The wiring circuits in your vehicle are protected from short circuits by a combination of fuses, circuit breakers and fusible thermal links. This greatly reduces the chance of fires caused by electrical problems.
Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure you replace a bad fuse with a new one of the identical size and rating.
If you ever have a problem on the road and don't have a spare fuse, you can borrow one that has the same amperage. Just pick some feature of your vehicle that you can get along without - like the radio or cigarette lighter - and use its fuse, if it is the correct amperage. Replace it as soon as you can.
Instrument Panel Fuse Block
The fuse block access door is on the driver's side edge of the instrument panel. Pull off the cover to access the fuse block.
To remove fuses, hold the end of the fuse between your thumb and index finger and pull straight out.
You may have spare fuses located behind the fuse block access door. These can be used to replace a bad fuse. However, make sure it is of the correct amperage.
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 |
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 |
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.
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 |
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 |
Underhood Fuse Block
The underhood fuse block in the engine compartment on the driver's side of the vehicle near the battery. Lift the cover for access to the fuse/relay block.
To remove fuses hold the end of the fuse between your thumb and index finger and pull straight out.
See Engine Compartment Overview for more information on its location.
*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 |
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 |
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 |
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 |
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 |
HORN | Horn |
EAP | Not Used |
TREC | All-Wheel Drive Module |
SBA | Supplemental Brake Assist |
