Instrument Panel Fuse Block
The fuse block access door is located on the driver’s side edge of the instrument panel.
| Fuses | 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 | Rear Heated Seats Module |
| 4WD | Four-Wheel Drive Switch, Air Suspension Switch/Module |
| HTR A/C | Not Used |
| LOCK | Power Door Lock Relay |
| HVAC 1 | Inside Rearview Mirror, Climate Control System |
| L DOOR | Harness Connection |
| CRUISE | Cruise Control |
| UNLOCK | Power Door Lock Relay |
| RR FOG LP | Not Used |
| BRAKE | Brake Switch |
| IGN 0 | Brake Transmission Shift Interlock, Powertrain Control Module, Transmission |
| TBC IGN 0 | Truck Body Controller |
| VEH CHMSL | Vehicle and Trailer Center High Mounted Stop Lamp |
| 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 | Instrument Panel and Rear Cargo Area Power Outlets |
| LOCKS | Rear Doors and Liftgate Power Lock Relay Feed |
| ECC | Not used |
| TBC 2C | Truck Body Controller |
| FLASH | Flasher Module |
| CB LT DOORS | Left Rear Power Window Circuit Breaker and Driver Door Module |
| 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/Off-Road Lamps Harness Connector |
| TRAILER | Trailer Brake Wiring |
| UPFIT | Upfitter (Not Used) |
| SL RIDE | Ride Control (Not Used) |
| HDLR 2 | Headliner Wiring Connector 2 |
| 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 | Rear Right Power Window, Passenger Door Module |
| SPARE | Not Used |
| INFO | Infotainment Unit (Not Used) |
Underhood Fuse Block
The underhood fuse block in the engine compartment is located on the driver’s side of the vehicle near the battery.
| Fuses | Usage |
| STUD #1 | Accessory Power/Trailer Wiring |
| MBEC 1 | Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors |
| BLOWER | Front Climate Control Fan |
| LBEC 2 | 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 | (ECAS) Electronically Controlled Air Suspension |
| IGN A | Ignition Switch |
| IGN B | Ignition Switch |
| LBEC 1 | Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module |
| TRL PARK | Parking Lamps Trailer Wiring |
| RR PARK | Passenger’s Side Rear Parking and Sidemarker Lamps |
| LR PARK | Driver’s Side Rear Parking and Sidemarker Lamps |
| PARK LP | Parking Lamps Relay |
| STRTRER | Starter Relay |
| INTPARK | Roof Marker Lamps |
| STOP LP | Stoplamps |
| TBC BATT | Truck Body Controller Battery Feed |
| SEO B2 | Off-Road Lamps |
| 4WS | Vent Solenoid Canister |
| 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 |
| INJ 1 | Ignition Coil, Fuel Injectors-Bank 1 |
| INJ 2 | Ignition Coil, Fuel Injectors-Bank 2 |
| IGN E | Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay, Electronic Brake Controller TC2 Mode Switch |
| RTD | Electronic Brake Controller Battery Feed |
| TRL B/U | Backup Lamps Trailer Wiring |
| PCM B | Powertrain Control Module, Fuel Pump |
| F/PMP | Fuel Pump Relay |
| 02A | 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 | Not Used |
| DRL | Daytime Running Lamps |
| IPC/DIC | Instrument Panel Cluster/ Driver Information Center |
| HVAC/ECAS | Climate Control Controller/Electronically Controlled Air Suspension |
| 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 | Rear Wiper/Washer |
| 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 |
| CRNK | Starting System |
| LO HDLP-RT | Headlamp Low Beam-Right |
| FOG LP | Not Used (Relay) |
| FOG LP | Not Used |
| HORN | Horn Relay |
| W/S WASH | Windshield and Rear Window Washer Pump Relay |
| W/S WASH | Windshield and Rear Window Washer Pump |
| INFO | OnStar |
| RADIO AMP | Radio Amplifier |
| RH HID | Not Used |
| HORN | Horn |
| EAP | Not Used |
| TREC | All-Wheel Drive Module |
| SBA | Not Used |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.