Year of production: 2003, 2004
Instrument Panel Fuse Block
The fuse block access door is on the driver’s side edge of the instrument panel.
Name | Usage |
RR Wiper | Rear Window Wiper Switch |
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 |
HTR A/C | Climate Control System |
LOCK | Power Door Lock Relay (Lock Function) |
HVAC 1 | Inside Rearview Mirror, Climate Control System |
L DOOR | Driver’s Door Harness Connection |
CRUISE | Cruise Control |
UNLOCK | Power Door Lock Relay (Unlock Function) |
RR FOG LP | Rear Fog Lamp (Export Only) |
BRAKE | Anti-Lock Brake System |
DRIVER UNLOCK | Power Door Lock Relay (Driver’s Door Unlock Function) |
IGN 0 | PCM, 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 |
Body | Harness Connector |
RT TRLR ST/TRN | Right Turn Signal/Stop Trailer |
RT TRN | Right Turn Signals and Sidemarkers |
DDM | Driver Door Module |
AUX PWR 2 | Rear Cargo Area Power Outlets |
LOCKS | Power Door Lock System |
ECC | Rear Electronic Climate Control, Liftgate |
TBC 2C | Truck Body Controller |
FLASH | Flasher Module |
CB LT DOORS | Left Power Window Circuit Breaker |
TBC 2B | Truck Body Controller |
TBC 2A | Truck Body Controller |
Center instrument panel utility block
The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.
Relay name | 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 |
SPARE RELAY | Not Used |
CB SEAT | Driver and Passenger Seat Module Circuit Breaker |
CB RT DOOR | Right Power Window Circuit Breaker |
SPARE | Not Used |
INFO | Infotainment Harness Connection |
Underhood fuse block
The underhood fuse block is located near the battery on the driver’s side of the vehicle.
*1 — Gasoline Engine and Fuel Injection Rail #2.
*2 — Gasoline Engine and Fuel Injection Rail #1.
*3 — Gasoline Engine; Oxygen Sensors.
*4 — Gasoline Engine; Oxygen Sensors.
*5 — PCM Ignition
Fuse | Usage |
GLOW PLUG | Not Used |
CUST FEED | Accessory Power |
STUD #1 | Auxiliary Power |
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 | Rear Climate Control |
AUX PWR | Auxiliary Power Outlet — Console |
IGN 1 | Ignition Relay |
PCM 1 | Powertrain Control Module |
ETC/ECM | Electronic Throttle Control, Electronic Brake Controlle |
INJ 1 | Ignition Coil, Fuel Injectors–Bank 1 |
INJ 2 | Ignition Coil, Fuel Injectors–Bank 2 |
IGN E | 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) |
O2A | Oxygen Sensors |
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 | Left Hand High Intensity Discharge Lamps |
DRL | Daytime Running Lamps |
IPC/DIC | Instrument Panel Cluster/Driver Information Center |
HVAC/ECAS | Climate Control Controlle |
CIG LTR | Cigarette Lighter |
HI HDLP-RT | High Beam Headlamp-Right |
HDLP-LOW | Headlamp Low Beam Relay |
A/C COMP | Air Conditioning Compressor Relay |
A/C COMP | Air Conditioning Compressor |
RR WPR | Rear Wiper/Washe |
RADIO | Audio System |
SEO B1 | Mid Bussed Electrical Center, HomeLink, Rear Heated Seats |
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 and Rear Window Washer Pump Relay |
W/S WASH | Windshield and Rear Window Washer Pump |
INFO | OnStar/Rear Seat Entertainment |
RADIO AMP | Radio Amplifier |
RH HID | Right Hand High Intensity Discharge Lamp |
HORN | Horn Fuse |
EAP | Electric Adjustable Pedals |
TREC | All-Wheel Drive Module |
SBA | Supplemental Brake Assist |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.