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Old 12-20-2012, 08:22 PM   #1 (permalink)
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Collision Braking (CMBS) sensor covered with snow, goes into Alarm

First snow in Chicago with my 2013 MDX and the CMBS system goes into alarm saying the sensor in the grill (Emblem??) is covered up and can't work

Duh, it's snowing and snow covers the grill and apparently the sensor

Anyone else experience this???
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Old 12-20-2012, 09:51 PM   #2 (permalink)
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The duh answer is to keep cleaning it, I don't see any other way around.


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Old 12-21-2012, 06:00 AM   #3 (permalink)
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The duh answer is to keep cleaning it, I don't see any other way around.


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It's going to be hard to keep it clean while driving unless you mount a windshield wiper to it. I just think its in a bad location.
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Old 12-21-2012, 08:33 AM   #4 (permalink)
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If you turn off CMBS does the alarm go away? It seems that the CMBS is aggresive in braking and that is NOT what you want when driving in the snow anyway.
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Old 12-21-2012, 12:44 PM   #5 (permalink)
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agree with the idea of turning off, but bottom line is poor placement I think

Thanks for the replies
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Old 12-21-2012, 01:24 PM   #6 (permalink)
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agree with the idea of turning off, but bottom line is poor placement I think

Thanks for the replies
I agree that it is a bit obvious, other cars have ACC or CMBS but I have never noticed the big plastic sheild on anything except Acura's. It is, however, the easy method of determining the Advance model.
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Old 12-21-2012, 03:12 PM   #7 (permalink)
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All car I've seen have placed their sensors in a similar spot, so I assume thy also have the same kind of problems.


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Old 12-21-2012, 11:26 PM   #8 (permalink)
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I wouldn't say it's a poor design at all. The sensor is optimally aligned to provide best performance to help the driver avoid a collision. Manufacturers aren't going to mount the sensor any higher as that would result in a steep angle, significant variability, and reduced performance.

If snow is an issue in your area, we've had good results with applying Ice Free to our windshields/windows/mirrors and maintaining it regularly. It's derived from NASA tech that prevents ice from bonding to the glass or plastic.

The CMBS from any manufacturer is ideal for rough weather conditions as the systems can communicate to the driver how to drive when fog/storm/snow/etc conditions are present.
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Old 12-22-2012, 11:30 AM   #9 (permalink)
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Silly question, was it covered while driving? Or was it covered after being parked?


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Old 12-28-2012, 04:38 PM   #10 (permalink)
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sorry for late reply

It was clear from the start, but snow accumulated while driving and cmbs went into alarm

Cleaned off when parked, but same problem on return trip in snow

Dealer says normal situation, turn off during wet snow

Not optimal, but that's dealer advice
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Old 12-28-2012, 05:23 PM   #11 (permalink)
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I kind of have to agree with the dealer, or you can keep cleaning it until it becomes annoying.


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Old 01-16-2013, 10:24 PM   #12 (permalink)
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Mine did the same thing on a trip to Chicago as well & it wasn't even snowing that hard. Can't say I was too impressed with the design, but love the CMBS system otherwise. I guess we just have to take the bad w/ the good. Just hope I don't really need it when it's snowing!
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Old 01-17-2013, 12:51 AM   #13 (permalink)
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It seems that the CMBS is aggresive in braking and that is NOT what you want when driving in the snow anyway.
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Old 01-17-2013, 11:12 AM   #14 (permalink)
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All these high-end sensors will need to be disabled when driving in many bad weather conditions or bad driving conditions. i.e. off-roading, snowing, etc.

This is the same situation in practically all vehicles with these high-end features.

Even the ABS, etc brakes may fail if you are off-roading and certain type of mud/rocks/debree gets in between the sensors.

When in deep snow, sand, mud, etc. you should turn off the stability control to avoid the computer to cut off engine power to the wheels.

The collision options should only be used on highways/roads and on normal conditions and not in extreme conditions. It is radar based so it is obvious that anything that obstructs the radar waves will affect this feature.

In some SUV's with low range options (for mud, snow, sand, ice, etc) the disabling or tuning off of these features is done automatically since the low range is designed for off-road conditions and the vehicle will know it does not want certain features on or at full sensitivity. In our case, we don't have low-range features, so we have to do this manually. There is no easy way for sensors and computers to determine the weather and road types so it relies on the driver to turn on/off certain features.

I don't think anybody will expect radar based features, stability control features, cameras, etc. to work in all muddy, ice/snow, and extreme weather conditions. Some of these features work like the rear view camera or even the HID lights, you will need to clean the sensors/devices-IO areas so that they can receive/emit the proper information and process the information correctly.

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