The Cadillac XTS 2018-2019 is a luxury sedan known for its spacious interior, advanced technology features, and smooth driving experience. When it comes to electrical components like the fuse box and relay system in the Cadillac XTS, they are crucial for ensuring the proper functioning of various vehicle systems.
The fuse box in the Cadillac XTS houses fuses that protect electrical circuits from overloads, which could otherwise damage sensitive components such as the engine control unit, entertainment systems, and climate control. Each fuse is designed to break the circuit if excessive current flows through it, preventing electrical failures and ensuring safety.
Relays in the XTS serve as electrically operated switches that control high-current circuits. They play a key role in activating functions like the starter motor, fuel pump, and power windows. Relays help manage power distribution efficiently throughout the vehicle, contributing to its smooth operation and reliability.
Regular inspection and maintenance of the fuse box and relays are essential to prevent electrical issues in the Cadillac XTS 2018-2019. Owners and technicians should periodically check and replace fuses as needed, and ensure proper relay function and secure connections. This proactive approach helps maintain optimal performance and reliability of the vehicle’s electrical systems over time.
MUST READ: DYI – How to Check Car Fuses?
(2018-2019) Cadillac XTS 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 XTS 2018-2019 fuse assignment
- Cigar lighter (power outlet) fuses in the Cadillac XTS are the fuses №. 6 and 7 in the Instrument panel fuse box.
Year of production: 2018-2019
Passenger compartment
The fuse box is located in instrument panel, behind the fuse panel door (open the fuse panel door by pulling down at the top, press in on the sides of the door to release it from the instrument panel).
Engine compartment
To remove the cover, squeeze the three retaining clips on the cover and lift it straight up.
Luggage compartment
The fuse block is located on the left side of the trunk, behind the cover.
Fuse box diagrams
2018, 2019
Instrument panel
Assignment of the fuses and relays in the instrument panel
| № | Usage |
|---|---|
| 1 | Wireless charger module/USB charge |
| 2 | Body control module 7 |
| 3 | Body control module 5 |
| 4 | Radio |
| 5 | Infotainment display/ Head-up display/ Instrument cluster |
| 6 | Power outlet 1 |
| 7 | Power outlet 2 |
| 8 | Body control module 1 |
| 9 | Body control module 4 |
| 10 | Body control module 8 |
| 11 | Front HVAC blower |
| 12 | Passenger seat |
| 13 | Driver seat |
| 14 | Diagnostic link connector |
| 15 | Airbag AOS |
| 16 | Glove box |
| 17 | HVAC controller |
| 18 | Logistics |
| 19 | Front camera |
| 20 | Telematics (OnStar) |
| 21 | CGM |
| 22 | Steering wheel controls/Backlight |
| 23 | Body control module 3 |
| 24 | Body control module 2 |
| 25 | Power steering column |
| 26 | AC DC inverter |
| Relays | |
| R1 | Glove box |
| R2 | Logistics |
| R3 | Retained accessory power |
Engine compartment
Assignment of the fuses and relays in the engine compartment
| № | Usage |
|---|---|
| 1 | Transmission control module |
| 2 | Engine control module |
| 4 | Not used |
| 5 | Engine control module/Ignition |
| 6 | Front wiper |
| 7 | Not used |
| 8 | Ignition coils – even |
| 9 | Ignition coils – odd |
| 10 | Engine control module |
| 11 | Mass air flow sensor/ Post catalytic converter O2 sensors |
| 12 | Starter |
| 13 | Transmission control module/Chassis control module ignition |
