GMC Sierra Classic 2007 Owner's Manual page 597

Fuses
RR WPR
SEO ACCY
WS WPR
TBC ACCY
IGN 3
Usage
Not Used
Special Equipment Option
Accessory
Windshield Wipers
Truck Body Controller
Accessory
Ignition, Heated Seats
Fuses
4WD
HTR A/C
LOCK (Relay)
HVAC 1
LT DR
CRUISE
UNLCK (Relay)
RR FOG LP
BRAKE
DRIVER UNLCK
IGN 0
TBC IGN 0
VEH CHMSL
LT TRLR ST/TRN
Usage
Four-Wheel Drive System,
Auxiliary Battery
Climate Control System
Power Door Lock Relay
(Lock Function)
Climate Control System
Driver's Door Harness
Connection
Cruise Control, Power Take
Off (PTO)
Power Door Lock Relay
(Unlock Function)
Not Used
Anti-Lock Brake System
Power Door Lock Relay
(Driver's Door Unlock
Function)
TCM
Truck Body Controller
Vehicle and Trailer High
Mounted Stoplamp
Left Turn Signal/Stop Trailer
597