Sensor problems - Blind Spot assist and others
 

I have a 2014 GLK250 and my Blind Spot assist is no longer working (getting message on startup). Sometimes, it will turn on, and other times it won't. I brought it to the dealer, ran tests, and say that two sensors in the bumper gave signs that they needed replacement. I have no problem with sensors for parking, lane assist, proximity (front and back), and I have some doubts about the diagnosis. Does anyone know where the sensors are for the Blind Spot Assist?

I also have had a problem with the sensor for the windshield washer fluid. After I left the dealer, the light came on, but they had just filled it. Happened again a few days later.

Should I worry about the electronics starting to go nuts after only 3500 miles?

Happy otherwise.

Parking assist/proximity uses ultrasonic sensors, the visible ones on the bumper (6 in front, 4 in rear.) Lane keeping assist uses a camera, mounted in your windshield. Distronic Plus and Blind Spot Assist use radar sensors. In the case of Distronic Plus, three radars in the front (one behind the star emblem, two in the bumper). For Blind Spot Assist, there are two radar units in the rear bumper. Your other assist functions will work fine if your Blind Spot Assist radars are acting up, so the diagnosis may actually be correct.

As for wiper fluid top-off warning, I had this happen on my car as well. Tank replaced under warranty, works perfectly now.

Sensors on backorder
 

Thanks for your explanation. Hopefully that will clear the problem.

The issue now is that the sensors are on backorder without any ETA (4 weeks now). A friend with an ML350 waited over 1 year for back ordered sensors for a similar problem. Seems to me there is a bit of quality control problem, and supply chain isn't that great.

That's a very long wait. The sensors, I believe, are made by Continental. Because so many cars are being ordered with at least Blind Spot Assist, it makes sense that supply is short. Still, that's an unusual wait. My dad has had the feature on a number of his cars, in addition to Distronic, or Distronic Plus, and has never had a sensor issue. I also have not had any sensor issues with both Active Blind Spot Assist or Distronic Plus, so far, with nearly 10K miles. So, hopefully, if it is the set of sensors, once replaced, you'll be in good shape.

Was your windshield washer reservoir low or did the sensor just say it was low? MB uses an electronic sensor that requires the washer fluid to be somewhat conductive. After market fluids might not be conductive enough or change with temperature. If the temp goes below 25°F on mine, I get the washer needs refill message each time I start it cold. If the vehicle was in the garage and it is above this temp but the air temp is way down, the message appears after a minute or two and I cancel it. If the engine is warm and therefore the fluid is warm the message will not show up. It all depends on the washer fluid you use. Cheap guys like me put up with the little annoyance.

Funny thing about the reservoir, is that the dealer filled it when they checked the sensor, and the problem occurred a few days later. I hope they didn't use cheap fluid. I will check with them. Nothing different with the temperature or car location. I used quality liquid myself.

Another electronic annoyance is that the keyless entry key is not always recognized, usually when I have my hands full.

Just returned from the dealer with some of the problems fixed:

1) The two radar detectors for the Blind Spot Assist in the rear bumper have been replaced and the system is operational
2) The windshield washer fluid has been replaced and I will monitor
3) The keyless entry system has been reset, and will monitor. It seems that M-B is aware of the problem and static maybe the cause. The key goes into a 'sleep state'. I have to press a button to awaken.

Blind Spot Assist BIG problem for Mercedes
 

My 2013 GLK blind spot assist was an important add-on when I purchased my GLK in Feb. 2013. It worked fine the first Winter but has been faulty most of this past Winter. I brought it in to the Dealership (had to wait almost 2 weeks for an appointment) only to be told the part would have to be ordered and it would take 10 days. it is now week 3 with no replacement sensors to be found. I get an unfolding story every time I call - that there is a HUGE problem with these sensors and MB switched manufacturers and are now ordering them from Germany. apparently they can't make them fast enough to replace all the faulty sensors. this is my first Mercedes and all I can say is I'm missing my Toyota Venza, never one bit of warranty work required and NEVER a wait for service.

Mercedes needs to pick up it's game- I'm one really p***ed-off customer!

Where do I find BSA sensors?
 

Need to check the sensors, how do I get to them? Thanks!

Can corroded contacts not be cleaned, as an alternative to replacing the entire sensor? Seems to me that it's worth a try, especially in light of the cost savings and the apparent supply problem with the part.

Blind spot Assist inop... again.. but there's More...
 

Hi, Long time listener first time caller...

I have a 2013 GLK 350 4matic (x204) and an ML350 Blutec 4matic. I love them both and yes they drive me crazy with the tiny BS issues like 905 000 01 10 Blind spot sensors that fail bi annually. I'm committed to keeping MB pensions funded by purchasing the replacement parts... God I'm dumb.

Recently the 2013 GLK 350 (X204) has posted greater symptoms. With my trusty Autel Maxi AP2000 I've discovered that there's likely a failed CGW (ZGW) Central Gateway (processor?) issue. I've committed to blow my retirement on tools and time... so I purchased a VXDiag VCX c6 unit from china.
I need help to locate the CGW device in the car. Where in tar nation is it. (my money is on the Trunk area... but were specifically... My neighbor... same as me.. feels the ps footwell is where this box of demon spawn resides. Someone help
https://cimg2.ibsrv.net/gimg/www.mbw...52322755fa.jpg
https://cimg9.ibsrv.net/gimg/www.mbw...d5a1d35af9.jpg
the CGW ZGW likely has corroded


Also..

I have spent hours on the online MB parts lookup by vin sites, and I cannot seem to find the CGW part number for my vehicle... would there be an expert in the house who can assist me with some tips to find the CGW ?
Is the CGW the same as the SAM? I'm reaching here... but that's what happens when you go crazy... and I must be crazy...

Thanks kindly DIY DWYER... Paul for short:wall:

Dear DIY DWYER... Paul for short.

I can't help you in any way as my knowledge beyond knowing what DIY stands for, is zero. I do know a witty mind when I come across one and sir, in this era of a troubled world, reading your post above, caused me to break out in a smile. It hurt a little at first, but I'm fine now. "Demon of spawn". That's gold.

Thank you and good luck with all the stuff you've got going on with your car.

the central gateway module is under the drivers front seat, its a pain to get to because thereis a huge plastic cover over it. easier to remove the drivers seat. or just cut a hole in the front of the cover, it is the little white box that mounts to the front of the cubby hole under the black plastic cover. the other module in there is for the parktronic system.

but it sounds like you have a CAN issue with the front end CAN, i would check all your can connections for that for corrosion or water damage. i have seen central gateways go bad many times though.