Chevrolet Impala 2003 - 2003 GENERAL MOTORS Impala & Monte Carlo

Chevrolet Impala 2003 - BUZZERS, RELAYS & TIMERS

Chevrolet Impala 2003 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C RLY	On top side of junction block.
AIR Relay	On top side of underhood electrical center.
Back-Up Lamp Relay	On top side of right instrument panel fuse block.
Battery Run Down Protection Relay	On top side of right instrument panel fuse block.
Crank Relay	On top side of underhood electrical center.
Daytime Running Light Relay	On top side of underhood electrical center.
Fan Control No. 1 Relay	On bottom side of underhood electrical center.
Fan Control No. 2 Relay	On bottom side of underhood electrical center.
Fan Control No. 3 Relay	On bottom side of underhood electrical center.
Foglight Relay	On top side of underhood electrical center.
Fuel Pump Relay	On top side of underhood electrical center.
Hazard Lamp/Turn Signal Lamp Flasher	Integral to hazard switch, left center of instrument panel.
Headlamp Relay	On top side of left instrument panel fuse block.
Heated Seat Relay	Below respective seat.
Horn Relay	On top side of underhood electrical center.
Ignition Relay	On bottom side of underhood electrical center.
Luggage Compartment Lid Lamp Relay	On top side of underhood accessory wiring junction block.
Park Lamp Relay	On top side of right instrument panel fuse block.
Rear Defogger Relay	On top side of right instrument panel fuse block.
Retained Accessory Power Relay	On top side of left instrument panel fuse block.

Chevrolet Impala 2003 - CIRCUIT PROTECTION DEVICES

Chevrolet Impala 2003 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Engine Wiring Harness Junction Block	In right side of engine compartment, forward of strut tower.
Fuse Block (SEO)	Behind dash, right of steering column.
Fusible Links (Starter)	Front of engine, on starter solenoid. See Fig. 2.
Fusible Links (Underhood Junction Block)	At underhood accessory wiring junction block.
Instrument Panel Electrical Center (Left)	End of dash, in left door opening.
Instrument Panel Electrical Center (Right)	End of dash, in right door opening.
I/P Junction Block (Left)	Left side of dash, behind access panel.
I/P Junction Block (Right)	Right side of dash, behind access panel.
Power Seats Circuit Breaker	On bottom side of right instrument panel fuse block.
Rear Defogger Circuit Breaker	On bottom side of right instrument panel fuse block.
Rear Junction Block	Behind right rear wheelwell. See Fig. 5.
Retained Accessory Power Breaker	On bottom side of left instrument panel fuse block.
Underhood Electrical Center	On front of right strut tower.
Underhood Junction Block (Bottom)	On front of right strut tower.
Underhood Junction Block (Top)	On front of right strut tower.

Chevrolet Impala 2003 - CONTROL UNITS

Chevrolet Impala 2003 CONTROL UNITS LOCATION

Component	Location
Body Control Module	Behind left side of dash, above parking brake lever.
Coolant Level Module	On right side of radiator.
Cruise Control Module	On left strut tower. See Fig. 6.
Driver Information Display Control Module	In front center of roof.
Electronic Brake Control Module (EBCM)	In left rear of engine compartment, on ABS hydraulic modulator. See Fig. 6.
Heated Seat Control Module	Below respective seat.
HVAC Control Module	Center of dash.
Ignition Control Module (ICM) (3.4L VIN E)	On top right side of engine.
Ignition Control Module (ICM) (3.8L VIN K)	On left front of engine. See Fig. 4.
Inflatable Restraint I/P Module	On right side of dash, above glove box.
Inflatable Restraint Sensing & Diagnostic Module	Below passenger's seat.
Inflatable Restraint Side Impact Module (Left)	On left side of driver's seat back.
Inflatable Restraint Side Impact Module (Right)	On right side of passenger's seat back.
Inflatable Restraint Steering Wheel Module	In center of steering wheel.
Powertrain Control Module	In air cleaner box.
Radio Antenna Module	On upper portion of left "C" pillar.
Remote Control Door Lock Receiver	On upper center of dash.
Sun Roof Module	In roof, near windshield.
Vehicle Communication Interface Module	In rear compartment, mounted to rear of left rear wheelwell.

