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Automobile Lock Servicing
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Pre-1970 models have the code for the primary lock stamped on the door locks. A post-1973 GM vehicle uses a primary key that fits only the ignition lock; its secondary key operates the other locks. Until the late 1970s, the secondary key code number could be found on the vehicle s glove-compartment lock. The glove-compartment lock has four tumblers that correspond to the last four tumblers of the trunk lock (the trunk lock has six tumblers).
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Fitting a key
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Fit a primary key for a pre-1970 GM vehicle by removing the door lock and using the code number stamped on it. To fit a primary key for a 1970 to 1973 model, remove, disassemble, and decode the door lock. Lock decoders are available from locksmith supply houses for this purpose. For a 1974 to 1978 GM vehicle, save time by just pulling the ignition lock and installing a new one. Otherwise, you must disassemble the steering wheel column. A primary key can be fitted to a post-1978 GM model (not including vehicles with VATS or PASSKey) by disassembling the steering wheel column, removing the lock, and using the code stamped on the lock. To fit a key for a secondary GM lock, remove the glove-compartment plug and cut the key by code. Some GM glove-compartment locks are tricky to remove without using a bezel nut wrench. The plug can be removed as follows: Pick the lock open if it s locked, open the door, and then pick the lock back to the locked position. Insert an ice pick or similar instrument in the small poke hole, and depress the retaining pin. You should be able to remove the plug easily. If no code is available, fit a key to the glove-compartment lock, and use the following GM progression method to find the remaining two cuts.
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The GM progression method
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Since 1967, GM has adhered to the following three rules for making a factoryoriginal key:
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The sum total of the cut depths must equal an even number. There cannot be a more than two cut-depth difference between any adjacent cuts. There can never be more than two of the same cut depths in a row.
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The GM progression method is based on logically using these rules to progressively decrease the possible key-cut combinations until the proper combination is determined. The first rule refers to the fact that whenever the cut-depth numbers of a GM key are added together, the sum should be an even number. A GM key may have the cut-depth numbers 3-2-4-3-2 (which equals 14), for example, but not 3-2-4-3-3 because the sum of the latter is an odd number. Suppose that you obtained four cut depths from a glove-compartment lock and need to find the remaining two cuts for operating the trunk lock. If the sum of the four cut depths is an odd number, the two unknown depths also must equal an odd number because any odd number plus any other odd number
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Fifteen
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always equals an even number. If the sum of the four cut depths is an even number, the remaining two must equal an even number because any even number plus any other even number always equals an even number. Likewise, any odd number plus any even number equals an odd number. The second of the three rules refers to the fact that cuts directly next to each other should never differ by more than two cut depths. For example, a No. 1 cut depth should not directly precede or follow a No. 4 cut depth. The third of the three rules means that no GM key should have three consecutive cuts of the same depth. A key bitting of 2-2-2-3-1, for example, is forbidden. Using these three rules, it s easy to use the four cut depths found on a glovecompartment lock to figure out the remaining two cuts for the trunk lock. First, make a key with those four cuts; the first and second spaces on the key should be left uncut. There are only 25 possibilities for the first two cuts (five possible depths for two spaces equals 5 2, or 25). The 25 possible depths for the two remaining spaces are 1-1, 1-2, 1-3, 1-4, 1-5, 2-1, 2-2, 2-3, 2-4, 2-5, 3-1, 3-2, 3-3, 3-4, 3-5, 4-1, 4-2, 4-3, 4-4, 4-5, 5-1, 5-2, 5-3, 5-4, and 5-5. Based on the second GM keying rule, 6 of those 25 possible depths can be ignored because they have more than two depth increments between them. They are 1-4, 1-5, 2-5, 4-1, 5-1, and 5-2. This leaves only 19 possible depth combinations in any instance where the first two depth cuts must be found for a GM vehicle. Based on the first GM keying rule, you can eliminate about half those 19 possibilities immediately. You would eliminate either all the odd pairs or all the even pairs depending on whether you need a pair that equals an even number or a pair that equals an odd number. If you need a pair that equals an even number, you would have only the following 11 choices: 1-1, 2-2, 3-3, 4-4, 5-5, 3-1, 4-2, 5-3, 1-3, 2-4, and 3-5. If you need a pair that equals an odd number, you would have only the following 7 choices: 2-1, 1-2, 3-2, 2-3, 4-3, 5-4, and 4-5. The second GM rule then would allow you to eliminate several more of those pairs. If your four glove-compartment lock cut depths are 1-1-2-3, for example, then the second rule would be violated by preceding those cuts with cuts 3-4, 5-4, or 4-5. If a No. 4 or No. 5 depth cut were next to a No. 1 cut on a key, the key would have adjacent cuts with more than 2 cut-depth differences. This means that only five possible cuts would be available: 1-2, 2-3, 2-1, 3-2, and 4-3. Using the same glove-compartment lock cut depths as the example, you then would take the key and cut a No. 2 depth in the first space and a No. 1 depth in the second space; then try the key in the lock. If the key doesn t work, you would then progress to cutting a No. 3 depth in the first space and a No. 2 depth in the second space (both spaces would be cut a little deeper). After cutting three of the five possibilities, you would then need to use another key with the four cuts from the glove compartment on it to cut the remaining two pairs of depths on that key, beginning with the shallowest pair. One of them will operate the lock. By using the GM progression method, you should never have to waste more than one key blank if you re searching for an odd combination for the two cuts. You
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