Yukon 2WD V8-5.3L VIN T (2006)
Ignition Switch Lock Cylinder: Description and Operation
KEY AND LOCK CYLINDER CODING
KEY IDENTIFICATION AND USAGE
The keys are double sided and reversible. The master key and the valet key contain transponders that are read by the theft deterrent system when the
keys are used in the ignition. The keys have 10 cuts positions (1) with 4 different depths (2).
The keys that are furnished with the vehicle are:
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The master key, that contains a transponder (3). This key will operate all of the locks on the vehicle.
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The valet key, that contains a transponder (3). This key will operate the door locks and the ignition lock only.
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The emergency key, that does not contain a transponder. This key will operate the door locks, and the IP storage compartment lock only. This key
is only intended for emergency use.
CUTTING KEYS
You can obtain the key code from the 4-digit number on the key tag that accompanies the original master and valet keys. The 4-digit key code cross
references to the cut and tumbler sequence. The keys have 10 key cut positions (1) and 4 key cut depths (2). Key cut positions are numbered 1-10,
counting from the head of the key to the tip. The key cut depths are 1 through 4, cut depth number 1 is the deepest cut. The key transponder (3) in the
master and valet key must be programmed to the vehicle. Refer to appropriate service procedure for programing the keys to the vehicle.
1. Cut a blank key to the proper depth and sequence of each of the tumbler positions.
2. Inspect the mechanical operation of the key in the lock cylinders, in the doors, the ignition switch, the rear compartment lid and any storage
compartments:With each side of the key pointing up inside the lock, inspect the operation of the lock in both directions.
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Turn the key both directions in each lock cylinder.
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Turn the key with each side of the key pointing upward in each lock cylinder.
3. If replacing a master or valet key, program the key transponder to the vehicle.
LOCK CYLINDER TUMBLER OPERATION
Each of the four cut depths on the key has corresponding tumblers, sometimes referred to as plates or wafers. The tumbler depth number is stamped on
the tumblers for identification. The IP storage compartment lock cylinder also requires a retainer tumbler. The retainer tumbler is not moved by the
key, its function is to retain the IP storage compartment lock cylinder in the lock assembly.
ASSEMBLING AND CODING IGNITION LOCK CYLINDER
The ignition lock cylinder only uses seven of the ten cut positions, 3 through 9. The tumbler positions are staggered from side to side, 4 on one side
and three on the other.
