techsavvy Posted September 12, 2011 Report Share Posted September 12, 2011 So this 1985 Seville has a switch which i removed and switched with a new one. I believed that by replacing the switch the night time lights would turn on by themselves. But no, the lights do not turn on/ I manually have to turn them on. Any Ideas? Link to comment Share on other sites More sharing options...
Texas Jim Posted September 12, 2011 Report Share Posted September 12, 2011 It is possible that the light sensor in the center of the dash is bad... Link to comment Share on other sites More sharing options...
rockfangd Posted September 13, 2011 Report Share Posted September 13, 2011 or disconnected for that matter GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
Cadillac Jim Posted September 13, 2011 Report Share Posted September 13, 2011 The simplest way to test the twilight sensor is to plop a clipboard or other totally opaque object on it and see if the headlights come on, and the dash lights dim, in a minute or less. If the delay slider (above the light switch) is about a quarter inch (6 mm) to the right of the detent, the delay is 15 to 30 seconds; that's the most preferred setting. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
techsavvy Posted September 14, 2011 Author Report Share Posted September 14, 2011 The simplest way to test the twilight sensor is to plop a clipboard or other totally opaque object on it and see if the headlights come on, and the dash lights dim, in a minute or less. If the delay slider (above the light switch) is about a quarter inch (6 mm) to the right of the detent, the delay is 15 to 30 seconds; that's the most preferred setting. thanks for the help you all. I was looking for the twilight sensor but could not find it. The dash board seems to have been reupolstered therefor the switch is no where to be found. Does anyone have a wiring diagram for the light switch. ? Link to comment Share on other sites More sharing options...
Texas Jim Posted September 17, 2011 Report Share Posted September 17, 2011 The twilight sensor "SHOULD BE" in the front portion of the dash... 3 or 4 inches back from the windshield, in the exact center... when measuring from side to side. If the dashboard has been recovered, and they covered the twilight sensor, they had to disconnect it or jumper it, to keep the headlights from being on all the time. Link to comment Share on other sites More sharing options...
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