Newbie, with two questions

[ajs67donzi]

I just bought my son-in-law's 2015 GMC Denali, and have a couple of questions. I've had great success with other forums, regarding vintage road bicycles and Donzis, so I respect and appreciate the expertise of experienced truck owners. Thanks in advance for any and all input!

 

 #1) The left side Lane Departure Warning seat vibrator does not work. Is that a part that I could replace somewhat easily? Or, is there another reason for it not working? Consequently, a warning message occurs upon start-up, requiring me to dismiss it. Is there a way to eliminate this message?

 

#3) The truck has 22" wheels, which from my understanding has only aesthetic advantages. The ride seems a bit harsh, so will I notice better comfort by switching to 20" wheels? I agree that 18's might appear too small for the wheel well, but wonder if switching to 20's is worth it. (Usage is city and highway driving only, with occasional towing.)

[Lsgun1]

Is the seat vibrator disabled?

 

People do say 20s ride nicer than 22s. If your tires have a lot of life left I would just wait it out though, I wouldn't expect a HUGE difference.

[ajs67donzi]

The seat vibrator is not disabled...as the right side works fine.

[ajs67donzi]

The internet is a marvelous thing, helping me answer my own question!

The GM part # is 84287377, and a how-to video is below.

 

I believe the same part is used over several years, but that's not a certainty.

I found the part on fleabay for about $40, compared to the dealer price of $360!

It's a pretty simple and straightforward operation, and the video is well done.

 

Apparently this is a fairly common problem, according to the narration. Another situation where it happened often, but not often enough to require an official fix or recall. In this truck's case the previous owner was in an out of the truck often, and weighed about 200 lbs. That may have prompted a wire to wear, like the one they showed in the tutorial.