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Unread 07-14-2011, 03:37 PM   #1
jeepmanalex
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Headlights turning off and on by themselves

Hey guys I have a 99 WJ 4x4 4.7L and recently I had been having trouble with my jeep dying overnight for no apparent reason, then the other day I discovered, after replacing the old dead battery, that my jeep is turning the headlights on and off over and over. I have seen this at night and I am sure that it is doing it during the day too just havent actually seen it during the day. I am pretty sure this simply ruined my old battery by draining it too many times. I have seen other threads on this but nobody seems to know whats up here and I was hoping that maybe one of you has figured it out. I have never tampered with the headlights on the car by replacing bulbs or anything like that and I keep them set on auto all the time. I saw someone mention something about a possible worn out ignition but im not sure. Any suggestions or help u guys can give is greatly appreciated, thanks.

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Unread 07-14-2011, 04:42 PM   #2
narnwv
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Try turning off auto. It could be the light sensor.

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Unread 07-14-2011, 05:20 PM   #3
hxcjohnny
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+1

my guess would be that its in the switch, or the sensor that automatically turns them on when it gets dark. I would try not using the automatic setting and just turn the lights completely off when you get out.
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Unread 07-14-2011, 06:15 PM   #4
roach68
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Mine will do the same thing if I leave it on auto. If I turn them off they stay off.
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Unread 07-14-2011, 08:35 PM   #5
jeepmanalex
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Alright i just went outside and turned it off auto, hopefully that will fix the problem for now but its so frustrating when stuff doesnt work the way its supposed to, thanks for your help guys I'll let you know if I figure it out farther than what you all have said.
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Unread 07-14-2011, 09:06 PM   #6
WJguyinKC
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Could very well be the ignition cylinder. I had the same problem and had to get a new battery as well. Then the ignition cylinder locked up and I broke a key off in it. After I replaced the cylinder and got new keys cut and coded, I haven't had the issue since. I hadn't thought of it since, but the posts reminded me of the sequence of events.
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Unread 07-15-2011, 02:38 PM   #7
jeepmanalex
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well i really hope that doesn't happen but I will definitely keep that in mind, really dont want to have to get a new key cut and coded 90 bucks for a key is ridiculous
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Unread 07-15-2011, 02:41 PM   #8
bmandubj10
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I hate the auto switch on the Jeep, I never use it, just stay away from the auto and see if that works.
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Unread 07-15-2011, 03:30 PM   #9
WJguyinKC
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Quote:
Originally Posted by jeepmanalex
well i really hope that doesn't happen but I will definitely keep that in mind, really dont want to have to get a new key cut and coded 90 bucks for a key is ridiculous
Amen to that. The cylinder was super easy to replace, and 90 bucks got me 2 keys...of course it was another 90 to have them coded....
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Unread 07-15-2011, 08:35 PM   #10
billzcat1
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Yeah... my auto switch is built into my left hand. Key to on, headlights to on.
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Unread 07-16-2011, 07:13 AM   #11
hxcjohnny
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do you guys know what part is going bad with the auto headlights? Is it the switch on the stalk, or is it the sensor?
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Unread 07-16-2011, 08:56 AM   #12
TomClancy
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Yeah, auto switch kept turning on my headlights in the middle of the day when I went under a bridge where there are shadows.
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Unread 07-18-2011, 03:11 PM   #13
jeepmanalex
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Well it makes sense that the auto switch would turn your lights on in shadows under bridges because of the lower light level, i dont think that alone means that its broken so I am not sure whether or not the problem is in the sensor (which is located right on the top of the dash, its the front of the little red light that flashes when you lock the car) or in the switch itself, but mine was flipping on and off while i was in broad daylight, I could hear the clicking of the lights inside turning on an off with the headlights. As much as I love little convienient things like auto headlights it just proves that when this stuff breaks its a pain to fix, i dont see how people drive around in a lexus or mercedes etc. where the car has a mind of its own.
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Unread 07-19-2011, 11:41 AM   #14
kiddull
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The prob is with the multiplexer for all the buttons on the steering column. The voltage difference between on and auto is milivolts apart. When the battery is weak that multiplexer will turn your lights on and off. Had it happen a bunch on mine first time the battery was weak. Then about a year into my new battery it started happening again and found that that battery had a bad cell.
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Unread 07-19-2011, 04:34 PM   #15
radryan505
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I have the same problem. Everyone says its the sensor, I hear my click on and off during the day. But mine will be ok for like... a month, then all the sudden start doing it again. Go with the off switch... quick and cheap fix.
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