Cadillac CTS mk1 (First Generation; 2003) – fuse box diagram

Cadillac CTS mk1 (First Generation; 2003) – fuse box diagram

Year of production: 2003

Underhood Fuse Block

The underhood fuse block is located in the engine compartment on the passenger’s side of the vehicle.

Cadillac CTS mk1 - fuse box - engine compartment
Cadillac CTS mk1 – fuse box – engine compartment
Relays Usage
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)

 

Wiring Harnesses Usage
BODY W/H Wiring Harness Connection
BODY W/H Wiring Harness Connection
ENG W/H Engine Wiring Harness Connection

 

J Cases Usage
R REAR RRPDB (Passenger’s Side Rear Power Distribution Box)
R REAR RRPDB (Passenger’s Side Rear Power Distribution Box)
L REAR LRPDB (Driver’s Side Rear Power Distribution Box)
L REAR LRPDB (Driver’s 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

 

Mini Fuses Usage
RT PARK Passenger’s Side Taillamp Assembly, Front Sidemarker and Front Parking Lamp Assembly
HORN Dual Horn Assembly
LT HI BEAM Driver’s Side High-Beam Headlamp
LT LOW BEAM Driver’s Side Low-Beam Headlamp
RT LOW BEAM Passenger’s Side Low-Beam Headlamp
RT HI BEAM Passenger’s 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 Driver’s 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 Driver’s and Passenger’s Side Heated Washer Nozzles
ECM Electronic Control Module
TCM/IPC TCM, ECM and IPC (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-3 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 Driver’s and Passenger’s Side Oxygen Sensors, LRPDB (Pusher Cooling Fan Relay)
I/P OUTLET Instrument Panel Accessory Power Outlet
CCP Climate Control Panel
PRE 02 Driver’s and Passenger’s Side Oxygen Sensors, Transmission Output Speed Sensor
SPARE Not Used
SPARE Not Used
SPARE Not Used

 

Circuit Breakers Usage
HDLP WASH C/B – OPT Headlamp Washer Motor (Option)

 

Rear Underseat Fuse Block (Driver’s Side)

The driver’s side rear fuse block is located under the rear seat on the driver’s side of the vehicle. The rear seat cushion must be removed to access the rear fuse block.

Cadillac CTS mk1 - fuse box - rear udnerseat (driver's side)
Cadillac CTS mk1 – fuse box – rear udnerseat (driver’s side)
Relay Usage
SPARE Not Used
SPARE Not Used
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

 

Minifuses Usage
L FRT HTD SEAT MOD Driver’s Heated Seat Module
MEM/ADAPT SEAT Driver’s Power Seat Switch, Memory Seat Module
TRUNK DR 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 Driver’s 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

 

J Cases Usage
AMP Audio Amplifier
PUSHER FAN Pusher Fan (Export Only)

 

Circuit Breakers Usage
SEAT C/B Power Seat Switches, Memory Seat Module

 

Rear Underseat Fuse Block (Passenger’s Side)

The passenger’s side rear fuse block is located under the rear seat on the passenger’s side of the vehicle. The rear seat cushion must be removed to access the rear fuse block.

Cadillac CTS mk1 - fuse box - rear udnerseat (passenger's side)
Cadillac CTS mk1 – fuse box – rear udnerseat (passenger’s side)
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
REAR 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
POWER SOUNDER Power Sounder, Inclination Sensor
SPARE Not Used
TRUNK LAMP Trunk Lamp
FUEL PUMP MTR Fuel Pump Motor
AFTERBOIL Afterboil Heater Pump
R FRT HTD SEAT MOD Passenger’s Side Heated Seat Module
SPARE Not Used
SIR SDM (Sensing Diagnostic Module)
RIM ISRVM (Inside Rearview Mirror), Power Sounder, RIM, Passive Trunk Release Sensor
CANISTER VENT Canister Vent Solenoid
SPARE Not Used

 

Circuit Breakers Usage
DR MOD PWR C/B Door Modules

 

J Cases Usage
REAR DEFOG Rear Window Defogger Element
SUNROOF MOD Power Sunroof Module

 

Relays Usage
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

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.