2007 Chevrolet TrailBlazer

2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

2007 GENERAL MOTORS

Envoy, Rainier & TrailBlazer

BUZZERS, RELAYS & TIMERS

BUZZERS, RELAYS & TIMERS LOCATION
Component Location
A/C Relay (4.2L) On underhood fuse block. See Fig. 114.
A/C Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
AIR SOL Relay In underhood fuse block. See Fig. 114.
EAP Relay (4.2L) In underhood fuse block. See Fig. 114.
EAP Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
Electronic Adjustable Pedals (EAP) Relay Left side of dash, on pedal assembly. See Fig. 20.
FAN Relay (4.2L) In underhood fuse block. See Fig. 114.
FAN Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
FOG LAMP Relay (4.2L) On underhood fuse block. See Fig. 114.
FOG LAMP Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
FUEL PUMP Relay (4.2L) On underhood fuse block. See Fig. 114.
FUEL PUMP Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
HDM Relay (4.2L) In underhood fuse block. See Fig. 114.
HDM Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
HEADLAMP WPR Relay (4.2L) In underhood fuse block. See Fig. 114.
HEADLAMP WPR Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
HI HEADLAMP Relay (4.2L) In underhood fuse block. See Fig. 114.
HI HEADLAMP Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
HORN Relay (4.2L) On underhood fuse block. See Fig. 114.
HORN Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
LOCK Relay In rear fuse block. See Fig. 128.
PARK LP Relay In rear fuse block. See Fig. 128.
PWR/TRN Relay (4.2L) In underhood fuse block. See Fig. 114.
PWR/TRN Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
REAR/WPR Relay (4.2L) On underhood fuse block. See Fig. 114.
REAR/WPR Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
RR FOG LP Relay In rear fuse block. See Fig. 128.
Secondary Air Injection (AIR) Pump Relay Left front of chassis. See Fig. 36.
STRTR Relay (4.2L) On underhood fuse block. See Fig. 114.
STRTR Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.
UNLOCK Relay On rear fuse block. See Fig. 128.
WSW Relay (4.2L) On underhood fuse block. See Fig. 114.
WSW Relay (5.3L/6.0L) In underhood fuse block. See Fig. 127.

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 2007 Chevrolet TrailBlazer
2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

CIRCUIT PROTECTION DEVICES

CIRCUIT PROTECTION DEVICES LOCATION
Component Location
Rear Fuse Block Below left rear seat. See Fig. 102.
Underhood Fuse Block Above left front wheelwell. See Fig. 1.

CONTROL UNITS
CONTROL UNITS LOCATION
Component Location
Blower Motor Control Module Below right side of dash. See Fig. 63.
Beneath left rear seat, on rear fuse block. See Fig.
Body Control Module (BCM)
102.
Driver Door Module (DDM) Below driver's door switch panel.
On inner left frame rail, beside transmission. See
Electronic Brake Control Module (EBCM)
Fig. 132.
Engine Control Module (ECM) Near lower left front of engine. See Fig. 77.
Front Passenger Door Module (FPDM) Below front passenger door switch panel.
HVAC Control Module (Automatic A/C) Center of dash. See Fig. 86.
HVAC Control Module-Auxiliary Under lower console. See Fig. 68.
HVAC Control Module (Manual A/C) Center of dash. See Fig. 8.
Inflatable Restraint Front Passenger Presence
Under passenger seat. See Fig. 90.
System (PPS) Module
Inflatable Restraint I/P Module Left side of dash. See Fig. 17.
Inflatable Restraint Roof Rail Module - Left In roof above driver door.
Inflatable Restraint Roof Rail Module - Right In roof, above front passenger's door.
Inflatable Restraint Sensing & Diagnostic Module
Below rear of center console. See Fig. 19.
(SDM)
Inflatable Restraint Steering Wheel Module In steering wheel. See Fig. 18.
Liftgate Module (LGM) In center of liftgate. See Fig. 23.
Memory Seat Module (Driver) Below left front seat. See Fig. 99.
Powertrain Control Module (PCM) On upper left side of engine. See Fig. 80.
Regulated Voltage Control Module Behind battery. See Fig. 62.
Theft Deterrent Control Module In steering column. See Fig. 106.
Transfer Case Shift Control Module Behind lower left side of dash. See Fig. 107.
Transmission Control Module (TCM) Left front of engine. See Fig. 108.
Turn Signal/Hazard Flasher Module Behind lower left side of dash. See Fig. 70.
Vehicle Communication Interface Module (VCIM) Under right rear seat. See Fig. 21.

MOTORS
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 2007 Chevrolet TrailBlazer
2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

