Replacing the radio in the 2002 GMC Sierra can bring new levels of fun and excitement to the truck. Whether you are listening to Mozart, NPR or Skrillex, the sound quality will be improved with a new OEM replacement or aftermarket head unit.
Items you will need
- Flat-head screwdriver
- Aftermarket radio faceplate spacer kit (optional)
- Aftermarket radio wiring harness kit (optional)
Engage the parking brake so that the truck does not move during this procedure. Turn the ignition on. Move the column shift lever to the lowest "1" gear setting. Turn the ignition key back to kill the power to the accessory running systems on the truck. Open the hood on the Sierra. Disconnect the negative battery cable from the battery, using a ratchet and socket.
Lower the steering wheel to the lowest possible setting. Pry the corners of the dashboard instrument panel trim bezel to release it from the dash panel. Use a flat-head screwdriver to gently pry the edges if needed. Remove the instrument trim bezel from the dash by pulling it toward you.
Push downward on the two release levers on the sides of the radio unit. Pull the radio out of the dashboard so that you can access the rear. Unplug the antenna wire and wiring harness from the back of the radio.
Install the head unit spacer kit and aftermarket radio wiring per the manufacturer's instructions, if you are installing an aftermarket radio. Connect the wires on the aftermarket wiring kit, using the hardware that comes with the kit. The connections must be exact and tight, or your radio installation will not work.
If you're installing a replacement stock radio write down the serial number of the radio before continuing. Hold the radio with one hand near the dashboard. Install the electrical connector into the rear of the radio, and press it in until it clicks and locks into position. Install the antenna into the back of the head unit. Push the radio gently into the dashboard so that it locks with the provided locking tabs. If you are using an aftermarket setup, you may have to install extra mounting screws or hardware to secure the radio.
Install the dashboard trim bezel on the dash, and press around the entire perimeter of the panel, to make sure the panel clips lock in place. Put the truck shift lever in the Park position. Turn the ignition off and remove the key. Connect the battery cable to the battery, and tighten the cable until it is snug.
Turn the ignition key to the accessories position. If you are using a factory head unit, the letters "LOC" will be displayed. Press the "MN" button until "000" is displayed on the radio. Press and hold the "MN" button until the first digits of your code correspond with the ones you got from the dealer. Press and hold the "HR" button until the last digits of the code appear. If the letters "REP" show up during this process, simply repeat the "MN" or "HR" procedure you just performed.
- Aftermarket wiring kits come with instructions for each application, based upon the year make and model of the vehicle. These instructions tell you what color wires match up between the OE stereo wiring and the wiring with the radio kit. Following these instructions exactly will result in a correct installation the first time you install the stereo.
- Several incorrect attempts at entering your radio lock code, can cause the radio to go into "INOP" mode. The car will have to be started, and power to the radio must be turned on for at least one hour, before any more attempts can be made to enter the code.
- If you've replaced your radio with another stock unit, drive to a local dealership and tell them you need to have the lock code reset on the replacement radio.