Chevrolet Impala 2003 - MOTORS

Chevrolet Impala 2003 MOTORS LOCATION

Component	Location
Air Temperature Actuator (Left)	On left side of heater-A/C assembly.
Air Temperature Actuator (Right)	On right side of heater-A/C assembly.
Blower Motor	On right bottom of heater-A/C assembly.
Engine Coolant Fan Motor No. 1	Behind right side of radiator.
Engine Coolant Fan Motor No. 2	Behind left side of radiator.
Fuel Pump & Sender Assembly	In fuel tank.
Secondary Air Injection Reaction Pump	In left front of engine compartment.
Sun Roof Motor	At center left of windshield header.
Washer Fluid Pump	In windshield washer fluid reservoir.
Wiper Motor	On left side of firewall, in engine compartment.

Chevrolet Impala 2003 - SENDING UNITS & SENSORS

Chevrolet Impala 2003 SENDING UNITS & SENSORS LOCATION

Component	Location
A/C Refrigerant Pressure Sensor	On left side of engine compartment, on liquid line.
Ambient Air Temperature Sensor	Front of radiator support.
Ambient Light Sensor	Top right of dash, near defogger outlet.
Automatic Transaxle Fluid Temperature Sensor	In automatic transaxle.
Automatic Transaxle Input Shaft Speed Sensor	In automatic transaxle.
Camshaft Position (CMP) Sensor (3.4L VIN E)	On left front of engine, below intake plenum. See Fig. 2.
Camshaft Position (CMP) Sensor (3.8L VIN K)	On front of engine, above crankshaft pulley.
Crankshaft Position (CKP) Sensor (3.8L VIN K)	At end of crankshaft, behind harmonic balancer.
Crankshaft Position (CKP) Sensor A (3.4L VIN E)	At end of crankshaft, behind harmonic balancer. See Fig. 2.
Crankshaft Position (CKP) Sensor B (3.4L VIN E)	Lower right side of engine. See Fig. 1.
Daytime Running Lamp Ambient Light Sensor	On top right side of dash.
Engine Coolant Temperature (ECT) Sensor (3.4L VIN E)	Near coolant outlet, on left rear of engine.
Engine Coolant Temperature (ECT) Sensor (3.8L VIN K)	Below coolant outlet, on left rear of engine. See Fig. 4.
Engine Oil Level Sensor (3.4L VIN E)	On front center of oil pan. See Fig. 1.
Engine Oil Pressure Sensor (3.8L VIN K)	Near oil filter. See Fig. 3.
Fuel Level Sensor	In fuel tank.
Fuel Tank Pressure Sensor	On top of fuel pump & sender assembly.
Heated Oxygen Sensor No. 1 (3.4L VIN E)	In exhaust manifold, rear of engine compartment.
Heated Oxygen Sensor No. 1 (3.8L VIN K)	In exhaust manifold, rear of engine compartment.
Heated Oxygen Sensor No. 2 (3.4L VIN E)	In exhaust system, behind catalytic converter.
Heated Oxygen Sensor No. 2 (3.8L VIN K)	In exhaust system, behind catalytic converter.
Inflatable Restraint Front End Discriminating Sensor	Top front of radiator support.
Inflatable Restraint Side Impact Sensor (Left) (Impala)	On left "B" pillar.
Inflatable Restraint Side Impact Sensor (Left) (Monte Carlo)	In driver's door.
Intake Air Temperature Sensor	In air intake duct.
Knock Sensor (3.4L VIN E)	Left side of engine, near starter. See Fig. 2.
Knock Sensor (KS) 1 (Bank 1) (3.8L VIN K)	On lower left side of engine, near starter.
Knock Sensor (KS) 2 (Bank 2) (3.8L VIN K)	On lower right side of engine, below exhaust manifold. See Fig. 3.
Manifold Absolute Pressure (MAP) Sensor (3.4L VIN E)	On right rear of intake plenum. See Fig. 2.
Manifold Absolute Pressure (MAP) Sensor (3.8L VIN K)	On top front of engine, on intake plenum.
Mass Airflow Sensor (MAF) (3.4L VIN E)	In air intake plenum.
Mass Airflow Sensor (MAF) (3.8L VIN K)	On top of throttle body. See Fig. 4.
Passlock Sensor	Part of ignition switch.
Power Steering Pressure Sensor (3.4L VIN E)	On steering rack.
Power Steering Pressure Sensor (3.8L VIN K)	On steering rack. See Fig. 3.
Remote Compass Sensor	Integral to headliner console, left front of driver information center.
Throttle Position Sensor (TPS) (3.4L VIN E)	On throttle body assembly. See Fig. 2.
Throttle Position Sensor (TPS) (3.8L VIN K)	On throttle body assembly. See Fig. 4.
Transmission Fluid Temperature (TFT) Sensor	In automatic transaxle.
Vehicle Speed Sensor (VSS) (3.4L VIN E)	On right rear of engine compartment, end of transaxle. See Fig. 1.
Vehicle Speed Sensor (VSS) (3.8L VIN K)	On right rear of engine compartment, end of transaxle. See Fig. 3.
Wheel Speed Sensors (4)	Behind each wheel hub.

