GMC Sierra Fuse box diagrams & schemes - imgVEHICLE GMC Sierra/Sierra Denali is also called VIA Vtrux Truck and Chevrolet Silverado LD. The engine compartment fuse block is in the engine compartment, on the driver side of the vehicle. Lift the cover to access the fuse block. A fuse puller is available in the left instrument panel fuse block. Fuse Panel Diagram: Need Diagram of the Fuse Panel for 1991 GMC SIERRA; Need diagram of the fuse panel for this vehicle please Do you. have the same Locate Fuse Box. GMC SIERRA. No Electrical Power To Brake Controller. The Brake Controller On My 2001 Gmc Sierra Works Fine With The Manual Control Lever But Not When The Brake Pedal Is Applied. The Controller.. 1991 Gmc K1500 Blows Ecm Fuse - Ask the GM Technician - GM I have a 1991 Gmc sierra k1500 that constantly blows the ecm fuse sometimes as soon as i turn on the key, i pulled the fuel pump relay and its still blows. I changed the ecm module and it still blows, unhooked the oil pressure switch and it still blows. If i let it sit for awhile and plug in a ne..