Interior trim, Jet Black, leather seating surfaces with mini-perforated inserts, Luminary Precision genuine aluminum trim

Years 2015, 2018–20, 2025–26 Models 5 Factory citations 9

Also described as Interior, Jet Black with Jet Black accents, leather seating surfaces, brushed aluminum trimInterior, Jet Black with Jet Black accents, leather seating surfaces with mini-perforated insertsInterior trim, Jet Black with Jet Black accents, leather seating surfaces with mini-perforated insertsSeat trim, leather seating surfaces with mini-perforated inserts, Jet Black with Jet Black accents

Also documented for Buick Chevrolet GMC

Documented applications

ATS — Alpha (2013–2019)

2015, 2018–2019 Factory-verified

2019 from GM Authority's 2019 ATS interior colors page

GM factory document — 2015 cadillac ats coupe fleet order guide wayback, p.3.
GM factory document — 2018 cadillac ats coupe fleet order guide wayback, p.2.
GM factory document — 2018 cadillac ats sedan fleet order guide wayback, p.2.

CT4 — Alpha 2 (2020–2026)

2020, 2025–2026 Factory-verified

CT4 Premium Luxury; Synergy finish aluminum center console trim; the 2025 guide requires the Climate Package (Y6F); seat code AQ9; 2020 from GM Authority's 2020 CT4 interior colors page

GM factory document — 2025 cadillac ct4 fleet order guide, p.34.
GM factory document — 2026 cadillac ct4 fleet order guide, p.31.

CT5 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

only in: CT5 (Premium Luxury); Brushed Aluminum trim; requires ventilated seats (KU9)

GM factory document — 2025 cadillac ct5 fleet order guide, p.28.
GM factory document — 2026 cadillac ct5 fleet order guide, p.30.

XT4 — E2 (2019–2025)

2025 Factory-verified

Premium Luxury: O; Sport: not available; requires WPC

GM factory document — 2025 cadillac xt4 fleet order guide, p.29.

XT6 — C1XX (2020–2025)

2025 Factory-verified

Sport; Twenty-Two Carbon Fiber trim with Ombre finish

GM factory document — 2025 cadillac xt6 fleet order guide, p.40.

This page aggregates every documented appearance of H1Y in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.