Underhood Fuse Block (CTS-V)
The underhood fuse block is located on the passenger side of the engine compartment.
| Fuses | Usage |
| A/C CLTCH | Air Conditioning Clutch |
| ABS | Antilock Braking System (ABS) |
| AFS | Adaptive Forward Lighting System |
| AIRBAG IGN | Airbag Switch |
| AQS/ISRVM/REAR CAMERA | Air Quality Sensor/Inside Rear ViewMirror/Rear View Camera |
| 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, BCM 7 | Body Control Module 6 and 7 |
| DISPLY | Display |
| DRL RT | Right Daytime Running Lamp |
| DRL/WSW | Daytime Running Lamps/Windshield Washer Pump |
| 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 |
| HORN | Horn |
| INTCLR | Intercooler Pump |
| LT HI BEAM | Left High-Beam Headlamp |
| LT LO BEAM | 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/CNTRL | Steering Wheel Illumination |
| S/ROOF | Sunroof |
| TCM BATT | Transmission Control Module Battery |
| WPR | Windshield Wiper |
| J Cases | Usage |
| ABS MTR | ABS Motor |
| BLWR | Blower |
| EPB | Electric Park Brake |
| FAN 1 | Cooling Fan 1 |
| FAN 2 | Cooling Fan 2 |
| REAR DEFOG | Rear Defogger |
| SPARE | Spare |
| EPB | Electric Park Brake |
| STRTR | Starter |
| SPARE | Spare |
| WSW/HTR | Not used |
| Relays | Usage |
| A/C CMPRSR | Air Conditioning Compressor Clutch |
| FAN S/P | Cooling Fan Series/Parallel |
| FAN 1 | Cooling Fan 1 |
| FAN 2 | Cooling Fan 2 |
| FOG LAMP | Fog Lamps |
| HDLP WASH | Headlamp Washer |
| HI BEAM | High-Beam Headlamp |
| HORN | Horn |
| IGN 1 | Ignition 1 |
| INTCLR | Intercooler Pump |
| LT DRL | Left Daytime Running Lamps |
| LO BEAM | Low Beam |
| PWR/TRN | Powertrain |
| REAR DEFOG | Rear Defogger |
| RT DRL | Right Daytime Running Lamp |
| SPARE | Spare |
| STRTR | Starter |
| WPR | Windshield Wiper |
| WPR HI | Windshield Wiper High Speed |
| WSW | Daytime Running Lamps/Windshield Washer Pump |
Underhood Fuse Block (CTS Wagon)
The underhood fuse block is located on the passenger side of the engine compartment.
| Fuses | Usage |
| A/C CLTCH | Air Conditioning Clutch |
| ABS | Antilock Braking System (ABS) |
| AFS | Adaptive Forward Lighting System |
| AIRBAG IGN | Airbag Switch |
| AQS/ISRVM/REAR CAMERA | Air Quality Sensor/Inside Rear ViewMirror/Rear View Camera |
| AWD | All-Wheel Drive |
| 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, BCM 7 | Body Control Module 6 and 7 |
| DISPLY | Display |
| DRL RT | Right Daytime Running Lamp |
| DRL/LT LO BEAM | Daytime Running Lamps/Left Low-Beam Headlamp |
| DRL/WSW | Daytime Running Lamps/Windshield Washer Pump |
| 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 |
| HDLP WASH | Headlamp Washer |
| HORN | Horn |
| LO BEAM DRL LEFT | Low-Beam Daytime Running Lamps (Left) |
| LT HI BEAM | Left High-Beam Headlamp |
| LT LO BEAM | 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 |
| PWR OUTLET | Console Auxiliary Power Outlet |
| RT HI BEAM | Right High-Beam Headlamp |
| RT LO BEAM | Right Low-Beam Headlamp |
| RT LO BEAM | Right Low-Beam Headlamp |
| SPARE | Spare |
| STR/WHL/CNTRL | Steering Wheel Illumination |
| TCM BATT | Transmission Control Module Battery |
| TOSS/BRK VAC RLY | Transmission Output Speed Sensor/Brake Vacuum Relay |
| WPR | Windshield Wiper |
| J Cases | Usage |
| ABS MTR | ABS Motor |
| BLWR | Blower |
| BRK VAC PUMP | Brake Vacuum Pump |
| EPB | Electric Park Brake |
| FAN 1 | Cooling Fan 1 |
| FAN 2 | Cooling Fan 2 |
| REAR DEFOG | Rear Defogger |
| SPARE | Spare |
| STRTR | Starter |
| TRLR | Trailer Towing |
| WSW/HTR | Not used |
| Relays | Usage |
| A/C CMPRSR | Air Conditioning Compressor Clutch |
| DRL (W/O HID) LO BEAM (HID) | Daytime Running Lamps (without High Intensity Discharge), Low-Beam Headlamps (High Intensity Discharge) |
| FAN S/P | Cooling Fan Series/Parallel |
| FAN 1 | Cooling Fan 1 |
| FAN 2 | Cooling Fan 2 |
| FOG LAMP | Fog Lamps |
| HDLP 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) |
| PWR/TRN | Powertrain |
| REAR DEFOG | Rear Defogger |
| RT DRL (HID) | Right Daytime Running Lamp (High Intensity Discharge) |
| SPARE | Spare |
| STRTR | Starter |
| WPR | Windshield Wiper |
| WPR HI | Windshield Wiper High Speed |
Rear Compartment Fuse Block (CTS)
The rear compartment fuse block is located on top of the battery, on the right side of the trunk. The battery access door must be removed to access the fuse block.
