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GMC C-Series mk2 (Second Generation; 1990 - 1999) Fuse Box Diagram

avatar Jonathan Yarden Oct 06, 2021 · 5 min. read

In this article you will find a description of fuses and relays GMC, with photos of block diagrams and their locations. Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.

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.

GMC C-Series mk2 - fuse box - instrument panel

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

GMC C-Series mk2 - fuse box - 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
PWR WDO/LCKS Window, Door Locks
PARK BRK Parking Brake Motor
BLOWER HORN Blower, Horn, Cigarette Lighter/Auxiliary

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

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