MOTORS LOCATION
Component Location
Air Suspension Compressor Assembly Behind right rear wheelwell. See Fig. 10.
Air Temperature Actuator (Left) Below left center of dash. See Fig. 6.
Air Temperature Actuator (Right) Behind right center of dash. See Fig. 6.
Automatic Transmission Shift Lock Actuator In floor shifter. See Fig. 14.
Blower Motor Below right side of dash. See Fig. 63.
Console Mode Actuator (Auxiliary) Under lower console. See Fig. 68.
Cooling Fan Front of engine. See Fig. 69.
Defrost Actuator On upper dash carrier. See Fig. 6.
Door Latch Assembly (Driver) In left front door. See Fig. 72.
Door Latch Assembly (Left Rear) In left rear door. See Fig. 74.
Door Latch Assembly (Passenger) In right front door. See Fig. 73.
Door Latch Assembly (Right Rear) In right rear door. See Fig. 75.
Front Axle Actuator On inner flange of right front axle. See Fig. 11.
Fuel Pump & Sender Assembly Top of fuel tank. See Fig. 32.
Headlamp Leveling Actuator (Left) Behind left headlight. See Fig. 82.
Headlamp Leveling Actuator (Right) Behind right headlight. See Fig. 83.
Headlamp Washer Fluid Pump Right front of engine compartment. See Fig. 24.
Ignition Lock Cylinder Control Actuator In upper steering column. See Fig. 87.
Liftgate Latch Assembly In liftgate assembly. See Fig. 23.
Lumbar Horizontal Motor (Driver) In driver seat back. See Fig. 97.
Lumbar Horizontal Motor (Passenger) In passenger seat back. See Fig. 98.
Mode Actuator Behind upper left center of dash. See Fig. 6.
Rear Blower Motor Under center of dash. See Fig. 37.
Rear Window Washer Fluid Pump On washer fluid reservoir. See Fig. 24.
Rear Window Wiper Motor Inside tailgate. See Fig. 23.
Recirculation Actuator On right side of dash. See Fig. 7.
Seat Front Vertical Motor (Driver) Under driver seat. See Fig. 92.
Seat Front Vertical Motor (Passenger) Under passenger seat. See Fig. 93.
Seat Horizontal Motor (Driver) Under driver seat. See Fig. 92.
Seat Horizontal Motor (Passenger) Under passenger seat. See Fig. 93.
Seat Rear Vertical Motor (Driver) Under driver seat. See Fig. 92.
Seat Rear Vertical Motor (Passenger) Under passenger seat. See Fig. 93.
Seat Recline Motor (Driver) Under driver seat. See Fig. 92.
Seat Recline Motor (Passenger) Under passenger seat. See Fig. 93.
Left front of chassis, near electronic brake control
Secondary Air Injection (AIR) Pump
module. See Fig. 36.
Starter (4.2L) Left rear of engine. See Fig. 33.
Starter (5.3L/6.0L) Right side of engine. See Fig. 29.
Above headliner, at rear of sun roof assembly. See
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 2007 Chevrolet TrailBlazer
2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Sunroof Motor Fig. 104.

Transfer Case Encoder Motor Part of transfer case. See Fig. 46.
Window Motor (Driver) In left front door. See Fig. 72.
Window Motor (Front Passenger) In right front door. See Fig. 73.
Window Motor (Left Rear) In left rear door. See Fig. 74.
Window Motor (Right Rear) In right rear door. See Fig. 75.
Windshield Washer Fluid Pump On washer fluid reservoir. See Fig. 24.
Windshield Wiper Motor On upper center of firewall. See Fig. 25.

SENDING UNITS & SENSORS

SENDING UNITS & SENSORS LOCATION
Component Location
Accelerator Pedal Position (APP) Sensor Above accelerator pedal, on bracket. See Fig. 20.
On high pressure line, near A/C compressor. See
A/C Refrigerant Pressure Sensor
Fig. 56.
On frame rail, near left rear suspension arm. See
Air Suspension Sensor-LR
Fig. 10.
On frame rail, near right rear suspension arm. See
Air Suspension Sensor-RR
Fig. 10.
Air Temperature Sensor (Inside) In left "B" pillar. See Fig. 57.
Air Temperature Sensor (Lower Left) Left of lower console, in air duct. See Fig. 60.
Air Temperature Sensor (Lower Right) In right lower console, in air duct. See Fig. 58.
Air Temperature Sensor (Upper Left) Left center of dash, in air duct. See Fig. 59.
Air Temperature Sensor (Upper Right) Right center of dash, in air duct. See Fig. 59.
Ambient Air Temperature Sensor On left center of radiator support. See Fig. 9.
Ambient Light Sensor On top center of dash. See Fig. 61.
On top center of dash, near base of windshield. See
Ambient Light/Sun Load Sensor
Fig. 61.
Brake Booster Vacuum Sensor On power brake booster. See Fig. 30.
Camshaft Position (CMP) Sensor (4.2L) On right front of engine block. See Fig. 65.
Camshaft Position (CMP) Sensor (5.3L/6.0L) At bottom front of engine. See Fig. 66.
On left rear of engine block, below starter. See Fig.
Crankshaft Position (CKP) Sensor (4.2L)
33.
At right rear of engine, adjacent to starter. See Fig.
Crankshaft Position (CKP) Sensor (5.3L/6.0L)
29.
On left side of frame, at front of vehicle. See Fig.
Electronic Frontal Sensor (EFS) - Left
76.
On right side of frame, at front of vehicle. See Fig.
Electronic Frontal Sensor (EFS) - Right
76.
Engine Coolant Temperature (ECT) Sensor (4.2L) Lower right rear of engine block. See Fig. 79.
Engine Coolant Temperature (ECT) Sensor On left front of engine block, near generator. See
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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

(5.3L/6.0L) Fig. 78.

