GMC Sierra | 2001-2006 | Fuse Box Diagrams and Locations

Looking for GMC Sierra fuse box diagrams for the early 2000s models? This article covers the second-generation GMC Sierra and includes detailed diagrams for 2001, 2002, 2003, 2004, 2005, and 2006, along with clear information on fuse panel locations and a complete explanation of fuse and relay assignments (fuse layout) to help you diagnose electrical issues quickly and confidently.

Fuse Box Locations

Passenger Compartment

Instrument Panel

The fuse block access door is on the driver’s side edge of the instrument panel.

Center Instrument Panel

The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.

Engine Compartment

The under-hood fuse block in the engine compartment on the driver’s side of the vehicle near the battery.

Auxiliary Fuse Box

The auxiliary electric cooling fan fuse block is located in the engine compartment on the driver’s side of the vehicle next to the underhood fuse block.

Fuse Box Diagrams

2001, 2002

Engine compartment

Fuses and Relays

Assignment of the fuses and relays in the Engine compartment (2001, 2002)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
GLOW PLUG	Diesel Glow Plugs and Intake Air Heater
CUST FEED	Gasoline Accessory Power
STUD #1	Accessory Power/Trailer Wiring Feed
ABS	Anti-Lock Brakes
IGN A	Ignition Switch
AIR	A I R System
RAP #1	Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seat(s)
IGNB	Ignition Switch
RAP #2	Not Used
STUD #2	Accessory Power/Trailer Wiring Brake Feed
SPARE	Spare Fuse
TRLR TRN	Right Turn Signal Trailer Wiring
TRLL TRN	Left Turn Signal Trailer Wiring
IGN 1	Ignition, Fuel Controls (Relay)
INJ B	Ignition, Fuel Controls
STARTER	Starter (Relay)
PARK LP	Parking Lamps
FRT HVAC	Climate Control System
STOP LP	Exterior Lamps, Stoplamps
ECM I	PCM
ECMRPV	Fuel Controls, ECM
CHMSL	Center High Mounted Stoplamp
VEH STOP	Stoplamps, Cruise Control
TRL B/U	Backup Lamps Trailer Wiring
INJ A	Fuel Controls, Ignition
RR HVAC	Not Used
VEH B/U	Vehicle Backup Lamps
ENG 1	Engine Controls, Canister Purge, Fuel System
ETC	Electronic Throttle Control
IGNE	A/C Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A I R. System
B/U LP	Backup Lamps, Automatic Transmission Shift Lock Control System
ATC	Automatic Transfer Case
RR DEFOG	Rear Window Defogger, Heated Mirrors (Relay)
RR PRK	Right Rear Parking Lamps
ECMB	PCM
F/PMP	Fuel Pump (Relay)
O2 A	Oxygen Sensors
FUEL HT	Fuel Heater, Glow Plug and Intake Heater Controls
O2 B	Oxygen Sensors
LR PRK	Left Rear Parking Lamps
RR DEFOG	Rear Window Defogger, Heated Mirors
HDLP	Headlamps (Relay)
TRL PRK	Parking Lamps Trailer Wiring
RT HDLP	Right Headlamps
DRL	Daytime Running Lamps (Relay)
HTD MIR	Heated Mirrors
LT HDLP	Left Headlamps
A/C	Air Conditioning
AUX PWR	Cigarette Lighter, Auxiliary Power Outlets
SEO 2	Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp
SEO 1	Special Equipment Option Power, Aux Roof Mnt Lamp, Cell Phone, OnStarO
DRL	Daytime Running Lamps
A/C	A/C (Relay)
FOG LP	Fog Lamps
FOG LP	Fog Lamps (Relay)
RADIO	Audio System, Instrument Cluster, Climate Control System
CIGAR	Cigarette Lighter, Auxiliary Power Outlets
RT TURN	Right Turn Signals
BTSI	Automatic Transmission Shift Lock Control System
LT TURN	Left Turn Signals
FR PRK	Front Parking Lamps, Sidemarker Lamps
W/WPMP	Windshield Washer Pump
HORN	Horn (Relay)
IGNC	Ignition Switch, Fuel Pump, PRND321 Display, Crank
RDO AMP	Not Used
HAZ LP	Exterior Lamps, Hazard Lamps
EXP LPS	Not Used
HORN	Horn
CTSYLP	Interior Lamps
RRWPR	Not Used
TBC	Body Control Module, Remote Keyless Entry, Headlamps
*1	INJ B – Gasoline Engine and Diesel Engine.
*2	ECM I – Gasoline Engine; ECMRPV – Diesel Engine.
*3	O2 A – Gasoline Engine; FUEL HT – Diesel Engine.
*4	O2 B – Gasoline Engine; ECM l – Diesel Engine.

Instrument Panel

Fuses and Relays

Assignment of the fuses and relays in the Instrument Panel Fuse Block (2001, 2002)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
L BODY	Retained Accessory Power Relay
LOCK	Power Door Locks
DRV UNLOCK	Power Door Lock Relay
LOCK	Power Door Lock Relay
HVAC1	Climate Control System
CRUISE	Cruise Control, Instrument Panel Cluster
IGN 3	Ignition, Power Seats
4WD	Four-Wheel Drive System, Auxiliary Battery
CRANK	Starting System
INT PRK	Parking Lamps, Sidemarker Lamps, Interior Lamps
LDOOR	Power Door Lock Relay
BRAKE	Anti-Lock Brake System
RR WIPER	Not Used
ILLUM	Interior Lamps
SEAT	Power Seat Circuit Breaker
TURN	Exterior Lamps, Turn Signals, Hazard Lamps
UNLOCK	Power Door Locks
HTR A/C	Climate Control System
WSWPR	Windshield Wipers
IGN 1	Ignition, Instrument Panel
AIRBAG	Air Bag
MIR/LOCK	Power Mirrors, Power Door Locks
DR LOCK	Power Door Locks
PWR WDO	Power Window Circuit Breaker
UNLOCK	Power Door Lock Relay
IGN 0	PRND321 Display, Odometer, PCM
SEO IGN	Special Equipment Option, Ignition, Manual Selectable Ride
SEO ACCY	Special Equipment Option Accessory, Cellular Telephone
RAP #1	Retained Accessory Power Relay
RDO 1	Audio System
RAP #2	Not Used

Center Instrument Panel

Fuses and Relays

Assignment of the fuses and relays in the Center Instrument Panel Fuse Block (2001, 2002)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
SEO	Special Equipment Option
HTD ST	Heated Seats
SPARE 4	Not Used
VANITY	Headliner Wiring
TRAILER	Trailer Brake Wiring
PWR ST	Power Seats
SPARE 5	Not Used
CLUTCH	Manual Transmission Clutch Switch
UPF	Upfttter
PARK LAMP	Parking Lamps (Relay)
FRT PRK EXPT	Not Used (Fuse)
SL RIDE	Manual Selectable Ride Switch
SPARE 2	Not Used
RR PRK LP	Not Used (Relay)
RR FOG LP	Not Used (Relay)
SPARE 3	Not Used
IN ADV PWR	Interior Lights Feed
CTSYLP	Courtesy Lamps
CEL PHONE	Cellular Telephone Wiring

2003, 2004

Engine compartment

Fuses and Relays

Assignment of the fuses and relays in the Engine compartment (2003, 2004)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
GLOW PLUG	Diesel Glow Plugs and Intake Air Heater
CUST FEED	Gasoline Accessory Power
STUD #1	Auxiliary Power (Single Battery and Diesels Only)/ Dual Battery (TP2) Do not install fuse.
MBEC	Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors
BLOWER	Front Climate Control Fan
LBEC	Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet-Rear Cargo Area and Instrument Panel
STUD 2	Accessory Power/Trailer Wiring Brake Feed
ABS	Anti-Lock Brakes
VSES/ECAS	Vehicle Stability
IGN A	Ignition Power
IGN B	Ignition Power
LBEC 1	Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module
TRL PARK	Parking Lamps Trailer Wiring
RR PARK	Right Rear Parking and Sidemarker Lamps
LR PARK	Left Rear Parking and Sidemarker Lamps
PARK LP	Parking Lamps Relay
STARTER	Starter Relay
INTPARK	Interior Lamps
STOP LP	Stoplamps
TBC BATT	Truck Body Controller Battery Feed
SUNROOF	Sunroof
SEO B2	Off-Road Lamps
4WS	Vent Solenoid Canister/Quadrasteer Module Power
RR HVAC	Not Used
AUX PWR	Auxiliary Power Outlet — Console
IGN 1	Ignition Relay
PCM 1	Powertrain Control Module
ETC/ECM	Electronic Throttle Control, Electronic Brake Controller
IGNE	Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay
RTD	Ride Control
TRL B/U	Backup Lamps Trailer Wiring
PCM B	Powertrain Control Module, Fuel Pump
F/PMP	Fuel Pump (Relay)
B/U LP	Back-up Lamps, Automatic Transmission Shift Lock Control System
RR DEFOG	Rear Window Defogger
HDLP-HI	Headlamp High Beam Relay
PRIME	Not Used
O2B	Oxygen Sensors
SIR	Supplemental Inflatable Restraint System
FRT PARK	Front Parking Lamps, Sidemarker Lamps
DRL	Daytime Running Lamps (Relay)
SEO IGN	Rear Defog Relay
TBC IGN1	Truck Body Controller Ignition
HI HDLP-LT	High Beam Headlamp-Left
LH HID	Not Used
DRL	Daytime Running Lamps
IPC/DIC	Instrument Panel Cluster/Driver Information Center
HVAC/ECAS	Climate Control Controller
CIGLTR	Cigarette Lighter
HI HDLP-RT	High Beam Headlamp-Right
HDLP-LOW	Headlamp Low Beam Relay
A/C COMP	Air Conditioning Compressor
A/C COMP	Air Conditioning Compressor Relay
RRWPR	Not Used
RADIO	Audio System
SEO B1	Mid Bussed Electrical Center, Rear Heated Seats, HomeLink
LO HDLP-LT	Headlamp Low Beam-Left
BTSI	Brake Transmission Shift Interfock System
CRANK	Starting System
LO HDLP-RT	Headlamp Low Beam-Right
BTSI	Brake Transmission Shift Interlock System
CRANK	Starting System
LO HDLP- RT	Headlamp Low Beam-Right
FOG LP	Fog Lamp Relay
FOG LP	Fog Lamps
HORN	Horn Relay
W/S WASH	Windshield Washer Pump Relay
W/S WASH	Windshield Washer Pump
INFO	OnStar/Rear Seat Entertainment
RADIO AMP	Radio Amplifier
RH HID	Not Used
HORN	Horn
EAP	Not Used
TREC	All-Wheel Drive Module
SBA	Supplemental Brake Assist
*1	— Gasoline Engine and Diesel Engine.
*2	— Gasoline Engine; ECMRPV – Diesel Engine.
*3	— Gasoline Engine; FUEL HT – Diesel Engine.
*4	— Gasoline Engine; ECM I – Diesel Engine.
*5	IGN/EDU

Instrument Panel

Fuses and Relays

Assignment of the fuses and relays in the Instrument Panel Fuse Block (2003, 2004)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
RR Wiper	Not Used
SEO ACCY	Special Equipment Option Accessory
WSWPR	Windshield Wipers
TBC ACCY	Truck Body Controller Accessory
IGN 3	Ignition, Heated Seats
4WD	Four-Wheel Drive System, Auxiliary Battery
HTR A/C	Climate Control System
LOCK (Relay)	Power Door Lock Relay (Lock Function)
HVAC1	Climate Control System
LDOOR	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
LTTRN	Left Turn Signals and Sidemarkers
VEH STOP	Vehicle Stoplamps, Brake Module, Electronic Throttle Control Module
RT TRLR ST/TRN	Right Turn Signal/Stop Trailer
RTTRN	Right Turn Signals and Sidemarfcers
BODY	Harness Connector
DDM	Driver Door Module
AUX PWR 2	Not Used
LOCKS	Power Door Lock System
ECC	Not Used
TBC 2C	Truck Body Controller
FLASH	Flasher Module
CB LT DOORS	Left Power Windows Circuit Breaker
TBC 2B	Truck Body Controller
TBC 2A	Truck Body Controller

