Jonathan Yarden Mar 25, 2021 · 5 min. read
In this article you will find a description of fuses and relays Cadillac,
with photos of block diagrams and their locations.
Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.
Year of production: 2003
Underhood Fuse Block
The underhood fuse block is located in the engine compartment on the passengerâs side of the vehicle.
| Relays | Usage |
| LO SPEED FANÂ RELAY MINI | Low Speed Fan Motor |
| HI SPEED FANÂ RELAY MINI | High Speed Fan Motor |
| ACCESSORYÂ RELAY MINI | Accessory Power Outlets |
| S/P FANÂ RELAY MINI | Series/Parallel Fan |
| PARK LAMPÂ RELAY MICRO | Parking Lamps |
| HORN RELAYÂ MICRO | Horn |
| HI BEAMÂ RELAY MICRO | High-Beam Headlamps |
| DRL RELAYÂ MICRO â OPT | Daytime Running Lamps |
| LO BEAM RELAY/HID MINI â OPT | Low-Beam HID Headlamps (Option) |
| HDLP WASHÂ RELAYÂ MINI â OPT | Headlamp Washer Motor (Option) |
| CIGARÂ RELAY MINI | Cigarette Lighter (Option) |
| BLOWERÂ RELAY MINI | Front Blower |
| FOG LAMPÂ RELAY MICRO | Fog Lamps |
| MAIN RELAYÂ MICRO | Powertrain/ECM |
| STARTERÂ RELAY MINI | Starter Solenoid |
| CMP CLUÂ RELAY MICRO | Compressor Clutch |
| IGN-1 RELAYÂ MICRO | Ignition Switch (ON) |
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| Wiring Harnesses | Usage |
| BODY W/H | Wiring Harness Connection |
| BODY W/H | Wiring Harness Connection |
| ENG W/H | Engine Wiring Harness Connection |
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| J Cases | Usage |
| R REAR | RRPDB (Passengerâs Side Rear Power Distribution Box) |
| R REAR | RRPDB (Passengerâs Side Rear Power Distribution Box) |
| L REAR | LRPDB (Driverâs Side Rear Power Distribution Box) |
| L REAR | LRPDB (Driverâs Side Rear Power Distribution Box) |
| HI FAN | High Cooling Fan Motor |
| LO FAN | Low Cooling Fan Motor |
| BLOWER | PWM Fan Motor Assembly |
| STARTER | Starter Solenoid |
| EBCM | Electronic Brake Control Module |
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| Mini Fuses | Usage |
| RT PARK | Passengerâs Side Taillamp Assembly, Front Sidemarker and Front Parking Lamp Assembly |
| HORN | Dual Horn Assembly |
| LT HI BEAM | Driverâs Side High-Beam Headlamp |
| LT LOW BEAM | Driverâs Side Low-Beam Headlamp |
| RT LOW BEAM | Passengerâs Side Low-Beam Headlamp |
| RT HI BEAM | Passengerâs Side High-Beam Headlamp |
| SPARE | Not Used |
| SPARE | Not Used |
| THEFT | ECM (Electronic Control Module), TCM (Transmission Control Module), PASS-Key III+ Module |
| LT PARK | Driverâs Side Taillamp Assembly, Front Sidemarker and Front Parking Lamp Assembly |
| LIC/DIMMING | Rear License Plate Assembly, DIM |
| DIM/ALDL | DIM, ALDL (Assembly Line Data Link) |
| FLASHER | Turn Signal/Hazard Flasher Module |
| MANIFOLD | Manifold Flaps 1 and 2, Air Mass Meter, Canister Purge Valve |
| STRG CTLS | Steering Wheel Control Pad, Headlamp Switch |
| HTR VLV/CLTCH | Heater Valve, Clutch Switch (Normal Closed), Clutch Switch (Normal Open), Jumper to Start Relay Coil for Automatic Transmission |
| WASH NOZ | Driverâs and Passengerâs Side Heated Washer Nozzles |
| ECM | Electronic Control Module |
| TCM/IPC | TCM, ECM and IPCÂ (Instrument Panel Cluster) |
| SPARE | Not Used |
| IGN MOD | Front Bank Ignition Modules |
| ELEC PRNDL | Electronic PRNDL |
| TCC/ET | TCC/ET Brake Switch (Extended Travel), TCC/ET Brake Switch (Cruise Disable) |
| STOP LP SW | Stop Lamp Switch |
| IGN SW | Ignition Switch (Power to IGN-3Â and CRANK) |
| VOLT CHECK | DIM (Dash Integration Module) |
| ECM/TCM | TCM (Transmission Control Module), ECM (Electronic Control Module), IPC (Instrument Panel Cluster), PASS-Key III+ Module |
| WPR MOD | Windshield Wiper Module Assembly |
| INJ | Fuel Injectors |
| COMP CLUTCH |
Compressor Clutch |
| WPR SW | Windshield Wiper/Washer Switch |
| FOG LAMP | Fog Lamps |
| OUTLET | Center Console Accessory Power Outlet |
| POST 02 | Driverâs and Passengerâs Side Oxygen Sensors, LRPDB (Pusher Cooling Fan Relay) |
| I/P OUTLET | Instrument Panel Accessory Power Outlet |
| CCP | Climate Control Panel |
| PRE 02 | Driverâs and Passengerâs Side Oxygen Sensors, Transmission Output Speed Sensor |
| SPARE | Not Used |
| SPARE | Not Used |
| SPARE | Not Used |
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| Circuit Breakers | Usage |
| HDLP WASHÂ C/B â OPT | Headlamp Washer Motor (Option) |
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Rear Underseat Fuse Block (Driverâs Side)
The driverâs side rear fuse block is located under the rear seat on the driverâs side of the vehicle. The rear seat cushion must be removed to access the rear fuse block.
