Automatic headlight issue - JeepForum.com

 
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post #1 of 11 Old 06-27-2013, 09:40 AM Thread Starter
esu
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Automatic headlight issue

Guys, have a 95 ZJ and slowly but surely getting all the nice little doodads to work. Got my VIC and my overhead console up and running and just noticed that I have auto headlights. So I turn the headlight switch to auto, at night of course, and they turn on no problem. They also go off when the jeep is turned off. So far so good. Next day, its still in the auto position and I notice the headlights are on even though its daytime. Is the sensor for this the little round black thing in the middle of my dash? Looks like a real pita to change, probably not worth it. Any thoughts or suggestions or other possibilities?

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post #2 of 11 Old 06-27-2013, 10:58 AM
xcaliber81
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No the sensor is off to the left a bit under a tiny hole in the vent if you pull up the vent you will see a blue sensor with about 4" of wire.
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post #3 of 11 Old 06-27-2013, 07:32 PM
vonericsen
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xcaliber is correct on it's position. Pull it out and clean it and it will probably work. Just lift the black vent bezel off, then twist the blue sensor out from the bezel and wipe it down with something (or blow it off with something like canned air). Mine had a lot of dust on it making it not work correctly.

Moss Green 95 5.2l ZJ- 5.5" IRO lift, 255 75 R17 BFG M/T on JK Moabs, Mopar ECU, Mopar Tire Carrier
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post #4 of 11 Old 06-27-2013, 07:44 PM Thread Starter
esu
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Excellent, thx for the info. Will give that a whirl tomorrow and see what happens. Thx Cory.
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post #5 of 11 Old 06-27-2013, 09:40 PM
davidtownsend
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Is there anyway to make the sensor more sensitive?

1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #6 of 11 Old 06-27-2013, 10:47 PM
vonericsen
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The only thing I can think of is replacing the photo-resistor with one that will have a different resistance in the same amount of light than the one from the factory.

Moss Green 95 5.2l ZJ- 5.5" IRO lift, 255 75 R17 BFG M/T on JK Moabs, Mopar ECU, Mopar Tire Carrier
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post #7 of 11 Old 06-28-2013, 06:58 AM
davidtownsend
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Quote:
Originally Posted by vonericsen View Post
The only thing I can think of is replacing the photo-resistor with one that will have a different resistance in the same amount of light than the one from the factory.
Would you have a link to one?

1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #8 of 11 Old 06-28-2013, 07:16 AM
AnotherRedZj
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Quote:
Originally Posted by xcaliber81 View Post
No the sensor is off to the left a bit under a tiny hole in the vent if you pull up the vent you will see a blue sensor with about 4" of wire.
I'll have to look into this.mine Jus turns on the parking lights and fogs in auto, and they Jus stay on. Could have something to do with the dimmer switch too I guess.

One of these days!

96 ZJ sittin up 6" on 35's with 4:56's and a 12k winch. Cuz...why the hell not!?
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post #9 of 11 Old 06-28-2013, 07:31 AM
vonericsen
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Quote:
Originally Posted by davidtownsend View Post

Would you have a link to one?
http://www.digikey.com/scripts/DkSea...sistor&x=0&y=0

Moss Green 95 5.2l ZJ- 5.5" IRO lift, 255 75 R17 BFG M/T on JK Moabs, Mopar ECU, Mopar Tire Carrier
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post #10 of 11 Old 06-28-2013, 07:35 AM
davidtownsend
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Quote:
Originally Posted by vonericsen View Post
Thank you!

1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #11 of 11 Old 06-29-2013, 03:19 PM Thread Starter
esu
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Ok, pulled that badboy out today and it was just where you guys said and covered with crap. The po didn't clean anything. Anyway, cleaned it off, re-installed and although they do come on at first after a few seconds the lights go off. Now to move on to the next issue, thx again, and happy 4th of July to all.
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