Engine Oil Pressure (EOP) Sensor At rear of engine.
Fuel Tank Pressure (FTP) Sensor At top left rear of fuel tank. See Fig. 32.
In left bank exhaust pipe, ahead of catalytic
Heated Oxygen Sensor Bank 1 Sensor 1 (5.3L/6.0L)
converter. See Fig. 84.
In left bank of exhaust pipe, behind catalytic
Heated Oxygen Sensor Bank 1 Sensor 2 (5.3L/6.0L)
converter. See Fig. 84.
In right bank OF exhaust pipe, ahead of catalytic
Heated Oxygen Sensor Bank 2 Sensor 1 (5.3L/6.0L)
converter. See Fig. 84.
In right bank of exhaust pipe, behind catalytic
Heated Oxygen Sensor Bank 2 Sensor 2 (5.3L/6.0L)
converter. See Fig. 84.
On exhaust manifold, on right side of engine. See
Heated Oxygen Sensor (HO2S) 1 (4.2L)
Fig. 65.
Downstream of catalytic converter, on exhaust pipe.
Heated Oxygen Sensor (HO2S) 2 (4.2L)
See Fig. 35.
Inclination Sensor Under right rear seat. See Fig. 89.
Inflatable Restraint Front Passenger Presence
Under passenger seat. See Fig. 90.
System (PPS) Sensor
Inflatable Restraint Passenger Seat Belt Tension
Integral to passenger seat bet retractor. See Fig. 91.
Retractor Sensor
Inflatable Restraint Seat Position Sensor (SPS) -
On left front outboard seat track. See Fig. 92.
Left
Inflatable Restraint Seat Position Sensor (SPS) -
On right front outboard seat track. See Fig. 93.
Right
Inflatable Restraint Side Impact Sensor (SIS)-Left In left front door, near door latch. See Fig. 94.
Inflatable Restraint Side Impact Sensor (SIS)-Right In right front door, near door latch. See Fig. 95.
Input Speed Sensor (ISS) Assembly Inside automatic transmission. See Fig. 52.
Intrusion Sensor 1 Part theft deterrent module.
Intrusion Sensor 2 Part of theft deterrent module.
Knock Sensor (KS) 1 - Left Lower left side of engine. See Fig. 96.
Knock Sensor (KS) 2 - Right Right side of engine block. See Fig. 29.
Knock Sensor 1 - Front (4.2L) On lower left front of engine block. See Fig. 33.
Knock Sensor 2 - Rear (4.2L) On lower left rear of engine block. See Fig. 33.
Lumbar Horizontal Position Sensor (Driver) In driver seat back. See Fig. 97.
Manifold Absolute Pressure (MAP) Sensor (4.2L) On upper left side of engine. See Fig. 79.
Manifold Absolute Pressure (MAP) Sensor
On top of engine. See Fig. 26.
(5.3L/6.0L)
Mass Airflow (MAF)/Intake Air Temperature (IAT)
In air intake duct. See Fig. 65.
Sensor (4.2L)
Mass Airflow (MAF)/Intake Air Temperature (IAT)
In air intake duct. See Fig. 28.
Sensor (5.3L/6.0L)
Passlock Sensor In steering column.

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Propshaft Speed Sensor - Front On left front of transfer case. See Fig. 101.
Propshaft Speed Sensor - Rear On right rear of transfer case. See Fig. 101.
Rollover Sensor Under Middle rear floor carpet. See Fig. 102.
Seat Position Sensor (Front) Under driver seat. See Fig. 92.
Seat Position Sensor (Horizontal) Under driver seat. See Fig. 92.
Seat Position Sensor (Rear) Under driver seat. See Fig. 92.
Seat Position Sensor (Recline) Under driver seat. See Fig. 92.
Steering Wheel Speed/Position Sensor At base of steering column.
VSS Sensor On left rear of transfer case. See Fig. 16.
Wheel Speed Sensor-LF On left front wheel hub assembly. See Fig. 13.
Wheel Speed Sensor-RF On right front wheel hub assembly. See Fig. 13.
Wheel Speed Sensor (WSS) - LR Attached to left rear wheel hub.
Wheel Speed Sensor (WSS) - RR Attached right rear wheel hub.
Yaw Rate & Lateral Acceleration Sensor Below front passenger's seat. See Fig. 110.

SOLENOIDS & SOLENOID VALVES

SOLENOIDS & SOLENOID VALVES LOCATION
Component Location
A/C Compressor Clutch (4.2L) On A/C compressor. See Fig. 53.
A/C Compressor Clutch (5.3L/6.0L) On A/C Compressor. See Fig. 54.
Camshaft Actuator Solenoid Assembly On right front of cylinder head. See Fig. 65.
Evaporative Emission (EVAP) Canister Purge
Lower Left Side Of Engine. See Fig. 33.
Solenoid (4.2L)
Evaporative Emission (EVAP) Canister Purge
On top of engine. See Fig. 26.
Solenoid (5.3L/6.0L)
Evaporative Emission (EVAP) Canister Vent
At rear of fuel tank. See Fig. 32.
Solenoid
Fuel Injector 1 (4.2L) Top of engine. See Fig. 34.
Fuel Injector 1 (5.3L/6.0L) Upper left side of engine. See Fig. 26.
Fuel Injector 2 (4.2L) Top of engine. See Fig. 34.
Fuel Injector 2 (5.3L/6.0L) Upper right side of engine. See Fig. 27.
Fuel Injector 3 (4.2L) Top of engine. See Fig. 34.
Fuel Injector 3 (5.3L/6.0L) Upper left side of engine. See Fig. 26.
Fuel Injector 4 (4.2L) Top of engine. See Fig. 34.
Fuel Injector 4 (5.3L/6.0L) Upper right side of engine. See Fig. 27.
Fuel Injector 5 (4.2L) Top of engine. See Fig. 34.
Fuel Injector 5 (5.3L/6.0L) Upper left side of engine. See Fig. 26.
Fuel Injector 6 (4.2L) Top of engine. See Fig. 34.
Fuel Injector 6 (5.3L/6.0L) Upper right side of engine. See Fig. 27.
Fuel Injector 7 (5.3L/6.0L) Upper left side of engine. See Fig. 26.

