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Truck Zoning

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that corresponds to where they are located in the vehicle. The following table explains the numbering system.

Fig 1: Truck Zoning
GM160995Courtesy of GENERAL MOTORS CORP.
Truck Zoning

Callout Numbers Zone Description
100-199 Engine compartment (All forward of the dash panel)
001-099 are additional for the engine compartment (Only to be used if all 100-199 items are used)
200-299 Within the instrument panel area
300-399 Passenger compartment /truck bed (From instrument panel to the rear wheelhouse)
400-499 Truck bed (From the instrument panel to the rear wheelhouse)
500-599 Within the left front door
600-699 Within the right front door
700-799 Within the left rear door
800-899 Within the right rear door
900-999 Within the endgate door