Question about 1996 Chevrolet Impala SS

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Twilight Sentinal Malfunction

Lights quit coming on automatically. I replaced optical sensor under the defroster vent but no help. There is surely a control module this sensor feeds a signal to, but where is it? Lights work fine when operated from dash panel switch.

Thank you,
Dave

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  • wdekon4025 Apr 17, 2009

    my twlight sentinal stopped working when i use it the dash lights dont come on and also the back lights dont come on. Use the dash switch everything works fine how can i fix

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There is a relay under the dash, on a fuse block with a black plastic cover. Usually the cover is labeled "Fuse and relay center" or "Power and relay center". Inside you'll find several large blade style fuses and quite a few relays. There are normally two or three relays associated with your lighting. In many mid nineties and up GM products, you have a relay for rear lighting, one for front lighting, and a separate relay labeled "DRM" or "DRL". You're looking for that one. This is the daytime running light relay. Odds are that relay has burnt out and needs replaced.

Posted on Feb 11, 2009

  • Randall LaClaire Feb 11, 2009

    Whups, sorry was thinking for some reason that you posted about the daytime lights. Just reread. You're still looking for a relay in that same group of relays, though, just not the DRL one! Off the top of my head I can't remember the label for the night time automatic lighting, but I do recall it is there. The inside of the cover is labeled with a diagram of the fuses and relays, and your owners manual should have a translation of what those abbreviations mean. If you have no manual, either do a google search for the abbreviations "eg: chevrolet relay XXX meaning" or post the ones you are unsure of here and we'll see what we can do!

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