GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 TrailBlazer - 4WD 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Harness Routing Views
Figure 1:

Forward Lamp Harness Routing
Object Number: 1549245 Size: LF
(1)X105
(2)Fuse Block - Underhood C4
(3)Park/Turn Signal Lamp - LF
(4)X102
(5)Horn Assembly
(6)X118
(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)J104 (W49)
(12)J103
(13)G103
(14)Park/Turn Signal Lamp - RF
(15)Marker Lamp -RF
(16)Cornering Lamp - Right (Z88)
(17)Fog Lamp - RF
(18)X103
(19)Rear Window Washer Fluid Pump
(20)J113
(21)Ambient Air Temperature Sensor (CJ3)
(22)J107
(23)Fog Lamp - LF
(24)J106 (W49)
(25)Cornering Lamp - Left (Z88)
(26)Marker Lamp - LF
Figure 2:

Cooling Fan Tether Harness Routing
Object Number: 1547958 Size: LF
(1)Cooling Fan
(2)X118
Figure 3:

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 4:

Engine Harness Routing - Right Rear (4.2L)
Object Number: 1549247 Size: LF
(1)Park/Neutral Position (PNP) Switch
(2)Heated Oxygen Sensor (HO2S) Sensor 2
(3)X104
(4)Ignition Coil 5
(5)Ignition Coil 4
(6)Ignition Coil 3
(7)Ignition Coil 2
(8)Ignition Coil 1
(9)Camshaft Actuator Solenoid Assembly
(10)Camshaft Position (CMP) Sensor
(11)Engine Oil Pressure (EOP) Switch
(12)Heated Oxygen Sensor (HO2S) 1
(13)Secondary Air Injection (AIR) Solenoid (K18)
(14)Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor
(15)Ignition Coil 6
(16)X175
(17)Vehicle Speed Sensor (2WD)/C310 (4WD)
Figure 5:

Fuel Injector Harness Routing (4.2L)
Object Number: 1549248 Size: MF
(1)X104
(2)Fuel Injector 6
(3)Fuel Injector 5
(4)Fuel Injector 4
(5)Fuel Injector 3
(6)Fuel Injector 2
(7)Fuel Injector 1
Figure 6:

Engine Harness Routing - Left Rear (5.3L/6.0L)
Object Number: 1701037 Size: LF
(1)Generator
(2)J112 (5.3L)
(3)Evaporative Emission (EVAP) Canister Purge Solenoid
(4)X109
(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)X107
(19)Engine Coolant Temperature (ECT) Sensor
(20)Engine Control Module (ECM) X1
(21)Engine Control Module (ECM) X2
(22)Engine Control Module (ECM) X3
(23)Fuse Block - Underhood X1
(24)J100
(25)Brake Booster Vacuum Sensor (5.3L)
(26)Fuel Injector 1
Figure 7:

Engine Harness Routing - Right Front (5.3L/6.0L)
Object Number: 1549250 Size: LF
(1)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
(2)Fuel Injector 8
(3)X108
(4)Fuel Injector 6
(5)J102
(6)Fuel Injector 4
(7)Fuel Injector 2
(8)Manifold Absolute Pressure (MAP) Sensor
(9)J105
(10)J101
(11)Transmission Control Module (TCM)
(12)Throttle Body
(13)X110
(14)A/C Compressor Clutch Assembly
(15)A/C Refrigerant Pressure Sensor
(16)Knock Sensor (KS) 2 - Right
(17)Starter
(18)Crankshaft Position (CKP) Sensor
(19)Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor
(20)X175
Figure 8:

Camshaft Position Sensor Harness Routing (5.3L/6.0L)
Object Number: 1549251 Size: LF
(1)Camshaft Position (CMP) Sensor
(2)X110
Figure 9:

Ignition Coil Harness Routing (5.3L/6.0L)
Object Number: 1549252 Size: MF
(1)Ignition Coil 1
(2)Ignition Coil 3
(3)C109
(4)Ignition Coil 2
(5)Ignition Coil 5
(6)Ignition Coil 4
(7)X108
(8)Ignition Coil 6
(9)Ignition Coil 7
(10)Ignition Coil 8
Figure 10:

