Horn, high note (SEO)

Years 2001–03, 2005 Models 4 Factory citations 9

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Also described as Horn, dual, high note

Also documented for GMC

Documented applications

Silverado — GMT800 (1999–2007)

2001, 2005 Factory-verified

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado, p.60.
GM Heritage factory kit — 2005 Chevrolet Silverado 1500, p.196.

Silverado HD — GMT800 (2001–2007)

2001–2003, 2005 Factory-verified

years from Heritage kit pages, not in GM’s service list of that year: 2002 (kit list); 2003 (order guide); 2005 (order guide)

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2002 Chevrolet Silverado HD, p.45.
GM Heritage factory kit — 2003 Chevrolet Silverado 2500, p.235.
GM Heritage factory kit — 2005 Chevrolet Silverado 2500HD, p.208.

Suburban — GMT800 (2000–2006)

2001 Factory-verified

GM factory document — 2001 chevrolet chevy suburban 2wd rpo code list, p.1.

Tahoe — GMT800 (2000–2006)

2001 Factory-verified

GM factory document — 2001 chevrolet tahoe 2wd rpo code list, p.1.

This page aggregates every documented appearance of 7Z1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.