| Relay | Usage |
| FUEL/PUMP | Fuel Pump |
| LCK | Lock |
| LT/POS/LP | Left Position Lamp |
| MRKR/LP | Not Used |
| REAR/FOG | Not Used |
| RT/POS/LP | Not Used |
| STOP/LP | Not Used |
| TRUNK/RELSE | Trunk Release |
| UNLCK | Unlock |
| Mini-fuses | Usage |
| AIRBAG | Airbag System |
| AMP | Amplifier |
| AUX/OUTLET | Auxiliary Power Outlet |
| CNSTR/VENT | Canister Vent |
| DR/LCK | Door Lock |
| ECM | Engine Control Module (ECM) |
| EE SEAT | Not Used |
| FUEL/PUMP | Fuel Pump |
| LT/POS/LP | Left Position Lamp |
| MSM | Memory Seat Module |
| ONSTAR | OnStar® System |
| PDM | Passenger Door Module |
| RDO | Audio System |
| RDO/SPKR | Audio Speakers |
| REAR/FOG | Not Used |
| RKE/PASS-KEY/MDL | Remote Keyless Entry System, Pass-Key Theft Deterrent Feature Module |
| RT/POS/LP | Not Used |
| RT/POS/LP | Right Position Lamp |
| RVC/SNSR | Regulated Voltage Control Sensor |
| S/ROOF | Sunroof |
| STOP/LP | Not Used |
| THEFT/UGDO | Theft Deterrent System, Universal Home Remote System |
| TRUNK/RELSE | Trunk Release |
| Circuit Breakers | Usage |
| DRV/PWR/SEAT | Left Front Power Seat |
| LT/ REAR/ WNDW | Left Rear Window |
| PWR CLMN | Power Steering Column |
| PWR/WNDW | Power Window |
| PASS/ PWR/SEAT | Right Front Power Seat |
| REAR/WNDW | Right Rear Window |
Rear Compartment Fuse Block (CTS-V)
The rear compartment fuse block is located on top of the battery, on the right side of the trunk. The battery access door must be removed to access the fuse block.
| Relay | Usage |
| FUEL/PUMP | Fuel Pump |
| LCK | Lock |
| LT/POS/LP | Left Position Lamp |
| MRKR/LP | Not Used |
| REAR/FOG | Not Used |
| RT/POS/LP | Not Used |
| STOP/LP | Not Used |
| TRUNK/RELSE | Trunk Release |
| UNLCK | Unlock |
| Mini-fuses | Usage |
| AIRBAG | Airbag System |
| AMP | Amplifier |
| AUX/OUTLET | Auxiliary Power Outlet |
| CNSTR/VENT | Canister Vent |
| DR/LCK | Door Lock |
| ECM | Engine Control Module (ECM) |
| EE SEAT | Not Used |
| FUEL/PUMP | Fuel Pump |
| LT/POS/LP | Left Position Lamp |
| MSM | Memory Seat Module |
| ONSTAR | OnStar® System |
| PDM | Passenger Door Module |
| RDO | Audio System |
| RDO/SPKR | Audio Speakers |
| REAR/DIFF/PUMP | Rear Differential Cooling Pump |
| REAR/FOG | Not Used |
| RKE/PASS-KEY/MDL | Remote Keyless Entry System, Pass-Key Theft Deterrent Feature Module |
| RT/POS/LP | Right Position Lamp |
| RT/POS/LP | Not used |
| RVC/SNSR | Regulated Voltage Control Sensor |
| SPARE | Spare |
| STOP/LP | Not Used |
| THEFT/UGDO | Theft Deterrent System, Universal Home Remote System |
| TRUNK/RELSE | Trunk Release |
| Circuit Breakers | Usage |
| DRV/PWR/SEAT | Left Front Power Seat |
| LT/ REAR/ WNDW | Left Rear Window |
| PASS/PWR/SEAT | Right Front Power Seat |
| PWR CLMN | Power Steering Column |
| PWR/WNDW | Power Window |
| REAR/WNDW | Right Rear Window |
Rear Compartment Fuse Block (Wagon)
The rear compartment fuse block is located on top of the battery, on the right side of the trunk. The battery access door must be removed to access the fuse block.
| Relay | Usage |
| FUEL/PUMP | Fuel Pump |
| LCK | Lock |
| LT/POS/LP | Left Position Lamp |
| MRKR/LP | Not Used |
| REAR/FOG | Not Used |
| RT/POS/LP | Not Used |
| STOP/LP | Not Used |
| TRUNK/RELSE | Trunk Release |
| UNLCK | Unlock |
| Mini-fuses | Usage |
| 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 |
| MSM | Memory Seat Module |
| ONSTAR | OnStar® System |
| PDM | Passenger Door Module |
| RDO | Audio System |
| RDO/SPKR | Audio Speakers |
| REAR/FOG | Not Used |
| RKE/PASS-KEY/MDL | Remote Keyless Entry System, Pass-Key Theft Deterrent Feature Module |
| RT/POS/LP | Not Used |
| RT/POS/LP | Right Position Lamp |
| RVC/SNSR | Regulated Voltage Control Sensor |
| S/ROOF | Sunroof |
| STOP/LP | Not Used |
| TRLR/POS/LP | Trailer Turn Position Lamps |
| WASH/PUMP | Windshield Washer Pump |
| Circuit Breakers | Usage |
| DRV/PWR/SEAT | Left Front Power Seat |
| LT/ REAR/ WNDW | Left Rear Window |
| PASS/PWR/SEAT | Right Front Power Seat |
| PWR CLMN | Power Steering Column |
| PWR/WNDW | Power Window |
| REAR/WNDW | Right Rear Window |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.