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Home >> GMC >> 1999 >> Yukon Base, 4WD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Remote Keyless Entry Systems >> Description & Operation (Standard Keyless Entry System) >> Standard Keyless Entry System >> Locking
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Standard Keyless Entry System: Locking

Press the LOCK button on the transmitter to lock all of the vehicles doors at once. Press the LOCK button a second time to verify that the doors are locked. A horn will sound to verify that the doors are locked.