GMC 2004 Sierra - Manual (Page 527)

Fuses Usage
RR Wiper Not Used
SEO ACCY
Special Equipment Option
Accessory
WS WPR Windshield Wipers
TBC ACCY
Truck Body Controller
Accessory
IGN 3 Ignition, Heated Seats
4WD
Four-Wheel Drive System,
Auxiliary Battery
Fuses Usage
HTR A/C Climate Control System
LOCK (Relay)
Power Door Lock Relay
(Lock Function)
HVAC 1 Climate Control System
L DOOR
Driver’s Door Harness
Connection
CRUISE
Cruise Control, Power Take
Off (PTO)
UNLOCK (Relay)
Power Door Lock Relay
(Unlock Function)
RR FOG LP Not Used
BRAKE Anti-Lock Brake System
DRIVER UNLOCK
Power Door Lock Relay
(Driver’s Door Unlock
Function)
IGN 0 TCM
TBC IGN 0 Truck Body Controller
VEH CHMSL
Vehicle and Trailer High
Mounted Stoplamp
LT TRLR ST/TRN Left Turn Signal/Stop Trailer
LT TRN
Left Turn Signals and
Sidemarkers
VEH STOP
Vehicle Stoplamps, Brake
Module, Electronic Throttle
Control Module
RT TRLR ST/TRN Right Turn Signal/Stop Trailer
5-127