Chevrolet Sonic Repair Manual: Rear Compartment Lid Lock Cylinder Coding

The rear compartment lid lock cylinder uses 7 of the 7 cut positions. The tumbler positions are staggered from side to side, 4 on one side and 3 on the other, are not self-retaining, and are not snap in.

Note:

All lock cylinders for side milled keys have right and left tumblers. The location of the tooth of the tumbler determines whether it is right or left. Illustrations in this procedure show the right tumblers on the top and the left tumblers on the bottom. All tumblers are marked 1R, 1L, 2R, or 2L. The number being cut depth and the letter meaning right or left.

1. Tumbler spring (2) and tumbler (3) are to be assembled into the cylinder (1). In this case start with the tumbler nearest the cylinder head and work through until the last tumbler at the base. Use the key as a tool by pushing it in step by step to hold the already assembled tumblers in place.
2. Check the correct loading of the tumblers by inserting the key into the cylinder. All tumblers should be flush with the lock cylinder body.
3. Assemble the restoring spring (4) onto the rear of the cylinder.
4. Tape the pad (5) onto the housing (6).
5. Grease the housing.
6. Insert the lock cylinder (1) into the housing (6). Remove the key from the cylinder.
7. Install the lever (7) onto the end of the cylinder (1).
8. Attach the E-ring (8) to the cylinder, then crimp it to retain the lever assembly.
9. Snap the rod retainer (9) into the hole in the lever (7).
10. Insert the key into the lock and function the lock to check for proper assembly and smooth operation.