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fuel Injector 8 (5.3L/6.0L) Upper right side of engine. See Fig. 27.
Inside automatic transmission assembly. See Fig.
Pressure Control (PC) Solenoid Valve
52.
Secondary Air Injection (AIR) Solenoid Upper right side of engine. See Fig. 103.
Torque Converter Clutch Pulse Width Modulation Inside automatic transmission assembly. See Fig.
(TCC PWM) Solenoid Valve 52.
Inside automatic transmission valve body. See Fig.
Torque Converter Clutch (TCC) Solenoid Valve
52.
Torque Converter Clutch (TCC) Solenoid Valve Inside transmission assembly. See Fig. 52.
Inside automatic transmission assembly. See Fig.
1-2 Shift Solenoid (SS) Valve
52.
Inside automatic transmission assembly. See Fig.
2-3 Shift Solenoid (SS) Valve
52.
Inside automatic transmission assembly. See Fig.
3-2 Shift Solenoid (SS) Valve Assembly
52.

SWITCHES
SWITCHES LOCATION
Component Location
At right rear of engine compartment, on
A/C Low Pressure Switch
accumulator. See Fig. 55.
On right side of cargo area, on trim panel. See Fig.
Air Suspension Inflator Switch
10.
Automatic Transmission Fluid Pressure (TFP) Inside automatic transmission assembly. See Fig.
Manual Valve Position Switch 52.
On brake master cylinder fluid reservoir. See Fig.
Brake Fluid Level Switch
64.
Engine Oil Pressure (EOP) Switch At lower right of engine block. See Fig. 65.
Horn Switch Under horn pad. See Fig. 88.
Ignition Key Alarm Switch In steering column. See Fig. 87.
Ignition Switch In steering column. See Fig. 87.
Intrusion Sensor Disable Switch Part of theft deterrent module.
Liftgate Ajar Switch In liftgate. See Fig. 23.
Lower Left Steering Wheel Control Switch
On steering wheel. See Fig. 88.
Assembly (STW)
Lower Right Steering Wheel Control Switch
On steering wheel. See Fig. 88.
Assembly (STW)
Park Brake Switch On parking brake assembly. See Fig. 12.
Park/Neutral Position (PNP) Switch On lower left side of transmission. See Fig. 100.
Stop Lamp Switch On brake pedal assembly. See Fig. 31.
Turn Signal/Multifunction Switch On steering column. See Fig. 88.

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Mounted on windshield washer fluid reservoir. See

Windshield Washer Fluid Level Switch
Fig. 24.

MISCELLANEOUS
MISCELLANEOUS LOCATION
Component Location
On right side of cargo area, behind trim panel. See
Audio Amplifier
Fig. 22.
Battery (4.2L) Left front of engine compartment. See Fig. 62.
Battery (5.3L/6.0L) Left front of engine compartment. See Fig. 131.
Below right side of dash, near blower motor. See
Blower Motor Resistor Assembly
Fig. 130.
Cellular Microphone In overhead console. See Fig. 67.
Data Link Connector (DLC) On bottom left side of dash. See Fig. 70.
Digital Radio Receiver Right side of dash, behind glove box. See Fig. 71.
Electronic Adjustable Pedal (EAP) Assembly On pedals assembly. See Fig. 20.
Generator (4.2L) Left front of engine (4.2L). See Fig. 80.
Generator (5.3L/6.0L) Top front of engine. See Fig. 81.
Heated Seat Element (Driver Seat Back) Behind seat back upholstery.
Heated Seat Element (Driver Seat Cushion) Behind seat cushion upholstery.
Heated Seat Element (Passenger Seat Back) Behind seat back upholstery.
Heated Seat Element (Passenger Seat Cushion) Behind seat cushion upholstery.
Horn Assembly Lower left front of radiator support. See Fig. 85.
Ignition Coil 1 (4.2L) Top of engine. See Fig. 34.
On top of valve cover, above respective cylinder.
Ignition Coil 1 (5.3L/6.0L)
See Fig. 26.
Ignition Coil 2 (4.2L) Top of engine. See Fig. 34.
On top of valve cover, above respective cylinder.
Ignition Coil 2 (5.3L/6.0L)
See Fig. 27.
Ignition Coil 3 (4.2L) Top of engine. See Fig. 34.
On top of valve cover, above respective cylinder.
Ignition Coil 3 (5.3L/6.0L)
See Fig. 26.
Ignition Coil 4 (4.2L) Top of engine. See Fig. 34.
On top of valve cover, above respective cylinder.
Ignition Coil 4 (5.3L/6.0L)
See Fig. 27.
Ignition Coil 5 (4.2L) Top of engine. See Fig. 34.
On top of valve cover, above respective cylinder.
Ignition Coil 5 (5.3L/6.0L)
See Fig. 26.
Ignition Coil 6 (4.2L) Top of engine. See Fig. 34.
On top of valve cover, above respective cylinder.
Ignition Coil 6 (5.3L/6.0L)
See Fig. 27.
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On top of valve cover, above respective cylinder.

