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Old 02-18-2018, 04:19 PM   #1
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2017 Interstate Grand Tour Ext
Fort Lauderdale , Florida
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Mystery random single dash tone

Took our 2017 AI out for a day trip today. Second time out putting a few miles on since the purchase last month. Love driving this thing - except.

I am getting a mystery warning tone from the dash. It is a single warning beep. It occurs randomly at all speeds in varying conditions. On the highway it occurred every 10 or 15 minutes. At varrying speeds. No messages on the dash. No lights. I check the mirrors trying to tie it to the blind spot detector but not pattern there. Everytime I hear the tone I search the dash and mirrors looking for a connection. On the way home at 25 MPH in city traffic it occurred 3 times in three minutes. On a 4 hour drive I am guessing that the tone went off 30 times.

Check the Mercedes manual but nothing summarizes warning tones. Did not find any past posts on the topic.

Any guesses?
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Old 02-18-2018, 04:31 PM   #2
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Sounds like you have the lane-following warning turned on and wandered into a lane line.

I get some spurious lane warnings when the camera thinks it sees a line that isn't there or the remains of earlier lines.

You should get a warning on the dash for a few seconds when you wander into a line. Sort of an odd-shaped symbol.
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Old 02-18-2018, 04:43 PM   #3
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I had a warning sound like yours when someone overfilled my crankcase with oil.
Not good to use too much oil. Removed some oil and it never returned. AEW
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Old 02-18-2018, 05:01 PM   #4
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If it is a single beep that then repeats then at some point just stops, it might be what has plagued many of us... the awning "sail" sensor. Send the awning out a few inches then retract it and it should stop. Supposedly this is being "fixed" on mine right now.
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Old 02-18-2018, 05:32 PM   #5
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My experience is the in-dash GPS will "bing" when it identifies it location. My area has several new roads, when driving the new road and cross a known road the GPS will bing. I assume to inform of location found...
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Old 02-18-2018, 05:43 PM   #6
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I also think it comes from the GPS. Ours will flash up a short warning in school zones.
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Old 02-19-2018, 03:54 AM   #7
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Thank all,

1. Familiar with the lane warning and the light on the dash. I recall the tone being a different sound and the light on the dash is not lit.
2. Oil fill is interesting - will check.
3. GPS was not in a route.
4. Awning sensor? I did not know there was one. In fact, when I parked the vehicle at home last night I put the awning in the full open position. Then I realized I was too close to the edge of my drive way. I slowly drove 10' forward and then back to move over. All with the awning fully deployed and no warning sensors or tones.
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Old 02-19-2018, 07:42 AM   #8
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Our GPS does not need to be in the route mode to beep. Have your passenger look at the GPS screen when you hear the beep. The message just flashes on for a very short time.
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Old 02-19-2018, 08:01 AM   #9
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I too had an oil overfull ding, but it was accompanied with a message on the dash display. It only happened after hours of driving under very hot conditions. Oil expanded just enough as it heated up to trigger it? I shut the engine off an waited a few minutes then checked it via the dipstick. It was at the very top, but did not appear to be overfull. I figured the sensor was mounted to low (assuming the dipstick was right). When I got home I siphoned about a cup out of the dipstick tube - not easy but possible when the oil is warm - and never agin got the dong or message. Oil level too high will let the crankshaft dip into the oil sump and cause a frothy foamy mess of the oil - interfering with the ability to pump it. Not a good thing to have happen!
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Old 02-19-2018, 08:59 AM   #10
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Quote:
Originally Posted by Land Stitchy View Post
Thank all,

1. Familiar with the lane warning and the light on the dash. I recall the tone being a different sound and the light on the dash is not lit.
2. Oil fill is interesting - will check.
3. GPS was not in a route.
4. Awning sensor? I did not know there was one. In fact, when I parked the vehicle at home last night I put the awning in the full open position. Then I realized I was too close to the edge of my drive way. I slowly drove 10' forward and then back to move over. All with the awning fully deployed and no warning sensors or tones.

The awning sail sensor for me would go beeping only with the awning retracted. Once when we were driving on the freeway and got a big side gust of wind and 3-4x when I parked and turned off the ignition.
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Old 02-19-2018, 09:06 AM   #11
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I had the awning sensor go off while driving in a strong crosswind in west Texas. Rolling the awning out a foot and retracting it fixed the problem to date.

The awning alarm is a very high pitch and without much volume. I can hear it, but my wife can't. I may replace the beeper with a healthier alarm.
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Old 02-19-2018, 10:08 AM   #12
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Ours does that also - GPS routing does not have to be on. Watch the very top of your Fusion screen and you may see a quick flash of either a school zone or changes of speed. Seems to be when we've noticed it most.
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Old 02-19-2018, 11:29 AM   #13
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Will check out the GPS idea. That seems the most logical. We had the CD player screen up the whole time we were driving and did not look at the GPS.
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Old 02-19-2018, 04:17 PM   #14
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I just returned from a trip in my new 2018 and I got periodic warnings with a sound that I was approaching a new speed zone, etc. there is a quick explanation on the screen but. Only for a few seconds.
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