Harness Routing Views. Chevrolet Avalanche

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2003 🢒 Avalanche - 2WD 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Harness Routing Views

Figure 1:

OnStar® Component Locations


(1)	Global Positioning Satellite (GPS) Antenna
(2)	Cellular Telephone Microphone
(3)	Global Positioning System (GPS)
(4)	Junction Block-Body
(5)	Vehicle Communication Unit (VCU)
(6)	OnStar® Button Assembly
(7)	Vehicle Interface Unit (VIU)

Figure 2:

LH Front of Vehicle


(1)	Upper Radiator Support -Tie Bar
(2)	Headlamp Assembly-LF
(3)	Headlamp - High Beam - Left Connector
(4)	Daytime Running Lamp (DRL)-Left
(5)	Daytime Running Lamp (DRL)-Left Socket
(6)	Windshield Washer Reservoir
(7)	Park/Turn Signal Lamp Socket-LF
(8)	Marker Lamp Socket-LF
(9)	Marker Lamp-LF
(10)	Park/Turn Signal Lamp-LF
(11)	Snowplow Connector C125-Option
(12)	Headlamp Connector-Low Beam-Left
(13)	Marker Lamp-LF

Figure 3:

C103


(1)	Fuse Block-Underhood Bracket
(2)	Inflatable Restraint Harness
(3)	Radiator Support
(4)	Inline Connector-C103-I/P Harness Side
(5)	Inline Connector-C103-Forward Lamp Harness Side
(6)	LH Battery Tray
(7)	Fuse Block-Underhood Bracket
(8)	Fuse Block-Underhood

Figure 4:

C104, C114, C150, C151, C153, C154, and PTO Relay


(1)	Fuse Block - Underhood
(2)	C153 - Engine Harness to Transfer Case Harness
(3)	C150 - Transfer Case Harness to Axle Jumper Harness
(4)	Transfer Case Harness
(5)	C151 - I/P Harness to Automatic Transfer Case Harness (w/NP8/NR4) or C104 - I/P Harness to Forward Lamp Harness (w/o NP8/NR4)
(6)	C154 - I/P Harness to Automatic Transfer Case Harness (w/NP8/NR4) or C114 - Chassis Harness to I/P Harness (w/JL4/NYS)
(7)	Power Take-Off (PTO) Relay

Figure 5:

Inline Connectors Under the Fuse Block-Underhood


(1)	Inline Connector-C102
(2)	Fuse Block-Underhood Support/Mount
(3)	Inline Connector-C152
(4)	Inline Connector-C100

Figure 6:

Engine Harness Connector Locations-8.1L


(1)	MAP Switch Connector
(2)	Surge Tank Switch Connector
(3)	Secondary Air Injection (AIR) Solenoid Relay Connector
(4)	Secondary Air Injection (AIR) Pump Connector
(5)	MAP Sensor Connector
(6)	A/C Compressor Connector
(7)	Engine Wiring Harness Ground
(8)	Oil Pressure Sensor Connector
(9)	Oil Pressure Sensor Connector
(10)	Starter Connector
(11)	Knock Sensor Connector
(12)	Automatic Transmission Input Speed Sensor (ISS) Connector
(13)	Oxygen Sensor Connector
(14)	Turbine Shaft Speed (TSS) Sensor Connector
(15)	Oxygen Sensor Connector
(16)	Power Take Off (PTO) Connector
(17)	Transmission Harness Connector
(18)	Speed Sensor Connector
(19)	Park/Neutral Position (PNP) Switch Connectors
(20)	Oxygen Sensor Connector
(21)	Low Oil Level Sensor Connector
(22)	Crankshaft Position Sensor Connector
(23)	Knock Sensor Connector
(24)	Ignition Coil Connector
(25)	Engine Wiring Harness Ground
(26)	Camshaft Position Sensor Connector
(27)	Powertrain Control Module (PCM) Connectors
(28)	Power Take Off (PTO) Relay Connector
(29)	Inline to IP Harness Connector
(30)	Inline to Chassis Harness Connector
(31)	Junction Block-Underhood
(32)	Transmission Control Module Connectors (M74)
(33)	Throttle Actuator Control (TAC) Module Connector
(34)	Throttle Position (TP) Sensor Connector
(35)	Generator Connector
(36)	Fuel Injector Connector
(37)	Electric Throttle Control Connector

