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My low beam headlights aren't working, but the high beams…

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My low beam headlights aren't...
My low beam headlights aren't working, but the high beams work. What is the most likely cause?
Submitted: 5 years ago.Category: Pontiac
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Answered in 6 minutes by:
10/6/2012
Pontiac Mechanic: GM Tech (Cam), Pontiac Technician replied 5 years ago
GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 30,239
Experience: GM Grand Master Technician 2007. 14 years experience.
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GM Tech (Cam) :

Hello, I'm Cam.


GM Tech (Cam) :

To be honest, the most common cause are the bulbs. They are bright enough that you may not notice one is out, but when both go out, you think both went out at the same time.


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Pontiac Mechanic: GM Tech (Cam), Pontiac Technician replied 5 years ago

To be honest, the most common cause are the bulbs. They are bright enough that you may not notice one is out, but when both go out, you think both went out at the same time.

So what I would like you to do first is replace one bulb. There are tabs you lift around the headlight that will allow the light to be removed, then you can change one bulb.

graphic

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Customer reply replied 5 years ago
Before I buy bulbs when I turned my car on It heard two click like a relay was trying to work is there a relay for the headlight bulbs?
Pontiac Mechanic: GM Tech (Cam), Pontiac Technician replied 5 years ago
NO, not directly. The way this system works, the bulbs get power all the time, then when the headlights are on, a conact closes and the ground is provided to control the bulbs. When you trigger high to low, it simple changes which bulbs get grounded, highs or lows.
So if the high beams work, that means the bulbs are getting power, but the low side does not work. Even if you check the bulbs. YOu can usually see if the element is out. It you want to test, ground the dark blue wire by splicing into it with a wire and trouching ground. If the lights do not come on then the bulb is bad, If they do then possibly the dimmer switch.
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Customer reply replied 5 years ago
Why is the dimmer switch located?
Pontiac Mechanic: GM Tech (Cam), Pontiac Technician replied 5 years ago
The dimmer switch is the stick you pull back to change from low to high.
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Customer reply replied 5 years ago
Is there a separate switch for the dimmer or is it built into the headlight relay?
Pontiac Mechanic: GM Tech (Cam), Pontiac Technician replied 5 years ago
No,. the switch simply changes the contacts for the headlight.
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