Lock/Unlock Wire Colors For A 2021 GMC Sierra 1500

Updated 08/15/2023 | Published 08/13/2023

Question:

Wiring diagram for 2021 GMC sierra 1500, for the pl9772 I purchased from you guys. Cant find color code for the lock for my truck.

asked by: Don

Expert Reply:

Depending on if you have a crew cab or not the instructions for the Pop & Lock Power Lock Conversion Kit for Truck Caps and Hard Tonneau Covers # PAL9772 lists the lock wire as Tan and the unlock wire as Blue (Gray for crew cabs). They also have an installation note which I've copied below:

On the CHEVY/GMC 03+ Two door or Extended Cab Models (if not using a relay harness) it is necessary to remove the driver’s side door panel and attach the lock and unlock wires directly to the wires of the door lock actuator inside the door. Once the door panel is removed, you will need to remove the driver’s side kick panel and fish the harness wires through the rubber boot that runs between the door and the cab of the truck and into the door. Use the supplied Wire Taps to attach to the specified wires directly under the truck’s door lock switch and test the locks. If the truck locks operate opposite the lid lock, reverse the leads connected.

They do not have a wiring diagram to add to this since it fits so many different models but I've attached a link to the instructions as well to help you.

expert reply by: Kevin C