Browse Cadillac CTS fuse box diagrams for 2003–2007 models with relay locations, fuse assignments, panel layouts, and electrical system information. This article covers the first-generation Cadillac CTS (Model Code: GMX320) , available from 2003 , and includes fuse box diagrams for Cadillac CTS 2003, 2004, 2005, 2006 and 2007 , along with details about the location of the fuse panels inside the vehicle and a clear explanation of the assignment of each fuse and relay (fuse layout).
The underhood fuse block is located in the engine compartment on the passenger side of the vehicle.
Assignment of the fuses in the engine compartment fuse box
Fuse Data
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Short-Code Type Description RT PARK Mini Passenger’s Side Taillamp Assembly, Front Sidemarker and Front Parking Lamp Assembly HORN Mini Dual Horn Assembly LT HI BEAM Mini Driver’s Side High-Beam Headlamp LT LOW BEAM Mini Driver’s Side Low-Beam Headlamp RT LOW BEAM Mini Passenger’s Side Low-Beam Headlamp RT HI BEAM Mini Passenger’s Side High-Beam Headlamp TOS Mini Manual Transmission Output Speed Sensor SPARE Mini Not Used THEFT Mini ECM (Electronic Control Module), TCM (Transmission Control Module), PASS-Key 111+ Module LT PARK Mini Driver’s Side Taillamp Assembly, Front Sidemarker and Front Parking Lamp Assembly LIC/DIMMING / DIMMING Mini Rear License Plate Assembly, Dash Integrated Module (DIM) DIM/ALDL Mini DIM, ALDL (Assembly Line Data Link) FLASHER Mini Turn Signal / Hazard Flasher Module MANIFOLD Mini Manifold Flaps 1 and 2, Air Mass Meter, Canister Purge Valve STRG CTLS Mini Steering Wheel Control Pad, Headlamp Switch HTR VLV/ CLTCH Mini Heater Valve, Clutch Switch (Normal Closed), Clutch Switch (Normal Open), Jumper to Start Relay Coil for Automatic Transmission WASH NOZ Mini Driver’s and Passenger’s Side Heated Washer Nozzles PRE O2/CAM Mini Driver’s & Passenger’s Side Oxygen Sensors, CAM Phaser, Canister Purge ECM Mini Electronic Control Module TCM/IPC Mini TCM, ECM and IPC (Instrument Panel Cluster) IGN MOD / IGN MOD/MAF Mini Front Bank Ignition Modules ELEC PRNDL Mini Electronic PRNDL TCC/ET Mini TCC / ET Brake Switch (Extended Travel), TCC / ET Brake Switch (Cruise Disable) STOP LP SW Mini Stoplamp Switch IGN SW Mini Ignition Switch (Power to IGN-3 and CRANK) VOLT CHECK Mini DIM (Dash Integration Module) ECM/TCM Mini TCM (Transmission Control Module), ECM (Electronic Control Module), IPC (Instrument Panel Cluster), PASS-Key 111+ Module ODD INJ/COILS Mini Odd Ignition Coils, Fuel Injectors, Odd Injection Coils WPR MOD Mini Windshield Wiper Module Assembly INJ Mini Fuel Injectors COMP CLUTCH Mini Compressor Clutch WPR SW Mini Windshield Wiper / Washer Switch FOG LAMP Mini Fog Lamps OUTLET Mini Center Console Accessory Power Outlet POST O2 Mini Driver’s and Passenger’s Side Oxygen Sensors, LRPDB (Pusher Cooling Fan Relay) I/P OUTLET Mini Instrument Panel Accessory Power Outlet CCP Mini Climate Control EVEN INJ/COILS Mini Even Injection Coils PRE O2 Mini Driver’s and Passenger’s Side Oxygen Sensors, Transmission Output Speed Sensor R REAR J-Case RRPDB (Passenger’s Side Rear Power Distribution Box) L REAR J-Case LRPDB (Driver’s Side Rear Power Distribution Box) HI FAN J-Case High Cooling Fan Motor LO FAN J-Case Low Cooling Fan Motor BLOWER J-Case PWM Fan Motor Assembly STARTER J-Case Starter Solenoid EBCM J-Case Electronic Brake Control Module ABS J-Case Anti-Lock Brake System
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Assignment of the circuit breakers in the engine compartment fuse box
Fuse Data
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Short-Code Description HDLP WASH C/B-OPT Headlamp Washer Motor (Optional)
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Assignment of the harness connectors in the engine compartment fuse box
Fuse Data
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Short-Code Description BODY W/H Wiring Harness Connection I/P W/H Wiring Harness Connection ENG W/H Engine Wiring Harness Connection FORWARD LAMP Forward Lamp Wiring Harness Connection
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Assignment of the relays in the engine compartment fuse box
Fuse Data
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Short-Code Description LO SPEED FAN RELAY MINI Low Speed Fan Motor HI SPEED FAN RELAY MINI High Speed Fan Motor ACCESSORY RELAY MINI Accessory Power Outlets S/ P FAN RELAY MINI Series / Parallel Fan PARK LAMP RELAY MICRO Parking Lamps HORN RELAY MICRO Horn HI BEAM RELAY MICRO High-Beam Headlamps DRL RELAY MICRO-OPT Daytime Running Lamps LO BEAM RELAY/HID MINI-OPT Low-Beam HID Headlamps (Option) HDLP WASH RELAY MINI-OPT Headlamp Washer Motor (Option) CIGAR RELAY MINI Cigarette Lighter (Option) BLOWER RELAY MINI Front Blower FOG LAMP RELAY MICRO Fog Lamps MAIN RELAY MICRO Powertrain / ECM STARTER RELAY MINI Starter Solenoid CMP CLU RELAY MICRO Compressor Clutch IGN-1 RELAY MICRO Ignition Switch (ON)
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There are two fuse boxes, one on the driver side and one on the passenger side, located under the rear underseat. To reach the rear underseat fuse blocks, you must first remove the rear seat cushion.
