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Thread: Fog Lights will not turn on.

  1. #1
    ThaUnknownOne is offline Cadillac Owners Member
    Automobile(s): 2000 Cadillac STS
    Join Date
    Feb 2012
    Age
    36
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    Fog Lights will not turn on.

    I really cannot figure this one out. I cannot get the fog lights to turn on at all. All the fuses under the hood are fine, none are blown and the fuse box is powered appropriately. Here is where I am. I pulled out the headlight control module (to the left of the steering wheel). It has a button you press for the fog lights to turn on, when I try to test the switch and see if current level changes, there is nothing different. So I know this is a dumb question, but is it possible that module box needs to be changed and the fog lights may work? Ever though everything else on the module box works?


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  3. #2
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx miles)
    Join Date
    Sep 2003
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    Metro ATL
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    4,854

    Re: Fog Lights will not turn on.

    Is the key ON?

    Does the FOG symbol on the DIC illuminate?

    There is a FOG LP relay in the underhood box; borrow a four blade relay from another circuit as a test.

    Both fog lamp bulbs could be burned out ??

  4. #3
    ThaUnknownOne is offline Cadillac Owners Member
    Automobile(s): 2000 Cadillac STS
    Join Date
    Feb 2012
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    36
    Posts
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    Re: Fog Lights will not turn on.

    No fog symbol illuminates anywhere. Bought new fog lights and still no action. Changed that fuse and no action either

  5. #4
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx miles)
    Join Date
    Sep 2003
    Location
    Metro ATL
    Posts
    4,854

    Re: Fog Lights will not turn on.

    And the relay?

  6. #5
    ThaUnknownOne is offline Cadillac Owners Member
    Automobile(s): 2000 Cadillac STS
    Join Date
    Feb 2012
    Age
    36
    Posts
    23

    Re: Fog Lights will not turn on.

    Changed relay as well. Nothing..

  7. #6
    elmysterio is offline Cadillac Owners Member
    Automobile(s): 2003 cadillac dts
    Join Date
    Apr 2012
    Posts
    45

    Re: Fog Lights will not turn on.

    make sure your high beams are not on


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