Question: Blind spot assist inoperative - 2013
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Junior Member
Joined: Nov 2008
Posts: 24
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W166 ML350 Blutech
Question: Blind spot assist inoperative - 2013
Thanks in advance for your help.
I live in Canada and from what I read my BAS sensor is shot. But which one?
i have a 2013 BT. When I start my ML, both mirrors illuminate a red triangle. About 3-4 seconds later, the passenger side changes to an amber yellow while the driver side does not illuminate anything.
A few questions:
1) Can an someone tell me which sensor is shot?
2) Is there a difference between the driver side and passenger side sensor?
3) what’s the part number?
Again, thanks in advance.
I live in Canada and from what I read my BAS sensor is shot. But which one?
i have a 2013 BT. When I start my ML, both mirrors illuminate a red triangle. About 3-4 seconds later, the passenger side changes to an amber yellow while the driver side does not illuminate anything.
A few questions:
1) Can an someone tell me which sensor is shot?
2) Is there a difference between the driver side and passenger side sensor?
3) what’s the part number?
Again, thanks in advance.
Junior Member
Joined: Sep 2016
Posts: 49
Likes: 9
W166
Not sure about left or right as I had different symptoms - one side was randomly flashing on and off even with no car on the side, and eventually would trigger the inop message until next restart.
But I found the best source is this eBay seller from Germany: https://www.m.ebay.ca/sch/i.html?sid...ne=true&_pgn=1
Came out to about $300 CAD shipped and yes it's the same part for both sides. There are a whole bunch of part numbers for different model years so best to send the seller your VIN and he will match it to the correct listing.
Installation wise, I jacked up the rear differential and placed jack stands on both rear jacking points, removed the wheel and wheel well cover, then reached in behind the bumper to remove.
But I found the best source is this eBay seller from Germany: https://www.m.ebay.ca/sch/i.html?sid...ne=true&_pgn=1
Came out to about $300 CAD shipped and yes it's the same part for both sides. There are a whole bunch of part numbers for different model years so best to send the seller your VIN and he will match it to the correct listing.
Installation wise, I jacked up the rear differential and placed jack stands on both rear jacking points, removed the wheel and wheel well cover, then reached in behind the bumper to remove.
Member
Joined: Sep 2018
Posts: 207
Likes: 30
From: Ontario
ML350
are you sure the sensor is bad?
i ask because i got the same error last summer and it turned out to be a dirty sensor. i went around the car feeling around with my hand behind the bumpers and also banging my hand on the bumpers, and lots of mud/dirt fell out. after that the sensor worked fine for quite some time.
also to determine which sensor, you may be able to find out with an OBD device. i am also getting this same error now, and when i ran an obd scan it told me that it was the right rear sensor causing the error. odd thing this time is that cleaning the sensor did not fix the problem, but the problem seems intermittent. it will say inoperative, but once i start driving it starts to work fine. then usually from leaving the car parked for some time again i get the inoperative error when starting the car, but then it works fine once i start driving.
im also having one keyless go door handle act up and sometimes work and sometimes not, im wondering if the 2 issues are connected and if im maybe not having sensor problems but a battery problem.
i ask because i got the same error last summer and it turned out to be a dirty sensor. i went around the car feeling around with my hand behind the bumpers and also banging my hand on the bumpers, and lots of mud/dirt fell out. after that the sensor worked fine for quite some time.
also to determine which sensor, you may be able to find out with an OBD device. i am also getting this same error now, and when i ran an obd scan it told me that it was the right rear sensor causing the error. odd thing this time is that cleaning the sensor did not fix the problem, but the problem seems intermittent. it will say inoperative, but once i start driving it starts to work fine. then usually from leaving the car parked for some time again i get the inoperative error when starting the car, but then it works fine once i start driving.
im also having one keyless go door handle act up and sometimes work and sometimes not, im wondering if the 2 issues are connected and if im maybe not having sensor problems but a battery problem.
