Radio, AM stereo/FM stereo, DSP, WX, HPS, RDS, seek/scan, automatic reverse music search cassette, multiple compact disc, clock, ETR

Years 1998–05 Models 4 Factory citations 16

Also described as Radio, AM stereo/FM stereo, DSP, WX, HPS, RDS, seek/scan, auto reverse, music search cassette, MCD, clock, ETR

Documented applications

DeVille — G-body (2000–2005)

2000–2005 Factory-verified

the 2000–2003 lists misspell stereo.

GM factory document — 2000 cadillac deville rpo code list, p.1.
GM factory document — 2002 cadillac deville rpo code list, p.1.
GM factory document — 2003 cadillac deville rpo code list, p.1.
GM factory document — 2004 cadillac deville rpo code list, p.1.
GM factory document — 2005 cadillac deville rpo code list, p.1.

DeVille — K-body (1994–1999)

1998–1999 Factory-verified

GM factory document — 1998 cadillac deville rpo code list, p.1.
GM factory document — 1999 cadillac deville rpo code list, p.1.

Eldorado — E-body (1992–2002)

1998–1999 Factory-verified

GM factory document — 1998 cadillac eldorado rpo code list, p.1.
GM factory document — 1999 cadillac eldorado rpo code list, p.1.

Seville — G-body (1998–2004)

1998–2004 Factory-verified

GM factory document — 1998 cadillac seville rpo code list, p.1.
GM factory document — 1999 cadillac seville rpo code list, p.1.
GM factory document — 2000 cadillac seville rpo code list, p.1.
GM factory document — 2001 cadillac seville rpo code list, p.1.
GM factory document — 2002 cadillac seville rpo code list, p.1.
GM factory document — 2003 cadillac seville rpo code list, p.1.
GM factory document — 2004 cadillac seville rpo code list, p.1.

This page aggregates every documented appearance of UM9 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.