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)X310 (4WD)
(7)Vehicle Speed Sensor (VSS) (4WD)
(8)J306
(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)J359 (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 X3
(29)Fuse Block - Underhood X7
(30)Electronic Frontal Sensor (EFS) - Left
Figure 11:

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 12:

I/P Harness Routing - Rear of the I/P
Object Number: 1549265 Size: MF
(1)Speaker - RF I/P (UQA)
(2)Recirculation Actuator
(3)S216
(4)Radio C2
(5)Radio C1
(6)Ambient Light Sensor (CJ3)/Ambient Light/Sunload Sensor Assembly (CJ2)
(7)Mode Actuator
(8)Air Temperature Sensor - Lower Left (CJ2)
(9)Defrost Actuator
(10)Windsheild Wiper motor
(11)Speaker - LF I/P (UQA)
(12)C225 (JF4)
(13)Turn Signal/Hazard Flasher Module
(14)Stop Lamp Switch
(15)Accelerator Pedal Position (APP) Sensor
(16)S239
(17)S202
(18)S217
(19)Air Temperature Actuator - Right
(20)Splice Pack SP205
(21)S211
(22)S230
(23)Air Temperature Sensor - Lower Right (CJ2)
(24)Splice Pack SP201
(25)Air Temperature Actuator - Right
(26)S271 (CJ2)
(27)Blower Motor Resistor Assembly (CJ3)/Blower Motor Control Module (CJ2)
(28)S250 (CJ3)
(29)S201 (CJ3)
(30)Inflatable Restraint I/P Module
Figure 13:

I/P Harness Routing - Front of the I/P
Object Number: 1702855 Size: MF
(1)Instrument Panel Cluster
(2)Transfer Case Shift Control Switch (NP8)
(3)Air Temperature Sensor - Upper Left (CJ2)
(4)HVAC Control Module C2
(5)Air Temperature Sensor - Upper Right (CJ2)
(6)HVAC Control Module C1
(7)X221 (U42/U2K)
(8)X202
(9)X203
(10)Auxiliary Power Outlet - Front
(11)Cigar Lighter
(12)X300
(13)X307
(14)Inflatable Restraint Sensing and Diagnostic Module (SDM)
(15)J220
(16)Rollover Sensor
(17)X304
(18)Fuse Block - Rear X1
(19)Body Control Module (BCM) X1
(20)Body Control Module (BCM) X2
(21)J203
(22)J320
(23)Rear Window Wiper/Washer Switch
(24)X201
(25)X275
(26)Data Link Connector (DLC)
(27)Transfer Case Shift Control Module X2 (4WD)
(28)Transfer Case Shift Control Module X3 (4WD)
(29)Headlamp Switch X1
(30)Headlamp Switch X2
Figure 14:

Infotainment Jumper Harness Routing (U42/U2K)
Object Number: 1549268 Size: LF
(1)Digital Radio Receiver (U2K)
(2)C221 (U42/U2K)
(3)C220 (U42)
Figure 15:

Steering Wheel Harness Routing (STW)
Object Number: 1549269 Size: LF
(1)Steering Wheel Control Switch Assembly - Upper Left
(2)C277
(3)Steering Wheel Control Switch Assembly - Upper Right
(4)Steering Wheel Control Switch Assembly - Lower Right
(5)Steering Wheel Control Switch Assembly - Lower Left
Figure 16:

Electronic Adjustable Pedals Harness Routing (JF4)
Object Number: 1545399 Size: MF
(1)Electronic Adjustable Pedals (EAP) Relay
(2)X225
(3)Electronic Adjustable Pedals (EAP) Assembly
Figure 17:

