GMC Sierra 1500 - 1998 Fuse Box Diagram GMC; Sierra 1500 - 1998 Fuse Box [email protected] New . Vehicle “Break-In” Your vehicle is equipped with the Passlock . theft-deterrent system. Passlock is a passive theft-deterrent system. The . system . is armed once . the . key . is removed from the ignition. GMC Sierra mk1 (1996 - 1998) - fuse box diagram - Auto Genius Jan 12, 2017GMC Sierra mk1 (1999 – 1998) – fuse box diagram. Year of production: 1996, 1997, 1998. Instrument Panel Fuse Block. The fuse block access door is on the driver’s side edge of the instrument panel.