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It's the dimmer switch. Which is called the multifunction switch or turn signal switch. Just because it clicks, doesn't mean the it is working properly. If you click and the high beams come on, then click it again and have no low beams, replace the switch. Daytime running lights are controlled by the Body control module.
you vehicle is equipped with daytime running lights, insurance companies actually prefer this as it is easier to see your vehicle by other drivers, it does no harm to the vehicle.
Have alternator checked car may be running on battery power only. Check alternator belts as well. At night, look at lit dashboard while car is in idle, if dashboard lights are pulsating a bit the alternator may need to be replaced.
There's headlight relays for both low and high beam (if I recall correctly) and a main relay (on the junction box near the battery). I'd guess initially that a relay is faulty.
If its the daytime running lights (DRLs) that are flashing the high beam on and off, they are controlled by a combined oscillator and relay box (looks like a large relay can). This box provides about 9v to the HB lights to provide the DRL function. You can disconnect the DRL box and see if the problem goes away.
HB and LB are separate from the DRL circuits. If the HB or LB are flashing (ie at night), I'd suspect the main relay.
It sounds like they are automatic lights and that the light sensor is going bad. Look around on the dashboard for a small plastic dome, that is where the sensor is. There should be a plate or something holding it in place.
I have a 1997 cadillac deville that has both 'daytime running lamps' when put into gear and 'twilight sentinel' which turns the headlamps and parking lamps on at night, and goes off during the day or when it is bright enough.
There is an adjustable delay for the twilight sentinel to turn the headlights off after the ignition key is removed and it is night time.
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I had the 'daytime running lamps' installed on a 1990 Cadillac Deville that turns the headlamps only on when the ignition key is switched to on with an aftermarket module. The headlamps are about 70% or so as bright as the regular twiilight sentinel headlamps and parking lights and are designed to go on during the day.
The twilight sentinel overrides this feature when it gets dark outside.
I had the daytime running lamps installed by an auto electric shop that specializes in electrical systems, alarms, stereos, etc.
no they can't you can try depressing the parking brake just one click so the brake light comes on this usally will over ride the daytime running lights and will not ingage the brake seeing it is only one click. good luck
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