Key And Lock Cylinder Coding - GMC Chevrolet Camaro 1998 Service Manual

)
)
General Information
Abbreviations Table (cont'd)
Abbreviation
Meaning
Vac Vacuum
VAC Vehicle Access Code
VATS
Vehicle Anti-Theft System
VCM Vehicle Control Module
VDOT
Variable Displacement Orifice Tube
VDV
Vacuum Delay Valve
vel velocity
VES Variable Effort Steering
VF
Vacuum Fluorescent
VIO Violet
VIN Vehicle Identification Number
VMV Vacuum Modulator Valve
VR Voltage Regulator
V ref Voltage Reference
vss
Vehicle Speed Sensor
w
w/ with
W/B
Wheel Base
WHL Wheel
WHT
White
w/o without
WOT Wide Open Throttle
W/P Water Pump
W/S
Windshield
wss
Wheel Speed Sensor
WU-OC
Warm Up Oxidation Converter
(Catalytic)
WU-TWC
Warm Up Three Way Converter
(Catalytic)
x
X-valve Expansion valve
y
yd yard{s)
YEL Yellow
Key and Lock Cylinder Coding
Key Identification and Usage
The lock cylinder keyway is designed so that other
model keys will not enter a current model lock cylinder.
A single key is used for all locks on the vehicle.
The key identification is obtained from the
four-character key code stamped on the knockout
portion of the key head. Knock the plugs out of the key
head after code numbers have been recorded. The
code list, available to owners of key cutting equipment
from equipment suppliers, determines the lock
combinations from the code numbers.
If the code numbers are not available from the records
or from the knockout plug, lay the key on the key
code diagram in order to determine the lock
combinations (the tumbler numbers and the position
arrangement).
General Information 0-25
Cutting Keys
1
2
65495
After the code has been determined from the code list
or the key code diagram, perform the following steps:
1. Cut a blank key to the proper level (1) of each
of the tumbler positions (2).
2. Inspect the key operation in the lock cylinder.
Replacement Lock Cylinders
New lock cylinders (except ignition lock cylinders) are
available from the service parts warehouse with
new lock cylinder locking bars. The tumblers are also
available and must be assembled into the cylinder
as recommended. For additional information, refer to
the following.
Lock Cylinder Tumbler Operation
All lock tumblers are shaped alike with the exception
of the notched position on one side. As the key is
inserted into the lock cylinder, the tumblers are
lowered to the correct height so that notches on each
tumbler are at the same level. When the notches
on all six tumblers line up, two small springs push the
side bar into the .notches, allowing the cylinder to
turn in the cylinder bore. Five types of tumblers are
used in making the lock combinations, and each
is coded and stamped with a number between 1 and 5.