GM Service Manual Online
For 1990-2009 cars only

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.


Object Number: 160995  Size: MF

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