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: 344064  Size: SF

Chassis Zoning Table

Callout Numbers

Zone Description

100 -199

Engine compartmen

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

Auto apply brake system

400 -499

Front axle to the rear axle, excludes engine and auto apply brake system items

500 - 599

Rear of the rear axle (tail and stop lamps items)