Harness Routing Views. Chevrolet Express

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2003 🢒 Express - AWD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E/4L65-E 🢒 Harness Routing Views

Figure 1:

Forward Lamps Harness Routing


(1)	Marker Lamp Connector - LF
(2)	G100
(3)	Headlamp - Low Beam Connector - Left (Composite)
(4)	Headlamp - High Beam Connector - Left (Composite)
(5)	S110
(6)	S118
(7)	Park/Turn Signal Lamp Connector - RF
(8)	Marker Lamp Connector - RF
(9)	G101
(10)	Headlamp - Low Beam Connector - Right (Composite)
(11)	Headlamp - High Beam Connector - Right (Composite)
(12)	Park/Turn Signal Lamp Connector - LF
(13)	Fuse Block Underhood - C4

Figure 2:

Engine Harness - Left Side of the Engine (4.3L)


(1)	S101
(2)	A/C Compressor Clutch Connector (C60)
(3)	Throttle Position (TP) Sensor Connector
(4)	Idle Air Control (IAC) Valve Connector
(5)	A/C High Pressure Switch Connector (C60)

Figure 3:

Engine Harness - Right Side of the Engine (4.3L)


(1)	Central Sequential Fuel Injection (Central SFI) Connector
(2)	Manifold Air Pressure (MAP) Sensor Connector
(3)	Ignition Control Module (ICM) Connector
(4)	Generator Connector
(5)	S102
(6)	Ignition Coil Connector
(7)	Evaporative Emission (EVAP) Canister Purse Solenoid Connector

Figure 4:

Engine Harness - Rear of the Engine Compartment (4.3L)


(1)	S101
(2)	C109
(3)	Powertrain Control Module (PCM) C1, C2
(4)	Fuse Block Underhood - C6
(5)	Fuse Block Underhood - C1
(6)	Horn Assembly Connector
(7)	C100
(8)	C101
(9)	A/C Compressor Clutch Connector (C60)

Figure 5:

Engine Harness - Rear of the Engine (4.3L/5.3L)


(1)	Vehicle Speed Sensor (VSS) Connector
(2)	C175

Figure 6:

Engine Harness - Left Side of the Engine (4.8L/5.3L/6.0L)


(1)	Fuel Injector 1 Connector
(2)	Fuel Injector 3 Connector
(3)	Fuel Injector 5 Connector
(4)	S101
(5)	C103
(6)	S102
(7)	Fuel Injector 7 Connector
(8)	Ignition Coil/Module 7 Connector
(9)	Ignition Coil/Module 5 Connector
(10)	C126
(11)	Ignition Coil/Module 3 Connector
(12)	Engine Coolant Temperature (ECT) Sensor Connector
(13)	Ignition Coil/Module 1 Connector

Figure 7:

Engine Harness - Right Side of the Engine (4.8L/5.3L/6.0L)


(1)	Fuel Injector 8 Connector
(2)	Fuel Injector 6 Connector
(3)	Fuel Injector 4 Connector
(4)	Fuel Injector 2 Connector
(5)	Exhaust Gas Recirculation (EGR) Valve Connector (6.0L)
(6)	Ignition Coil/Module 2 Connector
(7)	Ignition Coil/Module 4 Connector
(8)	Ignition Coil/Module 6 Connector
(9)	C127
(10)	Ignition Coil/Module 8 Connector

Figure 8:

Engine Harness - Top of the Engine (4.8L/5.3L/6.0L)


(1)	Manifold Absolute Pressure (MAP) Sensor Connector
(2)	S102
(3)	S101
(4)	C103
(5)	Evaporative Emission (EVAP) Canister Purge Solenoid Valve
(6)	Throttle Body

Figure 9:

Engine Harness - Rear of the Engine Compartment (4.8L/5.3L/6.0L)


(1)	C109
(2)	Powertrain Control Module (PCM) C1, C2
(3)	Fuse Block Underhood - C6
(4)	Horn Assembly Connector
(5)	Fuse Block Underhood - C1
(6)	C100
(7)	C101
(8)	Brake Fluid Level Switch Connector (Heavy Duty)

