When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hi all,
I am a new member, but have been lurking for a few years, I have had an E350, and E400 Coupe, and for the last two years a 2016 CLS400, picture below (often requested for a first post!)
For anything mechanical I go to my dealer, but for other stuff I try to figure it out myself, which I have been able to do with a handful of things over the years thanks to this forum.
In the last week, on my 2016 CLS400, the seat belt warning chime went from working normally, to squealing, and then this morning it seems to have completely failed, one squawk and no more. I know that many would be pleased with the peace that this brings, but I for one am not bothered by the chime, I am more bothered about the fact that something isn't working in my car! It's desmie was very quick, so I didn't have an opportunity to figure out where it's located in order to troubleshoot.
Does anyone have any idea where I can find this little beast, so that I can investigate further?
Thanks in advance.
Gratuitous picture:
Freshly cleaned, last fall!
Last edited by will_atl; Mar 16, 2022 at 03:29 PM.
Does anyone have any idea where I can find this little beast, so that I can investigate further?
To start check seat belt connections @ belt connector, and yellow connector/pins under seat raise seat to highest position. Attached seat removal instructions if need be.
So I have a update on this, I took the advice from @konigstiger and took a look under my seat, but I couldn’t put get that connection undone, and I resigned myself to having to take the seat out to get to it. But, as I don’t have an appropriate socket for the bolt (e torx?), I put it on hold until I had time to get the right tools, and time to get the job done.
However, today I took a drive into the city, which involved going on the highway. While on the highway, I was signaling to overtake, someone was coming up behind me and while I waited, they went into my blind spot, the blind spot monitor light flashed, and the chime squawked, just like with the seatbelt. I also noticed that it squawks when opening the door after stopping, I forget the exact condition.
Anyway, I have now confirmed that my warning chime is squawking, rather than chiming, under which ever condition triggers it. This makes me think that the chime itself is giving up on being a useful part of the car 🙁
I think it’s buried in the dash, so I guess digging in to the dash is my next step.I will have a hunt thru the forum to see if I can find a how to/guide.
After doing some more research and digging, I had an inclination that the chime is attached to the back of the instrument cluster, so last night, armed with some pdfs from @konigstiger I pulled it all apart.
What I found is that there is indeed a speaker on the back of the instrument cluster, and I believe that it's a 'unique us3750A', so onto the next steps. Everything has been re-installed and it's still not working, I know my limits and doing anything to the cluster is beyond them!
Bizarrely I met a guy at the weekend, and in conversation it came up that his neighbor fixes instrument clusters, so I am waiting for a call back from him.
Picture of the speaker on the back of the cluster: unique us3750A speaker on back of instrument cluster
When taking out the dash trim, if you have to 'Remove Audio/COMAND display' the details are below
There are two covers on the back, that once opened, you can get a torx driver (T20, I think), onto the screws inside. Unscrew both, and then lift up and gently pull towards you.
Two covers on back of screen, torn head bolts inside (I think that they were T20) Presses in back here Putting it back together again
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
