Question: I have a 2002 Oldsmobile Aurora that the headlights does not come on properly. When at nightime, it seems that I only have to put the high beam (bright lights) on for the interior lights and the taillights to come on at the same time. When I put the headlights on low beam at night time,
the interior lights and the taillights does not come on. But in the daytime it seems as though the headlights high and low beam both come on with the interior lights and the taillights all to come on at the same time.
In the daytime whether I use the low or high beam lights , the interior lights and the tai lights come on either way at the same time. But as I say, when I put the headlights on low beam at night time, the interior lights and the taillights does not come on at the same time with the low beam headlight. But in the daytime when I put the headlights on low beam or high beam, the interior and tailights (can)come on at the same time. Why is this? What do I do for all the lights to work properly at night time?
Answer: Sounds like you have a headlight switch problem. The interior lights have nothing to do with any exterior light, so the interior lights should function properly. Be sure to check all fuses. Play around with the light switches, turning them on and off very quickly and harshly. Do the same for the turn signals, as all these switches are part of the multifunction switch in the steering columns. This is all assuming you do not have a non-factory alarm. If you do, get rid of it !
1990 BMW 535i Engine Size : 260.
Question : i have no low beam but i have high beam. I checked and the bulbs are all ok.
Answer: The first thing you need to do for this headlight problem is to check all the fuses. I believe there is also a headlight low beam relay. That would be in the fuse box. Swap that relay with another one of the same size. If the fuses and relay are good you could try and work the headlight switch very rapidly on and off. Sometimes this will free up a switch that has corroded or dirty electrical contacts.
If none of this helps then you would need to get hold of a schematic and do some circuit testing. You have to test for power into each bulb socket on the low beam circuit. If you have power in, next you would need to check the ground side. Since both bulbs are out, it must be something in common. There would be a splice in the wiring harness that powers or grounds both side bulbs. They tend to get green corrosion from water intrusion, especially if it is located under the car or near the radiator cross member.