GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Impala 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Harness Routing Views
Figure 1:

Forward Lamp Harness
Object Number: 885131 Size: LF
(1)C106
(2)Cooling Fan-Right Connector
(3)G101
(4)Headlamp Assembly-Left Connector
(5)Ambient Air Temperature Sensor Connector (w/U68)
(6)Fog Lamp-LF Connector
(7)Cooling Fan-Left Connector
(8)Horn Assembly Connector
(9)Fog Lamp-RF Connector
(10)Headlamp Assembly-Right Connector
Figure 2:

Right Side of Engine Compartment
Object Number: 514086 Size: LF
(1)P100
(2)Fusible Links (Underhood Junction Block)
Figure 3:

Underhood Junction Block
Object Number: 487972 Size: LF
(1)C112
(2)Junction Block--Underhood (Top and Bottom)
Figure 4:

Right Front of Engine Compartment (w/6J3)
Object Number: 592715 Size: LF
(1)C122
Figure 5:

Left Front of Engine (LA1)
Object Number: 619200 Size: LF
(1)C102
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Exhaust Gas Recirculation (EGR) Valve
(4)Throttle Position (TP) Sensor
(5)Idle Air Control (IAC) Valve
(6)Exhaust Gas Recirculation (EGR) Valve
(7)Evaporative Emission (EVAP) Canister Purge Solenoid
(8)Engine Oil Pressure (EOP) Switch
(9)Crankshaft Position (CKP) Sensor A Connector and Bracket
(10)Knock Sensor (KS)
(11)Engine Oil Pressure (EOP) Switch Connector
(12)Fusible Links (Starter)
(13)A/C Compressor Clutch Diode
(14)Knock Sensor (KS)
(15)Crankshaft Position (CKP) Sensor A Connector and Bracket
(16)Positive Crankcase Ventilation (PCV) Valve
(17)Camshaft Position (CMP) Sensor Connector
Figure 6:

Left Front of Engine (L36)
Object Number: 741696 Size: LF
(1)C110
(2)C126
(3)Evaporative Emission (EVAP) Canister Purge Solenoid
Figure 7:

Lower Right Rear of Engine (L36)
Object Number: 743024 Size: LF
(1)C125-Knock Sensor Jumper Harness
(2)Engine Oil Pressure (EOP) Switch
(3)Vehicle Speed Sensor
(4)C125-Engine Harness
Figure 8:

Left Center of Engine Compartment
Object Number: 732595 Size: LF
(1)C101
(2)G151
(3)A/C Refrigerant Pressure Sensor
(4)C113
(5)Electronic Brake Control Module (EBCM)
(6)Cruise Control Module (CCM)
Figure 9:

Forward of Windshield
Object Number: 744499 Size: LF
(1)Windshield Wiper System Module
(2)P103
(3)P101
Figure 10:

Left Side of Instrument Panel
Object Number: 741678 Size: LF
(1)Instrument Panel
(2)Junction Block-Left I/P
(3)Junction Block-Left I/P Connector C2
(4)C217
(5)Main Body Wiring Harness
(6)C217
Figure 11:

Lower Center of Instrument Panel (w/o 9C1/9C3)
Object Number: 487935 Size: LF
(1)G203
(2)Inflatable Restraint Steering Wheel Module Coil Connector C1
(3)Data Link Connector (DLC)
(4)C201
(5)Stop Lamp Switch Connectors
(6)Cruise Control Release Switch Connector
(7)Cruise Control Release Switch
(8)G201
Figure 12:

Bottom Center of Instrument Panel (w/o D55)
Object Number: 488022 Size: LF
(1)Ashtray
(2)C240
(3)C240
Figure 13:

Behind Right Side of Instrument Panel (SEO)
Object Number: 741574 Size: LF
(1)Blower Motor
(2)C255
(3)C297
(4)Emergency Vehicle Front Lamps Flasher
(5)C297
(6)C209
(7)C299
Figure 14:

Lower Left of Passenger Compartment
Object Number: 488359 Size: LF
(1)Inflatable Restraint Side Impact Sensor (SIS)-LF (Impala)
(2)G301
(3)Junction Block-Left IP Connector C2
(4)Park Brake Switch Connector
(5)C301
(6)C205
(7)C355 (Impala)
Figure 15:

Console and Center of Floor
Object Number: 885136 Size: LF
(1)Cigar Lighter
(2)Heated Seat Switch-Driver (Monte Carlo) Connector
(3)Heated Seat Switch-Front Passenger (Monte Carlo) Connector
(4)C317
(5)C315
(6)Auxiliary Power Outlet
(7)Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector
(8)C312
(9)Inflatable Restraint Side Impact Module-LF Connector
(10)C311
(11)A/T Shift Lock Control Solenoid
Figure 16:

Lower Right of Passenger Compartment
Object Number: 858706 Size: LF
(1)C302
(2)C218
(3)Junction Block-Right I/P Connector (Main Body Harness Side)
(4)C225
(5)G302
(6)C306 (w/9C1/9C3)
(7)C308 (w/9C1/9C3)
Figure 17:

