headlight low beam problems
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, headlight low beam problems in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; hey everyone, my driver's side low beam is out. took the front end apart and replaced the hid xenon bulb....didn't ...
  1. #1
    kevcts is offline Cadillac Owners Member
    Automobile(s): 2003 cts
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    headlight low beam problems

    hey everyone,
    my driver's side low beam is out. took the front end apart and replaced the hid xenon bulb....didn't fix it. swapped the passenger side to test the new bulb(it worked) and neither bulb worked on the driver's side. checked the 20 fuses for both left and right, both good, even swapped them, both good. still no working headlight.....what next.....besides the dealer that I just got back from valve cover gaskets and they said nothing about the headlight even though I know they checked it. I keep the headlight switch on auto, and when I got the car back it was off.
    thanks kev

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  3. #2
    jran0823's Avatar
    jran0823 is offline Cadillac Owners Enthusiast
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    Time for a new ballast.

  4. #3
    Kingoftypos is online now Cadillac Owners Master
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    They might of turned the headlights off just for going into the shop. Sometimes when putting a car on a lift, they would leave it in neutral. Thus need to turn the lights off.

    But I agree with jran, the hid ballast. First I would swap the driver and passenger around. Then order a new ballast if it follows the ballast.

    KOT.

  5. #4
    kevcts is offline Cadillac Owners Member
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    Re: headlight low beam problems

    ok thank you. however I have no idea what or where the ballast is.....

  6. #5
    Kingoftypos is online now Cadillac Owners Master
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    You touched it when you swapped the bulbs. Well I'm pretty sure you did. The ballast is located on the underside of the headlight housing.

    KOT

  7. #6
    kevcts is offline Cadillac Owners Member
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    Re: headlight low beam problems

    ok thanks. I do have moisture inside that same dysfunctional light. what are the chances that if I replace the ballast, it will go bad from moisture? am I better off replacing the whole assembly?

  8. #7
    kevcts is offline Cadillac Owners Member
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    Re: headlight low beam problems

    So I took the front apart again to check the ballast.....swapped it with the other side and problem solved....almost. the bad ballast was drenched with water...pouring off. So the moisture problem is the cause. Since I had it apart, and I dont have the new ballast yet, I put some silicone around some of the edges and will wait to see if it helps before I replace the ballast. Might need a whole new housing.

  9. #8
    Kingoftypos is online now Cadillac Owners Master
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    Re: headlight low beam problems

    If it was that drenched, yeah a new housing maybe in store for you. Try finding where the moisture might of found its way in first. Seal that up and see what happens. Just make sure you don't seal up any vent holes, including from the ballast to the housing. If there are any, it's been a couple years since I took them apart.

    I know there are some in the back of the housing, they should have little one to two inch tubes attached to it with a angle downwards.

    KOT

  10. #9
    kevcts is offline Cadillac Owners Member
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    Re: headlight low beam problems

    I read in some other posts about the vents. Saw them and blew in to make sure they were clear. It will be a few days before I decide which way to go, so I should see where I'm at by then. Thanks

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