GMC 2003 Sierra - Manual (Page 489)

Center Instrument Panel Fuse Block
TJie center Inslrumenl pan&l ulility block Is ICKatad
undomeath the instrunrtenl panel, !o the left oi the
sloering column.
Device Usage
SEO Special, Ecfuipiment Option
TRAILER Trailer Brake Wiring
UPFIT Upfiiter [Not Used)
SL RlOE
Ride Controt Harne&s
Conneclian
HDLR 2 Headliner Wiring Coi^neclor
BODY Body Wiring Connector
DEFOG Rear Defogger Relay
HDLNR 1 Headliner Wiring Connector 1
SPARE RELAY Nol Used
CB SEAT
Dayer and Passenger Seat
Module Crrouil Breaker
CB RT DOOR
Righi Power Windows Circuit
Breaker
SPARE Not Used
INFO
Infotainment Harness
Connection
5-114