this could be due to a bad ground Wire running in the ignition
Yes, the ignition on a trailblazer can cause head lights to work improperly.
One thing that could cause this would be a faulty ignition switch, specially if you do not have ignition (cluster) lights. Just a thought...
most likely is a faulty chime switch,or a faulty ignition switch
Passlock sensor (Ignition housing) Or body control module fault
sometimes the head lights and tail lights may be fused separately,check your fuses.you could have a bad ground.thats just two places to start.
Headlight power is not controlled by the ignition switch or keys. Damage to the turn signal lever could cause the 'flash to pass' circuit to stay on. Damage to the light switch could also cause the lights to stay on.
It could be a combination of two simple problems. First, check that your parking light switch on the top of your steering column is OFF, as this will keep the lights on even if the ignition switch is off. I believe this switch is necessary because your lights turn off automatically when you turn of the engine (ignition switch) Aslo, you must check your (combination tail light and brake light) rear bulbs as this could cause the break and tail lights to remain on when the car is started (ignition is on). GOOD LUCK !
Could be either a bad ignition switch or a bad voltage regulator (not opening circuit on shut-down)
Broken switch, replace it.
If your side lights stay on when your ignition is off on a Granada Scorpio Costworth, it could indicate a wiring malfunction. You should also check the fuses.
Ignition is required for an engine to work. Failure of ignition would prevent the engine working.
a short can indeed cause this. Any grounding of the positive flow can cause numerous problems. Fix it befor you have a meltdown or fire.