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 instrument panel fuse block access door is located on the driverâs side edge of the instrument panel.
Fuses | Usage |
REAR SEAT | Rear Seats |
AUX PWR2 | Rear Accessory Power Outlet |
SWC BKLT | Steering Wheel Controls Backlight |
DDM | Driver Door Module |
CTSY | Dome Lamps, Driverâs Side Turn Signal |
LT STOP TRN | Driver Side Turn Signal, Stoplamp |
DIM | Instrument Panel Back Lighting |
RT STOP TRN | Passenger Side Turn Signal, Stoplamp |
PDM | Passenger Door Module, Universal Home Remote System |
UNLCK2 | Power Door Lock 2 (Unlock Feature) |
LCK2 | Power Door Lock 2 (Lock Feature) |
STOP LAMPS | Stoplamps, Center-High Mounted Stoplamp |
REAR HVAC | Rear Climate Controls |
PWR MIR | Power Mirror |
BCM | Body Control Module (BCM) |
AUX PWR | Accessory Power Outlets |
IS LAMPS | Interior Lamps |
UNLCK1 | Power Door Lock 1 (Unlock Feature) |
OBS DET | Ultrasonic Rear Parking Assist |
LCK1 | Power Door Lock 1 (Lock Feature) |
REAR WPR | Not Used |
COOLEDÂ SEATS | Not Used |
DSM | Driver Seat Module, Remote Keyless Entry System |
DRV UNLCK | Driverâs Power Door Lock (Unlock Feature) |
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Circuit Breaker | Usage |
LT DR | Driverâs Side Power Window Circuit Breaker |
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Harness Connector | Usage |
LT DR | Driverâs Door Harness Connection |
BODY | Harness Connector |
BODY | Harness Connector |
Center Instrument Panel Fuse Block
The center instrument panel fuse block is located underneath the instrument panel, to the left of the steering column.
Harness Connector | Usage |
BODY 2 | Body Harness Connector 2 |
BODY 1 | Body Harness Connector 1 |
BODY 3 | Body Harness Connector 3 |
HEADLINER 3 | Headliner Harness Connector 3 |
HEADLINER 2 | Headliner Harness Connector 2 |
HEADLINER 1 | Headliner Harness Connector 1 |
BRAKEÂ CLUTCH | Brake Clutch Harness Connector |
SEO/UPFITTER | Special Equipment Option Upfitter Harness Connector |
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Circuit Breaker | Usage |
CB1 | Passengerâs Side Power Window Circuit Breaker |
CB2 | Passengerâs Seat Circuit Breaker |
CB3 | Driverâs Seat Circuit Breaker |
CB4 | Not Used |
Underhood Fuse Block
The underhood fuse block is located in the engine compartment, on the driverâs side of the vehicle.
Fuses | Usage |
1 | Right Trailer Stop/Turn Lamp |
2 | Not Used |
3 | Electronic Stability Suspension Control, Automatic Level Control Exhaust |
4 | Left Trailer Stop/Turn Lamp |
5 | Engine Controls |
6 | Engine Control Module, Throttle Control |
7 | Trailer Brake Controller |
8 | Front Washer |
9 | Oxygen Sensors |
10 | Anti-lock Brakes System 2 |
11 | Trailer Back-up Lamps |
12 | Driverâs Side Low-Beam Headlamp |
13 | Engine Control Module (Battery) |
14 | Fuel Injectors, Ignition Coils (Right Side) |
15 | Transmission Control Module (Battery) |
16 | Vehicle Back-up Lamps |
17 | Passengerâs Side Low-Beam Headlamp |
18 | Air Conditioning Compressor |
19 | Oxygen Sensors |
20 | Transmission Controls (Ignition) |
21 | Fuel Pump |
22 | Fuel System Control Module |
23 | Not Used |
24 | Not Used |
25 | Fuel Injectors, Ignition Coils (Left Side) |
26 | Trailer Park Lamps |
27 | Driverâs Side Park Lamps |
28 | Passengerâs Side Park Lamps |
29 | Fog Lamps |
30 | Horn |
31 | Passengerâs Side High-Beam Headlamp |
32 | Daytime Running Lamps |
33 | Driverâs Side High-Beam Headlamp |
34 | Not Used |
35 | Sunroof |
36 | Key Ignition System, Theft Deterrent System |
37 | Windshield Wiper |
38 | SEO B2 Upfitter Usage (Battery) |
39 | Electric Adjustable Pedals |
40 | Climate Controls (Battery) |
41 | Airbag System (Ignition) |
42 | Amplifier |
43 | Audio System |
44 | Miscellaneous (Ignition), Cruise Control |
45 | Tailgate Open/Close Assist |
46 | Airbag System (Battery) |
47 | OnStarŽ, Rear Seat Entertainment Display |
48 | Instrument Panel Cluster |
49 | Power Take-Off |
50 | Auxiliary Climate Control (Ignition), Compass-Temperature Mirror |
51 | Center High-Mounted Stoplamp (CHMSL) |
52 | Rear Defogger |
53 | Heated Mirrors |
54 | SEO B1 Upfitter Usage (Battery) |
55 | Cigarette Lighter, Auxiliary Power Outlet |
56 | Automatic Level Control Compressor Relay, SEO Upfitter Usage |
57 | Climate Controls (Ignition) |
58 | Engine Control Module, Secondary Fuel Pump (Ignition) |
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J-Case | Usage |
59 | Cooling Fan 1 |
60 | Automatic Level Control Compressor |
61 | Heavy Duty Anti-lock Brake System |
62 | Cooling Fan 2 |
63 | Anti-lock Brake System 1 |
64 | Starter |
65 | Stud 2 (Trailer Brakes) |
66 | Left Bussed Electrical Center 1 |
67 | Not Used |
68 | Heated Windshield Washer System |
69 | Four-Wheel Drive System |
70 | Stud 1 (Trailer Connector Battery Power) (Optional â 40A Fuse Required) |
71 | Mid-Bussed Electrical Center 1 |
72 | Climate Control Blower |
73 | Tailgate Open/Close Assist |
74 | Left Bussed Electrical Center 2 |
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Relays | Usage |
FAN HI | Cooling Fan High Speed |
FAN LO | Cooling Fan Low Speed |
ENG EXH VLV | Not Used |
FAN CNTRL | Cooling Fan Control |
HDLP LO/HID | Low-Beam Headlamp |
FOG LAMP | Front Fog Lamps |
A/C CMPRSR | Air Conditioning Compressor |
STRTR | Starter |
PWR/TRN | Powertrain |
FUEL PMP | Fuel Pump |
PRK LAMP | Parking Lamps |
REAR DEFOG | Rear Defogger |
RUN/CRANK | Switched Power |
WARNING:Â Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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