Servicing the Buick Enclave, Chevrolet Traverse, GMC Acadia & Saturn Outlook

All four use the GM Z-Keyway system and the “Circle Plus” transponder system. All can be programmed with the standard GM on-board programming procedure, which takes 30 minutes.


All four of these vehicles share the same platform, door construction, steering column, and the same lock system. Three were introduced in the 2007 model year, with the Chevrolet Traverse introduced for the 2009 model year. All four use the GM Z-Keyway system and the “Circle Plus” transponder...


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After the lock has been removed from the steering column (Photo 40), it can be easily disassembled and serviced. The active retainer does double duty by holding the lock in the column and to hold the ignition lock itself together. Once the lock has been removed from the column, the outer shell of the lock can be removed by depressing the retainer and sliding the shell off the end of the plug.


At the rear of the cylinder, Photo 41 shows the portion of the key buzzer assembly that contacts the piece of the buzzer switch that we saw earlier inside the lock housing. The pin in the housing is spring loaded and maintains pressure on the white nylon shaft.


Photo 42 shows the lock plug with the shell removed and the active retainer and spring. The small tab on the bottom of the retainer is normally trapped under the shell, so that the retainer will not come out until the shell has been removed. When the shell is removed, the retainer will shoot out and get lost if you are not ready for it. The key buzzer activator may also fall out.
Photo 43 shows the link in the key buzzer activator in place in its socket in the side of the lock plug. When the key is inserted, the link is levered to the rear against the end of the nylon pin, which activates the key buzzer switch.


In photo 44, the key buzzer link has been removed from the lock. The shape of the link will keep you from putting it back in incorrectly. If the link is in upside down, the lock shell will not fit back over the plug.


Photo 45 shows the ignition lock tumblers. The tab on the side of each wafer acts as a retainer, so you will have to snap the wafers into and out of the lock. I use a small screwdriver for both operations. Each of these tumblers is stamped with just the depth of the cut, but the numbers are very small.


The Outlook and its sister vehicles are somewhat odd because the locks are very similar to the Flip-Key system, yet are fitted for the Z-keyway blanks and tumblers. I would not be surprised in the least to see these vehicles change over to the Flip-Key system in the near future.

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