GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Front Harness Routing


Object Number: 1657825  Size: LF
(1)LF Wheel Speed Sensor
(2)LF Side Marker
(3)Underhood Fuse Block
(4)LH Headlamp
(5)LH Foglamp
(6)LH Turn Signal Lamp
(7)LH Marker Lamp
(8)Cooling Fan Resistor
(9)Hood Open Switch
(10)Horn
(11)RH Marker Lamp
(12)RH Headlamp
(13)RH Turn Signal
(14)Dual Pressure Switch
(15)A/C Compressor
(16)RH Foglamp
(17)G102
(18)G103
(19)Electronic Brake Control Module (EBCM)
(20)RF Side Marker
(21)RF Wheel Speed Sensor
(22)Cooling Fan
(23)G101
Figure 2:

Automatic Tranmission Engine Harness Routing View


Object Number: 1657826  Size: LF
(1)Rear Heated Oxygen Sensor
(2)Front Heated Oxygen Sensor
(3)Transmission Solenoid and Temperature Sensor
(4)Shift Switch
(5)Turbine Sensor
(6)Transmission Control Module
(7)C202
(8)Vehicle Speed Sensor
Figure 3:

Manual Transmission Engine Harness Routing Views


Object Number: 1657828  Size: LF
(1)Electronic Ignition System
(2)Idle Air Control (IAC) Sensor
(3)Throttle Position Sensor
(4)Camshaft Position (CMP) Sensor
(5)C101
(6)Rear Heated Oxygen Sensor
(7)Front Heated Oxygen Sensor
(8)Manifold Absolute Pressure (MAP)Sensor
(9)Canister Purge Solenoid
(10)Fuel Injectors
(11)Generator
(12)Generator Positive Battery Terminal
(13)Starter
(14)G106
(15)Knock Sensor
(16)Vehicle Speed Sensor
(17)Crankshaft Position (CKP) Sensor
(18)C201
(19)Negative Battery Cable
(20)C201
(21)Engine Control Module (ECM)
(22)Positive Battery Cable
(23)Exhaust Gas Recirculation (EGR) Valve
Figure 4:

Instrument Panel Harness Routing View


Object Number: 1657829  Size: MF
(1)LH Dash Speaker
(2)I/P Cluster
(3)ODO/Trip Clock Switch
(4)Hazard Switch
(5)Radio Connector
(6)RH Dash Speaker
(7)C361
(8)CDL Relay
(9)Blower Motor
(10)Blower Motor Resistor
(11)G202
(12)Defroster Switch
(13)Blower Switch
(14)A/C Switch
(15)C202
(16)DLC
(17)Theft Control Module
(18)C201
(19)Headlamp Leveling Switch
(20)Power Mirror Switch
(21)C351
(22)Driver Information Sensor
Figure 5:

SIR Harness Routing Views


Object Number: 1657830  Size: MF
(1) Driver Airbag Module
(2)C203
(3)Passenger Airbag Module
(4)RH Side Impact Sensor
(5)RH Pretensioner
(6)C203
(7)Sensing Diagnostic Module (SDM)
(8)LH Pretensioner
(9)LH Side Impact Sensor
Figure 6:

Body Harness Routing Views


Object Number: 1657833  Size: MF
(1)Speaker - LR
(2)C401
(3)Rear Compartment Lamp
(4)Door Switch - Left Rear
(5)Wheel Speed Sensor - LR
(6)C371
(7)Door Switch - Driver
(8)Seat Belt Switch
(9)C352
(10)C201
(11)Door Switch - Passenger
(12)Wheel Speed Sensor - RR
(13)Backup Lamp
(14)Rear Fog Lamp
(15)Tail Lamp - Left
Figure 7:

Body Rear End Harness Routing Views


Object Number: 1657835  Size: LF
(1)Speaker - Left Rear
(2)Rear Compartment Lamp
(3)G401
(4)Door Switch - Left Rear
(5)Tail Lamp - Right
(6)Backup Lamp
(7)Door Switch - Right Rear
(8)G402
(9)Speaker - Right Rear
(10)Rear Fog Lamp
(11)C401
(12)Tail Lamp - Left
Figure 8:

Front Door Harness Routing Views


Object Number: 1657837  Size: MF
(1)C351
(2)C352
(3)Power Window Motor
(4)Door Lock Actuator
(5)Power Window Switch
Figure 9:

Rear Door Harness Routing Views


Object Number: 1657838  Size: MF
(1)Power Window Switch
(2)Power Window Motor
(3)C371/C381
(4)Door Lock Actuator
Figure 10:

Tailgate Harness Routing Views


Object Number: 1657839  Size: MF
(1)Center High Mounted Stop Lamp Assembly
(2)C401
(3)G403
(4)Tailgate Contact Switch
(5)License Plate Lamp
(6)Rear Wiper Motor
(7)Defroster