Radio, AM/FM stereo, seek and scan, compact disc, digital clock, Delco/Bose speakers

Years 1991–92, 2015–18 Models 2 Factory citations 6

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Also described as Radio, AM/FM with CD player

Documented applications

Caprice — fourth generation, B-body (1991–1996)

1991–1992 Factory-verified

Delco/Bose Silver Series (1991 guide); the 1991 guide prints UIB

GM Heritage factory kit — 1991 Chevrolet Caprice, p.4, p.82.
GM Heritage factory kit — 1992 Chevrolet Caprice, p.45.

City Express (2015–2018)

2015–2018 Factory-verified

2018 guide: 1LS, 1LT: S; not with CWM

GM factory document — 2015 chevrolet city express electrical body builders manual service manual 2015 en us, p.9.
GM factory document — 2017 chevrolet city express electrical body builders manual service manual 2017 en us, p.9.
GM factory document — 2018 chevrolet 18 city express bodybuilders sm 2 w cvr pg, p.10.
GM factory document — 2018 chevrolet city express order guide copy gm authority, p.8, p.22.

This page aggregates every documented appearance of U1B in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.