| 14 | Rear heated seat -passenger side |
| 15 | Rear heated seat – driver side |
| 16 | Not used |
| 17 | Sunshade/Ventilated seats |
| 18 | Autonet |
| 19 | Not used |
| 20 | Not used |
| 21 | Rear power windows |
| 22 | Sunroof |
| 23 | Variable effort steering module |
| 24 | Front power windows |
| 25 | Retained accessory power |
| 26 | ABS pump |
| 27 | Electric parking brake |
| 28 | Rear window defogger |
| 29 | Passive entry/Passive start |
| 30 | Spare |
| 31 | Heated driver seat |
| 32 | Stoplamps – center high mounted stoplamp/ Backup-reverse lamps/Interior |
| 33 | Heated passenger seat |
| 34 | ABS valves |
| 35 | Amplifier |
| 36 | Taillamp – driver side |
| 37 | Right high-beam headlamp |
| 38 | Left high-beam headlamp |
| 39 | Taillamp -passenger side |
| 40 | Long range radar |
| 41 | Brake vacuum assist pump |
| 42 | Cooling fan high speed |
| 43 | Not used |
| 44 | Not used |
| 45 | Cooling fan low speed |
| 46 | Cooling fan control |
| 47 | Pre-catalytic converter O2 sensor heater/Canister purge solenoid |
| 48 | Low temperature radiator coolant pump |
| 49 | Right headlamp LED |
| 50 | Left headlamp LED |
| 51 | Horn |
| 52 | Display/Ignition |
| 53 | Air quality sensor/ Inside mirror/Rear vision camera |
| 54 | HVAC/Reflective LED alert display |
| 55 | Driver and passenger door switches/Outside rearview mirror switch/Mirror memory module |
| 56 | Windshield washer |
| 57 | Not used |
| 58 | Not used |
| 59 | Not used |
| 60 | Heated outside mirror |
| 61 | Not used |
| 62 | Front seats massage module |
| 63 | Not used |
| 64 | Spare |
| 65 | Spare |
| 66 | Trunk release |
| 67 | Chassis control module |
| 68 | Not used |
| 69 | Battery voltage sensor |
| 70 | Canister vent solenoid |
| 71 | Memory seat module |
| 72 | Electric power steering |
| Relays | |
| 1 | A/C clutch |
| 2 | Starter |
| 3 | Not used |
| 4 | Wiper speed |
| 5 | Wiper control |
| 6 | Not used |
| 7 | Powertrain |
| 8 | Not used |
| 9 | Cooling fan – high speed |
| 10 | Cooling fan – low speed |
| 11 | Taillamps/Parking lamps |
| 12 | Not used |
| 13 | Cooling fan control |
| 14 | Low-beam LED headlamps |
| 15 | Run/Crank |
| 16 | Not used |
| 17 | Rear window and mirror defogger |
Luggage compartment
Assignment of the fuses and relays in the luggage compartment
| № | Usage |
|---|---|
| F01 | Not used |
| F02 | Not used |
| F03 | Not used |
| F04 | Suspension leveling compressor |
| F05 | Not used |
| F06 | Not used |
| F07 | Not used |
| F08 | Not used /Front courtesy lamps/Footwell, puddle lamps |
| F09 | Not used |
| F10 | Not used |
| F11 | Not used |
| F12 | Not used |
| F13 | Spare/MID Power Window |
| F14 | Not used |
| F15 | Not used/Spare |
| F16 | Not used/Video processing module |
| F17 | Not used |
| F18 | Semi-active damping system |
| F19 | Universal remote system/Rain, light, and humidity sensor |
| F20 | Not used/Shunt |
| F21 | Side blind zone alert |
| F22 | Not used |
| F23 | All wheel drive |
| F24 | Not used |
| F25 | Not used |
| F26 | Not used |
| F27 | Not used |
| F28 | Not used |
| F29 | Not used |
| F30 | External object calculation module |
| F31 | Park assist/Lane departure warning/ Lane keep assist |
| F32 | Not used |
| F33 | Not used |
| F34 | Not used |
| F35 | Not used |
| F36 | Not used |
| F37 | Not used |
| Relays | |
| K1 | Not used |
| K2 | Front courtesy lamps/ Footwell, puddle lamps |
| K3 | Suspension leveling compressor |
| K4 | Not used |
Conclusion
For owners and enthusiasts of classic Cadillac XTS 2018-2019, 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.
