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

Years 1998–99 Models 3 Factory citations 5

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Also documented for Chevrolet

Documented applications

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 Factory-verified

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

This page aggregates every documented appearance of UM4 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.