Ignition Coil 7 (5.3L/6.0L)
See Fig. 26.
On top of valve cover, above respective cylinder.
Ignition Coil 8 (5.3L/6.0L)
See Fig. 27.
Inflatable Restraint Steering Wheel Module Coil In steering wheel column.
Rear Blower Resistor Attached to rear blower motor. See Fig. 37.
Under left front of seat, part of retractor. See Fig.
Seat Belt Pretensioner - Left
97.
Under right front of seat, part of retractor. See Fig.
Seat Belt Pretensioner - Right
98.
Attached to rear frame, above spare tire. See Fig.
Theft Deterrent Alarm
105.
Throttle Body (4.2L) Front of intake duct. See Fig. 79.
Throttle Body (5.3L/6.0L) Front of intake duct. See Fig. 27.
Trailer Connector Under center of rear bumper. See Fig. 129.
Valve Lifter Oil Manifold (VLOM) Assembly At top rear of engine. See Fig. 109.

CONNECTORS
CONNECTORS LOCATION
Component Location
I/P harness to engine harness, in underhood
C100 (Black, 12 Pin)
compartment, to left of engine. See Fig. 38.
I/P harness to chassis harness, in underhood
C101 (Black, 38 Pin) compartment, to right of underhood fuse block. See
Fig. 38.
C102 (Gray, 4 Pin) Near left headlight assembly. See Fig. 39.
C103 (Gray, 4 Pin) Near right headlight assembly. See Fig. 40.
C104 (Black, 8 Pin) At rear of engine, near coil No. 6. See Fig. 111.
Forward lamp harness to I/P harness, underhood
C105 (Black, 10 Pin) compartment, near underhood fuse block. See Fig.
38.
C106 (Black, 2 Pin) I/P harness to chassis harness.
I/P harness to engine harness, in underhood
C107 (Black, 38 Pin)
compartment, near C101. See Fig. 38.
In coils harness to engine harness, on top of right
C108 (Gray, 7 Pin)
bank valve cover. See Fig. 27.
In coils harness to engine harness, on top of left
C109 (Gray, 7 Pin)
bank valve cover. See Fig. 26.
Left front of engine block, below camshaft position
C110 (Black, 3 Pin)
sensor. See Fig. 66.
I/P harness to body harness, in rear floor area, near
C111 (Black, 6 Pin)
C304.
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C118 (Black, 6 pin) On upper left of fan shroud. See Fig. 39.
Engine harness to automatic transmission harness,
C175 (20 Pin)
on right side of transmission. See Fig. 15.
Steering column harness to I/P harness, lower part
C201 (Black, 48 Pin)
of steering column. See Fig. 112.
I/P harness to body harness, lower right side of
C202 (Black, 4 Pin)
dash. See Fig. 112.
I/P harness to body harness, lower right side of
C203 (Yellow, 4 Pin)
dash. See Fig. 112.
I/P harness to auxiliary blower motor harness,
C204 (Black, 4 Pin)
below center of dash. See Fig. 37.
C225 (Black, 10 pin) On brake pedal assembly. See Fig. 20.
C275 (Yellow, 4 Pin) At steering column. See Fig. 112.
C277 (Black, 8 Pin) Under horn pad. See Fig. 88.
C300 (Black, 8 Pin) Right of floor shifter. See Fig. 112.
I/P harness to body harness, under carpet, rear floor
C304 (Blue, 40 Pin)
area. See Fig. 112.
Overhead console harness to headliner harness,
C305 (Black, 16 Pin)
inside upper console. See Fig. 113.
Body harness to headliner harness, under carpet, at
C306 (Black, 16 Pin)
rear floor area. See Fig. 112.
C307 (Gray, 18 Pin) Beneath lower console. See Fig. 51.
Headliner harness to sun roof harness, above left
C308 (Black, 6 Pin)
rear door. See Fig. 113.
Chassis harness to engine harness, near transfer
C310 (Black, 2 Pin)
case. See Fig. 101.
Body harness to seat harness, lower front of driver's
C311 (Black, 4 Pin)
seat. See Fig. 50.
Body harness to seat harness, lower front of
C314 (Black, 16 Pin)
passenger seat. See Fig. 50.
C317 (Yellow, 2 Pin) Under driver's seat pretensioner. See Fig. 115.
C318 (Yellow, 2 Pin) Under passenger's seat pretensioner. See Fig. 116.
Body harness to left front door harness, at midpoint
C500 (Black, 12 Pin)
of leading edge of door. See Fig. 117.
Body harness to right front door harness, at
C600 (Black, 12 Pin)
midpoint of leading edge of door. See Fig. 118.
Body harness to left rear door harness, at midpoint
C700 (Natural, 17 Pin)
of leading edge of door. See Fig. 74.
Body harness to right rear door harness, at midpoint
C800 (Natural, 17 Pin)
of leading edge of door. See Fig. 75.
Body harness to liftgate harness, at top of liftgate.
C900 (Black, 6 Pin)
See Fig. 23.
C901 (Light Gray, 2 Pin) Liftgate harness to license lamp harness, inside
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liftgate. See Fig. 23.

C904 (Black, 1 pin) At top left of liftgate. See Fig. 23.
C905 (Black, 1 pin) At top right of liftgate. See Fig. 23.

