Ignition Switch & Lock Cylinders: Operation: "Lock"

Key can only be moved to "LOCK" position with transmission linkage in "PARK" or "REVERSE". When a slot in shifter bowl lock bracket (in steering column) is aligned with a raised step on the ignition lock actuating rod rack which allows the rack to move into the locked position. The step then locks the shifter bowl lock bracket to prevent shifting of the transmission. At the same time, lock cylinder moves a spring loaded lock bolt up into engagement with one of twelve slots in a lock plate splined on upper end of steering shaft. This action locks steering wheel (if lock bolt not aligned with a lock plate slot, spring will be compressed and lock bolt will engage slot when steering wheel is turned slightly). If ignition key is left in ignition switch in "LOCK" position, key warning buzzer will sound in usual manner when front door on drivers side is opened.

NOTE: On models with floor mounted shift linkage, steering column incorporates a shifter tube and lock bracket which is similar to that used with steering column mounted shift linkage. An interlock linkage (cable or rod) is used between the lower end of the shifter tube and transmission case shift lever to provide a back-drive so that ignition switch locking feature operates in same manner for all transmission types.