1999 GMC Sierra 1500 Pickup Owner's Manual - Page 79

LOCK: Thispositionlocksyourignition,steeringwheelandtransmission.It's a theft deterrent feature. You will only be able to remove your key when the ignitionisturned to LOCK. Off: This position lets you turn off theenginebutstillturnthesteeringwheel. in motionwhiletheengineis off (for UseOff if youmusthaveyourvehicle example, if yourvehicleisbeingpushed). Run: Thisisthepositionfordriving. Start: This starts your engine. On manual transmission vehicles, turning key the to LOCK will lock A the steering column and result in a loss of ability to steer the If youneedtoturntheengine vehicle.Thiscouldcauseacollision. off whilethevehicleismoving,turnthekeyonly to OFF. Don'tmove thekeyreleaseleverwhilethevehicle is moving. A I I NOTICT - f yourkeyseemsstuck in LOCK and you can't turn it, be sure it is all left andrightwhileyou :hewayin. If it is,thenturnthesteeringwheel :urnthekeyhard.Butturnthekeyonlywithyourhand.Usingatoolto 'orce it couldbreakthekey or theignitionswitch. If none of this works, :henyourvehicleneedsservice. Key Release Levc- KO495 The ignition k e y cannot be removed from the ignition vehiclesunlessthekeyreleaselever is used. 2-1 1 of manual transmission