Chevrolet Silverado GMT800 mk1 (First Generation) 1999 – 2007 – fuse box diagram
Year of production: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Instrument Panel Fuse Block
The fuse block access door is on the driver’s side edge of the instrument panel.
| Name | Usage |
| L BODY | Retained Accessory Power Relay |
| LOCK | Power Door Locks |
| DRV UNLOCK | Power Door Lock Relay |
| LOCK | Power Door Lock Relay |
| HVAC 1 | Climate Control System |
| CRUISE | Cruise Control, Instrument Cluster |
| IGN 3 | Ignition, Power Seats |
| 4WD | Four-Wheel Drive System, Auxiliary Battery |
| CRANK | Starting System |
| INT PRK | Parking Lamps, Sidemarker Lamps, Interior Lamps |
| L DOOR | 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 |
| WS WPR | Windshield Wipers |
| IGN 1 | Ignition, Instrument Panel |
| AIR BAG | 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, VCM/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 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 |
| 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 | Upfitter |
| PARK LAMP | Parking Lamps |
| FRT PRK EXPT | Not Used |
| SL RIDE | Manual Selectable Ride Switch |
| SPARE 2 | Not Used |
| RR PRK LP | Not Used |
| RR FOG LP | Not Used |
| SPARE 3 | Not Used |
| INAV PWR | Interior Lights Feed |
| CTSY LP | Courtesy Lamps |
| CEL PHONE | Cellular Telephone Wiring |
Underhood Electrical Center
The underhood electrical center is located on the driver’s side of the engine compartment near the battery.
| Name | Usage |
| 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) |
| IGN B | Ignition Switch |
| RAP #2 | Not Used |
| STUD #2 | Accessory Power/Trailer Wiring Brake Feed |
| TRL R TRN | Right Turn Signal Trailer Wiring |
| TRL L TRN | Left Turn Signal Trailer Wiring |
| IGN 1 | Ignition, Fuel Controls |
| INJ B | Ignition, Fuel Controls (Relay) |
| STARTER | Starter (Relay) |
| PARK LP | Parking Lamps |
| FRT HVAC | Climate Control System |
| STOP LP | Exterior Lamps, Stoplamps |
| ECM 1 | VCM/PCM |
| 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 |
| IGN E | 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 |
| ECM B | VCM/PCM |
| F/PMP | Fuel Pump (Relay) |
| O2 A | Oxygen Sensors |
| O2 B | Oxygen Sensors |
| LR PRK | Left Rear Parking Lamps |
| RR DEFOG | Rear Window Defogger, Heated Mirrors |
| 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 |
| 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/W PMP | Windshield Washer Pump |
| HORN | Horn (Relay) |
| IGN C | Ignition Switch, Fuel Pump, PRND321 Display, Crank |
| RDO AMP | Not Used |
| HAZ LP | Exterior Lamps, Hazard Lamps |
| EXP LPS | Not Used |
| HORN | HORN |
| CTSY LP | Interior Lamps |
| RR WPR | Not Used |
| TBC | Body Control Module, Remote Keyless Entry, Headlamps |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.