Jonathan Yarden Mar 25, 2021 · 5 min. read
In this article you will find a description of fuses and relays Cadillac,
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: 2015, 2016, 2017
Engine compartment fuse block
The engine compartment fuse block is in the engine compartment, on the driver side of the vehicle.
| Item | Usage |
| 1 | Electric Running Boards |
| 2 | Antilock Brake System Pump |
| 3 | Interior BEC LT1 |
| 4 | MBS Passenger |
| 5 | Suspension Leveling Compressor |
| 6 | 4WD Transfer Case Electronic Control |
| 10 | Electric Parking Brake |
| 13 | Interior BEC LT2 |
| 14 | Rear BEC 1 |
| 17 | MBS Driver |
| 21 | ALC Exhaust Solenoid |
| 23 | Integrated Chassis Control Module |
| 24 | Real Time Dampening |
| 25 | Fuel Pump Power Module |
| 26 | Spare/Battery Regulated Voltage Control |
| 28 | Upfitter 2 |
| 29 | Upfitter 2 Relay |
| 30 | Wiper |
| 34 | Back-up Lamps |
| 35 | Antilock Brake System Valve |
| 36 | Trailer Brakes |
| 37 | Upfitter 3 Relay |
| 39 | Trailer Stop/Turn Right |
| 40 | Trailer Stop/ Turn Left |
| 41 | Trailer Park Lamps |
| 42 | Right Parking Lamps |
| 43 | Left Parking Lamps |
| 44 | Upfitter 3 |
| 45 | Automatic Level Control Run/Crank |
| 47 | Upfitter 4 |
| 48 | Upfitter 4 Relay |
| 49 | Reverse Lamps |
| 51 | Parking Lamp Relay |
| 60 | Air Conditioning Control |
| 63 | Upfitter 1 |
| 67 | Trailer Battery |
| 69 | RC Upfitter 3 and 4 |
| 70 | VBAT Upfitter 3 and 4 |
| 72 | Upfitter 1 Relay |
| 74 | Engine Control Module Ignition |
| 75 | Miscellaneous Ignition Spare |
| 76 | Transmission Ignition |
| 77 | RC Upfitter 1 and 2 |
| 78 | VBAT Upfitter 1 and 2 |
| 83 | Spare/Spare |
| 84 | Run/Crank Relay |
| 87 | Engine |
| 88 | Injector A – Odd |
| 89 | Injector B – Even |
| 90 | Oxygen Sensor B |
| 91 | Throttle Control |
| 92 | Engine Control Module Relay |
| 93 | Horn |
| 94 | Fog Lamps |
| 95 | High-Beam Headlamps |
| 100 | Oxygen Sensor A |
| 101 | Engine Control Module |
| 102 | Engine Control Module/Transmission Control Module |
| 103 | Auxiliary Interior Heater |
| 104 | Starter |
| 107 | Aero Shutter |
| 109 | Police Upfitter |
| 112 | Starter Relay |
| 114 | Front Windshield Washer |
| 115 | Rear Window Washer |
| 116 | Cooling Fan Left |
| 121 | Right HID Headlamp |
| 122 | Left HID Headlamp |
| 123 | Cooling Fan Right |
Instrument Panel Fuse Block (Left)
The left instrument panel fuse block access door is on the driver side edge of the instrument panel.
