GM 25925580
Fuse Box

The first step to replace the underhood electrical center or junction block requires removing the negative Battery Cable. Open the junction block cover by equally pushing tabs downward followed by lifting it off. Pull upward at the fuse relay center cover to unhinge its retainers before removal. The location of each harness end bolt needs to be noted then those bolts need to be removed so harness ends can be detached from the fuse relay center. Unbolt the fuse relay center from its position then take out the fuse relay center from the junction block bracket. Separate the wiring harness ends from the bottom of the fuse relay center by pulling downwards before you remove the retaining bolts of the junction block bracket in order to take out the bracket from the vehicle. Set the junction block bracket in position before securing bolts with a torque of 6 n.m and an amount of 53 lb in. After alignment of the wiring harnesses you should install the fuse relay center by securing it with bolts tightened at 6 n.m (53 lb in). Use the harness end bolts to attach the parts before setting the fuse relay center cover over the relay center bolts and pressing for tab engagement. Pressing down on the junction block cover will finish the installation process by engaging its tabs.

Pull upward on the fuse relay center cover to release the retaining tabs and remove it.

Replace the rear electrical center cover, reposition the left second row seat to a passenger position for Chevrolet TrailBlazer or GMC Envoy models, or reinstall the left second row seat for Chevrolet TrailBlazer EXT or GMC Envoy XL models, and reconnect the battery negative cable.

First disconnect the negative battery cable.

Place the block base onto the floor studs and secure it with the retaining nuts, tightening them to 10 N.m (88 lb in).