You have to take out the pinch bolt that holds the lock assy in. Once it is out, you will have to turn the tumbler to position 2 (if it is out, you are in the correct position), then push the little button that holds in the lock. It is located toward the steering wheel and is small. I usually use a 90 degree pick to do the job.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS