GMC Sierra mk1 (2005) – fuse box diagram

GMC Sierra mk1 (2005) – fuse box diagram

Year of production: 2005

Instrument Panel Fuse Block

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

GMC Sierra mk1 – fuse box – instrument panel
GMC Sierra mk1 – fuse box – instrument panel
Fuses Usage
RR WPR 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
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)
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 Fuse Block

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

GMC Sierra mk1 – fuse box – center instrument panel
GMC Sierra mk1 – fuse box – center instrument panel
Device Usage
SEO Special Equipment Option
TRAILER Trailer Brake Wiring
UPFIT Upfitter (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
CB SEAT Driver and Passenger Seat Module Circuit Breaker
CB RT DOOR Right Power Windows Circuit Breaker
SPARE Not Used
INFO Infotainment Harness Connection

Underhood Fuse Block

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

GMC Sierra mk1 – fuse box – engine compartment
GMC Sierra mk1 – fuse box – engine compartment
1 INJ 2 15A
2 INJ 1 15A
3 02A 15A
4 02B 15A
5 ING 1
1 EDU 25A
4 ECM 15A
7 S/ROOF 25A
6 S/ROOF 30A


*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

Fuses Usage
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
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
02B 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
CIG LTR 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
RR WPR 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
EAP Not Used
TREC All-Wheel Drive Module
SBA Supplemental Brake Assist

Auxiliary Electric Cooling Fan Fuse Block

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.

GMC Sierra mk1 – fuse box – auxiliary box
GMC Sierra mk1 – fuse box – auxiliary box
Fuses Usage
COOL/FAN Cooling Fan
COOL/FAN Cooling Fan Relay Fuse
COOL/FAN Cooling Fan Fuse


Relays Usage
COOL/FAN 1 Cooling Fan Relay 1
COOL/FAN 3 Cooling Fan Relay 3
COOL/FAN 2 Cooling Fan Relay 2

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.