The Cadillac CTS, produced from 2008 to 2014, is a midsize luxury sedan known for its stylish design, strong performance, and advanced technology features. Its electrical system, which includes the fuse box and relay components, plays a crucial role in maintaining the vehicle’s functionality and reliability.
The fuse box in the Cadillac CTS from 2008 to 2014 contains various fuses that protect specific electrical circuits throughout the car. These circuits power essential components such as the engine control module, lighting systems, infotainment features, climate control, and more. Fuses are designed to interrupt the electrical flow if there is an overload or short circuit, preventing damage to sensitive components.
Relays in the Cadillac CTS act as electrically operated switches that control high-current circuits. They facilitate the precise activation and deactivation of functions like the starter motor, fuel pump, air conditioning compressor, and power windows or seats. Efficient power distribution by relays contributes significantly to the overall performance and reliability of the vehicle.
Regular inspection and maintenance of the fuse box and relays are essential to ensure the Cadillac CTS from 2008 to 2014 operates smoothly. This includes checking fuses for signs of wear or damage, ensuring secure relay connections, and promptly addressing any electrical issues that arise. Proper care of these components helps maintain the vehicle’s electrical integrity, enhancing safety and driving satisfaction for owners of the Cadillac CTS from 2008 to 2014.
MUST READ: DYI – How to Check Car Fuses?
(2008-2014) Cadillac CTS 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 CTS 2008-2014 fuse assignment
- Cigar lighter / power outlet fuses in the Cadillac CTS are located in the Engine compartment fuse box (2008-2009 – see fuse “LTR” (Cigarette Lighter), 2010-2014 – fuse №. 60 (Instrument Panel Auxiliary Power Outlet)) and in the Luggage compartment fuse box (2008-2009 – see fuse “AUX/OUTLET” (Auxiliary Power Outlet), 2010-2014 – fuses №. 17 (Console/Auxiliary Power Outlet and №. 38 (Rear Auxiliary Power Outlet (Wagon)).
Year of production: 2008, 2009, 2010, 2011, 2012, 2013, 2014
Engine compartment
Remove the engine cover.
Luggage compartment
It is located in the right side of the trunk, behind the cover.
Fuse box diagrams
2008, 2009
Engine compartment
CTS (2008)
CTS (2009)
CTS-V (2009)
Assignment of the fuses and relays in the engine compartment (2008, 2009)
| Name | Description |
|---|---|
| Mini Fuses | |
| A/C CLTCH | Air Conditioning Clutch |
| ABS | Antilock Braking System (ABS) |
| AFS | Adaptive Forward Lighting System |
| AIRBAG IGN | Airbag Switch |
| AWD | All-Wheel Drive |
| S/ROOF | Sunroof |
| BCM 1 | Body Control Module 1 |
| BCM 2 | Body Control Module 2 |
| BCM 3 | Body Control Module 3 |
| BCM 4 | Body Control Module 4 |
| BCM 5 | Body Control Module 5 |
| BCM 6 | Body Control Module 6 |
| BCM 7 | Body Control Module 7 |
| BCM 6, BCM 7 | Body Control Module 6 and 7 |
| DISPLY | Display |
| DRL RT | Right Daytime Running Lamp (DRL) |
