GM Service Manual Online
For 1990-2009 cars only

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


Object Number: 427866  Size: LH

Chassis Zoning Table

Callout Numbers

Zone Description

100-199

Engine compartment

Important: 001-099 are additional numbers for the engine compartment (these are only used if all the 100-199 numbers are used)

200-299

Within the instrument panel area

300-399

Chassis area (between the front and the rear wheels)

400-499

Rear of the rear axle (tail and stoplamps items)