What is F15 code? ('90 DeVille 4.5)
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HT4100 4.1, 4.5, 4.9 Discussion, What is F15 code? ('90 DeVille 4.5) in Cadillac Engine Technical Discussion; What controller has an "F" prefix? What is F15? My manual doesn't list it. (Periodically I check the display codes ...
  1. #1
    mdogg1950 is offline Cadillac Owners Member
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    What is F15 code? ('90 DeVille 4.5)

    What controller has an "F" prefix? What is F15? My manual doesn't list it.
    (Periodically I check the display codes on my '90 DeVille.)
    Thanks in advance!
    Matt

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    steelybill is offline Cadillac Owners Enthusiast
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    Re: What is F15 code? ('90 DeVille 4.5)

    The sticky above says something about a solar sensor (?) Is that possibly for lights ?

  4. #3
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: What is F15 code? ('90 DeVille 4.5)

    BCM codes are prefixed by an "F". First pass are PCM codes displayed as "E". Then "EE" indicates the second pass of the PCM codes, and these are current trouble codes. Anyway, a F15 code is SUN LOAD SENSOR CIRCUIT. This by the way does not turn on any light. Code F15 will set if circuit 590 is open or shorted to ground. That circuit goes from position C7 of the BCM to the 40-way I/P to dash to the sun load sensor. You need to get to BCM data parameter P.3.2 and check the value of 0 to 255. So you can have a wire problem, sun load sensor failure, or a BCM failure. I don't know where the 90 Deville sun load sensor is located. I do know that it is in the RH speaker grille top of dash on the 92 and 93 model year. Does your twilight sentinal work?

  5. #4
    mdogg1950 is offline Cadillac Owners Member
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    Re: What is F15 code? ('90 DeVille 4.5)

    Thanks for the info! Believe it or not, I've never used twilight sentinel on this vehicle!
    I'm just glad this code doesn't point to an engine failure!
    Thanks again,
    Matt

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: What is F15 code? ('90 DeVille 4.5)

    The sun load sensor is not for twilight sentinel. It's for the A/C.

  7. #6
    89caddev's Avatar
    89caddev is offline Cadillac Owners Member
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    Re: What is F15 code? ('90 DeVille 4.5)

    Quote Originally Posted by Ranger View Post
    The sun load sensor is not for twilight sentinel. It's for the A/C.
    I have a 89 Cadillac deville and get the F15 code. Can some one please tell me where & how to install sunload sensor. Where can I purchase one?

  8. #7
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: What is F15 code? ('90 DeVille 4.5)

    Quote Originally Posted by 89caddev View Post
    I have a 89 Cadillac deville and get the F15 code. Can some one please tell me where & how to install sunload sensor. Where can I purchase one?
    It is usually in the corner of one of the dash speaker grille. Not sure if a dealer can get these anymore. Your best bet might be a salvage yard.

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