GM Service Manual Online
For 1990-2009 cars only

Object Number: 65474  Size: SH

Vehicle Identification Number (VIN) System

The vehicle identification number (VIN) plate (1) is the legal identifier of the vehicle. The VIN plate is located on the upper left corner of the instrument panel (I/P) and can be seen through the windshield from the outside of the vehicle.

Position

Definition

Character

Description

1

Country of Origin

1

Canada

2

Manufacturer

G

General Motors

3

Make

1

Buick

4

5

Carline/Series

WS

Century

6

Body Style

5

Four-Door Sedan (GM Style 69)

7

Restraint System

4

Active Belt Manual w/Driver and Passenger Inflatable Restraint System Frontal

8

Engine Type

J

RPO LG8, 3.1 Liter, 6-Cylinder, SFI

9

Check Digit

X

Check Digit

10

Model Year

5

2005

11

Plant Location

4

Oshawa #2, ON

12-17

Plant Sequence Number

W

400001

VIN Derivative Characters

Position

Definition

Character

Description

All engines and transmissions are stamped or laser etched with a partial Vehicle Identification Number (VIN). This table identifies the different VIN derivative characters and their respective positions.

1

Division

4

Buick

2

Model Year

5

2005

3

Plant Location

4

Oshawa #2, ON

4-9

Plant Sequence Number

W

400001

A VIN derivative can be used to determine if a vehicle contains the original engine or transmission by matching the VIN derivative positions to their accompanying positions in the complete VIN.

4T65-E Transmission ID and VIN Derivative Locations

Refer to Transmission Identification Information in Automatic Transaxle - 4T65-E.

Engine ID and VIN Derivative Location

The eight digit of the vehicle identification number (VIN) is the engine code letter, which identifies the engine.

The adhesive backed labels attached to the engine, laser etching, or stamping in the engine block indicate the engine unit number/build date code.

The primary location of the VIN derivative for the 3100 LG8 engine is above the starter motor on the engine block.

3.1L LG8 Engine ID and VIN Derivative Location,

Refer to Engine Identification in Engine Mechanical - 3.1L.

Engine and Transmission Usage

Model

Engine

Transmission

Base

Option

Base

Option

Century

3.1 Liter, 6-Cylinder, SFI (LG8)

x

Automatic 4 Speed 4T65-E (M15)

x