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.
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.
Fuse/Circuit Breaker | Usage |
1 | Stop/TCC Switch, Buzzer, CHMSL, Hazard Lamps, Stoplamps |
2 | Transfer Case |
3 | Courtesy Lamps, Cargo Lamp, Glove Box Lamp, Dome/Reading Lamps, Vanity Mirrors, Power Mirrors |
4 | Instrument Cluster, DRL Relay, Lamp Switch, Keyless Entry, Low Coolant Module, Illuminated Entry Module, DRAC (Diesel Engine) |
5 | Not Used |
6 | Cruise Control |
7 | Auxiliary Power Outlet |
8 | Air Bag System |
9 | License Lamp, Parking Lamps, Taillamps, Roof Marker Lamps, Tailgate Lamps, Front Sidemarkers, Fog Lamp Relay, Door Switch Illumination, Fender Lamps, Headlamp Switch Illumination |
10 | Air Bag System |
11 | Wiper Motor, Washer Pump |
12 | A/C, A/C Blower, High Blower Relay |
13 | Power Amp, Cigarette Lighter, Door Lock Relay, Power Lumbar Seat |
14 | 4WD Indicator, Cluster, Comfort Controls, Instrument Switches, Radio Illumination, Chime Module |
15 | DRL Relay, Fog Lamp Relay |
16 | Front and Rear Turn Signals, Back-Up Lamps, BTSI Solenoid |
17 | Radio (Ignition) |
18 | 4WAL/VCM, ABS, Cruise Control |
19 | Radio (Battery) |
20 | PRNDL, Automatic Transmission, Speedometer, Check Gages Warning Light |
21 | Variable Effort Steering |
22 | Not Used |
23 | Not Used |
24 | Front Axle, 4WD Indicator Lamp, TP2 Relay (Gasoline Engine) |
A | Power Door Lock, Six-Way Power Seat, Keyless Entry Module |
B | Power Windows |
Underhood Fuse/Relay Center
The underhood fuse/relay center is located in the rear of the engine compartment near the brake fluid reservoir.
Name | Usage |
ECM-B | Fuel Pump, PCM/VCM |
RR DEFOG | Rear Window Defogger |
IGN-E | Auxiliary Fan Relay Coil, A/C Compressor Relay, Hot Fuel Module, Dual Tanks |
HORN | Horn, Underhood Lamps |
AUX FAN | Auxiliary Fan |
ECM-1 | Injectors, PCM/VCM, Fuel Solenoid (Diesel Engine, Fuel Control Module (Diesel Engine) |
HTD ST-FR | Not Used |
A/C | Air Conditioning |
HTD MIR | Not Used |
ENG-1 | Ignition Switch, EGR, Canister Purge, EVRV Idle Coast Solenoid, MAF, Heated O2, Fuel Heater (Diesel Engine), Water Sensor (Diesel Engine), Boost Solenoid (Diesel Engine), EPR (Diesel Engine) |
HTD ST-RR | Not Used |
LIGHTING | Headlamp and Panel Dimmer Switch, Fog and Courtesy Fuses |
BATT | Battery, Fuse Block Busbar |
IGN-A | Ignition Switch |
IGN-B | Ignition Switch |
ABS | Anti-Lock Brake Module |
BLOWER | High Blower Relay |
STOP/HAZ | Stoplamps |
HEATED SEATS | Not Used |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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