Cadillac STS (2008 – 2009) – fuse box diagram
Year of production: 2008, 2009
Underhood Fuse Block
The underhood fuse block is located in the front of the engine compartment on the passenger’s side of the vehicle.
| Fuses JCase | Usage |
| ABS MTR | ABS Module- ABS Module-StabiliTrak® |
| AFS | Active Front Steering |
| BLWR | Blower Motor |
| FAN 1 | Cooling Fan-Low Speed |
| FAN 2 | Cooling Fan-High Speed |
| LPDB 1 | Driver Side Rear Fuse Block |
| LPDB 2 | Driver Side Rear Fuse Block |
| RPDB 1 | Passenger Side Rear Fuse Block |
| RPDB 2 | Passenger Side Rear Fuse Block |
| SPARE | Spare |
| SPARE | Spare |
| STRTR | Starter |
| Fuses Mini | Usage |
| A/C CLTCH | Air Conditioning Compressor Clutch |
| ABS | ABS Module-StabiliTrak® |
| ABS IGN | Antilock Brake Controller |
| AUX OUTLET | Rear Accessory Power Outlet |
| BRK VAC PUMP | Brake Vacuum Pump |
| CCP | Climate Control Panel |
| CCP/RLY COILS | Climate Control Panel, Headlamp Level Control, Active Cruise Control, Relay Coils, Starter, Front Blower |
| ECM 1 | Engine Control Module (ECM) |
| ECM/TCM BATT | ECM, Transmission Control Module (TCM) |
| ECM/TCM IGN | ECM, TCM, Instrument Panel Cluster |
| EKM/I/P MDL | Easy Key Module (EKM), Instrument Panel Module (I/P MDL) |
| EVEN COILS | Even Ignition Coils, Even Fuel Injectors |
| FOG LAMP | Front Fog Lamps |
| FRT PWR OUTLET | Front Accessory Power Outlet |
| FUEL COOL | Fuel Cooling |
| HORN | Horn |
| HTD WASH/AQS | Heated Headlamp Washer, Air Quality Sensor |
| HUD | Heads-Up Display, Steering Column Switch |
| I/BEAM | IntelliBeam Relay |
| I/P MDL/ALDL | Instrument Panel Module, Assembly Line Data Link Connector |
| LIC DIM | License Plate, Instrument Panel Dimming |
| LT HI BEAM | Driver Side High Beam Headlamp |
| LT LO BEAM | Driver Side Low Beam Headlamp |
| LT PRK | Driver Side Park Lamp/Driver Side Taillamp |
| ODD COILS | Odd Ignition Coils, Odd Fuel Injectors |
| POST O2 SNSR | Post Oxygen Sensor |
| PRE O2 SNSR | Pre Oxygen Sensor, CAM Sensors |
| RAIN SNSR/TPM | Rain Sensor, Relay Coil: Headlamp Wash |
| RT HI BEAM | Passenger Side High Beam Headlamp |
| RT LO BEAM | Passenger Side Low Beam Headlamp |
| RT PRK | Passenger Side Park Lamp, Passenger Side Taillamp |
| SPARE | Spare |
| SPARE | Spare |
| SPARE | Spare |
| SPARE | Spare |
| SPARE | Spare |
| SPARE | Spare |
| SPARE | Spare |
| V/CHK | Instrument Panel Module-Voltage Check |
| WPR | Wipe/Wash Module Assembly |
| WPR SW/VICS | Rain Sensor, Wiper Switch |
| Relays | Usage |
| A/C CMPRSR CLTCH | Air Conditioning Compressor Clutch |
| ACCY | Accessory Rain Sensor, Headlamp Washer Relay Coil, Windshield Wiper/Washer Module |
| BRK VAC PUMP | Brake Vacuum Pump |
| FAN S/P | Cooling Fan Series/Parallel |
| FOG LAMP | Fog Lamps |
| FRT BLWR | Front Blower Motor |
| FUEL COOL | Fuel Cooling Pump |
| HI BEAM | High Beam Headlamp |
| HI FAN SPD | Cooling Fan High Speed |
| HORN | Horn |
| LO FAN SPD | Cooling Fan Low Speed |
| LOW BEAM W/O HID/HID | Low Beam Headlamp, High Intensity Discharge (HID) |
| PRK LAMP | Parking Lamps, Instrument Panel Dimming, Rear License Plate Lamps |
| PWR/TRN | Engine Controls |
| RUN CRNK | Heated Washer Nozzle, Air Quality, Antilock Brake System, Climate Control Panel, TCM, ECM, Instrument Control Panel, Instrument Control Panel Cluster |
| SPARE | Spare |
| SPARE | Spare |
| SPARE | Spare |
| STRTR | Starter |
| WPR HI | Windshield Wiper High Speed |
| Circuit Breakers | Usage |
| HDLP WASH | Headlamp Washer Motor (Circuit Breaker) |
Rear Underseat Fuse Block
There is a fuse block located under the rear seat on the driver’s side and passenger’s side of the vehicle. The rear seat cushion must be removed to access the fuse blocks.