Lower Right Center Rear of Vehicle
Object Number: 488385 Size: LF
(1)C356
(2)C405
Figure 18:

Driver Door (Impala)
Object Number: 487902 Size: LF
(1)Outside Rearview Mirror Switch Connector
(2)Outside Rearview Mirror-Driver Connector
(3)P500
(4)C301
(5)P500
(6)Speaker-LF Door Connector
(7)Window Motor-Driver Connector
(8)Door Lock-Driver, C1
(9)Door Lock-Driver, C2
(10)Door Lock Cylinder Switch-Driver Connector (UA6)
(11)Window Lockout Switch Connector
(12)Window Switch-Driver Connector
(13)Door Lock Switch-Driver Connector
Figure 19:

Driver Door (Monte Carlo)
Object Number: 488218 Size: LF
(1)Door Lock Switch-Driver Connector
(2)Outside Rearview Mirror-Driver Connector
(3)P500
(4)C301
(5)Speaker-LF Door Connector
(6)Window Motor-Driver Connector
(7)Window Switch-Driver Connector
(8)Outside Rearview Mirror Switch Connector
(9)Door Lock-Driver, C1
(10)Door Lock-Driver, C2
(11)Door Lock Cylinder Switch-Driver Connector (UA6)
Figure 20:

Front Pasenger Door (Impala)
Object Number: 885133 Size: LF
(1)Door Lock Switch-Front Passenger Connector
(2)Window Switch-Front Passenger Connector
(3)Door Lock-Front Passenger, C2
(4)Door Lock-Front Passenger, C1
(5)Window Motor-Front Passenger Connector
(6)Speaker-RF Door Connector
(7)P600
(8)C302
(9)Outside Rearview Mirror-Passenger Connector
Figure 21:

Front Passenger Door (Monte Carlo)
Object Number: 885134 Size: LF
(1)Door Lock Switch-Front Passenger Connector
(2)Door Lock-Front Passenger, C2
(3)Door Lock-Front Passenger, C1
(4)Window Switch-Front Passenger Connector
(5)Window Motor-Front Passenger Connector
(6)Speaker-RF Door Connector
(7)C320
(8)P600
(9)Outside Rearview Mirror-Passenger Connector
Figure 22:

Right Rear Door, Left Rear Similar
Object Number: 487907 Size: LF
(1)Door Lock-RR, C2
(2)Door Lock-RR, C1
(3)Window Switch-RR Connector
(4)C356 Shown, C355 Similar
(5)P800 Shown, P700 Similar
(6)Window Motor-RR Connector
Figure 23:

Above Left Side of Package Shelf
Object Number: 695155 Size: MF
(1)C395
(2)C393
(3)Cellular Antenna Coax Connector
(4)C392
(5)Main Body Wiring Harness
Figure 24:

Right Upper Rear of Passenger Compartment
Object Number: 781183 Size: LF
(1)C435
(2)Speaker-RR Connector
(3)C430
(4)C400
(5)Audio Amplifier Connector C2
(6)Audio Amplifier Connector C1
(7)Rear Compartment Courtesy Lamp Connector
(8)Speaker-LR Connector
(9)C373
Figure 25:

Left Center of Rear Compartment
Object Number: 488377 Size: LF
(1)Main Body Wiring Harness
(2)P408
Figure 26:

Rear Compartment Lid (Impala)
Object Number: 488163 Size: LF
(1)Rear Compartment Lid Release Actuator Connector
(2)Rear Compartment Lid Ajar Switch Connector
(3)Center High Mounted Stop Lamp (CHMSL) Connector
(4)C901
(5)P900
(6)P401
(7)C430
Figure 27:

Rear Compartment Lid (Monte Carlo)
Object Number: 488185 Size: LF
(1)Rear Compartment Lid Ajar Switch Connector
(2)Center High Mounted Stop Lamp (CHMSL) Connector
(3)Rear Compartment Lid Release Actuator Connector
(4)C430
(5)C430
(6)P900
Figure 28:

Body Rear End (Impala)
Object Number: 487861 Size: LF
(1)C400
(2)Tail Lamp-Right Connector
(3)P400
(4)License Lamp-Right Socket
(5)License Lamp-Left Socket
(6)Tail Lamp-Left Connector
Figure 29:

Body Rear End (Monte Carlo)
Object Number: 488222 Size: LF
(1)C400
(2)Tail Lamp-Right Connector
(3)P400
(4)Backup Lamp-Right Socket
(5)License Lamp Socket
(6)Backup Lamp-Left Socket
(7)Tail Lamp-Left Connector
Figure 30:

Rear Compartment Lid (Impala)
Object Number: 498553 Size: LF
(1)P909
(2)C901
(3)Reflex
(4)Reflex
(5)Rear Lamp Applique
(6)Backup Lamp-Left