| DRL/WSW | Daytime Running Lamps/Windshield Washer Pump |
| DRL/ENG PUMP | Daytime Running Lamps |
| ECM | Engine Control Module (ECM) |
| ECM/TCM IGN | ECM, Transmission Control Module (TCM), Instrument Panel Cluster (IPC), PASS-Key III+ Module |
| EMIS 1 | Emission 1 |
| EMIS 2 | Emission 2 |
| EVEN COILS | Even Coils |
| FRT FOG | Front Fog Lamps |
| HDM WASH | Headlamp Driver Module Washer |
| HORN | Horn |
| LO BEAM DRL | Low-Beam DRL |
| LO BEAM DRL LEFT | Low-Beam Daytime Running Lamps (Left) |
| DRL LT | Left Daytime Running Lamps |
| LT HI BEAM | Left High-Beam Headlamp |
| LT LO BEAM | Left Low-Beam Headlamp |
| LT LO BEAM | Left Low-Beam Headlamp |
| DRL/LT LO BEAM | Daytime Running Lamps / Left Low-Beam Headlamp |
| LTR | Cigarette Lighter |
| MISC IGN | Ignition |
| NAV MTR | Navigation Motor |
| ODD COILS | Odd Coils |
| PED PROT | Not Used |
| PWR MODING | PassKey Module, Body Control Module |
| RT HI BEAM | Right High-Beam Headlamp |
| RT LO BEAM | Right Low-Beam Headlamp |
| SPARE | Spare |
| STR/WHL/ILLUM | Steering Wheel Illumination |
| TCM BATT | Transmission Control Module Battery |
| TRANS OIL RLY | Transmission Oil Relay |
| WPR | Windshield Wiper |
| WSW PUMP | Windshield Washer Pump |
| J-Case fuses | |
| ABS MTR | ABS Motor |
| BLWR | Blower |
| BRK VAC PUMP | Brake Vacuum Pump |
| FAN 1 | Cooling Fan 1 |
| FAN 2 | Cooling Fan 2 |
| REAR DEFOG | Rear Defogger |
| SPARE | Spare |
| EPB | Electric Park Brake |
| MRTD | MR Ride/Suspension Control |
| STRTR | Starter |
| TRANS PUMP | Transmission Pump |
| WSW/HTR | Windshield Washer Heater |
| Circuit Breakers | |
| HEAD LAMP WASH | Headlamp Washer |
| Relays | |
| A/C CMPRSR CLTCH | Air Conditioning Compressor Clutch |
| DRL (W/O HID) LO BEAM (HID) | Daytime Running Lamps (without High Intensity Discharge), Low-Beam Headlamps (High Intensity Discharge) |
| LO BEAM | Low Beam |
| INCL | Intercooler Pump |
| ENG PUMP | Engine Pump |
| FAN S/P | Cooling Fan Series/Parallel |
| FAN 1 | Cooling Fan 1 |
| FAN 2 | Cooling Fan 2 |
| HEAD LAMP WASH | Headlamp Washer |
| HI BEAM | High-Beam Headlamp |
| HORN | Horn |
| IGN 1 | Ignition 1 |
| LO BEAM (W/O HID) LT DRL (HID) | Low-Beam (without High Intensity Discharge), Left Daytime Running Lamp (High Intensity Discharge) |
| LT DRL | Left Daytime Running Lamps |
| PWR/TRN | Powertrain |
| REAR DEFOG | Rear Defogger |
| SPARE | Spare |
| STRTR | Starter |
| WPR | Windshield Wiper |
| WPR HI | Windshield Wiper High Speed |
| WSW PUMP | Windshield Washer Pump |
| FOG LAMP | Fog Lamps |
| RT DRL (HID) | Right Daytime Running Lamp (High Intensity Discharge) |
| RT DRL | Right Daytime Running Lamp |
Luggage compartment
Assignment of the fuses and relays in the Luggage compartment (2008, 2009)
| Name | Description |
|---|---|
| AIRBAG | Airbag System |
| AMP | Amplifier |
| AUX/OUTLET | Auxiliary Power Outlet |
| CNSTR/VENT | Canister Vent |
| DR/LCK | Door Lock |
| ECM | Engine Control Module (ECM) |
| FUEL/PUMP | Fuel Pump |
| LT/POS/LP | Left Position Lamp |
| LT/REAR/WNDW | Left Rear Window |
| MSM | Memory Seat Module |
