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.
Have a 2010 E550. The blind spot monitoring quit working on the driver's side, passenger side works as normal.
Took the rear bumper off the car for glueing one of the parking sensors holders as it had broken off on one side and the sensor was partially in the hole. At the same time took a look at the blind spot radar sensors and they both look the same, no corrosion or any visible sign of trouble on them. Disconnected the harness on both to "rub" the connection pins for bad connection but this did not help like cleaning them and bumper surfaces did not either.
Scanned the car already before the bumper job with my Xentry but no errors of any kind and what really bothers me is that blind spot monitoring was not even listed in the modules of the car. I did find under radar control module that "Blind spot monitoring installed", but nothing else.
I have been trying to find where the blind spot monitoring control module is but all I get is the sensor itself, so my question is: Is the sensor also the blind spot monitoring control module build into it?
My next step in this is to remove the bumper cover again and swap the sensors to see if the problem moves with the sensor. This would answer my question, I think, but thought to ask if anybody in this forum knows about this?
My passenger side monitor was bad while the driver's side was good. Neither of modules/sensors looked bad, but you can't tell by a visual inspection
My scantool called these "left/right rear bumper intelligent radar sensor"
When I tried to access the right/passenger module, I received a "link error" so I assumed it was bad.
I replaced the passenger side monitor and all is well now.
BTW, I didn't pull the rear bumper. I could reach the modules from underneath.
So, I assume the module and sensor are the same thing (the box under the rear bumper)
Thanks ghlkal and CalibenzDriver. You confirm my thinking on this problem.
I can access the sensors without removing the bumper cover but the problem is I cannot get the electric connector off. I had big trouble disconnecting when the bumper cover was removed. Is there a special trick to disconnect the harness?
Thanks ghlkal and CalibenzDriver. You confirm my thinking on this problem.
I can access the sensors without removing the bumper cover but the problem is I cannot get the electric connector off. I had big trouble disconnecting when the bumper cover was removed.
Is there a special trick to disconnect the harness?
No no real special trick... perhaps yours is all rusted solid. Be gentle with the tiny plastic connector.
The lock release itself has a latch...
Help release with a small screwdriver or a pick.
🤞
You are right BSpot sensors are full featured modules with built-in independant CAN controllers.
One of the amazing part of troubleshooting is busted modules are quiet when bad enough they can't communicate... silenced!
Lucky you don't need to drop the bumper to access rear BS radar modules.
Harness connectors need to be RTV'ed to prevent water penetration into your new replacement module. These are not repairable after being swamped.
Hope this saves you time.
No such luck as not dropping the bumper cover again to properly get to the sensors.
So, swapped the sensors and the problem now moved to the passenger side. It definitely is a problem with the sensor and not with wiring or other parts.
Can I just buy a new sensor and it is plug and play? My Xentry does not see either side sensor so how could it program/code it anyway?
Below picture shows the two blind spot sensors in my car. The one NOT working is the Autolly one with MB logo on it.
These being different parts tells me the sensor on the passenger side (Tyco Electronics) had been changed already before. I installed it on the driver side where I need the blind spot monitoring more that the passenger side since the passenger side mirror is a convex that shows blind spot better.
Does anybody know what part number I need to match when I get a replacement for the non-functioning sensor? And further, where could I buy one other than the dealer?
No such luck as not dropping the bumper cover again to properly get to the sensors.
So, swapped the sensors and the problem now moved to the passenger side. It definitely is a problem with the sensor and not with wiring or other parts.
Can I just buy a new sensor and it is plug and play? My Xentry does not see either side sensor so how could it program/code it anyway?
Yes, some ppl have reported their rear radars were plugNplay.
In your position I would go ahead and consider used BS modules.
I think module programming with Xentry requires online login unless your specific version features the off-line option.
The white backing plate on the OEM modules is well sealed by fused plastic - It's the connector that needs RTV protection.
Meaning don't replace module and think it's fixed.
Last edited by CaliBenzDriver; Jun 2, 2024 at 09:06 PM.
You have to access EPC using your VIN.
I for fun using W212.090 chassis code, M273 engine and there are so many different P/N depending on other options on the car and if code 803 or 804 the car is.
Holy cow.......
You are right, it is really difficult to remove the connector! I had to use some pliers to carefully wiggle it while I pressed the tab.
Good luck
So, today replaced the bad Blind Spot sensor.
First ordered a new sensor from ebay for $198. Thought that was a bit low cost for a new sensor but tried it. A used part came that I would have accepted for that price, but it did not work. It was actually worse than my own bad sensor as it disabled the whole Blind Spot system while my own just did not work on one side of the car. Returned this and got my money credited back.
Ordered sensor from mbpartscenter.com and installed that sensor and all is good.
That's good news , glad it's been working as it should
Yeah,
I must be a stupid man to install a $500+ sensor in a car that has kbb value of $3000 - $4500, but to get a car with options and quality like my car would take the same money as buying a new E550, which they don't even make anymore. This is a timeless design and looks way better than the new MB sedans (they all look the same now). I would not buy the new body style MB sedan other than maybe, just maybe the S-class with AMG body inserts.
I must be a stupid man to install a $500+ sensor in a car that has kbb value of $3000 - $4500, but to get a car with options and quality like my car would take the same money as buying a new E550, which they don't even make anymore. This is a timeless design and looks way better than the new MB sedans (they all look the same now). I would not buy the new body style MB sedan other than maybe, just maybe the S-class with AMG body inserts.
Design wise , I agree with you . W212s are the best looking E Class cars ever made by Mercedes-Benz to me . For the S Class . W222 AMG but I like W221s too
It's a nice thing you're still with your W212
Design wise , I agree with you . W212s are the best looking E Class cars ever made by Mercedes-Benz to me . For the S Class . W222 AMG but I like W221s too
It's a nice thing you're still with your W212
I also have a 221. That car is the best looking MB sedan they ever made.
Not at all. You want the car to function as it should and when it works like it should that's priceless
Thanks ghlkal,
I know I'm really not stupid but some people going just by like kbb would think they could by my car for that kbb value. I don't think I would let it go for $15 000.
In perfect condition, everything works (fully loaded other than night view I don't have) and the best-looking E-class with those hockey stick DRLs they ever made.
Thiis car is a classic design that never goes old. New ones with the round corners look stupid including the S-class.
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.
depending on other options on the car and if code 803 or 804 the car is.