Figure 10:

Engine Harness - Rear of the Engine (4.8L/6.0L)


(1)	Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Connector
(2)	Automatic Transmission Input Speed (A/T ISS) Sensor Connector
(3)	Vehicle Speed Sensor (VSS) Connector
(4)	C175
(5)	Park/Neutral Position (PNP) Switch - C1
(6)	Park/Neutral Position (PNP) Switch - C2

Figure 11:

Engine Harness - Oxygen Sensors (4.8L/6.0L)


(1)	C128
(2)	Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Connector
(3)	Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Connector
(4)	Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Connector
(5)	Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Connector

Figure 12:

Power Brake (PB) Booster Fluid Alarm Switches Harness Routing (UJ1)


(1)	Power Brake (PB) Booster Fluid Pressure Alarm Switch Connector
(2)	C141
(3)	Power Brake (PB) Booster Fluid Flow Alarm Switch - C1, C2

Figure 13:

I/P Harness Routing - Front of the Engine Compartment


(1)	C100
(2)	C104 (Late Production)
(3)	Inflatable Restraint Front End Sensor Connector
(4)	Radiator Support

Figure 14:

I/P Harness Routing - Left Side of the Passenger Compartment


(1)	Park Brake Switch
(2)	Park Brake Switch Connector
(3)	C220
(4)	C311
(5)	C318

Figure 15:

I/P Harness Routing - Lower Left Side of the Passenger Compartment


(1)	Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector
(2)	C318
(3)	G301
(4)	G302
(5)	G303
(6)	SP200
(7)	C222 (YF7)
(8)	Seat Belt Pretentioner Connector - LF (Light Duty)
(9)	C300 (Light Duty)
(10)	Fuse Block Body - C5 (YF7)
(11)	Fuse Block Body - C3

Figure 16:

I/P Harness Routing - Left Side of the I/P


(1)	C221
(2)	Data Link Connector (DLC)
(3)	Stop Lamp Switch Connector

Figure 17:

I/P Harness Routing - Center of the I/P


(1)	HVAC Control Assembly Connectors
(2)	S246 (DE7)
(3)	S245 (DE7)
(4)	Instrument Panel Cluster (IPC) Connector
(5)	Remote Control Door Lock Receiver (RCDLR) Connector (AU0)
(6)	S248
(7)	C200
(8)	Vehicle Communication Interface Module (VCIM) - C1, C2, C5, C6 (UE1)
(9)	Turn Signal/Hazard Flasher Module Connector
(10)	Cigar Lighter Connector
(11)	Tow/Haul Switch Connector
(12)	Antenna Connector
(13)	Radio - C1, C2

Figure 18:

I/P Harness Routing - Right Side of the I/P


(1)	Auxiliary Power Outlet Connector
(2)	Inflatable Restraint I/P Module Connector
(3)	S249
(4)	S250
(5)	Body Control Module (BCM) - C1, C2, C3, C4, C5
(6)	Air Temperature Actuator Connector

Figure 19:

I/P Harness Routing - Right Side of the Passenger Compartment


(1)	C201 (UE1)
(2)	C225 (DF5/UE1)
(3)	C312
(4)	G304
(5)	C202 (UE1)

Figure 20:

Steering Column Harness Routing


(1)	Turn Signal/Multifunction Switch Lever
(2)	Ignition Key Cylinder
(3)	A/T Shift Lock Control Solenoid Connector
(4)	C200

Figure 21:

Mobile Telephone, Navigation and Inside Rearview Mirror Harness


(1)	Inside Rearview Mirror Connector (DF5/UE1)
(2)	Navigation Antenna Connector (UE1)
(3)	Cellular Antenna Connector (UE1)
(4)	Cellular Telephone Microphone Connector (UE1)
(5)	C225 (DF5/UE1)

Figure 22:

Front Headliner Harness Routing


(1)	C304 (w/o YF7)
(2)	C420 (C69/Rear Auxiliary Controls w/o YF7)
(3)	S332 (Passenger)
(4)	S314
(5)	Left B-Pillar

Figure 23:

HVAC Controls Harness Routing


(1)	HVAC Control Assembly Connector - Rear Auxiliary (C69)
(2)	HVAC Control Processor Connector - Auxiliary (C69)
(3)	HVAC Control Assembly Connector - Front Auxiliary (C69)
(4)	S355 (Rear Auxiliary Controls w/YF7)
(5)	S307 (Rear Auxiliary Controls w/YF7)
(6)	S354 (Rear Auxiliary Controls w/YF7)
(7)	S305 (Rear Auxiliary Controls w/YF7)
(8)	S306 (Rear Auxiliary Controls w/YF7)
(9)	S314
(10)	C303 (Rear Auxiliary Controls w/YF7/C69)
(11)	Left B-Pillar
(12)	C203 (YF7/DH6)

Figure 24:

Chassis Harness Routing (Passenger/Cargo)


(1)	Fuse Block Underhood - C3
(2)	Fuse Block Underhood - C7
(3)	Fuse Block Underhood - C8 (UY7)
(4)	Wheel Speed Sensor (WSS) Connector - RF
(5)	Brake Pressure Differential Switch Connector (Light Duty)
(6)	Evaporative Emission (EVAP) Canister Vent Solenoid Connector
(7)	S301
(8)	Electronic Brake Control Module (EBCM) - C2
(9)	Electronic Brake Control Module (EBCM) - C1
(10)	Trailer Right Stop/Turn Relay (UY7)
(11)	Trailer Left Stop/Turn Relay (UY7)
(12)	G300
(13)	Wheel Speed Sensor (WSS) Connector - LF
(14)	C101

Figure 25:

Inner Center Frame (Cutaway)


(1)	Fuel Tank Pressure (FTP) Sensor Connector
(2)	Fuel Pump and Sender Assembly Connector
(3)	S301
(4)	Evaporative Emission (EVAP) Canister Vent Solenoid Connector
(5)	Electronic Brake Control Module (EBCM) - C2
(6)	Electronic Brake Control Module (EBCM) - C1

Figure 26:

Rear Frame


(1)	C405 (Cutaway)
(2)	S402
(3)	G400

Figure 27:

Driver Door Harness Routing


(1)	Outside Rearview Mirror Connector - Driver (DE5/DE7)
(2)	Window Switch Connector - Driver (A31)
(3)	Outside Rearview Mirror Switch Connector (DE5/DE7)
(4)	Window Motor Connector - Driver (A31)
(5)	Door Lock Switch Connector - Driver (AU3)
(6)	C311
(7)	Speaker Connector - LF Door
(8)	S500 (AU3)
(9)	S502 (DE5/DE7)

Figure 28:

Passenger Door Harness Routing


(1)	Window Motor Connector - Front Passenger (A31)
(2)	Window Switch Connector - Front Passenger (A31)
(3)	Outside Rearview Mirror Connector - Passenger (DE5/DE7)
(4)	S600 (AU3)
(5)	Speaker Connector - RF Door
(6)	C312
(7)	Door Lock Switch Connector - Front Passenger (AU3)

Figure 29:

Body Harness Routing - Left Front of the Passenger Compartment


(1)	S313 (Light Duty)
(2)	C307
(3)	C319 (C36/ENC)
(4)	C318
(5)	C311
(6)	Fuse Block Body - C4 (YF7)
(7)	C300 (Light Duty)

Figure 30:

Body Harness Routing - Left B-Pillar (Passenger/Cargo)


(1)	Body Harness Cover
(2)	S311 (w/o YF7)
(3)	S310 (w/o YF7)
(4)	S308 (w/o YF7)
(5)	C304 (w/o YF7)
(6)	C203 (YF7/DH6)
(7)	C303 (YF7/C69 w/Rear Auxiliary Controls)
(8)	Door Contact Plate Connector - Left (E26/AU3)
(9)	C407 (ENC)
(10)	C409 (ENC)
(11)	Fuse Block Body - C2
(12)	S310 (YF7)
(13)	S308 (YF7)
(14)	S311 (YF7)
(15)	Body Harness
(16)	Body Harness
(17)	Lower B-Pillar
(18)	Door Ajar Switch Connector - LR (E26)
(19)	SP347
(20)	G347