Junior Member
Joined: Sep 2016
Posts: 49
Likes: 9
W166
are you sure the sensor is bad?
i ask because i got the same error last summer and it turned out to be a dirty sensor. i went around the car feeling around with my hand behind the bumpers and also banging my hand on the bumpers, and lots of mud/dirt fell out. after that the sensor worked fine for quite some time.
also to determine which sensor, you may be able to find out with an OBD device. i am also getting this same error now, and when i ran an obd scan it told me that it was the right rear sensor causing the error. odd thing this time is that cleaning the sensor did not fix the problem, but the problem seems intermittent. it will say inoperative, but once i start driving it starts to work fine. then usually from leaving the car parked for some time again i get the inoperative error when starting the car, but then it works fine once i start driving.
i ask because i got the same error last summer and it turned out to be a dirty sensor. i went around the car feeling around with my hand behind the bumpers and also banging my hand on the bumpers, and lots of mud/dirt fell out. after that the sensor worked fine for quite some time.
also to determine which sensor, you may be able to find out with an OBD device. i am also getting this same error now, and when i ran an obd scan it told me that it was the right rear sensor causing the error. odd thing this time is that cleaning the sensor did not fix the problem, but the problem seems intermittent. it will say inoperative, but once i start driving it starts to work fine. then usually from leaving the car parked for some time again i get the inoperative error when starting the car, but then it works fine once i start driving.
Member
Joined: Sep 2018
Posts: 207
Likes: 30
From: Ontario
ML350
You may want to pull the connector and check for signs of corrosion. Mine looked fine but others pointed to water intrusion through the connector as the cause of the failure. These sensors are located in an area that gets significant water, salt spray and dirt kicked up by the rear tires so it's no surprise to see these fail. When I installed the new module I filled the connector with dielectric grease - hopefully this will keep the water out.
cleaned it all out and put everything back but the error still pops up. again odd thing is i get the inoperative error, but in about 1 minute or so the error disappears, blind spot and all sensors seem to work fine.
any other thoughts on what it could be/what i could check? maybe i didnt clean the sensor connector well enough?
BTW what a PITA to get to that sensor behind the bumper, my arm is wrecked from trying to squeeze in there and get the sensor out.
Junior Member
Joined: Sep 2016
Posts: 49
Likes: 9
W166
Did you remove the rear wheel and wheel arch liner? I tried squeezing between the bumper and heat shield at first and it proved impossible. Reaching back from the wheel area was easier but still tricky getting the connector to release as you can really only get one hand back there.
Member
Joined: Sep 2018
Posts: 207
Likes: 30
From: Ontario
ML350
i squeezed between the bumper and whatever else was there, it was very tight (this was on the passenger side). i believe the heat shield is on the driver side and that is the side i wasnt sure how to get at. maybe wheel well is an option, i think i also saw a video/post about loosening a bolt from the heat shield and bending the heat shield back far enough to get a hand in there and reach the sensor.
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Senior Member
Joined: Jan 2012
Posts: 396
Likes: 15
From: Montreal Quebec
2016 C63S, 2012 ML350
You know here in Canada those sensors are covered by MB under an extended warranty program. I had them changed on my ‘12 E63 over a year ago & just recently on my wife’s ‘12 ML350, call them.
just to be clear, neither of my vehicles had/have an extended warranty, nor were they still on the factory warranty
just to be clear, neither of my vehicles had/have an extended warranty, nor were they still on the factory warranty
Last edited by crazy1eye; Jun 3, 2019 at 01:51 PM.
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Senior Member
Joined: Nov 2015
Posts: 272
Likes: 49
From: Ottawa, Ontario
2013 ML350 Bluetec, 1966 Ford Mustang Convertible (sold)
You know here in Canada those sensors are covered by MB under an extended warranty program. I had them changed on my ‘12 E63 over a year ago & just recently on my wife’s ‘12 ML350, call them.
just to be clear, neither of my vehicles had/have an extended warranty, nor were they still on the factory warranty
just to be clear, neither of my vehicles had/have an extended warranty, nor were they still on the factory warranty
Thread Starter
Junior Member
Joined: Nov 2008
Posts: 24
Likes: 1
W166 ML350 Blutech
