Jonathan Yarden Mar 25, 2021 · 5 min. read
In this article you will find a description of fuses and relays HUMMER,
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 driver side edge of the instrument panel.
| Fuses | Usage |
| AUX PWR | Rear Cargo Accessory Power Outlets |
| AUX PWR 2 | Floor Console Power Outlets |
| BCM | Body Control Module |
| CTSY | Dome Lamps, Front Passenger Side Turn Signal |
| DDM | Driver Door Module |
| DIM | Instrument Panel Back Lighting |
| DSM | Drive Seat Module |
| INFO | Infotainment System, Remote Keyless Entry System |
| IS LPS | Interior Lamps |
| LCK 1 | Power Door Lock 1 (Lock Feature) |
| LCK2 | Power Door Lock 2 (Lock Feature) |
| LT DR | Driver Side Power Window Circuit Breaker |
| LT STOP TRN | Driver Side Turn Signal, Stoplamp |
| ONSTAR | OnStar® |
| PDM | Passenger Door Module |
| REAR HVAC | Rear Climate Controls |
| REAR SEAT | Rear Seat |
| REAR WPR | Rear Wiper |
| RT STOP TRN | Passenger Side Turn Signal, Stoplamp |
| STOP LAMPS | Stoplamps, Center High‐Mounted Stoplamp |
| SWC BKLT | Steering Wheel Controls Backlight |
| UGDO | Universal Home Remote System |
| UNLCK1 | Power Door Lock 1 (Unlock Feature) |
| UNLCK2 | Power Door Lock 2 (Unlock Feature) |
| Harness Connector | Usage |
| LT DR | Driver 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.
Top View
| 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 |
| SEO/UPFITTER | Special Equipment Option Upfitter Harness Connector |
| Circuit Breaker | Usage |
| CB1 | Passenger Side Power Window Circuit Breaker |
| CB2 | Passenger Seat Circuit Breaker |
| CB3 | Driver Seat Circuit Breake |
| CB4 | Rear Sliding Window |
Underhood Fuse Block
The underhood fuse block in the engine compartment is located on the driver side of the vehicle near the battery.
| Fuses | Usage |
| 1 | Left Trailer Stop/Turn Lam |
| 2 | Engine Controls |
| 3 | Engine Control Module, Throttle Control |
| 4 | Right Trailer Stop/Turn Lamp |
| 5 | Front Washer |
| 6 | Oxygen Sensors |
| 7 | Vehicle Stability System, Antilock Brake System-2 |
| 8 | Trailer Back-up Lamps |
| 9 | Left Low-Beam Headlamp |
| 10 | Engine Control Module (Battery) |
| 11 | Fuel Injectors, Ignition Coils (Right Side) |
| 12 | Transmission Control Module (Battery) |
| 13 | Vehicle Back-up Lamps |
| 14 | Right Low-Beam Headlamp |
| 15 | Air Conditioning Compressor |
| 16 | Oxygen Sensors |
| 17 | Transmission Controls (Ignition) |
| 18 | Fuel Pump |
| 19 | Rear Washer |
| 20 | Fuel Injectors, Ignition Coils (Left Side) |
| 21 | Trailer Park Lamps |
| 22 | Left Park Lamps |
| 23 | Right Park Lamps |
| 24 | Horn |
| 25 | Right Side High-Beam Headlamp |
| 26 | Daytime Running Lamps (DRL) |
| 27 | Left High-Beam Headlamp |
| 28 | Sunroof |
| 29 | Key Ignition System, Theft Deterrent System |
| 30 | Windshield Wiper |
| 31 | SEO B2 Upfitter Usage (Battery) |
| 32 | Electrically Controlled Air Suspension |
| 33 | Climate Controls (Battery) |
| 34 | Airbag System (Ignition) |
| 35 | Amplifier |
| 36 | Audio System |
| 37 | Miscellaneous (Ignition), Cruise Control, Rear Vision Camera |
| 38 | Airbag System (Battery) |
| 39 | Instrument Panel Cluster |
| 40 | Run, Accessory |
| 41 | Auxiliary Climate Control (Ignition) |
| 42 | Rear Defogger |
| 43 | SEO B1 Upfitter Usage (Battery) |
| 44 | Cigarette Lighter, Auxiliary Power Outlet |
| 45 | Special Equipment Option (SEO) |
| 46 | Climate Controls (Ignition) |
| 47 | Engine Control Module (Ignition) |
| 50 | Cooling Fan 1 (J-Case) |
| 51 | Electronically Controlled Air Suspension (J-Case) |
| 52 | Vehicle Stability System, Antilock Brake System-1 (J-Case) |
| 53 | Cooling Fan 2 (J-Case) |
| 54 | Starter (J-Case) |
| 55 | Stud 2 Trailer Brake Module (J-Case) |
| 56 | Left Bussed Electrical Center 1 (J-Case) |
| 57 | Heated Windshield Washer System (J-Case) |
| 58 | Four-Wheel Drive System (J-Case) |
| 59 | Stud 1 Trailer Connector Battery Power (J-Case) |
| 60 | Mid Bussed Electrical Center 1 (J-Case) |
| 61 | Climate Control Blower (J-Case) |
| 62 | Left Bussed Electrical Center 2 (J-Case) |
| Relays | Usage |
| A/C CMPRSR | Air Conditioning Compressor |
| FAN CNTRL | Cooling Fan Contro |
| FAN HI | Cooling Fan High Speed |
| FAN LO | Cooling Fan Low Speed |
| HDLP LO | Low-Beam Headlamp |
| PRK LAMP | Parking Lamps |
| PWR/TRN | Powertrain |
| REAR DEFOG | Rear Defogger |
| RUN/CRNK | Switched Power |
| STRTR | Starter |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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