| Number | Usage |
| 1 | Not Used |
| 2 | Not Used |
| 3 | Not Used |
| 4 | Accessory Power Outlet 1 |
| 5 | Retained Accessory Power/Accessory |
| 6 | APO/BATT |
| 7 | Universal Garage Door Opener/Inside Rear View Mirror |
| 8 | SEO Retained Accessory Power |
| 9 | Not Used |
| 10 | Body Control Module 3 |
| 11 | Body Control Module 5 |
| 12 | Steering Wheel Controls Backlighting |
| 13 | Not Used |
| 14 | Not Used |
| 15 | Not Used |
| 16 | Discrete Logic Ignition Sensor |
| 17 | Not Used |
| 18 | Mirror Window Module |
| 19 | Body Control Module 1 |
| 20 | Front Bolster (if equipped) |
| 21 | Not Used |
| 22 | Not Used |
| 23 | Not Used |
| 24 | Heater, Ventilation and Air Conditioning Ignition/Heater, Ventilation and Air Conditioning Auxiliary |
| 25 | Instrument Cluster Ignition/Sensing Diagnostic Module Ignition |
| 26 | Tilt Column/SEO, Tilt Column Lock/SEO |
| 27 | Data Link Connector/Driver Seat Module |
| 28 | Passive Entry/Passive Start/Heater, Ventilation and Air Conditioning Battery |
| 29 | Content Theft |
| 30 | Not Used |
| 31 | Not Used |
| 32 | Not Used |
| 33 | SEO/Automatic Level Control |
| 34 | Park Enable Electric Adjustable Pedal (if equipped) |
| 35 | Not Used |
| 36 | Miscellaneous R/C |
| 37 | Heated Steering Wheel |
| 38 | Steering Column Lock 2 (if equipped) |
| 39 | Instrument Cluster Battery |
| 40 | Not Used |
| 41 | Not Used |
| 42 | Euro Trailer (if equipped) |
| 43 | Left Doors |
| 44 | Driver Power Seat |
| 45 | Not Used |
| 46 | Right Heated/Cooled Seat |
| 47 | Left Heated/Cooled Seat |
| 48 | Not Used |
| 49 | Not Used |
| 50 | Accessory Power Outlet 2 |
| 51 | Not Used |
| 52 | Retained Accessory Power/Accessory Relay |
| 53 | Run/Crank Relay |
| 54 | Not Used |
| 55 | Not Used |
| 56 | Not Used |
Instrument Panel Fuse Block (Right)
The right instrument panel fuse block access door is on the passenger side edge of the instrument panel.
| Number | Usage |
| 1 | Not Used |
| 2 | Not Used |
| 3 | Not Used |
| 4 | Accessory Power Outlet 4 |
| 5 | Not Used |
| 6 | Not Used |
| 7 | Not Used |
| 8 | Glove Box |
| 9 | Not Used |
| 10 | Not Used |
| 11 | Not Used |
| 12 | Steering Wheel Controls |
| 13 | Body Control Module 8 |
| 14 | Not Used |
| 15 | Not Used |
| 16 | Not Used |
| 17 | Not Used |
| 18 | Not Used |
| 19 | Body Control Module 4 |
| 20 | Rear Seat Entertainment |
| 21 | Sunroof |
| 22 | Not Used |
| 23 | Not Used |
| 24 | Not Used |
| 25 | Not Used |
| 26 | Info/Airbag |
| 27 | Spare/RF WDW RN SW |
| 28 | Obstacle Detection/USB |
| 29 | Radio |
| 30 | Not Used |
| 31 | Not Used |
| 32 | Not Used |
| 33 | Not Used |
| 34 | Not Used |
| 35 | Not Used |
| 36 | SEO B2 |
| 37 | SEO |
| 38 | Body Control Module 2 |
| 39 | A/C Inverter |
| 40 | Not Used |
| 41 | Not Used |
| 42 | Not Used |
| 43 | Not Used |
| 44 | Right Door Window Motor |
| 45 | Front Blower |
| 46 | Body Control Module 6 |
| 47 | Body Control Module 7 |
| 48 | Amplifier |
| 49 | Right Front Seat |
| 50 | Accessory Power Outlet 3 |
| 51 | Not Used |
| 52 | Retained Accessory Power/Accessory Relay |
| 53 | Not Used |
| 54 | Not Used |
| 55 | Not Used |
| 56 | Not Used |
Rear Compartment Fuse Block
The rear compartment fuse block is behind the access panel on the left side of the compartment.
| ISO Mini Relays | Usage |
| 1 | Rear Defogger |
| Micro Fuses | Usage |
| 2 | Heated Second Row Seat Left |
| 3 | Heated Second Row Seat Right |
| 4 | Heated Mirrors |
| 5 | Liftgate |
| 6 | Glass Breakage |
| 7 | Liftgate Glass |
| 8 | Liftgate Module Logic |
| 9 | Rear Wiper |
| 10 | Rear Heater, Ventilation and Air Conditioning Blower |
| 11 | Second Row Seat |
| 19 | Rear Fog Lamp (if equipped) |
| M-Type Fuses | Usage |
| 12 | Liftgate Module |
| 13 | Third Row Seat |
| 14 | Rear Accessory Power Outlet |
| 15 | Rear Defogger |
| Ultr Micro Rylays | Usage |
| 16 | Liftgate |
| Micro Relays | Usage |
| 17 | Liftgate Glass |
| 18 | Rear Fog Lamp (if equipped) |
| 19 | Heated Mirrors |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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