1993 GMC Suburban Owner's Manual - Page 76

LOCK: Thispositionlocksyourignition,steeringwheelandtransmission. It's atheftdeterrentfeature. Youwillonlybeable to removeyourkeywhenthe ignitionisturned to LOCK. Off: Thispositionletsyouturn off theenginebutstillturnthesteeringwheel. in motionwhiletheengineis off (for Use Off if youmusthaveyourvehicle example, if yourvehicleisbeingpushed). Run: Thisisthepositionfordriving. Start: This starts yourengine. Onmanualtransmissionvehicles,turningthekey to LOCK willlock thesteeringcolumnandresult in a loss of ability to steerthe vehicle.Thiscouldcause a collision, If youneed to turn theengine off whilethevehicleismoving,turnthekeyonly to OFF. Don'tmove thekeyreleaseleverwhilethevehicleismoving. If your key seems stuck in LQCK and you can't turn it, be sure it is all the way in. If it is, then turn the steering wheel left and right while you turn the key hard. But turn the key only with your hand. Using a tool to force it could break the key or the ignition switch. It: none of this works, then your vehicleneeds service. 2-1 2