| ONSTAR | OnStar® System |
| PDM | Passenger Door Module |
| RDO | Audio System |
| RDO/SPKR | Audio Speakers |
| REAR/FOG | Not Used |
| REAR/WNDW | Rear Window |
| RKE/PASS-KEY/MDL | Remote Keyless Entry System, Pass-Key Theft Deterrent Feature Module |
| RT/POS/LP | Right Position Lamp |
| RVC/SNSR | Regulated Voltage Control Sensor |
| S/ROOF | Sunroof |
| FSCM | Fuel System Control Module |
| SPARE | Spare |
| STOP/LP | Stoplamp |
| THEFT/UGDO | Theft Deterrent System, Universal Home Remote System |
| TRUNK/RELSE | Trunk Release |
| Relays | |
| FUEL/PUMP | Fuel Pump |
| LCK | Lock |
| LT FRT/PWR/SEAT | Left Front Power Seat |
| LT/POS/LP | Left Position Lamp |
| PWR CLMN | Power Steering Column |
| PWR/WNDW | Power Window |
| REAR/FOG | Not Used |
| RT FRT/PWR/SEAT | Right Front Power Seat |
| RT/POS/LP | Right Position Lamp |
| SPARE | Spare |
| FUEL/DR/RELSE | Not Used |
| STOP/LP | Stoplamp |
| TRUNK/RELSE | Trunk Release |
| UNLCK | Unlock |
2010, 2011, 2012, 2013, 2014
Engine compartment
Assignment of the fuses and relays in the Engine compartment (2010-2014)
| № | Description |
|---|---|
| Mini-Fuses | |
| 11 | Not Used |
| 19 | Antilock Braking System (ABS) |
| 22 | Display |
| 23 | Not Used CTS-V Wagon: Sunroof |
| 24 | Body Control Module 1 |
| 25 | Automatic Forward Lighting System (HID Only) |
| 26 | Body Control Module 5 |
| 27 | Body Control Module 4 |
| 28 | Navigation Motor |
| 29 | CTS: All-Wheel Drive CTS-V: Not Used |
| 30 | Transmission Control Module Battery |
| 31 | Horn |
| 33 | CTS: Left Low‐Beam Headlamp (Domestic Non‐HID Only) CTS-V: Not Used |
| 34 | Pedestrian Protection System (Export Only) |
| 35 | Body Control Module 3 |
| 36 | Body Control Module 2 |
| 38 | Headlamp Washer (HID Only) |
| 40 | CTS: Right Low‐Beam Headlamp (Domestic Non‐HID Only) CTS-V: Not Used |
| 41 | Air Conditioning Compressor Clutch |
| 43 | Low‐Beam Daytime Running Lamps (non‐HID), Left Daytime Running Lamps (HID), Left Trailer Turn Signal (Export Only) |
| 46 | Left High‐Beam Headlamp |
| 47 | Right High‐Beam Headlamp |
| 50 | Right Daytime Running Lamp, Windshield Washer Pump |
| 51 | Airbag System Ignition Switch |
| 52 | Engine Control Module Ignition, Transmission Control Module Ignition |
| 54 | Power Moding (Immobilizer Module, Ignition Switch) |
| 55 | CTS: Not Used CTS-V: Intercooler Pump |
| 56 | Windshield Wipers |
| 57 | Right Low‐Beam (HID Only) |
| 58 | Daytime Running Lamps (non‐HID), Left Low‐Beam (HID Only) |
| 59 | Right Daytime Running Lamp (HID Only), Right Trailer Turn Signal (Export Only) |
| 60 | Instrument Panel Auxiliary Power Outlet |
| 61 | Air Quality Sensor, Inside Rear View Mirror, Rear Camera |
| 62 | Ignition |
| 64 | Steering Wheel Illumination |
| 65 | Front Fog Lamps (HID Only) |
| 69 | Body Control Module 6, Body Control Module 7 |
| 70 | Emissions 1 |
| 71 | Even Ignition Coils |
| 72 | CTS: Engine Control Module CTS-V: Odd Ignition Coils |
| 73 | Emissions 2 |
| 74 | CTS: Odd Ignition Coils CTS-V: Engine Control Module |
| 75 | CTS: Transmission Output Speed Sensor, Brake Vacuum Relay CTS-V: Not Used |
