Control, seat, power lumbar, driver

Years 2000–09, 2016–19, 2022–23, 2025–27 Models 9 Factory citations 25

Also described as Seat adjuster, power lumbar control, driverSeat adjuster, power driver lumbar controlSeat adjuster, 2-way power driver lumbar controlSeat adjuster, driver lumbar, 2 way powerSeat adjuster, driver 2-way power lumbar control

Also documented for Cadillac Chevrolet GMC Pontiac

Documented applications

Cascada — Delta II (2016–2019)

2016–2019 Factory-verified

all trims: S

GM factory document — 2016 buick cascada order guide copy gm authority, p.2, p.6.
GM factory document — 2017 buick cascada order guide copy gm authority, p.2, p.12.
GM factory document — 2018 buick cascada order guide copy gm authority, p.2, p.11.
GM factory document — 2019 buick cascada order guide copy gm authority, p.2, p.11.

Enclave — C1XX (2018–2024)

2018, 2022–2023 Factory-verified

2018: all trims: S; 2022–2023: Essence: S (Premium and Avenir have AVK)

GM factory document — 2018 buick enclave fleet order guide wayback, p.1.
GM factory document — 2022 buick enclave order guide copy nhtsa docket, p.5, p.23.
GM factory document — 2023 buick enclave order guide copy autoevolution wayback, p.5, p.22.

Encore GX — VSS-F (2020–2027)

2025–2027 Factory-verified

Preferred, Sport Touring: O; Avenir: S

GM factory document — 2025 buick encore gx fleet order guide, p.5.
GM factory document — 2026 buick encore gx fleet order guide, p.5.
GM factory document — 2027 buick encore gx fleet order guide, p.5.

Envista — VSS-F (2024–2027)

2025–2026 Factory-verified

Preferred, Sport Touring: O; Avenir: S

GM factory document — 2025 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2025 buick envista fleet order guide, p.3.
GM factory document — 2026 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2026 buick envista fleet order guide, p.4.

LaCrosse — E2XX, 3rd gen (2017–2019)

2017–2019 Factory-verified

2019: Base, Preferred, Sport Touring, Essence: S

GM factory document — 2017 buick lacrosse fleet order guide wayback, p.2.
GM factory document — 2018 buick lacrosse order guide copy gm authority, p.3.
GM factory document — 2019 buick lacrosse order guide copy gm authority, p.4.

LaCrosse — W-body / GMX365 (2005–2009)

2005–2009 Factory-verified

GM factory document — 2005 buick lacrosse rpo code list, p.1.
GM factory document — 2009 buick lacrosse rpo code list, p.1.

LeSabre — H-body (2000–2005)

2000–2005 Factory-verified

GM factory document — 2000 buick lesabre rpo code list, p.1.
GM factory document — 2005 buick lesabre rpo code list, p.1.

Lucerne — G-body (2006–2011)

2006 Factory-verified

GM factory document — 2006 buick lucerne rpo code list, p.1.

Regal — E2XX (2018–2020)

2018–2019 Factory-verified

2019: Preferred, Preferred II, Essence: S (2019 Sportback order guide)

GM factory document — 2018 buick regal sportback fleet order guide wayback, p.1.
GM factory document — 2018 buick regal tourx fleet order guide wayback, p.1.
GM factory document — 2019 buick regal sportback order guide copy gm authority, p.4.

This page aggregates every documented appearance of AL9 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.