GL Class (X166) 2013-2015 after facelift became GLS (X166)

Distance warning on GL350

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Old 06-12-2019, 11:53 PM
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Distance warning on GL350

Hi there, I'm new to MB. My 2014 GL350 doesn't seem to have Distronic plus package. However the Distance Warning option is enabled on my 2014 GL350. When engine starts it shows this symbol OFF, for a few seconds. And the cruise control doesn't automatically slow down when approaching front vehicle. But I recall it worked before.It doesn't seem to give warning when getting very close to front vehicle. I think it's an issue with the distronic radar sensor? Thanks.
Old 06-13-2019, 01:05 AM
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Gee... this link will let your download your Owners Manual: CLICK HERE OWNERS MANUAL DOWNLOAD

Check under Collision Prevention Assist (Alert)
Old 06-13-2019, 02:58 PM
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Originally Posted by fabbrisd1
Gee... this link will let your download your Owners Manual: CLICK HERE OWNERS MANUAL DOWNLOAD

Check under Collision Prevention Assist (Alert)
Yes I've read the manual, but that doesn't help with my question. Like I mentioned earlier, the Distance warning is set to Enabled, but when engine starts the symbol shows up for a few seconds, which means something not right. And when fast approaching front vehicle it doesn't give warning in regular driving, or doesn't slow down in Cruise control mode. I'm trying to see if anyone knows which sensor causes this issue, and also where such sensor is located.
Old 06-13-2019, 03:38 PM
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could be a bulb test...

Try turning it off and see if that symbol does not come on.
Old 06-13-2019, 07:13 PM
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It's not a sensor issue - that part of the manual describes the function of Collision Prevention Assist - which is a emergency alert - and NOT Distronic function.

Under "normal" driving - you would tend NOT to set off Collision Prevention Assist - which is a beep/beep alert - it is NOT Distronic - it does NOT slow you down in Cruise Control - etc.

If the sensor was inoperative - the dash would give you a error message
Old 06-13-2019, 09:00 PM
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Originally Posted by ygmn
could be a bulb test...

Try turning it off and see if that symbol does not come on.
That OFF symbol comes up every time engine starts.
Old 06-13-2019, 09:07 PM
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Originally Posted by fabbrisd1
It's not a sensor issue - that part of the manual describes the function of Collision Prevention Assist - which is a emergency alert - and NOT Distronic function.

Under "normal" driving - you would tend NOT to set off Collision Prevention Assist - which is a beep/beep alert - it is NOT Distronic - it does NOT slow you down in Cruise Control - etc.

If the sensor was inoperative - the dash would give you a error message
If that's the case, how would you explain the OFF symbol comes on every time, while Distance warning is enabled? It should only show up when Distance warning is disabled according to the manual.
Also, it happened at a few random times that there was no vehicle close in front but the triangle red alert came up in speedometer window, along with alarm sound.
If the Distance warning doesn't slow down in cruise driving, what does?
I'm getting more confused.
Old 06-13-2019, 09:10 PM
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Originally Posted by Flever
If the Distance warning doesn't slow down in cruise driving, what does?
Nothing.

The driver controls speed when using cruise control on vehicles without Distronic.
Old 06-14-2019, 12:16 AM
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Originally Posted by cadetdrivr
Nothing.

The driver controls speed when using cruise control on vehicles without Distronic.
I'm not sure how you know it's without Distronic. I believe it has Distronic as it was able to automatically slow down or accelerate to just follow front car speed before. And that OFF symbol wasn't coming up before. All those issues started at the same time later on.
Old 06-14-2019, 07:35 AM
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Originally Posted by Flever
I'm not sure how you know it's without Distronic..
I just read your first sentence in your first post of this thread where you said you don’t have it.

Hopefully you have a windows sticker or data sheet with the installed options.

if not, put your VIN into this websoste:

https://www.datamb.com/

Last edited by cadetdrivr; 06-14-2019 at 07:39 AM.
Old 06-14-2019, 07:37 AM
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Deleted, duplicate

Last edited by cadetdrivr; 06-14-2019 at 08:50 AM. Reason: Duplicate post
Old 06-14-2019, 10:47 PM
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Originally Posted by cadetdrivr
I just read your first sentence in your first post of this thread where you said you don’t have it.

Hopefully you have a windows sticker or data sheet with the installed options.

if not, put your VIN into this websoste:

https://www.datamb.com/
OK thanks for the info. I checked on that web site, and it doesn't show Distronic package. If the details from that website is accurate, it just has Collision prevention and Distance warning, no adaptive cruise.
Hmm. But I still wonder why this sign comes up every time engine starts. It should mean Distance/Collision warning is off, but it is set to Enabled.
Old 06-15-2019, 04:17 AM
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Yes - the "Off" symbol come up when you start the car up while that system initiates itself and you get the GL in gear and moving...
Old 06-15-2019, 09:31 AM
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always observed this light/symbol as collision avoidance and do not believe it correlates to distronic ... it's worked for me on many occasions (sometimes incorrectly) ... your front peripheral sensors are constantly active and sending out signals ... in the "normal" course of driving, the computer uses the sensors to analyze if something in front of the vehicle is "not" in the normal course of driving ... for instance, cruising at 45mph and it detects say for instance a car immediately in front is NOT cruising at comparable speed (say 15mph) and as the two vehicles narrows the gap, the audible and visual alert comes on ... and Boom ... I like it 95% of the time b/c it's accurate 5% of the time it miscalculates ... say a protruding branch into the road or a perpendicular car encroaching too much into your lane, waiting to make a turn after you pass ... :-)
Old 06-17-2019, 05:38 PM
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If your grille has the solid, flat Mercedes star, then you have Distronic+.

Old 06-18-2019, 06:25 PM
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OP, have you checked to see if it's turned off?

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