Body Harness Routing
Object Number: 1549270 Size: LF
(1)Splice Pack SP306
(2)X374 (BAE)
(3)X362 (BAE)
(4)Center High Mounted Stop Lamp (CHMSL)
(5)X900
(6)J401
(7)G401
(8)Tail Lamp Circuit Board - Left
(9)X304
(10)Inflatable Restraint Roof Rail Module - Left
(11)Fuse Block - Rear X2
(12)C700
(13)Air Temperature Sensor Assembly - Inside (CJ2)
(14)G302
(15)X302
(16)X317
(17)X500
(18)X311
(19)X306
(20)X314
(21)X318
(22)X203 (ASF)
(23)X202
(24)X220 (U42)
(25)X600
(26)X310
(27)X303
(28)G303
(29)C800
(30)Vehicle Communication Interface Module (VCIM) (UE1) X1
(31)Vehicle Communication Interface Module (VCIM) (UE1) X2
(32)Inflatable Restraint Roof Rail Module - Right
(33)J402
(34)Audio Amplifier (UQA) X2
(35)Audio Amplifier (UQA) X1
(36)Tail Lamp Circuit Board - Right
(37)G402
Figure 18:

Headliner Harness Routing
Object Number: 1775171 Size: MF
(1)Cargo Lamp
(2)X308 (CF5)
(3)Courtesy/Reading Lamp - Center
(4)J390
(5)J331
(6)X305
(7)J322
(8)Vanity Mirror Lamp - Right (DH2)
(9)Inside Rearview Mirror
(10)Vanity Mirror Lamp - Left (DH2)
(11)J312
(12)X306
(13)Fuse Block - Rear X3
Figure 19:

Seat Belt Pretensioner Harness Routing - Left
Object Number: 1549277 Size: LF
(1)Seat Belt Pretensioner - Left
(2)X317
Figure 20:

Seat Belt Pretensioner Harness Routing - Right
Object Number: 1549280 Size: LF
(1)Seat Belt Pretensioner - Right
(2)X318
Figure 21:

Floor Console Harness Routing
Object Number: 1549283 Size: LF
(1)Auxiliary Power Outlet - Console
(2)HVAC Control Module - Auxiliary
(3)J307
(4)X307
(5)Console Mode Actuator - Auxiliary
Figure 22:

Left Front Door Harness Routing
Object Number: 1549286 Size: LF
(1)X500
(2)Driver Door Module (DDM) X2
(3)Door Latch Assembly - Driver X1
(4)Door Latch Assembly - Driver X3 (UA2/UA6)
(5)Door Latch Assembly - Driver X2
(6)Inflatable Restraint Side Impact Sensor (SIS) - Left (ASF)
(7)Window Motor - Driver
Figure 23:

Right Front Door Harness Routing
Object Number: 1549288 Size: LF
(1)Door Latch Assembly - Passenger X1
(2)Door Latch Assembly - Passenger X2
(3)Inflatable Restraint Side Impact Sensor (SIS) - Right (ASF)
(4)Window Motor - Front Passenger
(5)Front Passenger Door Module (FPDM) X1
(6)X600
Figure 24:

Left Rear Door Harness Routing
Object Number: 1549290 Size: LF
(1)X700
(2)Window Switch - LR
(3)Door Latch Assembly - LR X1
(4)Door Latch Assembly - LR X2
(5)Speaker - LR Door
(6)Window Motor - LR
Figure 25:

Right Rear Door Harness Routing
Object Number: 1549291 Size: LF
(1)Door Latch Assembly - RR X1
(2)Window Switch - RR
(3)Window Motor - RR
(4)X800
(5)Speaker - RR Door
(6)Door Latch Assembly - RR X2
Figure 26:

Liftgate Harness Routing
Object Number: 1703424 Size: LF
(1)Rear Window Wiper Motor
(2)X905 (C49)
(3)Liftglass Ajar Switch
(4)X900
(5)X904 (C49)
(6)J901
(7)Liftgate Module (LGM) C3
(8)Liftgate Module (LGM) C2
(9)Liftgate Module (LGM) C1
(10)X901
(11)Liftgate Latch Assembly X2
(12)Liftgate Latch Assembly X1
Figure 27:

Rear Defogger Harness Routing (C49)
Object Number: 1549309 Size: MF
(1)Rear Window Defogger Grid X1
(2)X905
(3)X904
(4)Rear Window Defogger Grid X2