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Old 09-08-2015, 11:25 AM
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Question Auto headlights coming on to early (not dark)

Hi,

I have a 3 day old Grand Cherokee 2015 UK version and I updated to the latest uconnect s/w today.

Since doing this I have noticed the auto headlights want to come on when it gets overcast and cloudy, they seem to stay on forever.

I was surprised they came on as no other car on the roads had their lights on and even cars I would be sure of having auto lights were not on either.

Is there any tweak that can adjust or change the sensativity of this, I dont mind them coming on when it gets dark or dusk, but just cloudy seems excessive.

Thanks guys.

BizBo

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  #2  
Old 09-08-2015, 12:20 PM
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Re: Auto headlights coming on to early (not dark)

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Originally Posted by BizBo View Post
Hi,

I have a 3 day old Grand Cherokee 2015 UK version and I updated to the latest uconnect s/w today.

Since doing this I have noticed the auto headlights want to come on when it gets overcast and cloudy, they seem to stay on forever.

I was surprised they came on as no other car on the roads had their lights on and even cars I would be sure of having auto lights were not on either.

Is there any tweak that can adjust or change the sensativity of this, I dont mind them coming on when it gets dark or dusk, but just cloudy seems excessive.

Thanks guys.

BizBo
Several things can affect when the headlights actually trigger to come on:

1) The most obvious one is it's getting dark or not very light yet. They should trigger on at dusk and turn off shortly after dawn. The idea is to have them on during periods when contrast is low, but its still not yet dark (or not fully light). Those (along with sunrise and sunset, when the sun is in peoples eyes) are the times when the most failure to yield accidents occur.

2) Heavy cloud cover or dark rain clouds can fool the sensor into tripping the lights on.

3) Trees overhanging the road or otherwise creating shade can trigger the lights.

4) The direction you are heading in when any of the above conditions may apply. Heading away from the sun so the roof blocks some of the light can amplify already dim conditions. That can be why your lights might come on, but oncoming traffic lights won't.

5) Turning your wipers on. I don't know about the UK, but US models will turn the lights on when the wipers are on in either full or delay modes to comply with "Wipers on/Lights on" laws in some states.

6) Things on the dash near or covering the sensor can also fool it.
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Old 09-08-2015, 02:24 PM
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Re: Auto headlights coming on to early (not dark)

My 14 headlights came on too soon, even traveling under a row of shade trees. It doesn't really hurt anything, but would prefer the sensitivity be adjustable like on my Acura.


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Old 09-08-2015, 06:09 PM
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Re: Auto headlights coming on to early (not dark)

I just do mine manual, driving into the city, every highway underpass, the lights come on quickly, and as mention take about a minute in sunlight to shut back off
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Old 09-09-2015, 02:12 PM
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Re: Auto headlights coming on to early (not dark)

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I just do mine manual, driving into the city, every highway underpass, the lights come on quickly, and as mention take about a minute in sunlight to shut back off
That doesn't sound right at all.

There should be a delay that prevents them from coming on just by passing under bridges and such. The delay to turn back off should be much shorter, like well under 30 seconds.

It sounds like the delays are backward on your Jeep.
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Old 09-09-2015, 02:17 PM
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Re: Auto headlights coming on to early (not dark)

I realize I'm talking about an older GC here, but part of my commute home takes me through a tunnel, and I would say I'm about average compared to other vehicles.

Depending on speed seems like most peoples lights come on about half or 3/4 the way through the tunnel. I'm usually about the same as other vehicles.

If anything wish they were more sensitive and came on earlier...
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Old 09-09-2015, 02:24 PM
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Re: Auto headlights coming on to early (not dark)

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Originally Posted by WickedXJ View Post
I realize I'm talking about an older GC here, but part of my commute home takes me through a tunnel, and I would say I'm about average compared to other vehicles.

Depending on speed seems like most peoples lights come on about half or 3/4 the way through the tunnel. I'm usually about the same as other vehicles.

If anything wish they were more sensitive and came on earlier...
What would be awesome is if tunnels could send out an "EZ Pass" type of signal that would trigger automatic headlights to come on right as you enter and off when you exit it, overriding the daylight sensor.

It could even tie into the SWS (Safety Warning System) the DOT was developing at one point that sent warnings to RADAR detectors when the driver was approaching construction zones and stopped emergency vehicles.
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