C 3500 HD Truck 2WD V8-8.1L VIN G (2002)
Glove Compartment: Procedures
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.
Luxury Vehicle Console Key
The console key is available only on luxury vehicles. The console key is used to access or lock the center console. There is a number stamped on the key
and the lock cylinder for cutting or ordering a new key. Key information described in the following procedures does not refer to the console key. Contact
the Presto Lock Co. at 248 594-9500 and give them the cylinder code. They will supply the key cut information or provide a copy of the key.
Cutting Keys
After the code has been determined from the code list, perform the following steps:
1. Cut a blank key to the proper level of each of the tumbler positions.
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.
Assembling and Coding Ignition Lock Cylinders
Tools Required
J 41340 Ignition Lock Holding Fixture
1. Determine the tumbler numbers/arrangement:
1. Place the tip of the key directly over the tip of the illustrated key.
2. Inspect that the diagram outlines the key.
3. Starting with position 1 (open end of cylinder), find and record the lowest level (tumbler number) that is visible.
4. Repeat the previous step for positions 2-10.
