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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 Circuit Description >> Driver, Passenger & Cargo Doors Lock
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Driver, Passenger & Cargo Doors Lock

When the lock button on the transmitter is depressed, the remote control door lock receiver sends a voltage signal through CKT 195 (LT BLU) to the door lock relay. See WIRING DIAGRAMS  . This energizes the door lock coil and voltage is sent through CT 295 (GRY) to the left front, right front, right rear, left rear and cargo door lock motors.

Since CKT 694 (TAN) internally grounds the left front door lock motor in the remote control door lock receiver, CKT 294 (TAN) grounds the right front, right rear and left rear door lock motors through the door lock relay to CKT 150 (BLK) to G202, and CKT 56 (BLK/WHT) grounds the cargo door lock motor through the remote control door lock receiver back to CKT 294 (TAN), all doors lock.