Harness Routing Views. Chevrolet Express

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2007 🢒 Express - AWD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E/4L65-E/4L70-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)	Ignition Coil/Module 2 Connector
(6)	Ignition Coil/Module 4 Connector
(7)	Ignition Coil/Module 6 Connector
(8)	C127
(9)	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 Connector

Figure 11:

Engine Harness - Top of the Engine (LLY)


(1)	C112
(2)	Fuel Rail Pressure (FRP) Sensor
(3)	Turbocharger Vane Position Control Solenoid Valve
(4)	Turbocharger Vane Position Sensor
(5)	Glow Plug Control Module (GPCM)
(6)	Fuel Rail Temperature (FRT) Sensor
(7)	Intake Air Temperature (IAT) Sensor 2
(8)	C111
(9)	C110
(10)	C107
(11)	Fuel Pressure Regulator
(12)	Engine Coolant Temperature (ECT) Sensor
(13)	Intake Air Heater (IAH) Module
(14)	Manifold Absolute Pressure (MAP) Sensor
(15)	C108
(16)	Exhaust Gas Recirculation (EGR) Valve

Figure 12:

Engine Harness - Left Side of the Engine (LLY)


(1)	Horn Assembly Connector
(2)	C100
(3)	C101
(4)	Fuse Block - Underhood C6
(5)	Fuse Block - Underhood C1
(6)	Engine Control Module (ECM) - C2
(7)	Engine Control Module (ECM) - C1
(8)	C108
(9)	C105
(10)	G108
(11)	G104
(12)	S103
(13)	C109
(14)	C107
(15)	S102
(16)	G107
(17)	G102
(18)	G103
(19)	S101

Figure 13:

C115


(1)	C115
(2)	Engine - LMM

Figure 14:

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


(1)	C128 (Cutaway)
(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 15:

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 16:

I/P Harness Routing - Front of the Engine Compartment


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

Figure 17:

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 18:

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


(1)	C318
(2)	G301
(3)	G302
(4)	G303
(5)	C311
(6)	C222 (YF7)
(7)	SP200
(8)	SP250 (Diesel)
(9)	Seat Belt Pretentioner Connector - LF (Light Duty)
(10)	C300 (Light Duty)
(11)	Fuse Block Body - C5 (YF7)
(12)	Fuse Block Body - C3
(13)	Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector

Figure 19:

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


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

Figure 20:

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)	Turn Signal/Hazard Flasher Module Connector
(9)	Cigar Lighter (DT4)/Auxiliary Power Outlet 1 (w/o DT4) Connector
(10)	Tow/Haul Switch Connector
(11)	S206 (Diesel)
(12)	Antenna Connector
(13)	Radio Connector

Figure 21:

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


(1)	Auxiliary Power Outlet 2 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 22:

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


(1)	C225 (DF5)
(2)	G304
(3)	C312

Figure 23:

Steering Column


(1)	Hazard Switch
(2)	Inflatable Restraint Steering Wheel Module Coil - C2 (Light Duty)
(3)	Inflatable Restraint Steering Wheel Module Coil - C1
(4)	Turn Signal/Multifunction Switch
(5)	C200
(6)	C275

Figure 24:

Driver Seat


(1)	Seat Belt Buckle Driver - C1 (Light Duty)
(2)	Seat Belt Buckle Driver - C2 (Light Duty)
(3)	Seat Adjuster Switch - Driver (AG1)
(4)	S304 (AG1)
(5)	C307
(6)	Seat Motors - Driver (AG1)
(7)	Inflatable Restraint Seat Position Sensor (SPS) - Left (Light Duty)
(8)	Seat Belt Buckle Connector - Driver (Heavy Duty)

Figure 25:

Passenger Seat


(1)	Seat Adjuster Switch - Passenger (AG2)
(2)	S317 (Light Duty w/AG2)
(3)	C306
(4)	Inflatable Restraint Passenger Presence System (PPS) Sensor (Light Duty w/o YF7)
(5)	Inflatable Restraint Passenger Presence System (PPS) Module (Light Duty w/o YF7)
(6)	Seat Belt Buckle Passenger - C2 (Light Duty)
(7)	Seat Belt Buckle Passenger - C1 (Light Duty)
(8)	Inflatable Restraint Seat Position Sensor (SPS) - Right (Light Duty)
(9)	Seat Motors - Passenger (AG2)

Figure 26:

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 27:

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 28:

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 (Gas)
(7)	S301
(8)	Electronic Brake Control Module (EBCM) Connector (JL4)/Electronic Brake Control Module (EBCM) - C2 (w/o JL4)
(9)	Electronic Brake Control Module (EBCM) - C1 (w/o JL4)
(10)	Trailer Right Stop/Turn Relay (UY7)
(11)	Trailer Left Stop/Turn Relay (UY7)
(12)	S315 (JL4)
(13)	G300
(14)	Wheel Speed Sensor (WSS) Connector - LF
(15)	C101

Figure 29:

Chassis/Transmission Harness - Center Frame (6.6L)


(1)	Transmission
(2)	C175
(3)	C316
(4)	S316
(5)	Fuel Pump Assembly
(6)	C305 (K08)
(7)	Coolant Heater - Fuel Pump (K08)
(8)	C174
(9)	Park/Neutral Position (PNP) Switch
(10)	C314 (K08) or Coolant Heater - C2 (w/o K08)
(11)	Trailer Stop/Turn Relay - Right (UY7)
(12)	Trailer Stop/Turn Relay - Left (UY7)
(13)	G300

Figure 30:

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 31:

Rear Frame


(1)	C406 (T79)
(2)	S402
(3)	G400
(4)	S903 (T79)
(5)	C405 (Cutaway)
(6)	S904 (T79)

Figure 32:

Rear Frame (JL4)


(1)	C413
(2)	C414

Figure 33:

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 34:

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 35:

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 36:

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 Side (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 Jamb Switch Connector - LR Side (E26)
(19)	SP347
(20)	G347

Figure 37:

Body Harness Routing - Right B-Pillar


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

Figure 38:

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


(1)	C321
(2)	C320

Figure 39:

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)	C401
(10)	C411
(11)	C407 - 135 Wheel Base (C36/C69)
(12)	C409 - 135 Wheel Base (C36/C69)
(13)	C400
(14)	C412
(15)	C402
(16)	S403 (w/o YF7)

Figure 40:

Access/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)	Access/Pro Wiring Harness
(12)	Body Control Module (BCM)
(13)	Fuse Block - Body
(14)	S302 (UF2)
(15)	S303
(16)	Dome Fluorescent Work Lamps Relay (UF2)
(17)	Fuse Block - Rear
(18)	S309
(19)	S300
(20)	S408
(21)	G403
(22)	Access Panel Actuator - Left Rear Side Rear
(23)	Access Panel Actuator - Left Rear Side Front
(24)	Access Panel Actuator - Left Front Side Rear
(25)	Access Panel Actuator - Left Front Side Front

Figure 41:

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 42:

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 43:

Rear Dome Lamp Harness Routing (Cargo)


(1)	C417
(2)	Dome Lamp - Rear

Figure 44:

Left Rear Cargo Door Harness Routing (Passenger/Cargo)


(1)	C901 (C49 w/A12)
(2)	Rear Window Defogger Grid - Left (C49)
(3)	C411
(4)	Speaker Connector - LR Door (UB1/UC6)

Figure 45:

Right Rear Cargo Door Harness Routing (Passenger/Cargo)


(1)	C902 (C49 w/A12)
(2)	Rear Window Defogger Grid - Right (C49)
(3)	Door Latch Assembly - Cargo
(4)	Door Lock Switch Connector - Rear Cargo (AU3)
(5)	License Lamp Connector
(6)	S902
(7)	Speaker Connector - RR Door (UB1/UC6)
(8)	C412
(9)	C400