Center Instrument Panel

Fuses and Relays

Assignment of the fuses and relays in the Center Instrument Panel Fuse Block (2003-2006)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
SEO	Special Equipment Option
TRAILER	Trailer Brake Wiring
UPFIT	Uptitter (Not Used)
SL RIDE	Ride Control Harness Connection
HDLR 2	Headliner Wiring Connector
BODY	Body Wiring Connector
DEFOG	Rear Defogger Relay
HDLNR 1	Headliner Wiring Connector 1
SPARE RELAY	Not Used
CB SEAT	Driver and Passenger Seat Module Circuit Breaker
CB RT DOOR	Right Power Windows Circuit Breaker
SPARE	Not Used
INFO	Infotainment Harness Connection

2005, 2006

Engine compartment (2005)

Under-hood fuse box diagram: GMC Sierra (2005)

Fuses and Relays

Assignment of the fuses and relays in the Engine compartment (2005)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
GLOW PLUG	Diesel Glow Plugs and Intake Air Heater
CUST FEED	Gasoline Accessory Power
STUD #1	Auxiliary Power {Single Battery and Diesels Only)/ Dual Battery (TP2) Do not install fuse.
MBEC	Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors
BLOWER	Front Climate Control Fan
LBEC	Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet-Rear Cargo Area and Instrument Panel
STUD 2	Accessory Power/Trailer Wiring Brake Feed
ABS	Anti-Lock Brakes
VSES/ECAS	Vehicle Stability
IGN A	Ignition Power
IGN B	Ignition Power
LBEC 1	Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module
TRL PARK	Parking Lamps Trailer Wiring
RR PARK	Right Rear Parking and Sidemarker Lamps
LR PARK	Left Rear Parking and Sidemarker Lamps
PARK LP	Parking Lamps Relay
STARTER	Starter Relay
INTPARK	Interior Lamps
STOP LP	Stoplamps
TBC BATT	Truck Body Controller Battery Feed
S/ROOF	Sunroof
SEO B2	Off-Road Lamps
4WS	Vent Solenoid Canister/Quadrasteer Module Power
RR HVAC	Not Used
AUX PWR	Auxiliary Power Outlet — Console
IGN 1	Ignition Relay
PCM 1	Powertrain Control Module
ETC/ECM	Electronic Throttle Control, Electronic Brake Controller
IGN E	Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay
RTD	Ride Control
TRLB/U	Backup Lamps Trailer Wiring
PCM B	Powertrain Control Module, Fuel Pump
F/PMP	Fuel Pump (Relay)
B/U LP	Back-up Lamps, Automatic Transmission Shift Lock Control System
RR DEFOG	Rear Window Defogger
HDLP-HI	Headlamp High Beam Relay
PRIME	Not Used
O2B	Oxygen Sensors
AIRBAG	Supplemental Inflatable Restraint System
FRTPARK	Front Parldng Lamps, Sidemarker Lamps
DRL	Daytime Running Lamps (Relay)
SEO IGN	Rear Defog Relay
TBC IGN1	Truck Body Controler Ignition
HI HDLP-LT	High Beam Headlamp-Left
LH HID	Not Used
DRL	Daytime Running Lamps
RVC	Regulated Voltage Control
IPC/DIC	Instrument Panel Cluster/Driver Information Center
HVAC/ECAS	Climate Control Controller
CIGLTR	Cigarette Lighter
HI HDLP-RT	High Beam Headlamp-Right
HDLP-LOW	Headlamp Low Beam Relay
A/C COMP	Air Conditioning Compressor
A/C COMP	Air Conditioning Compressor Relay
RRWPR	Not Used
RADIO	Audio System
SEO B1	Mid Bussed Electrical Center, Rear Heated Seats, HomeLink
LO HDLP-LT	Headlamp Low Beam-Left
BTSI	Brake Transmission Shift Interlock System
CRANK	Starting System
LO HDLP- RT	Headlamp Low Beam-Right
FOG LP	Fog Lamp Relay
FOG LP	Fog Lamps
HORN	Horn Relay
W/S WASH	Windshield Washer Pump Relay
W/S WASH	Windshield Washer Pump
INFO	OnStar/Rear Seat Entertainment
RADIO AMP	Radio Amplifier
RH HID	Not Used
HORN	Horn
EAP	Not Used
TREC	All-Wheel Drive Module
SBA	Supplemental Brake Assist
GAS:
*1	INJ 2
*2	INJ 1
*3	O2A
*4	O2B
*5	ING 1
DIESEL:
*1	EDU
*2	ECMRPV
*3	FUEL HT
*4	ECM
*5	EDU
EXCEPT H2:
*6	RRHVAC
*7	S/ROOF
H2:
*6	S/ROOF
*7

