Posted 06 November 2016 - 04:25 PM
Well, I asked at the dealer. Sales guy has 20+ years Ford - fleet and consumer - with an electronics degree. Knows how the ACC works. Also talked with a service tech who actually does the work on vehicles needing it. Here's how it works - in general. Remember, this is ACC with Stop/Go Technology - a '17 FFH. So the implementation may be different from prior years.
ACC is essentially a radar (or sonar) system that has a gun (transmitter) and receivers (sensors). The gun is behind the grille blocker in the upper grille area. The front faschia has 4 sensors - 2 outboard near the corner and 2 inboard bracketing the license area.
The front sensors comprise the collision warning system, proximity warning when parking and receivers for ACC. Probably other stuff as well. The inboard sensors are the ACC receivers in addition to other duties. In my original post, it was these that were crudded up with snow/slush pack - and that prevented the signal from getting received. Thus the error message I got. Simple stop/start of the car would not have fixed the issue but the cleanoff did.
What can be used to prevent or alleviate heavy build-up like that? A good coat of wax is all any of us can come up with. So I'll get some Rain-X stuff and have it handy to see if it helps. <shrug>
Edited by Cobra348, 06 November 2016 - 04:26 PM.
Larry - aka Cobra
Big Red: 2017 FFH SE, Ruby Red, Med Light Stone leather
602A SE Luxury Package, Park Assist, Adaptive Cruise Control w/stop & go
Driver Assist Pkg (lane keeping, BLIS, auto high beams, auto wipers, heated steering wheel)
My additions: WeatherTech lasercut floor mats, in-channel wind deflectors (dark smoked)
Steeda strut tower brace, Steeda rear sway bar, Steeda hood struts, Ford donut spare
Summer rims/tires - 17" Verde Regency rims with OEM tread
Winter rims/tires - 17" OEM rims with Goodyear UltraGrip WRT Ice