Assembling and Coding Rear Compartment Lid Lock

The rear compartment lock cylinder only uses 7 of the 10 cut positions, 3-9. The tumbler positions are staggered from side to side, four on one side and three on the other.

1. Hold the cylinder (5) so that the side with the four tumbler spring wells faces up.
Fig 1: Exploded View Of Rear Compartment Lid Lock
Courtesy of GENERAL MOTORS CORP.
2. Insert the tumbler springs (4) into the four spring wells.
3. Install the tumblers (3) for key cut position three in the slot nearest to the front of the lock cylinder.
4. Install the three remaining tumblers, key cut positions 5, 7 and 9, on this side of the lock cylinder.
5. Snap the tumblers into place with light hand pressure.
6. Verify for the correct loading of the tumblers by inserting the key into cylinder. All of the tumblers should be flush with the lock cylinder.
7. Turn the cylinder so that the side with three tumbler spring wells faces up.
8. Insert the tumbler spring into the three spring wells.
9. Install the tumbler for key cut position four into the slot nearest to the front of the lock cylinder.
10. Install the two remaining tumblers, key cut positions 6 and 8, on this side of the lock cylinder.
11. Snap the tumblers into place with light hand pressure.
12. Verify for the correct loading of the tumblers by inserting the key into the cylinder. All of the tumblers should be flush with the lock cylinder.
13. Lightly lubricate the tumbler surfaces using the provided lubrication.
14. Install two springs (12) into the two spring wells in the head of the door lock cylinder.
15. Snap the shutter assembly (2) onto the cylinder.
16. Place the detent spring (6) into the spring well located on the side of the lock cylinder.
17. Carefully place the detent ball (1) on the detent spring.
18. Depress the detent ball and spring and insert the cylinder and insert into the cylinder case (7). Ensure the detent ball and spring is not dropped.
19. Install the lock cylinder cap (8) by aligning the notch in the cap with the large drain slot in the case. Press the cap into place with light hand pressure.
20. Install rod clip (10) in hole at end of pawl (9) to ensure it matches the assembly being replaced.
21. Install the lock pawl clip assembly matching the orientation when the lock was removed.
22. Install the lock pawl E-clip (11) to retain the lock pawl.
23. Insert the key into the lock and function lock to ensure for proper assembly and smooth operation.