My headlights go off and on in both high and low beam. Sometimes they stay on longer than others. I did replace the headlight switch and it still does it. All other lights work well.
Had same thing and noticed headlight switch gets very, very, hot. Lights flash after lights have been on about 45 minutes, and noticed burning smell. Clamped a 12-volt fan to emergency brake pedal so it's aimed behind dash and facing up toward switch, and wired it in. Problem solved. Others have mentioned the switches on similar-year vehicles also get hot which leads me to believe it's a design issue. Switch can't handle the current going through it and eventually the heat causes it to fail.
SOURCE: My headlights are not working, but shows my high beams are on
Low Beam Fuse may be bad.
Low Beam relay position is bad.
Stalk that controls the high/low beams/cruise/lights is bad.
Low beam filament may be bad in both headlamps.
SOURCE: 2002 Impala, headlights work however they blink
This may be the start of a worse problem that the Impala eventually developes. The Body Control Module has a design flaw along with the Passlock anti-theft system. You may get away with just replacing the BCM for now. It needs to be reprogrammed at the dealer and the car will not start if you replace the BCM without reprogramming it. I would also recommend against replacing it with a remanufactured one. Repair cost is going to be around $500 at the dealer.
If the Passlock system is also at fault, add another $500 for a new ignition switch and cylinder. If you haven't experienced random starting problems yet, they are coming soon. When you turn the key, nothing happens. I thought my 2002 Impala may have been immune to these problems that I've heard about constantly, however, at 90,000 miles, it became "possessed". The symptoms started slowly and got worse. Beside the interior lights flashing like strobs in the middle of the night (while the car was not running), the headlights would occasionally click off and on a few times while I was driving at night.
The relay switch you hear clicking is the Battery Rundown Protection relay. I'm suprised your battery hasn't drained to the point where the car will not start in the morning.
SOURCE: 1998 cavalier headlights will not work. low or
check wiring in the front bumper for corrosion big problem relating to cavalier and sunfire
SOURCE: No headlights. Low beam out High beam work. I
could be becauce if you dont have low beams and high beams do work once you replace them with new bulbs low beams should work.
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