GMC C-Series mk2 (Second Generation; 1999) – fuse box diagram
Year of production: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999
Instrument Panel Circuit Breaker Block
This fuse block is in the lower portion of the instrument panel, to the left of the steering column.
| Name | Circuits protected |
| HYD BRK | Brake Pump Motor Relay |
| HYD BRK | Brake Alarm Module |
| B/U IGN3 | Fuel Filter Relay, Blower Motor Relays, ABS Power Relay, Back-Up Lamps, Auxiliary Wiring Relay, IGN 3 Relay, Power Window Relay, Vehicle Interface Module, Transmission Temperature Gage |
| STOP | Stoplamps |
| WASH/WIPE | Windshield Wipers/Washer, Accessory Relay |
| DOME/PNL | Dome Lamp, Radio Receiver, Instrument Panel Lights, A/C Controller, Headlamp/Seatbelt Module |
| BLOWER | Blower Motor |
| A/C | A/C Clutch Compressor, A/C Controller |
| TRN/HAZ | Turn Signals, Hazard Flashers |
| CHAS | Exhaust Brake, Air Suspension Dump Valve, Air Dryer, HYD ABS ECHU |
| PARK LP | Auxiliary Wiring, Air Conditioner Controls, Parking Lamps, Turn Signals, Taillamps, Stoplamps, Marker Lamps, Trailer Running Lamps, Lighted Mirrors, Radio Receiver, Mirror Clearance Lamps |
| HORN | Horn/Diagnostic Connector |
| PRK BRK | Parking Brake Module |
| FUEL | Heated Fuel Filter (Diesel Engines) or Fuel Pump (Gasoline Engines) |
| AXLE | Heated Mirrors, Radiator Shutters, Two-Speed Axle Motor, Two-Speed Axle Switch |
| MRKR LP | Roof Marker Lamps, Trailer Marker Lamps, Marker Lamp Relay |
| CIG/AUX | Cigarette Lighter, Auxiliary Power Jacks |
| AUX | Auxiliary Wiring Relay |
| IGN RLY/VIN | Vehicle Interface Module (Diesel Engines) or Generator, Coil, Injectors (Gasoline Engines) |
| WDO | Power Windows |
| CRNK | Starter Relay |
| IGN SW | Instrument Panel Cluster Telltales |
| AUX | Auxiliary Wiring |
| RDO | Radio, Auxiliary Wiring |
| DR LK | Power Door Locks |
Maxi-Fuse Block
| Name | Circuits/Circuit Breakers Protected |
| STP/HAZ TURN | Stop Lamp, Turn Signal/Hazard Lights, Fuel, Ignition Relay (Gasoline Engines) |
| IGN SW3 | Air Conditioner, Ignition Switch, Axle, Chassis |
| INT/EXT LIGHTS | Parking Lamps, Dome/Panel Lights |
| HEAD LAMP | Headlamps, Daytime Running Lamps |
| AUX WRG | Auxiliary, Park Brake |
| IGN SW1 | Ignition Switch, Wash/Wipe, Crank, Radio |
| HYD PUMP | Hydraulic Brake, Brake Pump Motor |
| HYD ABS | EHCU |
| PWR WDO/LCKS | Window, Door Locks |
| PARK BRK | Parking Brake Motor |
| BLOWER HORN | Blower, Horn, Cigarette Lighter/Auxiliary |
| FUEL/ENGINE | Empty |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.