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  #1  
Old 12-04-2015, 01:35 PM
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Dirty ACC sensor - best cleaning method?

All,

Intermediate term lurker, first time poster. Recently moved to Denver from Dallas over this past summer. In the move (car was flatbeded) my ACC (adaptive cruise control) sensor became dirty and has since displayed a message as such, thus disabling the ACC. I've driven my Jeep sparingly since moving here, a few light off-road adventures, and have tried cleaning the sensor 3x with no success.

Does anyone have any advice on how best to clean this? I'm considering removing the unit this weekend. Really need cruise control as I'm driving to/from Dallas in 3 weeks.

Thanks!

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  #2  
Old 12-04-2015, 01:50 PM
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Re: Dirty ACC sensor - best cleaning method?

Have you cleaned the upper center of your windshield, where one of the sensors is fitted into the rear view mirror module?
I use Invisible glass to clean my windshield.

Have you checked that the bottom sensor is firmly in place?
If it is, I clean my bottom sensor with dish soap first (dawn) and then with Invisible glass.

If you've done all the above and still have the issue, take it back to the dealer and have them check it out under warranty.
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Old 12-04-2015, 02:57 PM
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Re: Dirty ACC sensor - best cleaning method?

Quote:
Originally Posted by philbytx View Post
Have you cleaned the upper center of your windshield, where one of the sensors is fitted into the rear view mirror module?
I use Invisible glass to clean my windshield.

Have you checked that the bottom sensor is firmly in place?
If it is, I clean my bottom sensor with dish soap first (dawn) and then with Invisible glass.

If you've done all the above and still have the issue, take it back to the dealer and have them check it out under warranty.
The ACC sensor down on the front of the car is quite easy to clean [even rain works] and is rarely a problem even around Denver unless we get hit with freezing rain/slushy snow.

You can use a glass wipe, a bit of windshield washer fluid, etc.

I usually avoid Windex or similar as I'd be worried the ammonia in them might corrode something.

Clean everything, but check that front lens on the big sensor to see if it is at all loose, folks here have had issues with it.

You don't really need ACC, and you should be able to use the old fashioned cruise control even if ACC is disabled because it thinks it is dirty.
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Old 12-04-2015, 03:54 PM
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Re: Dirty ACC sensor - best cleaning method?

Quote:
Originally Posted by lstowell View Post
The ACC sensor down on the front of the car is quite easy to clean [even rain works] and is rarely a problem even around Denver unless we get hit with freezing rain/slushy snow.

You can use a glass wipe, a bit of windshield washer fluid, etc.

I usually avoid Windex or similar as I'd be worried the ammonia in them might corrode something.

Clean everything, but check that front lens on the big sensor to see if it is at all loose, folks here have had issues with it.

You don't really need ACC, and you should be able to use the old fashioned cruise control even if ACC is disabled because it thinks it is dirty.
Interesting, I'll give cruise control another shot. Since I drove mostly city streets I haven't tried it much, but thought it was giving me an error when trying to set it due to the dirty sensor. I got a good dose of New Mexican dirt on my car when driving on a muddy road in the mountains outside of Taos. To/from Stapleton/Downtown doesn't give me many chances to get it dirty.

Thanks for the cleaning tips - I'll give it another go and also check the connection.

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Old 12-05-2015, 09:29 PM
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Re: Dirty ACC sensor - best cleaning method?

Definitely don't remove the sensor. It's right there in plain view, just wipe it down with anything you want, nothing special about it.
The windshield sensors as far as I know have nothing to do with ACC. Just rain sensing wipers and auto high beams.
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Old 12-05-2015, 11:27 PM
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Re: Dirty ACC sensor - best cleaning method?

Wet Wipes
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Old 12-06-2015, 01:45 PM
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Re: Dirty ACC sensor - best cleaning method?

Quote:
Originally Posted by JTS97Z28 View Post
Definitely don't remove the sensor. It's right there in plain view, just wipe it down with anything you want, nothing special about it.
The windshield sensors as far as I know have nothing to do with ACC. Just rain sensing wipers and auto high beams.
The windshield camera is used by ACC/FCW. Just the other day when driving down backroads in heavy snow, I got the warning "ACC/FCW Limited Functionality - Clean Front Windshield" when snow started to build up over the camera.
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Old 12-07-2015, 05:26 PM
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Re: Dirty ACC sensor - best cleaning method?

Quote:
Originally Posted by f1anatic View Post
Wet Wipes
Wet wipes followed by Zeiss lens cleaner, agreed.
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Old 12-07-2015, 06:09 PM
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Re: Dirty ACC sensor - best cleaning method?

Quote:
Originally Posted by MBDiesel View Post
The windshield camera is used by ACC/FCW. Just the other day when driving down backroads in heavy snow, I got the warning "ACC/FCW Limited Functionality - Clean Front Windshield" when snow started to build up over the camera.
Humm, are you 100% sure about this? I was under the impression the ACC/FCW was all from the "eyeball" sensor in the lower front bumper.
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Old 12-08-2015, 02:02 AM
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Re: Dirty ACC sensor - best cleaning method?

Quote:
Originally Posted by JTS97Z28 View Post
Humm, are you 100% sure about this? I was under the impression the ACC/FCW was all from the "eyeball" sensor in the lower front bumper.
Took a gander over at wk2jeeps.com and found:

Quote:
Radar/Camera Fusion
To reduce the number of false positives in previous systems, Chrysler has integrated Forward Facing Camera information with radar information to improve the robustness of the system.
- These improvements include redundant information to confirm automatic braking on stationary licensable vehicles which are classified as Cars, Trucks, Motorcycles, and Trailers.
- The forward collision warning system will still provide an audible/visual warning only on stationary objects which are not classified as vehicles if the conditions are met.
- Automatic Braking will be provided on moving objects with Radar only classification. This is the same amount of braking as maximum ACC braking.
Radar unit is under the bumper, camera is on the windshield behind the rear view mirror.
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