Windshield wipers, 2 speed, low speed delay

Years 1987, 1998, 2025–26 Models 3 Factory citations 6

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Also described as Wipers, front intermittentWindshield wipers, variable delay

Also documented for Chevrolet GMC Oldsmobile Pontiac

Documented applications

Envista — VSS-F (2024–2027)

2025–2026 Factory-verified

all trims: S

GM factory document — 2025 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2025 buick envista fleet order guide, p.6.
GM factory document — 2026 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2026 buick envista fleet order guide, p.6.

Regal — G-body (1983–1987)

1987 Factory-verified

requires N33 when ordered with D55; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit

GM Heritage factory kit — 1987 Chevrolet Monte Carlo, p.40.

Skylark — N-body (1992–1998)

1998 Factory-verified

GM factory document — 1998 buick skylark rpo code list, p.1.

This page aggregates every documented appearance of CD4 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.