Passenger & Cargo Door Unlock
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Pickup, 1999 Chevrolet Tahoe, and 1999 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
When the unlock button on the transmitter is depressed twice, the remote control door lock receiver unlocks the drivers door, and also sends a voltage signal through CKT 194 (WHT) to the door lock relay. See WIRING DIAGRAMS . This energizes the door unlock coil and voltage is sent through CKT 294 (TAN) to the right front, right rear and left rear door lock motors and to the remote control door lock receiver cavity H. The remote control door lock receiver then sends a voltage signal through CKT 56 (BLK/WHT) to the cargo door lock motor. Since CKT 295 (GRY) grounds through the door lock relay to CKT 150 (BLK) to G202, the passenger and cargo door lock motors unlock.