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-   -   FCW & ACC - Too Sensitive? (http://www.jeepgarage.org/f107/fcw-and-acc-too-sensitive-34614.html)

bmrisko 01-24-2012 08:36 AM

FCW & ACC - Too Sensitive?
 
My wife has complained to me a few times about this while driving the Jeep, so I figured I'd see if it is a widespread problem or if maybe our sensor is mis-adjusted. She uses ACC while on the way to work as there are long stretches of 3-lanes (1 each direction + turn) with not much traffic early in the morning, but speed limit heavily monitored. Occasionally there are cars stopped in the turn lane going the same direction as her and she says when she approaches these vehicles, the FCW will kick in and the ACC will automatically slow down. The car sitting in the turn lane is no where close to being in her lane. Has anyone else experienced this issue?

I have never had this problem using ACC on the interstate and approaching slow moving vehicles in lanes next to me, but I am wondering if maybe the sensor can tell if cars are moving your direction or the opposite direction (as this doesn't happen on true 2-lane roads either) vs. stopped in a turn lane?

EDIT: She said she has tried ACC in 1, 2 and 3 and still gets the same results, only when approaching a stopped vehicle in the center turn lane.

77Cherokee 01-24-2012 10:04 AM

Re: FCW & ACC - Too Sensitive?
 
The FCW and ACC are designed to measure your speed vs. the distance to an object directly in front of the vehicle. If it detects that your foot is off the brake and a collision is imminent, the FCW will warn you, whereas the ACC will just slow the vehicle down. If there is a curve in the road, the system can possibly send a false warning. On a straight road, with no objects directly in front it should not do this. You should have the sensor checked and possibly aimed by the dealer.

bmrisko 01-24-2012 10:16 AM

Re: FCW & ACC - Too Sensitive?
 
Quote:

Originally Posted by 77Cherokee (Post 559449)
On a straight road, with no objects directly in front it should not do this. You should have the sensor checked and possibly aimed by the dealer.

Thanks, that is kind of what I was thinking. I have had false warnings before from the FCW on roads w/ curves, but have never experienced it come on while on straight roads, but then again, I have never come up on someone stopped in a lane to my left whereas my wife apparently encounters this situation more frequently on her morning commutes.


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