For 1990-2009 cars

Checks | Action
--- | ---
Check to see that the ignition switch is set correctly. | Reset the ignition switch.
Check the lock cylinder for damage. | Replace the lock cylinder.
Check the fust F 17 from the I/P fuse block. | Replace the fuse F 17.
Check for an open or short circuit between terminal 2 of the key interlock solenoid and the I/P fuse block. | Replace the fuse F 17.
Select the gear shift lever to "P" position. Check the resistance between the terminal 2 and 1 of the "P" position switch. | Replace the "P" position switch.
Check for an open or short circuit between the ground G 202 and terminal 1 of the key interlock unit. | Replace the open or short from the circuit.
Turn the ignition ON. Select the gear shift lever to "P" position. Check the resistance between the terminal 1 and 2 of the key interlock solenoid. | Replace the key interlock solenoid.