GROUNDS
GROUNDS LOCATION
Component Location
Left side of underhood compartment, near front of
G101
underhood fuse block. See Fig. 119.
Left side of underhood compartment, near rear of
G102
underhood fuse block. See Fig. 2.
Left front of underhood compartment, on left side of
G103
radiator support. See Fig. 40.
On underside of hood, near underhood compartment
G104
lamp. See Fig. 2.
In underhood compartment, on firewall, near I/P
G105
harness pass-through. See Fig. 2.
G106 On engine side of left front wheelwell. See Fig. 119.
G107 (4.2L) On lower left side of engine. See Fig. 121.
G107 (5.3L/6.0L) On lower left side of engine. See Fig. 120.
G108 (4.2L) On lower left side of engine. See Fig. 121.
G108 (5.3L/6.0L) On lower left side of engine. See Fig. 120.
G109 (4.2L) On lower left side of engine. See Fig. 121.
G109 (5.3L/6.0L) On lower left side of engine. See Fig. 122.
G110 (4.2L) On lower left side of engine. See Fig. 121.
G110 (5.3L/6.0L) On lower left side of engine. See Fig. 123.
Ground splice pack near, right front of lower
G201
console.
G302 On lower left "B" pillar. See Fig. 3.
G303 On lower right "B" pillar.
On outside of left frame rail, near electronic brake
G304
control module. See Fig. 4.
On outside of left frame rail, near fuel tank. See Fig.
G305
5.
G306 On body panel, rear of left rear door. See Fig. 124.
G401 On lower left "D" pillar. See Fig. 125.
G402 On lower right "D" pillar.
On left side of rear frame crossmember. See Fig.
G403
126.

SPLICES
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SPLICES LOCATION
Component Location
SP201 At lower right front of lower console. See Fig. 48.
Behind left of dash, near headlight switch
SP205
connector. See Fig. 48.
SP306 In body harness, under right rear seat. See Fig. 49.
In engine harness, 10 cm from breakout to ECM.
S100
See Fig. 42.
In engine harness, 4 cm from breakout to C107. See
S101 (5.3L/6.0L)
Fig. 44.
In engine harness, 22 cm before breakout to MAP
S102
sensor. See Fig. 43.
In forward lamp harness, 8 cm from rear washer
S103
pump motor breakout. See Fig. 40.
In forward lamps harness, 6 cm before breakout to
S104 right side marker, cornering & park lamps. See Fig.
40.
In engine harness, 10 cm from breakout to C107.
S105
See Fig. 44.
In forward lamps harness, 5.5 cm before breakout to
S106 left side marker, cornering & park lamps. See Fig.
40.
In forward lamp harness, 9 cm from breakout to left
S107
front fog lamp. See Fig. 40.
In ignition coil jumper harness, 5 cm from breakout
S108
to C108.
In ignition coil jumper harness, 5 cm from breakout
S109
to C109.
S111 In fuel injector harness.
In engine harness, 5 cm from breakout to C109. See
S112
Fig. 41.
In forward lamp harness, 19.5 cm from windshield
S113
washer fluid pump breakout. See Fig. 40.
In I/P harness, 8.5 cm from C100 breakout. See Fig.
S117
38.
In ignition coil jumper harness, 5 cm from breakout
S118
to C108.
In ignition coil jumper harness, 5 cm from breakout
S119
to C109.
In ignition coil jumper harness, 5 cm from breakout
S128
to C108.
In ignition coil jumper harness, 5 cm from breakout
S129
to C109.
S133 In automatic transmission.
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S134 In automatic transmission.

In I/P harness, 4 cm from breakout to inflatable
S201
restraint I/P module. See Fig. 48.
I/P harness, 16.5 cm from steering column
S202
connector breakout. See Fig. 48.
In I/P harness, 5 cm from breakout to rollover
S203
sensor. See Fig. 112.
In chassis harness, 8 CM from breakout to
S205
electronic brake control module.
In I/P harness, 16 cm from SP201 breakout. See
S211
Fig. 48.
In I/P harness, 15.5 cm from recirculation actuator
S216
connector. See Fig. 47.
In I/P harness, 5 cm from mode motor breakout. See
S217
Fig. 48.
In I/P harness, 33.5 cm before breakout to inflatable
S220
restraint sensing & diagnostic module. See Fig. 112.
S226 In steering column harness.
In I/P harness, 5 cm from SP201 breakout. See Fig.
S230
48.
In I/P harness, 10 cm from breakout to steering
S232
wheel coils.
In I/P harness, above dash left lower panel, 11 cm
S239
from steering column breakout. See Fig. 48.
In I/P harness, 33 cm from blower motor resistor
S250
assembly. See Fig. 48.
In I/P harness, 14.5 cm from dash compartment
S271
lamp breakout. See Fig. 48.
In body harness 5 cm from main harness breakout
S302
for C700. See Fig. 50.
In body harness 5 cm from main harness breakout
S303
for C800. See Fig. 50.
In driver seat main power harness, 5 cm from
S304
breakout memory seat module connector C1.
In driver seat main power harness, 7 cm from
S305
breakout memory seat module connector C1.
In chassis harness, 13 cm back from breakout to fuel
S306
pump & sender assembly. See Fig. 45.
In floor console harness, 9 cm from breakout to
S307
auxiliary mode actuator. See Fig. 51.
In passenger seat harness, 15 cm from breakout to
S308
C314.
In body harness, 9 cm from breakout to C314. See
S310
Fig. 50.
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In driver's seat main power harness, 4.5 cm from