Figure 7:

Left Side of the Engine (4.8, 5.3, and 6.0L)


(1)	Generator Connector
(2)	Evaporative Emission (EVAP) Canister Purge Soleniod
(3)	S104
(4)	C148
(5)	Manifold Absolute Pressure (MAP) Sensor Connector
(6)	Knock Sensor (KS) Connector
(7)	Knock Sensor (KS) Connector
(8)	G104
(9)	Camshaft Position (CMP) Sensor Connector
(10)	Throttle Actuator Control (TAC) Connector
(11)	C153
(12)	G102
(13)	C100
(14)	Fuse Block - Underhood C2
(15)	C152
(16)	Powertrain Control Module (PCM) C2
(17)	Powertrain Control Module (PCM) C1
(18)	S110
(19)	S103

Figure 8:

Right Side of the Engine (4.8, 5.3, and 6.0L)


(1)	Manifold Absolute Pressure (MAP) Sensor Connector
(2)	S102
(3)	Auxiliary Battery Relay Connector (TP2)
(4)	Evaporative Emission (EVAP) Canister Purge Soleniod
(5)	Throttle Actuator Control (TAC) Connector
(6)	Coolant Level Switch Connector
(7)	Intake Air Temperature (IAT)/ Mass Air Flow (MAF) Sensor Connector
(8)	A/C Refrigerant Pressure Sensor Connector
(9)	A/C Compressor Clutch Connector
(10)	A/C Low Pressure Switch Connector
(11)	Engine Oil Level Switch Connector
(12)	Camshaft Position (CMP) Sensor Connector
(13)	Engine Oil Pressure (EOP) Sensor Connector

Figure 9:

Instrument Cluster and C202


(1)	Instrument Panel Cluster (IPC)
(2)	Inline Connector C202 M
(3)	Inline Connector C202 F
(4)	Instrument Cluster Electrical Connector
(5)	Instrument Panel Carrier
(6)	Instrument Panel

Figure 10:

Instrument Panel


(1)	C104 (YE9)
(2)	C106 (PTO)
(3)	Fuse Block Underhood - C1
(4)	C115 (NYS)
(5)	C105 (LB7)
(6)	S214 (NP8)
(7)	S202
(8)	P110
(9)	S213
(10)	S205
(11)	C222 (Except HP2)
(12)	C209 (Z55 or E52)
(13)	C306
(14)	C249
(15)	S210 (UQ7 and Y91)
(16)	C201
(17)	S218
(18)	C221
(19)	C206 (Y91 or HP2)
(20)	S212 (NYS)
(21)	P100
(22)	C154 (NP1 or NP8)
(23)	C102

Figure 11:

LH Top of Dash


(1)	Splice Pack 203 (SP203)
(2)	Ground 203 (G203)
(3)	Dash
(4)	A-Pillar

Figure 12:

Instrument Panel Wiring (at Steering Column)


(1)	Inline Connectors (C201A, C201B and C201C)
(2)	Inline Connector C201
(3)	Inflatable Restraint Harness
(4)	Inflatable Restraint Electrical Connector
(5)	Body Control Module (BCM) Bracket
(6)	Body Control Module (BCM) Harness
(7)	A/T Shift Lock Control Solenoid Connector
(8)	A/T Shift Lock Control Solenoid Electrical Connector
(9)	Lower Steering Column Shaft
(10)	Inflatable Restraint Steering Wheel Module Connector with Tether
(11)	Instrument Panel Bracket

Figure 13:

HVAC Module Assembly (Connections)


(1)	Recirculation Actuator Connector
(2)	Instrument Panel
(3)	Electrical Harness Connector
(4)	Ground 200 (G200)
(5)	Blower Motor Resistor Assembly
(6)	Blower Motor Resistor Connector
(7)	Harness Inline Connector (C296)
(8)	Air Temperature Actuator Connector
(9)	Air Temperature Actuator
(10)	Mode Actuator

Figure 14:

Headliner Harness to Relay Block-Body


(1)	A-Pillar
(2)	Headliner Wiring Harness
(3)	Relay Block-Body
(4)	Headliner Harness Connector C-6

Figure 15:

LH Frame Rail at Body Mount


(1)	Ground 302 (G302)
(2)	LH Body Mount
(3)	Ground Screw
(4)	Electronic Brake Control Module (EBCM)
(5)	Fuel Tank