| Relay | Usage |
| SPARE | Not Used |
| SPARE | Not Used |
| SPARE | Not Used |
| PUSHER FAN | Pusher Fan (Export Only) |
| L POSITIONÂ RELAY MICRO | Driverâs Side Position Lamp |
| R POSITIONÂ RELAY MICRO | Passengerâs Side Position Lamp |
| IGN 3 RELAY MICRO | Heated Seat Modules, Air Inlet Motor, Shifter Assembly |
| STANDINGÂ LAMP RLYÂ MICRO | Control for Position Lamp Relays |
| TRK DR RELÂ SOL RELAYÂ MICRO | Trunk Release Motor |
| REV LAMP RELAY MICRO | ISRVM (Inside Rearview Mirror), License Plate Lamp Assembly |
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| Minifuses | Usage |
| L FRT HTDÂ SEAT MOD | Driverâs Heated Seat Module |
| MEM/ADAPT SEAT | Driverâs Power Seat Switch, Memory Seat Module |
| TRUNK DRÂ RELEASE | Trunk Release Motor |
| REVERSE LAMP | ISRVM (Inside Rearview Mirror), License Plate Lamp Assembly |
| SPARE | Not Used |
| POSITION LAMP | Taillamp Assemblies, Front Position Lamp Assemblies |
| SPARE | Not Used |
| SPARE | Not Used |
| AUDIO | Radio, OnStar Module |
| SPARE | Not Used |
| REAR DR MOD | Rear Door Modules |
| SPARE | Not Used |
| DRIVER DR MOD | Driverâs Door Module |
| SPARE | Not Used |
| HDLP LEVELING | Headlamp Leveling System Chassis Sensors (Export Only) |
| EBCM | EBCM (Electronic Brake Control Module) |
| CCP | CCP (Climate Control Panel) |
| IGN 3 | Heated Seat Modules, Air Inlet Motor, Shifter Assembly |
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| J Cases | Usage |
| AMP | Audio Amplifier |
| PUSHER FAN | Pusher Fan (Export Only) |
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| Circuit Breakers | Usage |
| SEAT C/B | Power Seat Switches, Memory Seat Module |
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Rear Underseat Fuse Block (Passengerâs Side)
The passengerâs side rear fuse block is located under the rear seat on the passengerâs side of the vehicle. The rear seat cushion must be removed to access the rear fuse block.
| Minifuses | Usage |
| INTERIOR LAMP | Hush Panel Lamps, Puddle Lamps, Overhead Courtesy Lamp Assembly |
| PSGR DR MOD | Right Front Passenger Door Module |
| RIM | RIM (Rear Integration Module), Ignition Switch, Key Lock Cylinder |
| REARÂ FOG LAMP | Rear Fog Lamps (Export Only) |
| SPARE | Not Used |
| NAV | TV Tuner Assembly (Export Only), VICS (Vehicle Information Communication System) Module |
| SPARE | Not Used |
| SPARE | Not Used |
| POWERÂ SOUNDER | Power Sounder, Inclination Sensor |
| SPARE | Not Used |
| TRUNK LAMP | Trunk Lamp |
| FUELÂ PUMP MTR | Fuel Pump Motor |
| AFTERBOIL | Afterboil Heater Pump |
| R FRT HTD SEAT MOD | Passengerâs Side Heated Seat Module |
| SPARE | Not Used |
| SIR | SDM (Sensing Diagnostic Module) |
| RIM | ISRVM (Inside Rearview Mirror), Power Sounder, RIM, Passive Trunk Release Sensor |
| CANISTERÂ VENT | Canister Vent Solenoid |
| SPARE | Not Used |
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| Circuit Breakers | Usage |
| DR MODÂ PWR C/B | Door Modules |
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| J Cases | Usage |
| REAR DEFOG | Rear Window Defogger Element |
| SUNROOFÂ MOD | Power Sunroof Module |
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| Relays | Usage |
| RAPÂ RELAY MINI | Retained Accessory Power |
| SPARE | Not Used |
| REAR DEFOGÂ RELAY MINI | Rear Window Defogger |
| SPARE | Not Used |
| AFTERÂ BOIL MICRO | Afterboil Heater Pump |
| INT LAMP RELAY MICRO | Hush Panel Lamps, Puddle Lamps, Overhead Courtesy Lamp Assembly |
| IGN 1 RELAYÂ MICRO | Ignition Switch |
| REAR FOGÂ LAMP RLYÂ MICRO | Rear Fog Lamps (Export Only) |
| FUEL PUMPÂ MOTOR RLYÂ MICRO | Fuel Pump Motor |
WARNING:Â Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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