The Chevrolet Blazer was introduced in the early-1980s alongside its twin vehicle, the GMC Jimmy. The Blazer was discontinued after the 2005 model, and replaced with the Chevrolet Trailblazer (which actually made its debut a few years earlier). The Blazer's body style remained the same towards the end of its life cycle (1998 to 2005); most interior components, including the stereo, remained the same. The process of removing the stereo from your 1998 to 2005 Chevy Blazer isn't difficult; however, certain precautions need to be taken.
Open the hood, locate the battery, and disconnect the negative battery cable (marked with a minus sign) with the pliers. Wait at least 10 minutes to eliminate the reserve power supply (this is to disarm the safety restraint system; you will be working near the airbag).
Inspect the odometer cluster, where the speedometer and tachometer are located. Look directly above the gauges to find a 7mm bolt. Remove it with the socket wrench.
Remove the two 7mm bolts from the lower steering column panel (one bolt on each side of the steering wheel). Pull the panel partially away from the steering column. Remove the single Phillips head screw behind the panel (left side of steering wheel).
Grasp the lower-right corner of the stereo/air vent panel. Begin pulling the panel toward you, and then work your way to the upper-right corner, and the top part of the panel (above the steering column).
Position the panel away from the stereo, to allow suffice room to remove the stereo. It is not necessary to completely remove the panel.
Remove the two 7mm bolts that attach the stereo to the dash. Pull the stereo out carefully, and then unplug the antenna cable and the wiring harness.