Figure 16:

LH A-Pillar Behind Kick Panel


(1)	C200 -I/P Harness Side
(2)	C204
(3)	A-Pillar
(4)	C200 -Door Harness Side

Figure 17:

RH A-Pillar Behind Kick Panel


(1)	Side Cowl Panel
(2)	C299 -Door Harness Side - Uplevel
(3)	C299 -I/P Harness Side - Uplevel
(4)	C208 -Right Body Harness Side
(5)	C208 - I/P Harness Side

Figure 18:

Lower RF of the Passenger Compartment


(1)	C222
(2)	C315 (AJ7)
(3)	Body Harness
(4)	C209

Figure 19:

Inline Connectors-C204 and C205


(1)	LH Dash Panel Insulator
(2)	Door Wiring Harness -LH
(3)	Inline Connector C205 -Door Harness Side
(4)	Inline Connector C205 -LH Body Wiring Harness Side
(5)	Inline Connector C204 -LH Body Wiring Harness Side
(6)	Body Wiring Harness-LH
(7)	Inline Connector C204 -I/P Harness Side
(8)	Body Harness-LH

Figure 20:

C210 and Relay Block-Body-C4


(1)	Relay Block-Body
(2)	Relay Block-Body-C4
(3)	C210-Roof Beacon Relay Inline

Figure 21:

Inline Connectors-C304, C299


(1)	Fuse Block-Right I/P
(2)	Fuse Block Right -I/P Connector-C2 -RF Door Harness
(3)	RF Door Harness
(4)	Inline Connector-C304 -Passenger Heated Seat
(5)	Inline Door Harness Connector-C299 -Uplevel Utility

Figure 22:

Driver Seat (1 of 2)


(1)	C321
(2)	Seat Adjuster Switch - Driver
(3)	Memory Seat Module - C4
(4)	Memory Seat Module - C3
(5)	Seat Bolster/Lumbar Switch - Driver
(6)	Seat Recliner Motor - Driver
(7)	C305
(8)	C323
(9)	C325
(10)	C322
(11)	Seat Rear Vertical Motor - Driver
(12)	Seat Front Vertical Motor - Driver
(13)	Memory Seat Module - C2
(14)	Memory Seat Module - C1
(15)	Seat Horizontal Motor - Driver
(16)	C320

Figure 23:

Driver Seat (2 of 2)


(1)	Seat Bolster Motor - Driver
(2)	Seat Lumbar Motor - Driver
(3)	Heated Seat Element - Driver Cushion
(4)	C324
(5)	Seat Belt Switch Connector
(6)	Heated Seat Element - Driver Cushion Connector

Figure 24:

Front Passenger Seat (1 of 2) (w/ AN3)


(1)	Seat Horizontal Motor - Front Passenger
(2)	Seat Front Vertical Motor - Front Passenger
(3)	Seat Rear Vertical Motor - Front Passenger
(4)	C388
(5)	C326
(6)	C399
(7)	Seat Recliner Motor - Front Passenger
(8)	Seat Adjuster Switch - Front Passenger
(9)	Seat Adjuster Switch Connector

Figure 25:

Front Passenger Seat (2 of 2) (w/ AN3)


(1)	Seat Bolster Motor - Front Passenger
(2)	Seat Lumbar Motor - Front Passenger
(3)	Heated Seat Element - Front Passenger Cushion Connector
(4)	C329

Figure 26:

C306 - Avalanche/Suburban


(1)	C306
(2)	Front Floor Console Extension
(3)	Speaker - Subwoofer
(4)	I/P Harness

Figure 27:

C327


(1)	Seat-LR
(2)	C327-Inline to Rear Seat Harness
(3)	LH Body Harness

Figure 28:

Right Body Harness to Rear Seat Harness


(1)	Rear Seat
(2)	Rear Seat Harness Connector (Inline C349)
(3)	Right Body Harness Connector (Inline C349)
(4)	Right Body Harness

Figure 29:

C388


(1)	Seat-RR
(2)	C388-Inline to Seat Harness-RR

Figure 30:

Rear Audio Console Harness Connectors


(1)	Front Floor Compartment
(2)	I/P Harness
(3)	Inline Connector 307 (Uplevel Utility), Inline 340 (Luxury Utility)
(4)	Inline Connector 307 (Uplevel Utility), Inline 340 (Luxury Utility)
(5)	Console Harness
(6)	Inline Connector 314 (Rear Console Harness Side)
(7)	Inline Connector 314 (LH body Harness Side)

Figure 31:

C314 and C341-LH Body Harness to Console


(1)	C341-Avalanche (53 Similar)
(2)	Left Body Harness
(3)	C314-Left Body Harness Side-Luxury Utility
(4)	C314-Console Harness Side-Luxury Utility

Figure 32:

Rear Audio Extension Harness Connectors


(1)	Instrument Panel
(2)	Radio Connectors
(3)	Console Extension Harness
(4)	Inline Connector 253 (IP Harness Side)
(5)	Inline Connector 253 (Console Extension Harness Side)
(6)	Compact Disc Player Connector
(7)	Front Floor Console Extension
(8)	Instrument Panel Harness
(9)	Radio

Figure 33:

Rear HVAC Harness


(1)	Inner Body Side Panel
(2)	Splice Pack 410 (SP410)
(3)	Splice Pack 410A (SP410A)
(4)	Blower Motor Connector
(5)	HVAC Assembly - Auxiliary
(6)	Air Temperature Sensor-Lower Auxiliary
(7)	Mode Actuator-Auxiliary Connector
(8)	Inline Connector 350 -Auxiliary HVAC Harness Side
(9)	Inline Connector 350 -Headliner Harness Side
(10)	Inline Connector 397 -Auxiliary HVAC Harness Side
(11)	Inline Connector 397 -RH Body Harness Side

Figure 34:

Body Harness Rear RH


(1)	Back Body Opening Inner Upper Panel
(2)	CHSML Cargo
(3)	Door Lock Switch Rear Cargo
(4)	Splice Pack 410
(5)	Speaker - RR Connector
(6)	Inline to Headliner

Figure 35:

Body Harness Rear LH


(1)	Body Side Inner Panel
(2)	Body Harness-LH
(3)	Speaker- Subwoofer Connector
(4)	Speaker-LR -D Pillar

Figure 36:

C402


(1)	C402-Chassis Harness Side
(2)	C402-Tail Lamp Harness Side

Figure 37:

Chassis Wiring Harness to Rear Side Rail-LH


(1)	Inline Connector C405 to Tail Lamp Harness
(2)	Shock Absorber Solenoid Connector-RR
(3)	Frame
(4)	Inline Connector C450
(5)	Chassis Harness

Figure 38:

C406 and P475-Escalade/Avalanche EXT w/VSES


(1)	P475
(2)	C406-RH Body Harness Side
(3)	C406-Tail Lamp Harness Side
(4)	Junction Block-C3-Rear Lamps

Figure 39:

Real Time Damping Connector to Body Wiring Harness


(1)	Inline Connector C450 -Chassis Harness Side
(2)	Inline Connector C450 -Body Harness Side
(3)	Frame

Figure 40:

Liftgate Wiring Harness to Liftgate


(1)	Liftgate with Liftglass
(2)	Liftglass Defog Connector
(3)	Liftgate Latch Connector
(4)	Liftgate Lower Latch Connector
(5)	Liftgate Latch Connector
(6)	Liftgate Lower Latch Connector
(7)	Liftgate Latch Connector
(8)	Wiper Motor Connector
(9)	Inline Connector C499

Figure 41:

Rear Lamp Harness to Rear License Plate/Tail Lamp Harness-RH (LH Similiar)


(1)	Back Body Opening Lower Frame
(2)	Rear Lamp Wiring Harness
(3)	Inline Connector 403 -Rear Lamp Harness Side
(4)	Inline Connector 403 -Tail Lamp Harness Side
(5)	Inline Connector 404 -Rear Lamp Harness Side
(6)	Inline Connector 404 -Rear License Plate Harness Side
(7)	License Plate Wiring Harness

Figure 42:

Junction Block-Rear Lamps-C1 and C2


(1)	C2-Gray
(2)	Body Panel-RH Side
(3)	Junction Block-Rear Lamps
(4)	C1-Blue

Figure 43:

Junction Block-Rear Lamps-C3 and C4


(1)	Junction Block-Rear Lamps-Utility
(2)	C4-Tail Lamp Harness -RH
(3)	C3-Rear License Lamp Harness-RH