Just a couple of years ago, the automotive locksmith world was revolutionized by the introduction of the Lishi 2-in-1 tools. These tools have proven so effective that many of us have begun to wonder how we ever got by without them! And, as so often happens in our industry, the very effectiveness...
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Unfortunately, there are also non-sidebar versions of the lock being used as replacement locks. You must determine which lock you are servicing. Look into the ignition lock itself. If the lock has a shutter extending across the center of the keyway, then you are dealing with the sidebar lock. If the lock has no shutter across the keyway, then you are dealing with a non-sidebar lock. For this article, the only replacement lock that I could locate at any Cadillac dealer was of the non-sidebar variety.
The use of the Lishi GM-B107 direct read decoder tool is very simple. Once the tool is fully inserted into the lock, use the probe to locate the individual tumblers. Even-numbered tumblers will be on one side of the keyway and odd-numbered tumblers will be on the opposite side of the keyway. Apply pressure to the probe (no turning force is needed on the lock) and the pointer will tell you the depth of that particular tumbler. Move on to the next tumbler and repeat the process until you have completely decoded one side of the lock. Remove the tool and reverse it so that the probe points toward the other side of the key, and then re-insert the tool. Repeat the same steps on this side of the lock to finish decoding the lock. The tool only covers cuts 3 – 10 because those are the tumblers that are used in the ignition lock. After you have generated a key that will turn the ignition, you can then progress cuts 1 and 2 in the door lock.