Wiring harness, light duty, trailer, five wire

Years 1983–84, 1986–90, 1998–04 Models 4 Factory citations 18

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Also described as Wiring harness, 5-lead

Also documented for Chevrolet Oldsmobile

Documented applications

Jimmy — second generation (1995–2001)

1998–2001 Factory-verified

2001 list reads car trailer; the 2000 list prints the trailer-harness line as UB1.

GM factory document — 1998 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 1999 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2001 gmc jimmy 4wd rpo code list, p.1.

Safari — First generation (1985–1994)

1986, 1987 Factory-verified

included with Z72; shared M-body code; cited from the joint Astro/Safari pages of the Astro kits.

GM Heritage factory kit — 1986 Chevrolet Astro Van, p.14.
GM Heritage factory kit — 1987 Chevrolet Astro Van, p.27.

Sonoma — first generation (1982–1993)

1983–1984, 1986–1990 Factory-verified

not with Z82; shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

GM Heritage factory kit — 1983 Chevrolet S 10, p.31.
GM Heritage factory kit — 1984 Chevrolet S 10, p.18.
GM Heritage factory kit — 1986 Chevrolet S 10, p.15.
GM Heritage factory kit — 1987 Chevrolet S 10, p.22.
GM Heritage factory kit — 1988 Chevrolet S 10, p.33.
GM Heritage factory kit — 1989 Chevrolet S 10, p.23.
GM Heritage factory kit — 1990 Chevrolet S 10, p.30.

Sonoma — second generation (1994–2004)

1998–2004 Factory-verified

2001 list reads car trailer; the 2000 list prints the trailer-harness line as UB1 and has no U89 line. The 2002–2004 lists read as the 2001 list.

GM factory document — 1998 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 1999 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2001 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2002 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2003 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2004 gmc sonoma pickup 4wd rpo code list, p.1.

This page aggregates every documented appearance of U89 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.