Remove the battery, then take off the cover from the fuse/relay box. Open the cover, remove the nut, and detach the battery positive cable from the fuse/relay box by taking off the nut that secures it. For 2015 and earlier models (and 2016 Malibu Limited), take out the fuse/relay box mounting bolts, release the retaining tabs, and detach the box from its base. For 2016 and later models (except Malibu Limited), raise the fuse box arms, swing them 90 degrees, and lift the fuse box off its base by pivoting the bail arms upwards to release it and gently working it free. Installation is the reverse of removal.