Radio, AM/FM stereo, seek/scan, CD, clock, equalizer, RDS, ETR

Years 2002–07 Models 3 Factory citations 7

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Also documented for Chevrolet Oldsmobile Pontiac

Documented applications

Century — W-body (1997–2005)

2004–2005 Factory-verified

GM factory document — 2004 buick century rpo code list, p.1.
GM factory document — 2005 buick century rpo code list, p.1.

Regal — W-body (1997–2004)

2004 Factory-verified

GM factory document — 2004 buick regal rpo code list, p.1.

Rendezvous — U-body / GMT257 (2002–2007)

2002–2007 Factory-verified

The 2004 and 2005 lists print a stray "R" before "Radio".

GM factory document — 2002 buick rendezvous awd rpo code list, p.1.
GM factory document — 2004 buick rendezvous awd rpo code list, p.1.
GM factory document — 2006 buick rendezvous awd rpo code list, p.1.
GM factory document — 2007 buick rendezvous fwd rpo code list, p.1.

This page aggregates every documented appearance of U1P in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.