| 76 | Spare |
| 77 | Spare |
| 78 | Spare |
| 79 | Spare |
| 80 | Spare |
| 81 | Spare |
| J-Case Fuses | |
| 6 | Cooling Fan 2 |
| 7 | Cooling Fan 1 |
| 8 | Starter |
| 9 | CTS: Brake Vacuum Pump CTS-V: Not Used |
| 10 | Antilock Brake System Motor |
| 13 | Not Used |
| 14 | Electric Parking Brake |
| 15 | Not Used |
| 16 | Not Used |
| 17 | Blower Motor |
| 18 | CTS Coupe and Sedan, CTS-V Wagon: Rear Window Defogger CTS Wagon: Transmission Control Module Battery |
| 37 | CTS: Trailer (Export Only) CTS-V: Magnetic Ride/Suspension Control |
| Relays | |
| 1 | Cooling Fan 2 |
| 2 | Cooling Fan 1 |
| 3 | Starter |
| 4 | Rear Window Defogger |
| 5 | Instrument Panel Auxiliary Power Outlet |
| 12 | Horn |
| 20 | Headlamp Washer (HID Only) |
| 21 | Cooling Fan (Series/Parallel) |
| 32 | Air Conditioning Compressor Clutch |
| 39 | Coupe and Sedan: Windshield Washer Pump Wagon: Not used |
| 42 | Right Daytime Running Lamp, Trailer Turn Signal |
| 44 | Low‐Beam (non‐HID), Left Daytime Running Lamps (HID), Left Trailer Turn Signal (Export Only) |
| 45 | Front Fog Lamps (HID Only) |
| 48 | High‐Beam Headlamps |
| 49 | Daytime Running Lamps (Non‐HID), Low‐Beam Headlamps (HID) |
| 53 | Not Used |
| 63 | Main Ignition |
| 66 | Windshield Wipers |
| 67 | Powertrain |
| 68 | Windshield Wipers High Speed |
Luggage compartment
Assignment of the fuses and relays in the Luggage compartment (2010-2014)
| № | Description |
|---|---|
| Mini-Fuses | |
| 14 | Right Position Lamp |
| 15 | Left Position Lamp |
| 16 | Door Lock |
| 17 | Console/Auxiliary Power Outlet |
| 18 | Rear Fog/Export Body Control Module (Export Only) |
| 19 | Coupe and Sedan: Trunk Release Wagon: Rear Windshield Wiper/Washer |
| 20 | Coupe: Easy Entry Seats Wagon: Windshield Washer Pump |
| 21 | CTS: Sunroof CTS-V: Fuel Pump |
| 22 | Right Position Lamp (Export Only) |
| 23 | Regulated Voltage Control Sensor |
| 24 | Audio System (Radio) |
| 25 | Airbag System |
| 26 | Remote Keyless Entry/PASS‐Key® Theft Deterrent Module |
| 27 | Audio Speakers/Subwoofer |
| 28 | OnStar System |
| 29 | Engine Control Module |
| 30 | Canister Vent |
| 31 | CTS: Fuel Pump CTS-V: Rear Differential Cooling Pump |
| 33 | Stop Lamps (Export Only) |
| 34 | Theft Deterrent System/Universal Garage Door Opener |
| 35 | Memory Seat Module |
| 36 | Passenger Door Module |
| 38 | Coupe and Sedan: Not Used Wagon: Rear Auxiliary Power Outlet |
| 39 | Amplifier |
| Circuit Breakers | |
| 1 | Driver Power Seat Switch |
| 2 | Passenger Power Seat Switch |
| 3 | Power Windows |
| 4 | Power Steering Column |
| 32 | Left Rear Window Switch |
| 37 | Right Rear Window Switch |
| Relays | |
| 5 | Stop Lamps (Export Only) |
| 6 | Door Lock |
| 7 | Door Unlock |
| 8 | Fuel Door Unlock (Export Only) |
| 9 | Right Position Lamp (Export Only) |
| 10 | Console/Auxiliary Power Outlet |
| 11 | Coupe and Sedan: Trunk Release Wagon: Not used |
| 12 | Side Marker Lamps |
| 13 | Left Position Lamps |
Conclusion
For owners and enthusiasts of classic Cadillac CTS 2008-2014, 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.