Assignment of the fuses in the rear underseat fuse box (Driver’s Side)
Fuse Data
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Short-Code Type Description L FRT HTD SEAT MOD Mini Driver’s Heated Seat Module MEM/ADAPT SEAT Mini Driver’s Power Seat Switch, Memory Seat Module TRUNK DR RELEASE Mini Trunk Release Motor REVERSE LAMP Mini ISRVM (Inside Rearview Mirror), License Plate Lamp Assembly SPARE Mini Not Used POSITION LAMP Mini Taillamp Assemblies, Front Position Lamp Assemblies AUDIO Mini Radio, OnStar Module REAR DR MOD Mini Rear Door Modules BAS Mini Taillamps, Center High-Mounted Stoplamp, Flasher Module, ABS Module, Trailer Lamps DRIVER DR MOD Mini Driver’s Door Module HDLP LEVELING Mini Headlamp Leveling System Chassis Sensors (Export Only) EBCM Mini EBCM (Electronic Brake Control Module) CCP Mini CCP (Climate Control Panel) IGN 3 Mini Heated Seat Modules, Air Inlet Motor, Shifter Assembly AMP J-Case Audio Amplifier PUSHER FAN J-Case Pusher Fan (Export Only)
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Assignment of the circuit breakers in the rear underseat fuse box (Driver’s Side)
Fuse Data
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Short-Code Description SEAT C/B Power Seat Switches, Memory Seat Module
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Assignment of the relays in the rear underseat fuse box (Driver’s Side)
Fuse Data
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Short-Code Description BAS RELAY MINI Brake Apply Sensor SPARE Not Used PUSHER FAN Pusher Fan (Export Only) L POSITION RELAY MICRO Driver’s Side Position Lamp R POSITION RELAY MICRO Passenger’s Side Position Lamp IGN 3 RELAY MICRO Heated Seat Modules, Air Inlet Motor, Shifter Assembly STANDING LAMP RLY MICRO Control for Position Lamp Relays TRK DR REL SOL RELAY MICRO Trunk Release Motor REV LAMP RELAY MICRO ISRVM (Inside Rearview Mirror), License Plate Lamp Assembly
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2003-2004
2005-2007
Assignment of the fuses in the rear underseat fuse box (Passenger’s Side)
Fuse Data
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Short-Code Type Description TRUNK DIODE Mini Trunk Lamp INTERIOR LAMP Mini Hush Panel Lamps, Puddle Lamps, Overhead Courtesy Lamp Assembly PSGR DR MOD Mini Right Front Passenger Door Module RIM Mini 2003-2004: RIM (Rear Integration Module), Ignition Switch, Key Lock Cylinder2005-2007: ISRVM (Inside Rearview Mirror), Power Sounder, RIMRIM/IGN SW Mini RIM (Rear Integration Module), Ignition Switch, Key Lock Cylinder REAR FOG LAMP Mini Rear Fog Lamps (Export Only) SPARE Mini Not Used NAV Mini TV Tuner Assembly (Export Only), VICS (Vehicle Information Communication System) Module (Export Only) AIR BAG Mini SDM (Sensing Diagnostic Module) SPARE Mini Not Used POWER SOUNDER Mini Power Sounder, Inclination Sensor ABS Mini Anti-Lock Brake System TRUNK LAMP Mini Trunk Lamp FUEL PUMP MTR Mini Fuel Pump Motor AFTERBOIL Mini Afterboil Heater Pump R FRT HTD SEAT MOD Mini Passenger’s Side Heated Seat Module SPARE Mini Not Used SIR Mini SDM (Sensing Diagnostic Module) RIM Mini ISRVM (Inside Rearview Mirror), Power Sounder, RIM, Passive Trunk Release Sensor CANISTER VENT Mini Canister Vent Solenoid SPARE Mini Not Used REAR DEFOG J-Case Rear Window Defogger Element SUNROOF MOD J-Case Power Sunroof Module
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Assignment of the circuit breakers in the rear underseat fuse box (Passenger’s Side)
Fuse Data
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Short-Code Description DR MOD PWR C/B Door Modules
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Assignment of the relays in the rear underseat fuse box (Passenger’s Side)
Fuse Data
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Short-Code Description RAP RELAY MINI Retained Accessory Power SPARE Not Used REAR DEFOG RELAY MINI Rear Window Defogger SPARE Not Used AFTER BOIL MICRO Afterboil Heater Pump INT LAMP RELAY MICRO Hush Panel Lamps, Puddle Lamps, Overhead Courtesy Lamp Assembly IGN 1 RELAY MICRO Ignition Switch REAR FOG LAMP RLY MICRO Rear Fog Lamps (Export Only) FUEL PUMP MOTOR RLY MICRO Fuel Pump Motor
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