The Cadillac Lyriq, introduced for the 2023-2024 model years, represents Cadillac’s entry into the electric vehicle (EV) market. As an electric luxury SUV, it features an advanced electrical system where traditional components like the fuse box and relay are reimagined for electric propulsion.
In the Cadillac Lyriq, the fuse box serves a similar purpose as in traditional vehicles, protecting electrical circuits from overload. However, its primary focus may be on managing power distribution among various components of the electric drivetrain, battery management system, and other onboard electronics crucial for EV operation.
Relays in the Cadillac Lyriq also play a critical role but may differ from traditional relays in internal combustion engine vehicles. They facilitate the activation and deactivation of high-current circuits related to the electric motors, battery systems, and auxiliary systems like heating and cooling. Efficient relay operation ensures optimal performance and energy management in the electric vehicle.
Maintenance of the fuse box and relays in the Cadillac Lyriq is crucial for ensuring reliable operation of the electric systems. Regular inspections are needed to check for any faults, ensuring components are functioning correctly to maintain the vehicle’s electrical integrity and maximize driving range and efficiency in this innovative Cadillac model.
MUST READ: DYI – How to Check Car Fuses?
(2023-2024) Cadillac Lyriq fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Cadillac Lyriq 2023-2024 fuse assignment
Year of production: 2023, 2024
Passenger Compartment Fuse Box
Fuse Box Location
The instrument panel fuse block is to the right of the glove box.
To Access the Fuses:
- Remove the panel, starting at the top.
- Once the panel clips disengage, the tabs along the bottom of the door can disengage from the instrument panel to remove the door.
- To reinstall the door, place the bottom tabs into the slots, and rotate the door into position, engaging the clips.
Fuse Box Diagram
Assignment of the fuses in the passenger compartment
| № | Usage |
|---|---|
| F1 | – |
| F2 | Auxiliary Power Outlet Instrument Panel / Cigar Lighter |
| FB | – |
| F4 | Universal Serial Bus Port / Auxiliary Power Outlet Alternating Current 150W |
| F5 | Steering Column Lock |
| F6 | Exterior Lighting Module 1 |
| F7 | Amplifier (Base) |
| F8 | Right Door Latch |
| F9 | Left Door Latch |
| F10 | Steering Column Position Module |
| F11 | Compute Platform 4 |
| F12 | – |
| F13 | Trailer Control and Electrification Control Processor (Traction Power Inverter 1 and 2) / Vehicle Integration Control Module |
| F14 | Headlamps |
| F15 | Headlamp Right |
| F16 | Steering Column Lock / Clock Spring |
| F17 | Seat Fan Passenger and Seat Fan Driver |
| F18 | Virtual Cockpit Display and Short Range Radar |
| F19 | Miscellaneous 2 Switch Bank / Electronic Toll Collection / lnterior Particulate Matter Sensor / Reflective Light Auxiliary Display and Miscellaneous 1 Electronic Brake Control Module / Exterior Lighting Module / Sensing and Diagnostic Module / lnside Rear View Mirror |
| F20 | Body Control Module 1 and Vehicle Integration Control Module |
| F21 | Long Range Radar – Rear and Electric Park Brake Switch / Electronic Transmission Range Select Shifter Module |
| F22 | Virtual Key Module / Virtual Key Backup Module / Auxiliary Jack |
| F23 | Tail Lamp Right and Tail Lamp Left |
| F24 | Universal Park Assist / Automatic Park Assist / Side Blind Zone Alert and Sensing Diagnostic Module / Automatic Occupant Sensing Module |
| F25 | Compute Platform 2 / External Object Calculating Module / Front Camera Module / Multi Function Control and Driver Monitoring System / Central Gateway Module / Diagnostic Link Connector / Vehicle Data Monitor |
| F26 | Electrification Control Processor Battery 2 / Air Condition Electric Compressor and Heads-Up Display / Heating, Ventilation and Air Conditioning Display |
| F27 | Body Control Module 3 |
| F28 | Body Control Module 2 |
| F29 | Amplifier (Uplevel) |
| F30 | Body Control Module 4 |
| F31 | Video Processing Module / SD Card / lndicator Light and Solar Sensor / Over Head Console |
| F32 | Heated Steering Wheel Module |
| F33 | Long Range Radar Front / Light Detection and Ranging |
| F34 | Exterior Lighting Module 2 |
| F35 | Headlamp Left |
| F36 | Virtual Cockpit Unit Battery 1 |
| F37 | Telematics Communication Platform (OnStar) |
| F38 | Wireless Charger Module |
| F39 | High Voltage System Lockout |
| F40 | Virtual Cockpit Unit Battery 2 |
| F41 | Exterior Lighting Module 6 |
| F42 | – |
Front Compartment Fuse Box
Fuse Box Location
The Underhood Compartment Fuse Block is under a cover and side extension/shield in the underhood compartment.