Chevrolet Impala 2003 - SOLENOIDS & SOLENOID VALVES

Chevrolet Impala 2003 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
A/T Shift Lock Control Solenoid (Column Shift)	In steering column.
A/T Shift Lock Control Solenoid (Console Shift)	In center console.
Evaporative Emissions (EVAP) Canister Purge Solenoid (3.4L VIN E)	On top rear of engine, on intake manifold, below ignition coil. See Fig. 2.
Evaporative Emissions (EVAP) Canister Purge Solenoid (3.8L VIN K)	On top front of engine, near center of upper intake plenum.
Evaporative Emissions (EVAP) Canister Vent Solenoid	Behind left rear splash shield, in wheelwell.
Exhaust Gas Recirculation (EGR) Valve (3.4L VIN E)	On top rear of engine. See Fig. 2.
Exhaust Gas Recirculation (EGR) Valve (3.8L VIN K)	On top right rear of engine. See Fig. 4.
Idle Air Control (IAC) Valve (3.4L VIN E)	On throttle body. See Fig. 2.
Idle Air Control (IAC) Valve (3.8L VIN K)	On throttle body. See Fig. 4.
Luggage Compartment Lid Lock Release Solenoid	On center of luggage compartment lid.
Pressure Control Solenoid Valve	In automatic transaxle.
Secondary Air Injection (AIR) Shutoff Valve (3.4L VIN E)	On top front of engine.
Secondary Air Injection (AIR) Shutoff Valve (3.8L VIN K)	On rear of engine, in exhaust manifold.
Torque Converter Clutch Solenoid Valve	In transaxle valve body.
1-2 Shift Solenoid Valve	In automatic transaxle.
2-3 Shift Solenoid Valve	In automatic transaxle.

Chevrolet Impala 2003 - SWITCHES

Chevrolet Impala 2003 SWITCHES LOCATION

Component	Location
A/C Pressure Switch	On A/C line, lower left front of engine compartment. See Fig. 6.
Automatic Transaxle Fluid Pressure Manual Valve Position Switch	In automatic transaxle.
Brake Fluid Level Switch	In master cylinder reservoir.
Cruise Control Release Switch	Behind left side of dash, on brake pedal support.
Engine Oil Level Switch (3.4L VIN E)	Front center of oil pan.
Engine Oil Level Switch (3.8L VIN K)	Left center of oil pan.
Engine Oil Pressure (EOP) Switch (3.4L VIN E)	On left side of engine, above starter. See Fig. 2.
Engine Oil Pressure (EOP) Switch (3.8L VIN K)	Right front of engine, below power steering pump.
Park Brake Switch	At base of parking brake assembly.
Stoplamp Switch	On brake pedal support.
Sun Roof Opening Position Switch	Above sun roof motor.
Transmission Internal Mode Switch	Inside automatic transaxle.
Windshield Washer Fluid Level Switch	In washer fluid reservoir.

Chevrolet Impala 2003 - MISCELLANEOUS

Chevrolet Impala 2003 MISCELLANEOUS LOCATION

Component	Location
A/C Compressor Clutch Diode	In wiring harness, 10 cm from A/C compressor clutch.
Audio Amplifier	In luggage compartment, beneath center of rear package shelf.
Blower Motor Resistor Assembly	On HVAC module, below blower motor.
Data Link Connector	Below left side of dash, right of steering column.
Digital Radio Receiver	In rear compartment, mounted to rear of right rear wheelwell.
Navigation Antenna	In passenger compartment, under left center of package shelf trim.

