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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    T63 Factory-verified

    Chevrolet · Regular Production Option

    Buzzer, headlamp warning

    Years 1970–79, 1983–89 Models 5 Factory citations 11
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    Also described as Headlamp warning buzzerHeadlamp Warning (buzzer)Buzzer headlamp

    Also documented for BuickGMCPontiac

    Documented applications

    Blazer (full-size, K5) — Square body (1983–1991)
    • 1983–1986 Factory-verified

      the 1990 trim page lists the headlamp warning buzzer as standard

      GM Heritage factory kit — 1983 Chevrolet Blazer, p.10.
      GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.6.
      GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.11.
      GM Heritage factory kit — 1986 Chevrolet Blazer, p.12.
    Suburban — Square body (1983–1991)
    • 1983–1989 Factory-verified

      included with YE9 (1988–1989)

      GM Heritage factory kit — 1983 Chevrolet Suburban, p.16.
      GM Heritage factory kit — 1984 Chevrolet Suburban, p.22.
      GM Heritage factory kit — 1985 Chevrolet Suburban, p.19.
      GM Heritage factory kit — 1986 Chevrolet Suburban, p.20.
      GM Heritage factory kit — 1987 Chevrolet Suburban, p.25.
      GM Heritage factory kit — 1988 Chevrolet Suburban, p.18.
      GM Heritage factory kit — 1989 Chevrolet Suburban, p.15.

    Related codes · mentioned in these notes

    YE9

    This page aggregates every documented appearance of T63 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.