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  #13  
Old 07-12-2011, 02:59 PM
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Re: ACC and Brake Lights

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Originally Posted by robpp View Post
actually i have been doing some research and the system, if it uses the brakes, should be illuminating the brake lights, according to the NHTSA.

not when its coasting or free wheeling per se, only if it applies the brakes then it should flash the lights on.

that was the main part of my angst.......no brake lights but it seems as if it does this., or should/ some early versions, other makers, lincoln is one, did NOT light the lights and then had to change that once it became apparent.

and yes I guess reaction time feeds into it......
if the puter hits the brakes hard the person following may not have proper time to ever stop unless the lights come on....
if its just not accelerating and coasting thenm the follower would have all sorts of reaction time/ like an older manual cc
I haven't come across any specific language in the manual that talks about how the brake lights react when ACC is engaged. Would be nice to know if anyone has the facts on the GC's ACC system.
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  #14  
Old 07-12-2011, 03:03 PM
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Re: ACC and Brake Lights

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Originally Posted by 2005JGC View Post
numerous hard wired inputs including the brake (or stop) lamp switch
An "input" is a sensor, not a control. The quoted text says that the ACC monitors, among other things, whether the driver has pushed the brake pedal far enough to activate the brake light.
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  #15  
Old 07-12-2011, 03:07 PM
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Re: ACC and Brake Lights

he he... touche... that would be me looking for a specific set of words and ignoring others... be happy I quoted the text and didnt just paraphrase what I WANTED it to mean
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  #16  
Old 07-12-2011, 03:08 PM
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Re: ACC and Brake Lights

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Originally Posted by 2005JGC View Post
This is via dealerconnect on adaptive cruise control operation.... Again I am fairly certain there there is a deceleration threshold that when the vehicle is commanded to slow outside of that threshold that legally a vehicle must notify drivers behind. Very different but similar to the anti sway control I mentioned.

I think what you are saying is correct. in my post right above this I said i read the NHTSA says it should light if it uses the brakes......and it did mention some time threshold. otherwise the liht may be flashing for other brake usage by the 'puter no matter duration/
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Old 07-12-2011, 03:20 PM
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Re: ACC and Brake Lights

Yeah, I saw that... I was in post process before that was actually posted so it showed up after I posted. your good.
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  #18  
Old 07-12-2011, 03:56 PM
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Re: ACC and Brake Lights

Ok so are we clear on this because it's freaking me out.

When the ACC has to stop hard enough for to apply braking, does it IN FACT cause the brake lights to go on??

If not, then I'm not using it anymore.

Thanks,
-Ryan
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Old 07-13-2011, 02:59 AM
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Re: ACC and Brake Lights

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Originally Posted by robpp View Post
actually i have been doing some research and the system, if it uses the brakes, should be illuminating the brake lights, according to the NHTSA.
As Rob deturmined in his research, YES... If the vehicle decelerates quickly enough (what rob posted was simply application of brakes PERIOD) your brake lights will come on.
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  #20  
Old 07-13-2011, 09:04 AM
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Re: ACC and Brake Lights

This is taken from the WK2 owners manual, the ACC will only use a max of 25% braking:
The maximum braking applied by ACC is limited; however,
the driver can always apply the brakes manually, if
necessary.
NOTE: The brake lights will illuminate whenever the
ACC system applies the brakes.
AProximityWarning will alert the driver if ACC predicts
that its maximum braking level is not sufficient to
maintain the set distance. If this occurs, a visual alert
“BRAKE” will flash in the EVIC and a chime will sound
while ACC continues to apply its maximum braking
capacity. When this occurs, you should immediately
apply the brakes as needed to maintain a safe distance
from the vehicle ahead.
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  #21  
Old 07-13-2011, 11:57 AM
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Re: ACC and Brake Lights

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Originally Posted by Dan JGC View Post
As I understand it, the brake light only comes on when the brake is applied...just like driving...but not when less accelerator or downshifting...just like driving.
I thought I answered this question in post #2 above...
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Old 07-13-2011, 04:06 PM
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Re: ACC and Brake Lights

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Originally Posted by Dan JGC View Post
I thought I answered this question in post #2 above...
You did, but then there seemed to be some potential disagreement

-Ryan
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  #23  
Old 07-13-2011, 04:30 PM
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Re: ACC and Brake Lights

I used ACC for the first time today. That is really cool!!! It worked perfectly. I never liked cruise control before, now I really like it.
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