Chevrolet Impala 2003 - CONNECTORS

Chevrolet Impala 2003 CONNECTORS LOCATION

Component	Location
C101 (Gray, 20 Pin)	On left rear of engine compartment, near strut tower. See Fig. 6.
C102 (Black, 16 Pin)	On right rear of engine compartment, near generator. See Fig. 2.
C106 (Black, 30 Pin)	On right center of engine compartment.
C110 (Black, 8 Pin)	On left top of engine, above fuel injector No. 3. See Fig. 4.
C112 (Black, 24 Pin)	On right front of engine compartment.
C113 (20 Pin)	On left top of transaxle housing. See Fig. 6.
C125 (Black, 1 Pin)	On left rear corner of power steering pump.
C126 (Gray, 2 Pin)	Top center of engine, near fuel injector No. 5.
C201 (Black, 40 Pin)	Behind dash, on right side of steering column.
C205 (1 Pin)	Below left side of dash.
C209 (Black, 1 Pin)	Near blower motor.
C216 (Yellow, 4 Pin)	Forward of dash inflator module.
C217 (Yellow, 4 Pin)	Behind left side of dash, near left dash junction block.
C218 (Yellow, 4 Pin)	Behind right side of dash, near right dash junction block.
C225 (Yellow, 6 Pin)	Behind right side of dash, near right dash junction block.
C240 (Black, 8 Pin)	Behind center of dash, left of radio.
C255 (Black, 2 Pin)	Behind dash, near blower motor.
C297 (Gray, 6 Pin)	Near blower motor.
C299A (Blue, 8 Pin)	Near blower motor.
C299B (Blue, 8 Pin)	Near blower motor.
C301 (Black, 40 Pin)	On left "A" pillar.
C302 (Black, 40 Pin)	On right "A" pillar.
C306 (Black, 3 Pin)	Taped to I/P wiring harness, near C302.
C308 (Black, 2 Pin)	Taped to I/P wiring harness, near C302.
C311 (Black, 8 Pin)	Below driver seat.
C312 (Black, 8 Pin)	Below passenger front seat.
C315 (Black, 8 Pin)	In center console, behind transaxle position selector.
C317 (Black, 2 Pin)	Center of passenger compartment, behind transaxle position selector.
C355 (Natural, 7 Pin)	On left "B" pillar.
C356 (Natural, 7 Pin)	On right "B" pillar.
C373 (Black, 16 Pin)	On right "C" pillar.
C392 (Black, 8 Pin)	On left "C" pillar.
C393	On left "C" pillar.
C395	Under left side of package shelf trim.
C400 (Black, 8 Pin)	In rear compartment, above right rear wheelwell. See Fig. 5.
C405 (Gray, 12 Pin)	In rear compartment, right of spare tire well.
C409 (Black, 2 Pin)	In rear compartment, above right rear wheelwell.
C420 (Black, 9 Pin)	In rear compartment, on occupant sensor.
C430 (Gray, 6 Pin)	In rear compartment, above right rear wheelwell. See Fig. 5.
C435 (Black, 8 Pin)	On right "C" pillar.
C440 (Black, 8 Pin)	In rear compartment, above right rear wheelwell.
C901 (Black, 4 Pin)	Near center high mounted stoplamp.

Chevrolet Impala 2003 - GROUNDS

Chevrolet Impala 2003 GROUNDS LOCATION

Component	Location
G100	Negative battery cable, on top of right frame rail.
G101	Top left front of radiator support.
G111	Top right of engine, below ignition control module.
G113	On transaxle stud, near starter.
G117	On transaxle stud, above G113.
G151	On top of left frame rail. See Fig. 6.
G171	On top of left frame rail, forward of left front strut tower.
G201	Under dash, to right of steering column.
G202	Under dash, in center.
G203	Under dash, to right of steering column.
G301	Below driver door opening, rear of left "A" pillar.
G302	Below passenger front door opening, rear of right "A" pillar.
G309	On right "C" pillar.