To Access:
- Unclip right side of shield and remove the right side access cover;
- Remove the M6 bolt to access the fuse block;
- Open the fuse block cover – press the clips at the side and back and pull the cover up.
Fuse Box Diagram
Assignment of the fuses in the front compartment
| № | Usage |
|---|---|
| 1 | Spare |
| 2 | – |
| 3 | Spare |
| 4 | Spare |
| 5 | Spare |
| 6 | Memory Seat Module / Memory Bolster Module |
| 7 | Primary Evaporator Expansion Valve / Secondary Evaporator Expansion Valve and External Condenser Flow Valve / Condensing Heater Flow Valve |
| 8 | Motor Main Coolant Valve and Air Condition Electric Compressor |
| 9 | Power Electronics Coolant Pump and Energy Storage System Coolant Pump |
| 10 | – |
| 11 | – |
| 12 | Electrification Control Processor (Traction Power Inverter Module 2) & On Board Charging Module 2 |
| 13 | – |
| 14 | – |
| 15 | Trailer Park Lamps |
| 16 | Trailer Reverse Lamp |
| 17 | – |
| 18 | Glove Box Release |
| 19 | – |
| 20 | – |
| 21 | Charqe Port Door Motor |
| 22 | Alternate Current / Direct Current Inverter Module |
| 23 | – |
| 24 | – |
| 25 | – |
| 26 | Spare |
| 27 | – |
| 28 | Electronic Toll Control Module |
| 29 | – |
| 30 | Rear Cargo Auxiliary Power Outlet |
| 31 | Trailer Interface Module Battery Source 1 |
| 32 | Spare |
| 33 | Spare |
| 34 | Exterior Lighting Module 5 |
| 35 | Exterior Lighting Module 4 |
| 36 | – |
| 37 | – |
| 38 | Exterior Lighting Module 7 |
| 39 | Exterior Lighting Module 3 |
| 40 | Electrification Control Processor (Traction Power Inverter Module 1) Source 3 and 1 |
| 41 | Door Switch Panel and Suspension Control Leveling 2 |
| 42 | Seat Position Switch and Virtual Key Module Sensor / Rain Light Humidity Sensor |
| 43 | Steering Column Lock and Charge Interface Module |
| 44 | Power Sounder Module and Aero Shutter |
| 45 | Remote Function Actuator Module and Handsfree Closure Module |
| 46 | Adaptive Forward Lighting / Automatic Headlamp Leveling and Pedestrian Friendly Alert Module |
| 47 | Lit Grille / Front Park Emblem and Semi Active Damping System |
| 48 | Power Tailgate |
| 49 | – |
| 50 | Motor Window Lifter |
| 51 | Suspension Control Leveling 1 |
| 52 | Motor Window Lifter Riqht |
| 53 | Front Wiper |
| 54 | Trailer Battery |
| 55 | – |
| 56 | Fold Seat Riqht Motor |
| 57 | Electronic Brake Control Module |
| 58 | Front Blower Motor |
| 59 | – |
| 60 | Horn |
| 61 | Rear Defog |
| 62 | Rear Blower Motor |
| 63 | Motor Sunroof and Motor Sunshade |
| 64 | Power Seat Driver |
| 65 | Power Seat Passenger Driver |
| 66 | Condenser Radiator Fan Module |
| 67 | Heated Wiper |
| 68 | Spare |
| 69 | Spare |
| 70 | RELAY’S COIL |
| 71 | Rear Heated Seat 2 |
| 72 | Front Heated Seat 1 |
| 73 | Fold Seat Left Motor |
| 74 | Trailer Interface Module Battery Source 2 |
| 75 | Spare |
| 76 | Spare |
| 77 | Spare |
| 78 | Trailer Stop Turn Left and Trailer Stop Turn Right |
| 79 | Rear Heated Seat 1 |
| 80 | Front Heated Seat 2 |
| 81 | Out of Park Disable |
| 82 | Wash Pump (Front) |
| 83 | Camera Wash |
Conclusion
For owners and enthusiasts of classic Cadillac Lyriq 2023-2024, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Cadillac’s craftsmanship and innovation in the automotive industry during that era.
