Turn signal problem with 2009 MB ML320 Blutech
Thread Starter
Newbie
Joined: Jul 2021
Posts: 2
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2009 Mercedes Benz ML320 BluTec
Turn signal problem with 2009 MB ML320 Blutech
Hello,
This is my first MB. I took the car to inspection yesterday and it failed for rear right turn signal not working. I was aware of some issues with the car when I bought it like needing brakes, etc. The dash was showing "brake wear" and "left brake lamp" warnings. They both went away at the same time after I replaced the brakes. Then no warning messages appeared except a check engine light and a tire pressure warning.
I took the car to inspection and the right turn signal light is not working. After taking the car back home, the "brake wear" and "left brake lamp" warnings showed up again on the dash.
I replaced the turn signal bulb, but that was not the problem. I did some research and now suspecting the SAM. I was not sure of the location so I did more research and found that it was on the right side under the fuse box. I took it off to replace it but after doing even more research, I am finding that the new one needs to be programmed after installation.
Any suggestions on the diagnosis of this problem and what could be wrong before I start throwing parts at the car?
Thank you,
This is my first MB. I took the car to inspection yesterday and it failed for rear right turn signal not working. I was aware of some issues with the car when I bought it like needing brakes, etc. The dash was showing "brake wear" and "left brake lamp" warnings. They both went away at the same time after I replaced the brakes. Then no warning messages appeared except a check engine light and a tire pressure warning.
I took the car to inspection and the right turn signal light is not working. After taking the car back home, the "brake wear" and "left brake lamp" warnings showed up again on the dash.
I replaced the turn signal bulb, but that was not the problem. I did some research and now suspecting the SAM. I was not sure of the location so I did more research and found that it was on the right side under the fuse box. I took it off to replace it but after doing even more research, I am finding that the new one needs to be programmed after installation.
Any suggestions on the diagnosis of this problem and what could be wrong before I start throwing parts at the car?
Thank you,
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Is it the left rear turn signal or is it the left front signal or is it both?
When you replaced the brakes (front or rear or both), did you replace the Brake Wear Sensor? Read highlighted area in PDF.
When you replaced the brakes (front or rear or both), did you replace the Brake Wear Sensor? Read highlighted area in PDF.
Thread Starter
Newbie
Joined: Jul 2021
Posts: 2
Likes: 0
2009 Mercedes Benz ML320 BluTec
It is the right rear turn signal. The dash is not showing that there is a problem with it, but it is showing that the rear left brake lamp is not working. The problem is intermittent.
I did not replace the brake sensor because I was not aware of what's there so I only ordered the brakes. I removed the sensors from the old pads and installed them on the new pads. Everything worked after I replaced the brakes for a couple of days then when I took the car to get it inspected, this happened.
I am suspecting the SAM because the problem is intermittent and I did not notice any damage when I took the rear taillight assembly off. No damage to the socket and the bulb is not burnt. I replaced the bulb, and it did not work.
I did not replace the brake sensor because I was not aware of what's there so I only ordered the brakes. I removed the sensors from the old pads and installed them on the new pads. Everything worked after I replaced the brakes for a couple of days then when I took the car to get it inspected, this happened.
I am suspecting the SAM because the problem is intermittent and I did not notice any damage when I took the rear taillight assembly off. No damage to the socket and the bulb is not burnt. I replaced the bulb, and it did not work.
Member
Joined: Apr 2017
Posts: 219
Likes: 24
From: UK
ML420 W164 (2009)
Take your rear SAM out of the car and remove it from its case. Carefully, clean both sides of the circuit board with an old toothbrush and iso-alcohol. Remove all traces of corrosion.
Leave it to dry for a while, reassemble and cross your fingers!
Leave it to dry for a while, reassemble and cross your fingers!
