Headlamps, high intensity discharge (HID), xenon projector, adaptive forward lighting, flash-to-pass, automatic on and off, automatic delay, warning buzzer

Years 2005–07, 2011 Models 2 Factory citations 2

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Also described as Headlamps, high intensity discharge

Also documented for Cadillac Chevrolet GMC Saturn

Documented applications

Rainier — GMT360 (2004–2007)

2005–2007 Factory-verified

GM factory document — 2005 buick rainier 2wd rpo code list, p.1.
GM factory document — 2007 buick rainier rpo code list, p.1.

Regal — Epsilon II, 5th gen (2011–2017)

2011 Confirmed

recoded T4F for 2012 (GM's 2012 list)

This page aggregates every documented appearance of TT6 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.