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Thread: Adjusting headlights

  1. #1
    reneeg is offline Cadillac Owners Member
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    Adjusting headlights

    Anyone know about adjusting headlights? I know where and how but not sure if it adjusts the high beam, low, or both? Any feedback is greatly appreciated. Thanx in advance!


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    1BadCadSTS is offline Cadillac Owners Connoisseur
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    ewill3rd is offline Cadillac Technician
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    Re: Adjusting headlights

    I recommend taking it to a shop that has a proper aiming machine and let them do it.
    Manual aiming requires a large flat space, marking off lines and making sure it is right. When you turn the adjusters you are typically aiming the low beam. If you have HID it is the same "bulb" anyway.
    You can really only do vertical aim on these but it is fairly important to make sure it is done properly and most shops only charge 25 or 35 dollars for aiming.

  5. #4
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Adjusting headlights

    Quote Originally Posted by ewill3rd View Post
    If you have HID it is the same "bulb" anyway.
    I know when you adjust it, both are adjusted, but in the case of this car, the HIDs don't use shutters. The high beams are a separate halogen bulb that projects through the bottom projector.

  6. #5
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    erichthecatt is offline Cadillac Owners Fanatic
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    Re: Adjusting headlights

    When I had the 2014 xts over night last week, the headlights would come on, tilt down, and then back to postion. Are the new Cadillac headlights self adjusting?

  7. #6
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Adjusting headlights

    The HIDs will point down to prevent from blinding oncoming drivers when the rear of the car "squats" under acceleration, and under braking, the beams will point upward to provide illumination to compensate for the nose pointing down. When the beams point up and down like that when the automatic lights go on, you know it has this feature. This has long been a requirement for cars equipped with HIDs in other countries. As a matter of fact, the export STSs have the feature. The 2nd gen cts which had the swiveling beams with the steering wheel didn't have the feature either, again, with the exception of export models due to the requirement there. Good to see GM is finally doing this across the board.
    Last edited by Guy.Seminerio; 01-13-14 at 01:33 PM.

  8. #7
    ewill3rd is offline Cadillac Technician
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    Re: Adjusting headlights

    The systems that offer electronic vertical control still need to be aimed for a zero position. The lamps don't know what zero is without a manual calibration.

  9. #8
    ddalder's Avatar
    ddalder is online now Cadillac Owners Connoisseur
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    Quote Originally Posted by Guy.Seminerio View Post
    As a matter of fact, the export STSs have the feature.
    And in the spring, there will be one North American STS with this feature too.

  10. #9
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by ddalder View Post
    And in the spring, there will be one North American STS with this feature too.
    It's about time!! I've been hoping you'd get this done soon

    But yes the high and low adjust together because inside the housing they are one large single assembly for high and low. The STS doesn't have horizontal L/R adjustments only up and down.
    If you really must adjust them on your own the general DOT spec calls for a 2.5" drop at 25 feet. So measure from the ground to the center of the lowbeam projector or if the housing has the small aiming circle in the lens cover then go out 25 feet and remeasure and you should be 2.5" lower measuring the lower step of the HIDs output. ___/---- the ECE spec calls for less of a drop I believe it's 2" drop.


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