz and you can lose communication between the ABS and airbag modules and the instrument cluster when the turn signals are activated. We shouldn't be so fast to pull the trigger on parts without some real proof and it isn't that hard to get.

That is the exact same thing my 04 Monte Carlo SS started doing the other day and now the buzzing is gone the signal doesn't work at all and I'm having no crank no start issues alongside it. And it never happened before the buzzing sound when using the signal stated happening. The buzzing sounded like it was very close to the ignition switch on mine on the dash but a little bit above the switch itself. Sorta where the hazard light switch is at. Can anyone help plz!!!!

See your other post.

The dash mounted hazard warning switch is likely the culprit .. Very common failure on these GM vehicles. Switch replacement will be required. To prove this - push hazard switch on / off repeatedly several times - finishing in the off position - what are the results - everything back to normal now? Post the results for more repair information...... IF desired.

I had the switch unhooked when the signals stopped working as I had the bezel removed checking things. So after reading your suggestion I plugged it back in and the signals work again but at first the car still wouldn't crank. Which having the switch unplugged didn't make a difference with that issue either. Now after I did what you suggested the car seems to be cranking and working fine. It started at least 10 times without a problem and then I pushed the switch in and out some more and it's starting ok again. I haven't been able to get the issue with the airbag light, brake and buzzing to happen again since yesterday when I unhooked the switch to take the bezel off. Have you ever heard of the hazard switch causing the no crank issue like I'm having? I'm very tight on money so I need to be as sure as possible before replacing anything, especially since the other possibilities are so expensive. Thanks for your time and info.