AT9 ✓ Factory-verified

Cadillac · Regular Production Option

Seat adjuster, power passenger lumbar control

Years 2009, 2025–26 Models 4 Factory citations 10

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Also described as Seat adjuster, front passenger 2-way power lumbarControl, seat, power lumbar, passenger

Also documented for BuickChevroletGMCOldsmobilePontiac

Documented applications

CT4 — Alpha 2 (2020–2026) →

• 2025 ✓ Factory-verified

  only in: CT4; Premium Luxury: S

  ⛭ GM factory document — 2025 cadillac ct4 fleet order guide, p.8.

STS — Sigma (2005–2011) →

• 2009 ✓ Factory-verified
  ⛭ GM factory document — 2009 cadillac sts rpo code list, p.1.

XT5 — C1XX (2017–2026) →

• 2025–2026 ✓ Factory-verified

  Premium Luxury, Sport: S; Luxury: not available

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.4.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.26.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.5.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.26.

XT6 — C1XX (2020–2025) →

• 2025 ✓ Factory-verified

  Premium Luxury: S; Sport: S

  ⛭ GM factory document — 2025 cadillac xt6 fleet order guide, p.4.

  ⛭ GM factory document — 2025 cadillac xt6 fleet order guide, p.62.

Related codes · mentioned in these notes

S

This page aggregates every documented appearance of AT9 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.