No Turn Signals + Blind Spot & Lane Keep Assist Unavailable
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Junior Member
Joined: Feb 2021
Posts: 68
Likes: 12
2013 GL550
No Turn Signals + Active Blind Spot & Lane Keep Assist Inoperative
SYMPTOMS:
REMEDIATIONS (already tried):
RESULT: original symptoms persist.
DISCUSSION: I've read anecdotal reports of this combination of symptoms indicating a problem with the blind spot radar sensors in the rear bumper (water damage from broken casing). See this MercedesMedic link.
QUESTION: Has anyone else had this problem? If so, what was the cause and your solution?
EDIT: I'm pretty sure this is a turn signal module problem (described here).
- Periodic "Active Blind Spot Assist Inoperative" and "Active Lane Keep Assist Inoperative" warning messages.
- Periodic loss of turn signals
REMEDIATIONS (already tried):
- Cleaning front and rear parking sensors
- Cleaning front-facing camera
- Replacing broken front star emblem (part #164-888-04-11)
RESULT: original symptoms persist.
DISCUSSION: I've read anecdotal reports of this combination of symptoms indicating a problem with the blind spot radar sensors in the rear bumper (water damage from broken casing). See this MercedesMedic link.
QUESTION: Has anyone else had this problem? If so, what was the cause and your solution?
EDIT: I'm pretty sure this is a turn signal module problem (described here).
Last edited by Jason Stewart; Mar 20, 2022 at 07:39 AM.
Senior Member
Joined: Jan 2015
Posts: 306
Likes: 78
gl450
Take a look at this thread - same symptoms, required replacement of the combination switch.
https://mbworld.org/forums/gl-class-...acting-up.html
https://mbworld.org/forums/gl-class-...acting-up.html
Junior Member
Joined: May 2021
Posts: 22
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GL450
Replace your SAM (Signal Acquistion Module)
I had the same symptoms on my 2012 GL450. Turn signals, blind spot and fuel gauge inoperative. I found the reason as to why it failed as well. If the rear windows are left opened and it rains, water will enter the vehicle and soak the SAM that resides at the rear right tail light. Always make sure the windows are closed (lowest switch on the driver window switch panel) when exiting the vehicle. The switch is easily bumped when driving. The new module will have to be programmed by MB for all systems controlled by the module.
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Joined: Oct 2009
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From: Colorado
'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
So the lesson is - if your feet get wet every time you get in your car, be sure to check your taillight - just sayin'.
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From: In my garage
E55, GLS450, GL63, GLE350
There is a difference between sitting in water, what I said, and being immersed in water. With that said, I have had a SAM almost covered in water and, yes, it was gallons but was from leaving the window open. Very expensive mistake.
MBWorld Fanatic!
Joined: Oct 2009
Posts: 7,001
Likes: 2,195
From: Colorado
'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
In this case I am having trouble visualizing the waterway from door to rear quarter, where the SAM resides. Is the rear quarter window operable (I don't have a GLS)?
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From: New Orleans
2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
Had it in the beginning. There is a steering wheel control module which cause turn signals to disappear...
Similar case
https://mbworld.org/forums/gl-class-...noperable.html
Similar case
https://mbworld.org/forums/gl-class-...noperable.html
MBWorld Fanatic!
Joined: Aug 2003
Posts: 8,882
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From: In my garage
E55, GLS450, GL63, GLE350
Thread Starter
Junior Member
Joined: Feb 2021
Posts: 68
Likes: 12
2013 GL550
Thread Starter
Junior Member
Joined: Feb 2021
Posts: 68
Likes: 12
2013 GL550
Fixed?
This is strange, but I found that when I get the “Active Blindspot assist inoperative“ or “Active Lane keeping assist in operative” messages (and those systems stop working) that they will immediately start working again if I just turn on the right turn signal then the left turn signal (in quick succession) while the vehicle is in Drive (D).
I’m still not sure what the root cause of this problem is, but this interim fix is unobtrusive enough that I think I can stretch out my next dealer appointment.
I’m still not sure what the root cause of this problem is, but this interim fix is unobtrusive enough that I think I can stretch out my next dealer appointment.
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Joined: Apr 2022
Posts: 2
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ml500
This is strange, but I found that when I get the “Active Blindspot assist inoperative“ or “Active Lane keeping assist in operative” messages (and those systems stop working) that they will immediately start working again if I just turn on the right turn signal then the left turn signal (in quick succession) while the vehicle is in Drive (D).
I’m still not sure what the root cause of this problem is, but this interim fix is unobtrusive enough that I think I can stretch out my next dealer appointment.
I’m still not sure what the root cause of this problem is, but this interim fix is unobtrusive enough that I think I can stretch out my next dealer appointment.
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