Chevrolet Impala 2003 - SPLICES

Chevrolet Impala 2003 SPLICES LOCATION

Component	Location
S106 (3.4L VIN E)	Engine wiring harness, on left side of engine compartment, 4 cm from powertrain control module connectors breakout.
S106 (3.8L VIN K)	Engine wiring harness, near breakout to throttle position sensor. See Fig. 4.
S109 (3.4L VIN E)	Fuel injector jumper harness, midway between fuel injector No. 1 breakout & fuel injector No. 2 breakout.
S109 (3.8L VIN K)	Engine wiring harness, top of engine, at intake air temperature sensor breakout.
S114	Forward lamp wiring harness, right side of engine compartment, 14.5 cm from right headlamp breakout.
S115	Inside transaxle, 19 cm from C113.
S121	Fuel injector jumper harness, midway between fuel injector No. 3 breakout & manifold absolute pressure sensor breakout.
S131	Engine wiring harness, right front of engine, 4.7 cm from C112.
S144	Engine jumper harness, 12 cm from ignition control module.
S145	Engine jumper harness, 18.5 cm from ignition control module.
S148	Forward lamp wiring harness, near left headlamp, 18.5 cm from G101 breakout.
S150	Forward lamp wiring harness, near left headlamp, 17 cm from ambient air temperature sensor breakout.
S157 (3.4L VIN E)	Engine wiring harness, left front of engine compartment, 10.5 cm from C112 breakout.
S157 (3.8L VIN K)	Engine wiring harness, at EGR valve breakout.
S158 (3.4L VIN E)	Engine wiring harness, left front of engine compartment, 4 cm from C112 breakout.
S158 (3.8L VIN K)	Engine wiring harness, left rear of engine, 6.5 cm from EGR valve breakout.
S169 (3.4L VIN E)	Engine wiring harness, lower left rear of engine compartment, 4 cm from C113 breakout.
S169 (3.8L VIN K)	Engine wiring harness, lower left rear of engine compartment, 6.5 cm from C113 breakout.
S172	Forward lamp wiring harness, 2.5 cm from ambient air temperature sensor breakout.
S173	Forward lamp wiring harness, 4 cm from ambient air temperature sensor breakout.
S174	Forward lamp wiring harness, 10.5 cm from ambient air temperature sensor breakout.
S175	Forward lamp wiring harness, 31.5 cm from ambient air temperature sensor breakout.
S176	Forward lamp wiring harness, 7 cm left of right headlamp connector breakout.
S177	Inside underhood junction block.
S178	Inside underhood junction block.
S179	Inside underhood junction block.
S216	I/P wiring harness, behind dash, 6.5 cm from HVAC control module vacuum supply tube breakout.
S217	I/P wiring harness, 7.5 cm from BCM breakout.
S229	I/P wiring harness, behind right center of dash, 8.5 cm from ignition switch breakout.
S234	I/P wiring harness, behind center of dash, 32.5 cm from ignition switch.
S236	I/P wiring harness, behind left side of dash, 4 cm from BCM breakout.
S244	I/P wiring harness, 16 cm from circuit breaker No. 3.
S253	I/P wiring harness, behind lower left side of dash, 24 cm from SP205 breakout.
S320	Main body wiring harness, left side of passenger compartment, 6.5 cm from C311 breakout.
S322	Main body wiring harness, left side of passenger compartment, 10 cm from C311 breakout.
S328	Main body wiring harness, 70 cm from C405 breakout.
S360	Main body wiring harness, right side of floor, 25 cm from C356 breakout.
S370	Main body wiring harness, right side of floor, 31 cm from C356 breakout.
S390 (Impala)	Roof wiring harness, 6.5 cm from breakout for right courtesy/reading lamp.
S390 (Monte Carlo)	Roof wiring harness, right side of roof, 30 cm from dome lamp breakout.
S391 (Impala)	Roof wiring harness, right side of roof, 12.5 cm from dome lamp breakout.
S391 (Monte Carlo)	Roof wiring harness, right side of roof, 20 cm from dome lamp breakout.
S392 (Impala)	Roof wiring harness, right side of roof, 6 cm from dome lamp breakout.
S392 (Monte Carlo)	Roof wiring harness, right side of roof, 10 cm from dome lamp breakout.
S400	Rear body wiring harness, right side of rear compartment, 19.5 cm from P400.
S401	Rear body wiring harness, right side of rear compartment, 26 cm from P400.
S410	On anode (+) side of D400.
S420	On cathode (-) side of D400.
S430	Main body wiring harness, right side of rear compartment, 4 cm from breakout for C420.
S440	Main body wiring harness, right side of rear compartment, 4 cm from breakout for rear junction block.
S504 (Impala)	Driver door wiring harness, 6.5 cm from driver window switch breakout.
S504 (Monte Carlo)	Driver door wiring harness, 6.5 cm forward of outside rearview mirror connector breakout.
S550 (Impala)	Driver door wiring harness, 4 cm forward of outside rearview mirror connector breakout.
S550 (Monte Carlo)	Driver door wiring harness, 3.5 cm forward of outside rearview mirror connector breakout.
S604 (Impala)	Passenger front door wiring harness, 6.5 cm from door lock switch breakout.
S604 (Monte Carlo)	Passenger door wiring harness, 6.5 cm rearward of outside rearview mirror connector breakout.
S650 (Impala)	Passenger front door wiring harness, 4 cm from door lock switch breakout.
S650 (Monte Carlo)	Passenger door wiring harness, 3.5 cm forward of outside rearview mirror connector breakout.
S900	Rear compartment lid wiring harness, 20 cm from center high mounted stoplamp breakout.
S901	In back-up lamps harness, 14 cm from P909.
S902	In back-up lamps harness, 7 cm from P909.