Cadillac CTS (2003-2007) fuses and relays

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In this article, we consider the first-generation Cadillac CTS, produced from 2003 to 2007. Here you will find fuse box diagrams of Cadillac CTS 2003, 2004, 2005, 2006 and 2007, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

See other Cadillac CTS:

Cadillac CTS (2008-2014)…>>

Cadillac CTS (2014-2018-..)…>>

Fuse Layout Cadillac CTS 2003-2007

Cigar lighter / power outlet fuses in the Cadillac CTS are located in the Engine compartment fuse box (see fuses “OUTLET” (Center Console Accessory Power Outlet) and “I/P OUTLET” (Instrument Panel Accessory Power Outlet)).

Table of Contents

Fuse Box in the engine compartment

Fuse Box Location

Fuse box diagram

2003-2004

2005-2007

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Assignment of the fuses and relays in the engine compartment

Name	Description
Fuses
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
TOS	Manual Transmission Output Speed Sensor
SPARE	Not Used
THEFT	ECM (Electronic Control Module), TCM (Transmission Control Module), PASS-Key 111+ Module
LT PARK	Driver’s Side Taillamp Assembly, Front Sidemarker and Front Parking Lamp Assembly
LIC/DIMMING / DIMMING	Rear License Plate Assembly, Dash Integrated Module (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
PRE O2/CAM	Driver’s & Passenger’s Side Oxygen Sensors, CAM Phaser, Canister Purge
ECM	Electronic Control Module
TCM/IPC	TCM, ECM and IPC (Instrument Panel Cluster)
IGN MOD / IGN MOD/MAF	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	Stoplamp 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 111+ Module
ODD INJ/COILS	Odd Ignition Coils, Fuel Injectors, Odd Injection Coils
WPR MOD	Windshield Wiper Module Assembly
INJ	Fuel Injectors
COMP CLUTCH	Compressor Clutch
WPR SW	Windshield WiperA/Vasher Switch
FOG LAMP	Fog Lamps
OUTLET	Center Console Accessory Power Outlet
POST O2	Driver’s and Passenger’s Side Oxygen Sensors, LRPDB (Pusher Cooling Fan Relay)
I/P OUTLET	Instrument Panel Accessory Power Outlet
CCP	Climate Control
EVEN INJ/COILS	Even Injection Coils
PRE O2	Driver’s and Passenger’s Side Oxygen Sensors, Transmission Output Speed Sensor

Circuit Breakers
HDLP WASH C/B-OPT	Headlamp Washer Motor (Optional)

J-Case fuses
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
ABS	Anti-Lock Brake System

Wiring Harnesses
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

Relays
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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Passenger compartment

Fuse Box Location

Two fuse boxes are located under the rear seat.

To remove the rear seat cushion, do the following:

Pull up on the front of the cushion to release the front hooks;
Pull the cushion up and out toward the front of the vehicle;
Slide the cushion out one of the rear doors and set it aside.

Fuse box diagram (Driver’s Side)

Assignment of the fuses and relays in the Rear Underseat Fuse Block (Driver’s Side)

Name	Description
Fuses
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
AUDIO	Radio, OnStar Module
REAR DR MOD	Rear Door Modules
BAS	Taillamps, Center High-Mounted Stoplamp, Flasher Module, ABS Module, Trailer Lamps
DRIVER DR MOD	Driver’s Door Module
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-case fuses
AMP	Audio Amplifier
PUSHER FAN	Pusher Fan (Export Only)

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

Relays
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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Fuse box diagram (Passenger’s Side)

2003-2004

2005-2007

Assignment of the fuses and relays in the Rear Underseat Fuse Block (Passenger’s Side)

Name	Description
Fuses
TRUNK DIODE	Trunk Lamp
INTERIOR LAMP	Hush Panel Lamps, Puddle Lamps, Overhead Courtesy Lamp Assembly
PSGR DR MOD	Right Front Passenger Door Module
RIM	2003-2004: RIM (Rear Integration Module), Ignition Switch, Key Lock Cylinder 2005-2007: ISRVM (Inside Rearview Mirror), Power Sounder, RIM
RIM/IGN SW	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 (Export Only)
AIR BAG	SDM (Sensing Diagnostic Module)
SPARE	Not Used
POWER SOUNDER	Power Sounder, Inclination Sensor
ABS	Anti-Lock Brake System
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
DR MOD PWR C/B	Door Modules

J-Case fuses
REAR DEFOG	Rear Window Defogger Element
SUNROOF MOD	Power Sunroof Module

Relays
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

Learn more:

How to check the fuses?

How to replace a blown fuse?

Why do car fuses blow?

Types of automotive fuses

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