S311
lumbar switch breakout.
In main headliner harness, 80 cm from C308
S312
breakout. See Fig. 113.
Driver's seat motor harness, 17 cm from seat module
S313
connector C2.
Driver's seat motor harness, 24 cm from seat module
S314
connector C2.
S315 (W/ Memory) In driver seat harness, 11.5 cm from C311.
In passenger seat main power harness, 25 cm back
S316
from lumbar adjuster switch connector.
In passenger seat main power harness, 14.5 cm back
S317 (W/ Heat)
from lumbar adjuster switch connector.
In passenger seat main power harness, 5 cm from
S317 (W/O Heat)
breakout to lumbar adjuster switch connector.
In driver's seat harness, 7 cm from breakout to body
S318
connector.
In passenger seat harness, 7 cm from breakout to
S319
body connector.
In I/P harness, 18 cm from automatic transmission
S320
shift lever connector breakout. See Fig. 112.
In I/P harness channel between rear seat & console,
S321
32 cm forward from C301/C304 breakout.
In headliner harness, 16 cm from ISRVM breakout,
S322
toward right sun shade mirror lamp. See Fig. 113.
In driver seat harness, 6.5 cm from breakout to
S327
driver cushion heated seat element.
S330 In overhead console harness.
In headliner harness, 17 cm from left sun shade
S331
mirror lamp breakout, toward C305. See Fig. 113.
S332 In overhead console harness.
In headliner harness, 6.5 cm from breakout to left
S341
clearance lamp.
In chassis harness, 13 cm before breakout to fuel
S359
pump & sender assembly. See Fig. 46.
In body harness channel on rear floor, 6 cm to left
S362
of SP306. See Fig. 49.
In body harness channel on rear floor, 12 cm to left
S374
of SP306. See Fig. 49.
In headliner harness, 26 cm from left front
S390
dome/reading lamp. See Fig. 113.
In body harness, 7.5 cm from G401 breakout. See
S401
Fig. 49.
In body harness, 7.5 cm from G402 breakout. See
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S402 Fig. 50.

In chassis harness, 9.5 cm from breakout to right
S408
backup lamp. See Fig. 46.
In liftgate harness, 22 cm from liftgate module
S901
breakout. See Fig. 23.

COMPONENT LOCATION GRAPHICS

NOTE: Figures may show multiple component locations. Refer to appropriate table for
proper figure references.

Fig. 1: Underhood Fuse Block

Courtesy of GENERAL MOTORS CORP.

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Fig. 2: Left Rear Of Engine Compartment

Courtesy of GENERAL MOTORS CORP.

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Fig. 3: Left "B" Pillar

Courtesy of GENERAL MOTORS CORP.

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Fig. 4: Left Frame Rail

Courtesy of GENERAL MOTORS CORP.

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Fig. 5: Vehicle Frame

Courtesy of GENERAL MOTORS CORP.

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Fig. 6: Left & Right Instrument Panel Carrier

Courtesy of GENERAL MOTORS CORP.

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Fig. 7: Dash Panel Carrier

Courtesy of GENERAL MOTORS CORP.

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Fig. 8: Center Of Dash

Courtesy of GENERAL MOTORS CORP.

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Fig. 9: Right Front Of Vehicle

Courtesy of GENERAL MOTORS CORP.

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Fig. 10: Rear Frame & Underbody

Courtesy of GENERAL MOTORS CORP.

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Fig. 11: Right Front Of Engine (4.2L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 12: Center Floor Pan

Courtesy of GENERAL MOTORS CORP.

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Fig. 13: Front Hubs & Rotors

Courtesy of GENERAL MOTORS CORP.

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Fig. 14: Center Of Floor Pan

Courtesy of GENERAL MOTORS CORP.

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Fig. 15: Automatic Transmission

Courtesy of GENERAL MOTORS CORP.

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Fig. 16: Transfer Case

Courtesy of GENERAL MOTORS CORP.

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Fig. 17: Dash Assembly

Courtesy of GENERAL MOTORS CORP.

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Fig. 18: Steering Wheel Assembly

Courtesy of GENERAL MOTORS CORP.

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Fig. 19: Lower Console

Courtesy of GENERAL MOTORS CORP.

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Fig. 20: Lower Left Side Of Dash

Courtesy of GENERAL MOTORS CORP.

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Fig. 21: Rear Floor Panel

Courtesy of GENERAL MOTORS CORP.

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Fig. 22: Right Body Side Inner Lower Panel

Courtesy of GENERAL MOTORS CORP.

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Fig. 23: Liftgate

Courtesy of GENERAL MOTORS CORP.

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Fig. 24: Right Front Of Engine Compartment

Courtesy of GENERAL MOTORS CORP.

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Fig. 25: Center Rear Of Engine Compartment

Courtesy of GENERAL MOTORS CORP.

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Fig. 26: Upper Left Side Of Engine (5.3L/6.0L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 27: Upper Right Side Of Engine (5.3L/6.0L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 28: Upper Right Side Of Engine (5.3L/6.0L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 29: Lower Right Rear Of Engine (5.3L/6.0L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 30: Power Brake Booster

Courtesy of GENERAL MOTORS CORP.

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Fig. 31: Under Left Side Of Dash

Courtesy of GENERAL MOTORS CORP.

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Fig. 32: Fuel Tank

Courtesy of GENERAL MOTORS CORP.

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Fig. 33: Lower Left Side Of Engine (4.2L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 34: Top Of Engine (4.2L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 35: Right Side Of Transmission

Courtesy of GENERAL MOTORS CORP.

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Fig. 36: Left Front Of Chassis

Courtesy of GENERAL MOTORS CORP.

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Fig. 37: Center Of Dash

Courtesy of GENERAL MOTORS CORP.

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Fig. 38: Rear Of Engine Compartment

Courtesy of GENERAL MOTORS CORP.

