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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    UM4 (A1/A3) Disputed

    Cadillac · Regular Production Option

    AM/FM stereo w/ 8-track or cassette, digital display

    Years 1979 Models 1

    Documented applications

    Seville
    • 1979 Disputed

      Mileposts pairs UM4 w/ A1 8-track; CLC pairs A3 cassette — radio code pairings conflict

    This page aggregates every documented appearance of UM4 (A1/A3) in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.