Yes, the turn signal "click" is nothing more than a sound track played thru the vehicle tweeter speakers in the a-pillar in order to "mimic" the sound made by old type turn signal "relays" that mechanically clicked.
I would guess you have an intermittent problem with the amplifier output signal to the speakers. One way to test this would be if it happens again, either plug in some headphones(or say PC speakers) to the rear audio console (or use wireless headphones if you have the RSE) and if you can hear sound in the headphones, but not in the speakers....then it is isolated in the outputs from the amplifier to the speakers or the amplifier itself (not sure how the sound system is wired in the Acadia).
Head phones work have sound but not speakers.i got the same isue as you, except for mine it syas on the radio "audio muted" when pressing the push to talk botton on the steering wheel. so is that has something to do with the no sound no turning signals sound ? also how to unmute, the manual says hold it for 2 seconds to unmute or something of that nature. didnt work for me.
You have a 7 year old vehicle with 100k miles on it. Just like the tires and brakes on your 2010, struts and shocks are wear items that do need to be replaced. Some of us are old enough to remember when shocks were usually shot by 30k miles. Just part of the price of ownership.We owned a 2010 GMC Acadia SLT2 before this one & had it for lil over 6 years & radio in it never haves us any trouble at all with it other than usual maintenance of fluids, replace tires, & brakes. Since we bought this 2014 a little over a year ago, we’ve had to replace struts & shocks & now this. We love the Acadia but are questioning GMC Acadia’s now!
Thanks for that info and insight. Yes indeed, water intrusion can cause a lot of gremlins in any of the systems in these modern day vehicles.Post is old but thought it might help someone else if I having a very similar but not the exact issues. I have an 09 outlook. I have had no sound from three speakers but the back passenger door is fine. I also have no chimes or blinker sounds that are audible enough to hear, the pillar tweeters are working but can only be heard a few inches away playing music. There is no sunroof because we have had them leak before. I don't think it has Bose anything but it doesn't matter because I learned here that they have the same connections in the doors and that was the problem. Only the drivers side, back door had water inside the connection, but it was a lot. I dried it out with a blow drier and the net day it worked, everything. I sprayed on a sealant but two days later my wife washed the car and it leaked again. I haven't got a permanent fix but I do know the problem.