Figure 31:

Body Harness Routing - Right B-Pillar


(1)	C312
(2)	Seat Belt Pretensioner Connector - RF (Light Duty)
(3)	C306
(4)	Door Contact Plate Connector - Right (Passenger/Cargo w/AU3)
(5)	Door Ajar Switch Connector - RR (Passenger/Cargo)

Figure 32:

Body Harness Routing - Left Rear of the Passenger Compartment (YF7)


(1)	C321
(2)	C320

Figure 33:

Body Harness Routing - Rear of the Passenger Compartment (Passenger/Cargo)


(1)	G401
(2)	S451
(3)	C415
(4)	C419
(5)	S450
(6)	S401
(7)	S404
(8)	G402
(9)	Tail Lamp Assembly Connector - Left
(10)	C411
(11)	C407 - 135 Wheel Base (C36/C69)
(12)	C409 - 135 Wheel Base (C36/C69)
(13)	C400
(14)	C412
(15)	Tail Lamp Assembly Connector - Right
(16)	S403 (w/o YF7)

Figure 34:

Pro Harness and Components (PRP)


(1)	Dome Fluorescent Work Lamp - LR (UF2)
(2)	Dome Fluorescent Work Lamp - LF (UF2)
(3)	S350 (UF2)
(4)	S348 (UF2)
(5)	Dome Fluorescent Work Lamp - 2 (UF2)
(6)	Dome Fluorescent Work Lamp - 1 (UF2)
(7)	Dome Fluorescent Work Lamp - RH (UF2)
(8)	Access Panel Actuator - Right Side Front
(9)	Access Panel Actuator - Right Side Rear
(10)	S409
(11)	C204
(12)	Body Control Module (BCM)
(13)	S205
(14)	C206
(15)	C205
(16)	I/P Harness
(17)	Fuse Block - Body
(18)	S302 (UF2)
(19)	S303
(20)	Fuse Block - Rear
(21)	S309
(22)	S300
(23)	S408
(24)	G403
(25)	Access Panel Actuator - Left Rear Side Rear
(26)	Access Panel Actuator - Left Rear Side Front
(27)	Access Panel Actuator - Left Front Side Rear
(28)	Access Panel Actuator - Left Front Side Front

Figure 35:

Auxiliary Heater and A/C Harness Routing - Front (C36/C69)


(1)	Blower Motor Resistor Assembly Connector - Auxiliary
(2)	C409
(3)	C407
(4)	Blower Motor Connector - Auxiliary
(5)	Air Temperature Actuator Connector - Auxiliary (C69)
(6)	S413

Figure 36:

Auxiliary Heater and A/C Harness Routing - Rear (C36/C69)


(1)	Blower Motor Connector - Auxiliary
(2)	Medium Speed Blower Motor Relay - Auxiliary
(3)	C407
(4)	C409
(5)	Low Speed Blower Motor Relay Connector - Auxiliary
(6)	S412
(7)	S405
(8)	S411 (C69)
(9)	High Speed Blower Motor Relay Connector - Auxiliary
(10)	Mode Actuator Connector - Auxiliary (C69)

Figure 37:

Rear Dome Lamp Harness Routing (Cargo)


(1)	C417
(2)	Dome Lamp - Rear

Figure 38:

Left Rear Cargo Door Harness Routing (Passenger/Cargo)


(1)	Rear Window Defogger Grid Connector - Left (C49)
(2)	C411
(3)	Speaker Connector - LR Door (UB1/UC6)

Figure 39:

Right Rear Cargo Door Harness Routing (Passenger/Cargo)


(1)	Rear Window Defogger Grid Connector - Right (C49)
(2)	Mini-Wedge Door Jamb Switch - Cargo
(3)	Door Lock Switch Connector - Rear Cargo (AU3)
(4)	License Lamp Connector
(5)	S902
(6)	Speaker Connector - RR Door (UB1/UC6)
(7)	C412
(8)	C400