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Fig. 39: Rear Of Front Fascia (1 Of 2)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 40: Rear Of Front Fascia (2 Of 2)

Courtesy of GENERAL MOTORS CORP.
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Fig. 41: Left Side Of Engine (5.3L/6.0L) (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

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Fig. 42: Left Side Of Engine (5.3L/6.0L) (2 Of 2)

Courtesy of GENERAL MOTORS CORP.

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Fig. 43: Right Side Of Engine (1 Of 2) (5.3L/6.0L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 44: Right Side Of Engine (2 Of 2) (5.3L/6.0L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 45: Chassis (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

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Fig. 46: Chassis (2 Of 2)

Courtesy of GENERAL MOTORS CORP.

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Fig. 47: Rear Of Dash (1 Of 2)

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Fig. 48: Rear Of Dash (2 Of 2)

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Fig. 49: Passenger Compartment (1 Of 2)

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Fig. 50: Passenger Compartment (2 Of 2)

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Fig. 51: Under Floor Console

Courtesy of GENERAL MOTORS CORP.

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Fig. 52: Electronic Components

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Fig. 53: Lower Left Side Of Engine (4.2L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 54: Lower Right Side Of Engine (5.3L/6.0L)

Courtesy of GENERAL MOTORS CORP.

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 55: Right Rear Of Engine Compartment

Courtesy of GENERAL MOTORS CORP.

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Fig. 56: Left Front Of Engine (4.2L)

Courtesy of GENERAL MOTORS CORP.

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Fig. 57: Left "B" Pillar

Courtesy of GENERAL MOTORS CORP.

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Fig. 58: Right Side Of Instrument Panel Carrier

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Fig. 59: Air Duct In Instrument Panel Carrier

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 60: Center Section Of Instrument Panel Carrier

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 61: Dash Panel

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Fig. 62: Battery (4.2L)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 63: Instrument Panel Carrier

Courtesy of GENERAL MOTORS CORP.

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 64: Brake Fluid Level Switch

Courtesy of GENERAL MOTORS CORP.

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 65: Right Front Side Of Engine

Courtesy of GENERAL MOTORS CORP.

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Fig. 66: Camshaft Position (CMP) Sensor

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 67: Overhead Console

Courtesy of GENERAL MOTORS CORP.

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Fig. 68: Lower Console

Courtesy of GENERAL MOTORS CORP.

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Fig. 69: Engine Cooling Fan

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Fig. 70: Lower Left Side Of Dash

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Fig. 71: Behind Right Side Of Instrument Panel

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Fig. 72: Driver Door

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Fig. 73: Front Passenger Door

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Fig. 74: Left Rear Door

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Fig. 75: Right Rear Door

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Fig. 76: Electronic Frontal Sensors

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Fig. 77: Engine Control Module (ECM)

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Fig. 78: Left Front Side Of Engine

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Fig. 79: Upper Right Side Of Engine

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Fig. 80: Upper Left Side Of Engine (4.2L)

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Fig. 81: Left Front Of Engine (5.3L/6.0L)

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Fig. 82: Behind Left Headlamp

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Fig. 83: Behind Right Headlamp

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Fig. 84: Below Rear Of Engine

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Fig. 85: Horn Assembly

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Fig. 86: Center Of Instrument Panel

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Fig. 87: Steering Wheel Column (1 Of 2)

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Fig. 88: Steering Wheel Column (2 Of 2)

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Fig. 89: Rear Floor

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Fig. 90: Beneath Passenger Seat Cushion

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Fig. 91: Right Rear Of Passenger Seat

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Fig. 92: Under Driver Seat

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Fig. 93: Under Passenger Seat

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Fig. 94: Left Inflatable Restraint Side Impact Sensor (SIS)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 95: Right Inflatable Restraint Side Impact Sensor (SIS)

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Fig. 96: Lower Left Side Of Engine

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Fig. 97: Behind Driver Seat

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Fig. 98: Behind Passenger Seat

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 99: Beneath Driver Seat Cushion

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Fig. 100: Park Neutral Position (PNP) Switch

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 101: Transfer Case

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 102: Rollover Sensor

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 103: Upper Right Side Of Engine

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 104: Sunroof Motor

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 105: Rear Chassis

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 106: Steering Column

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 107: Lower Left Side Of Instrument Carrier Support

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 108: Transmission Control Module (TCM)

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Fig. 109: Rear Of Engine

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 110: Under Front Passenger Seat

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 111: Right Rear Of Engine Harness (4.2L)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 112: Front Of Dash

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 113: Headliner Harness Routing

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 114: Underhood Fuse Block (4.2L)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 115: Left Seat Belt Pretensioner

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 116: Right Seat Belt Pretensioner

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Fig. 117: Front Door Harness Routing

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 118: Right Front Door Harness Routing

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 119: Grounds G101 & G106

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 120: Engine Grounds G107 & G108 (5.3L/6.0L)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 121: Engine Block Grounds G107, G108, G109 & G110 (4.2L)
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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 122: G109 (5.3L/6.0L)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 123: Left Side Of Engine (5.3L/6.0L)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 124: Ground G306

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 125: Ground G401

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 126: Ground G403

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 127: Underhood Fuse Block (5.3L/6.0L)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 128: Rear Fuse Block

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 129: Rear Of Vehicle

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 130: Instrument Panel Carrier

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Fig. 131: Battery (5.3L/6.0L)

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2007 GENERAL MOTORS Envoy, Rainier & TrailBlazer

Fig. 132: Electronic Brake Control Module

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