Steering Lock

Disconnect the ground cable from battery.
Remove the cover assembly - column.
1. Remove the screws by turning the steering wheel to right and left.
  
  Fig 1: Removing Cover Assembly - Column
  Courtesy of SUBARU OF AMERICA, INC.
2. Release the claw, and remove the cover assembly - column UPR and the cover assembly - column LWR.
Fig 2: Removing Cover Assembly Claw
Courtesy of SUBARU OF AMERICA, INC.
Remove the immobilizer antenna assembly .
1. Disconnect the connector.
2. Release two claws using a flat tip screwdriver or similar tool wrapped with a protection tape, and remove the immobilizer antenna assembly.
  CAUTION: Do not apply excessive force to disengage the lock of immobilizer antenna assembly. Otherwise they may be broken because those parts are the products made of a plastic.
Fig 3: Removing Immobilizer Antenna Assembly
Courtesy of SUBARU OF AMERICA, INC.
Remove the key lock solenoid.
1. Disconnect the connector.
2. Remove the screws and remove the key lock solenoid.
Fig 4: Removing Key Lock Solenoid
Courtesy of SUBARU OF AMERICA, INC.
Replace the key cylinder.
1. Insert the key into the key cylinder, and turn the key to the ACC position.
2. Insert a flat tip screwdriver from the steering lock frame hole (A), and pull the key cylinder until the key cylinder claws touch the steering lock frame stopper (B).
  
  Fig 5: Releasing Key Cylinder
  Courtesy of SUBARU OF AMERICA, INC.
3. Insert a flat tip screwdriver from the steering lock frame hole (A), and release the claws to pull out the key cylinder.
Fig 6: Pulling Out Key Cylinder
Courtesy of SUBARU OF AMERICA, INC.
Install each part in the reverse order of removal.