Driver’s Side
| Fuses | Usage |
| AMP | Amplifier |
| INCLR PUMP | Inner Cooler Pump (Option) |
| THEFT/SHFT | Theft Sensors, Auto Shifter, Power Sounder |
| MRTD MDL | Magnetic Ride Control Module (Option) |
| REAR DR MDL | Rear Door Modules |
| ELC EXH | Electronic Level Control, Exhaust Solenoid (Option) |
| DDM | Driver Door Module, Front Door SubWoofers (Option) |
| TV/VICS/SCM | Infotainment (Export Only), Supervisory Control Module (Option) |
| REAR HTD/SEATS | Rear Heated Seats |
| SPARE | Spare |
| SPARE | Spare |
| IGN3 | Front Passenger Heated Seat, Auto Shifter, Occupant Protection, Electronic Tension Reducer for Seatbelt |
| REAR SHLF SPKR | Rear Shelf Speaker (Option) |
| MSM | Memory Seat Module Lumbar |
| TRUNK RELSE SW | Trunk Release, Valet Lockout Switch |
| BCK/UP LAMP | Reverse Lamps, Rear Parking Aid, Inside Rearview Mirrors |
| AIR BAG/BATT | Airbag |
| POS LAMPS | Rear Taillamps |
| ELC CMPRSR | Automatic Level Control (Option) |
| Relays | Usage |
| INCLR PUMP | Inner Cooler Pump (Option) |
| ELC CMPRSR | Electronic Level Control, Compressor (Option) |
| LT POS | Left Rear Taillamp, Position Lamps (Option) |
| RT POS | Right Rear Taillamp, Position Lamps (Option) |
| RUN | Ignition 3 |
| STDBY LAMP | Rear Taillamps, Position Lamps (Option) |
| TRUNK RELSE | Trunk Release Motor |
| BCK/UP LAMP | Reverse Lamps, Rear Parking Aid, Inside Rearview Mirror |
| Circuit Breakers | Usage |
| PWR SEATS | Power Seats |
| Diodes | Usage |
| SPARE | Spare |
| Joint Connector | Usage |
| J/C | Splice Pack (Green) |
Passenger’s Side
| Fuses | Usage |
| AIRBAG/IGN | Sensing and Diagnostic Monitor, Automatic Occupant Sensor, Passenger Supplemental Inflatable Restraint |
| CNSTR/VENT | Canister Vent Solenoid |
| DIFF PUMP | Rear Differential Pump |
| FRT PDM | Front Passenger Door Module, Right Power Subwoofer |
| FUEL PUMP | Fuel Pump |
| HTD STR | Heated Steering Wheel |
| RF HTD/SEAT/XM | Front Passenger Heated Seat, S-Band™ Antenna |
| RDO/ONSTAR | Radio, OnStar® |
| INT LAMP | Interior Lamps |
| LT TRN/LDW | Left Turn Signal, Lane Departure Warning (Option) |
| REAR DEFOG | Rear Defogger |
| REAR/FOG | Rear Fog Lamps (Option) |
| RIM | Rear Integration Module |
| RIM /RPA /ISRVM /CLM | Rear Integration Module, Rear Parking Aid, Inside Rearview Mirror, Column Lock Module, Power Sounder, Active Front Steering (AFS), Supervisory Control Module |
| RUN/CRNK | UHBEC Run, CRNK Relay Coil, Rear Fog Lamp Relay Coil |
| S/ROOF | Sun Roof Module (Option) |
| SPARE | Spare |
| STOP LAMPS | Stop Lamps |
| RT TRN/SZBA | Right Turn Signal, Side Blind Zone Alert (Option) |
| Relays | Usage |
| DIFF PUMP | Rear Differential Pump (Option) |
| FUEL PUMP | Fuel Pump |
| INT LAMP | Interior Lamps |
| REAR DEFOG | Rear Defogger |
| REAR/FOG | Rear Fog Lamps (Option) |
| RUN/CRNK | Ignition 1 |
| SPARE | Spare |
| STOP LAMP | Stop Lamp |
| Circuit Breakers | Usage |
| WINDOW MTRS | Power Window Motors Circuit Breaker |
| Diodes | Usage |
| TRUNK DIODE | Trunk Release |
| Joint Connector | Usage |
| J/C | Splice Pack (Blue) |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