Engine compartment (2006)

Under-hood fuse box diagram: GMC Sierra (2006)

Fuses and Relays

Assignment of the fuses in the engine compartment (2006)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
GLOW PLUG	Diesel Glow Plugs and Intake Air Heater
CUST FEED	Gasoline Accessory Power
STUD #1	Auxiliary Power {Single Battery and Diesels Only)/ Dual Battery (TP2) Do not install fuse.
MBEC	Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors
BLOWER	Front Climate Control Fan
LBEC	Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet-Rear Cargo Area and Instrument Panel
STUD 2	Accessory Power/Trailer Wiring Brake Feed
ABS	Anti-Lock Brakes
VSES/ECAS	Vehicle Stability
IGN A	Ignition Power
IGN B	Ignition Power
LBEC 1	Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module
TRL PARK	Parking Lamps Trailer Wiring
RR PARK	Right Rear Parking and Sidemarker Lamps
LR PARK	Left Rear Parking and Sidemarker Lamps
PARK LP	Parking Lamps Relay
STARTER	Starter Relay
INTPARK	Interior Lamps
STOP LP	Stoplamps
TBC BATT	Truck Body Controller Battery Feed
S/ROOF	Sunroof
SEO B2	Off-Road Lamps
4WS	Vent Solenoid Canister/Quadrasteer Module Power
RR HVAC	Not Used
AUX PWR	Auxiliary Power Outlet — Console
IGN 1	Ignition Relay
PCM 1	Powertrain Control Module
ETC/ECM	Electronic Throttle Control, Electronic Brake Controller
IGNE	Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay
RTD	Ride Control
TRL B/U	Backup Lamps Trailer Wiring
PCM B	Powertrain Control Module, Fuel Pump
F/PMP	Fuel Pump (Relay)
B/U LP	Back-up Lamps, Automatic Transmission Shift Lock Control System
RR DEFOG	Rear Window Defogger
HDLP-HI	Headlamp High Beam Relay
PRIME	Not Used
O2B	Oxygen Sensors
AIRBAG	Supplemental Inflatable Restraint System
FRT PARK	Front Parking Lamps, Sidemarker Lamps
DRL	Daytime Running Lamps (Relay)
SEO IGN	Rear Defog Relay
TBC IGN1	Truck Body Controller Ignition
HI HDLP-LT	High Beam Headlamp-Left
LH HID	Not Used
DRL	Daytime Running Lamps
RVC	Regulated Voltage Control
IPC/DIC	Instrument Panel Cluster/Driver Information Center
HVAC/ECAS	Climate Control Controller
CIGLTR	Cigarette Lighter
HI HDLP-RT	High Beam Headlamp-Right
HDLP-LOW	Headlamp Low Beam Relay
A/C COMP	Air Conditioning Compressor
A/C COMP	Air Conditioning Compressor Relay
RRWPR	Not Used
RADIO	Audio System
SEO B1	Mid Bussed Electrical Center, Rear Heated Seats, HomeLink
LO HDLP-LT	Headlamp Low Beam-Left
BTSI	Brake Transmission Shift Interlock System
CRANK	Starting System
LO HDLP-RT	Headlamp Low Beam-Right
FOG LP	Fog Lamp Relay
FOG LP	Fog Lamps
HORN	Horn Relay
W/S WASH	Windshield Washer Pump Relay
W/S WASH	Windshield Washer Pump
INFO	OnStar/Rear Seat Entertainment
RADIO AMP	Radio Amplifier
RH HID	Not Used
HORN	Horn
EAP	Not Used
TREC	All-Wheel Drive Module
SBA	Supplemental Brake Assist
GAS:
*1	INJ 2 (Fuel Injection Rail #2)
*2	INJ 1 (Fuel Injection Rail #1)
*3	02A (Oxygen Sensors)
*4	02B (Oxygen Sensors)
*5	ING1 (Ignition 1)
*6	PCM B (Powertrain Control Module B)
DIESEL:
*1	EDU (Engine Control Module)
*2	ACTUATOR (Actuator)
*3	FUEL HTR (Fuel Heater)
*4	ECM 1 (Engine Control Module 1)
*5	ECM (Engine Control Module)
*6	ECM B (Engine Control Module B)
EXCEPT H2:
*7	RR HVAC (Rear Climate Control)
*8	S/ROOF (Sunroof)
H2:
*7	S/ROOF (Sunroof)
*8

