Power door locks

Years 1984–87, 1998, 2012, 2016–19, 2025–26 Models 6 Factory citations 12

Also described as Door locks, power, programmable, with lockout protectionDoor locks, powerLocks, power doorDoor locks, power, with lock-out protection

Also documented for Cadillac Chevrolet GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

Century — A-body (1982–1996)

1984–1986 Single-source

Years from the parts catalog 44A (Nemiga mirror, T3): door hardware group 10 pages 4A10-301 and 4A10-302 date the lock-rod clip for AU3 "1984-86" and 4A10-301 the lock relay for AU3 to 1986

Envision — D2XX, imported from China (2016–2020)

2016–2019 Factory-verified

all trims: S

GM factory document — 2016 buick envision order guide copy gm authority, p.1, p.11.
GM factory document — 2017 buick envision order guide copy gm authority, p.2, p.13.
GM factory document — 2018 buick envision order guide copy gm authority, p.2, p.13.
GM factory document — 2019 buick envision order guide copy gm authority, p.2, p.14.

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.2.
GM factory document — 2026 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2026 buick envista fleet order guide, p.2.

Regal — G-body (1983–1987)

1987 Factory-verified

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.

Verano — Delta II (2012–2017)

2012, 2016 Factory-verified

2016: all trims: S; 2012: GM 2012 ordering guide, all trims: S

GM factory document — 2016 buick verano fleet order guide wayback, p.2.
GM factory document — 2012 buick verano online ordering guide copy gm authority, p.2.

This page aggregates every documented appearance of AU3 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.