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Unread 10-13-2013, 11:39 AM   #1
jt_armstrong
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1994 ZJ 
 
Join Date: Jan 2011
Location: Lake Forest, California
Posts: 139
Ambient Light Sensor

The headlights on my '94 don't react to the fact its daylight and stay on the whole time when I driving. My guess is that there is an ambient light sensor that has failed. Has anyone had a similar issue? Also on the dash there are two sensors which one is the culprit?
Thanks

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Unread 10-13-2013, 12:17 PM   #2
xcaliber81
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1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George, B.C
Posts: 2,819
The blue one, the dome one is for atc just clean it off chances are its dirty.
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Im indian my elders name is Jeep Grand Cherokee, I mean Chief Grand Cherokee. Quoted from Peter Griffin.
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Unread 10-13-2013, 01:09 PM   #3
jt_armstrong
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1994 ZJ 
 
Join Date: Jan 2011
Location: Lake Forest, California
Posts: 139
Thanks dude, tried that without success. Does anyone if it possible to test the senor (shorting the wires) I doubt it is variable but does it expect a certain resistance?
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Unread 10-13-2013, 01:46 PM   #4
dnuccio
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1995 ZJ 
 
Join Date: Jul 2012
Location: Phoenix, AZ
Posts: 3,484
you could just not use the auto light control and turn the knob 2 clicks at night when you need the lights
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Unread 10-13-2013, 01:50 PM   #5
MoparMech
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1995 XJ Cherokee 
 
Join Date: Jul 2013
Location: GRAND FORKS, North Dakota
Posts: 73
start the vehicle, turn the headlights to auto, take a flash light and shine it right on the ambient light sensor if the headlamps turn off great, next step, cover up the ambient light sensor and make it as dark as possible, if the headlamps turn on its good.
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Unread 10-13-2013, 03:16 PM   #6
jt_armstrong
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1994 ZJ 
 
Join Date: Jan 2011
Location: Lake Forest, California
Posts: 139
Success..:-)
I removed the sensor from the vent grill housing and this time I noticed that the actual sensor is not enclosed and therefore open to contamination. The part I cleaned appears to be a light filter of sorts which sits above the actual sensor. A quick blast of air did the trick.
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Unread 10-13-2013, 03:50 PM   #7
xcaliber81
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1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George, B.C
Posts: 2,819
I like my auto lights. I like how you get that 30 or delay when shutting the jeep off at night.
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Im indian my elders name is Jeep Grand Cherokee, I mean Chief Grand Cherokee. Quoted from Peter Griffin.
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