Auxiliary Fuse Box

Engine compartment, auxiliary box: GMC Sierra (2005, 2006)

Fuses

Assignment of the fuses in the Engine compartment auxiliary box

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
COOL/FAN	Cooling Fan
COOL/FAN	Cooling Fan Relay Fuse
COOL/FAN	Cooling Fan Fuse

Relays

Assignment of the relays in the Engine compartment auxiliary box

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
COOL/FAN 1	Cooling Fan Relay 1
COOL/FAN 3	Cooling Fan Relay 3
COOL/FAN 2	Cooling Fan Relay 2

Instrument Panel

Fuses and Relays

Assignment of the fuses and relays in the Instrument Panel Fuse Block (2005, 2006)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
RRWPR	Not Used
SEO ACCY	Special Equipment Option Accessory
WSWPR	Windshield Wipers
TBC ACCY	Truck Body Controller Accessory
IGN 3	Ignition, Heated Seats
4WD	Four-Wheel Drive System, Auxiliary Battery
HTR A/C	Climate Control System
LOCK (Relay)	Power Door Lock Relay (Lock Function)
HVAC1	Climate Control System
LDOOR	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)
IGNO	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
RT TRN	Right Turn Signals and Sidemarkers
BODY	Harness Connector
DDM	Driver Door Module
AUX PWR 2	Not Used
LOCKS	Power Door Lock System
ECC	Not Used
TBC 2C	Truck Body Controller
FLASH	Flasher Module
CB LT DOORS	Left Power Windows Circuit Breaker
TBC 2B	Truck Body Controller
TBC 2A	Truck Body Controller

Center Instrument Panel

Fuses and Relays

Assignment of the fuses and relays in the Center Instrument Panel Fuse Block (2003-2006)

Fuse Data

Full access is available to registered users — log in or register.

Short-Code	Description
SEO	Special Equipment Option
TRAILER	Trailer Brake Wiring
UPFIT	Uptitter (Not Used)
SL RIDE	Ride Control Harness Connection
HDLR 2	Headliner Wiring Connector
BODY	Body Wiring Connector
DEFOG	Rear Defogger Relay
HDLNR 1	Headliner Wiring Connector 1
SPARE RELAY	Not Used
CB SEAT	Driver and Passenger Seat Module Circuit Breaker
CB RT DOOR	Right Power Windows Circuit Breaker
SPARE	Not Used
INFO	Infotainment Harness Connection

FAQ

Where are the cigar lighter / power outlet fuses in the GMC Sierra?

They are located in the engine compartment fuse box. Look for the fuses labeled “AUX PWR” (auxiliary console power outlet) and “CIGAR” (cigarette lighter).