1993 GMC Sonoma Owner's Manual - Page 82

Features & Contrvls 2. 4HI: Thissetting engages yourfrontaxle to helpdriveyourvehicle. Use 4HI whenyouneedextratraction,suchasonsnowyoricyroads, or in mostoff-roadsituations. 3. 4LO: Thissettingalsoengagesyourfrontaxletogiveyouextratraction. Youmay neverneed 4LO. It sendsthemaximumpowerto all four wheels. You mightchoose4LO if youweredrivingoff-roadinsand, mud,ordeepsnowandclimbingordescendingsteephills. Indicatorlightsontheswitchshowyouwhichsettingyouarein.Both on theignition. If both indicatorlightswillcomeonbrieflywhenyouturn lightsdonotcomeon,youshouldtakeyourvehicle in forservice. The 4HI positionhasagreenindicatorlightandthe 4LO positionhasanamber indicatorlight.Whenshiftingfrom 4HI to 4LO or 4LO to 4HI, theindicator lightwillflashuntiltheshift is completed. Two-WheelDrive, "TWOWHEEL", doesnothaveaswitchpositionoran indicatorlight. Your vehiclewillbe in twowheeldrive if neitherindicatorlight is on. To shiftfromtwo-wheeldrive,"TWOWHEEL",to4HI: Pressandrelease the 4HI switch.Thiscan be doneatanyspeed,andthefrontaxlewilllock automatically. To shiftfrom4HItotwo-wheeldrive, "TWO WHEEL": Press and release the 4HI switch.Thiscanbedoneatanyspeed,andthefrontaxlewillunlock automatically. To shiftfromtwo-wheel drive, "TWO WHEEL", or 4HI to4LO: Stopyour vehicle.Shiftyourtransmissioninto N (Neutral)ordepressyourclutchpedal. Pressandreleasethe 4LO switch. You mustwaitfortheamber 4LO indicatorlighttostopflashing and gosolidamberbeforeshiftingyour transmissionintogearorreleasingtheclutchpedal. If the 4LO switchispressedwhenyourvehicleisingearand/ormoving,the 30 secondsandnotcompletetheshift amber 4LO indicatorlightwillflashfor unlessyourvehicleisbelow 3 mph andthetransmission is in N (Neutral) or theclutchpedaldepressed. If yourtransfercasedoesnot Onautomatictransmissionequippedvehicles: shiftinto 4L0, yourtransmissionindicatorswitchmayrequireadjustment.With yourtransmissionin N (Neutral),pressandreleasethe 4LO switch.Whilethe amber 4LO indicatorlight is flashing,shiftyourtransmissioninto P (Park). Wait until the 4L0 indicatorlightgoessolidamberbeforeshiftingyour transmissioninto gear.Thiswillgetyouinto 4L0, butyoushouldtakeyour vehicle in forservice so normaloperation can berestored. 2-30