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

Forward Lamp Harness Routing


Object Number: 1549245  Size: LF
(1)C105
(2)Fuse Block - Underhood C4
(3)Park/Turn Signal Lamp - LF
(4)C102
(5)Horn Assembly
(6)C118
(7)Windshield Washer Fluid Level Switch (U68)
(8)Headlamp Washer Fluid Pump (CE4)
(9)Windshield Washer Fluid Pump
(10)A/C Low Pressure Switch
(11)S104 (W49)
(12)S103
(13)G103
(14)Park/Turn Signal Lamp - RF
(15)Marker Lamp -RF
(16)Cornering Lamp - Right (Z88/W49)
(17)Fog Lamp - RF
(18)C103
(19)Rear Window Washer Fluid Pump
(20)S113
(21)Ambient Air Temperature Sensor (CJ3)
(22)S107
(23)Fog Lamp - LF
(24)S106 (W49)
(25)Cornering Lamp - Left (Z88/W49)
(26)Marker Lamp - LF
Figure 2:

Chassis Harness Routing


Object Number: 1701042  Size: LF
(1)Electronic Frontal Sensor (EFS) - Right
(2)Front Axle Actuator (NP8)
(3)Wheel Speed Sensor - RF
(4)Electronic Brake Control Module (EBCM)
(5)Secondary Air Injection (AIR) Pump (4.2L w/K18)
(6)C310 (4WD)
(7)Vehicle Speed Sensor (VSS) (4WD)
(8)S306
(9)Fuel Pump and Sender Assembly
(10)Evaporative Emission (EVAP) Canister Vent Solenoid
(11)Air Suspension Sensor - RR (G67)
(12)Air Suspension Compressor Assembly C1 (G67)
(13)Backup Lamp - Right (Z88)
(14)Backup Lamp - Left (Z88)
(15)S408 (Z88)
(16)G403
(17)Air Suspension Sensor - LR (G67)
(18)Fuel Tank Pressure (FTP) Sensor
(19)S359 (5.3L/6.0L)
(20)G305
(21)Propshaft Speed Sensor - Rear
(22)Transfer Case Encoder Motor (4WD)
(23)Propshaft Speed Sensor - Front
(24)Secondary Air Injection (AIR) Pump Relay (4.2L w/K18)
(25)G304
(26)Wheel Speed Sensor - LF
(27)C101
(28)Fuse Block - Underhood C3
(29)Fuse Block - Underhood C7
(30)Electronic Frontal Sensor (EFS) - Left
Figure 3:

Body Harness Routing


Object Number: 1549270  Size: LF
(1)Splice Pack SP306
(2)S374 (BAE)
(3)S362 (BAE)
(4)Center High Mounted Stop Lamp (CHMSL)
(5)C900
(6)S401
(7)G401
(8)Tail Lamp Circuit Board - Left
(9)C304
(10)Inflatable Restraint Roof Rail Module - Left
(11)Fuse Block - Rear C2
(12)C700
(13)Air Temperature Sensor Assembly - Inside (CJ2)
(14)G302
(15)S302
(16)C317
(17)C500
(18)C311
(19)C306
(20)C314
(21)C318
(22)C203 (ASF)
(23)C202
(24)C220 (U42)
(25)C600
(26)S310
(27)S303
(28)G303
(29)C800
(30)Vehicle Communication Interface Module (VCIM) (UE1) C1
(31)Vehicle Communication Interface Module (VCIM) (UE1) C2
(32)Inflatable Restraint Roof Rail Module - Right
(33)S402
(34)Audio Amplifier (UQA) C2
(35)Audio Amplifier (UQA) C1
(36)Tail Lamp Circuit Board - Right
(37)G402
Figure 4:

Engine Harness Routing - Left Front (4.2L)


Object Number: 1775169  Size: MF
(1)Engine Coolant Temperature (ECT) Sensor
(2)Evaporative Emission (EVAP) Canister Purge Solenoid
(3)Engine Control Module (ECM) X3
(4)Throttle Body
(5)Manifold Absolute Pressure (MAP) Sensor
(6)Engine Control Module (ECM) X2
(7)X100
(8)Starter
(9)Fuse Block - Underhood X1
(10)Knock Sensor (KS) 2 - Rear
(11)Crankshaft Position (CKP) Sensor
(12)G109
(13)G108
(14)G110
(15)A/C Compressor Clutch Assembly
(16)A/C Refrigerant Pressure Sensor
(17)Knock Sensor (KS) 1 - Front
(18)G107
(19)Generator
Figure 5:

I/P Harness Routing - Engine Compartment


Object Number: 1549264  Size: LF
(1)X101
(2)G104
(3)G105
(4)G102
(5)X107 (5.3L/6.0L)
(6)X105
(7)Fuse Block - Underhood X2
(8)S117
(9)X100
(10)Engine Control Module (ECM) X1 (4.2L)
Figure 6:

Engine Harness Routing - Left Rear (5.3L/6.0L)


Object Number: 1701037  Size: LF
(1)Generator
(2)S112 (5.3L)
(3)Evaporative Emission (EVAP) Canister Purge Solenoid
(4)C109
(5)Fuel Injector 3
(6)Fuel Injector 5
(7)Fuel Injector 7
(8)Engine Oil Pressure (EOP) Sensor
(9)Valve Lifter Oil Manifold (VLOM) Assembly (5.3L)
(10)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2
(11)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
(12)Vehicle Speed Sensor (VSS) (2WD)/C310 (4WD)
(13)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2
(14)Park/Neutral Position (PNP) Switch
(15)G107
(16)Knock Sensor (KS) 1 - Left
(17)G108
(18)C107
(19)Engine Coolant Temperature (ECT) Sensor
(20)Engine Control Module (ECM) C1
(21)Engine Control Module (ECM) C2
(22)Engine Control Module (ECM) C3
(23)Fuse Block - Underhood C1
(24)S100
(25)Brake Booster Vacuum Sensor (5.3L)
(26)Fuel Injector 1