Hummer H2. Manual - part 1055

I/P Compartment Lamp

Inside I/P compartment 
box, on the lower right side 
of the I/P

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Ignition Coil 1/Module

On the left rocker cover 
near the front of the engine

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Ignition Coil 2/Module

On the right rocker cover 
near the front of the engine

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Ignition Coil 3/Module

On the left rocker cover 
near the middle of the 
engine

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Ignition Coil 4/Module

On the right rocker cover 
near the middle of the 
engine

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Ignition Coil 5/Module

On the left rocker cover 
near the middle of the 
engine

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Ignition Coil 6/Module

On the right rocker cover 
near the front of the engine

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Ignition Coil 7/Module

On the left rocker cover 
near the rear of the engine

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Ignition Coil 8/Module

On the right rocker cover 
near the rear of the engine

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Ignition Key Alarm 

Switch

In the ignition key cylinder 
on the upper right side of 
steering column

Steering Wheel and 

Column Component 

Views in Steering 

Wheel and Column

-

Ignition Lock Cylinder 

Control Actuator

In the ignition key cylinder 
on the upper right side of 
steering column

Steering Wheel and 

Column Component 

Views in Steering 

Wheel and Column

Steering Wheel and 

Column Connector 

End Views in Steering 

Wheel and Column

Ignition Switch

Upper bottom center of 
steering column under 

Steering Wheel and 

Column Component 

Steering Wheel and 

Column Connector 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Wiring Systems (Component List) - Hummer H2

  

lower cover

Views in Steering 

Wheel and Column

End Views in Steering 

Wheel and Column

Inflatable Restraint Front 

End Discriminating 

Sensor - Left

On the left underside of the 
radiator core support

SIR Component 

Views in SIR

SIR Connector End 

Views in SIR

Inflatable Restraint Front 

End Discriminating 

Sensor - Right

On the right underside of 
the radiator core support

SIR Component 

Views in SIR

SIR Connector End 

Views in SIR

Inflatable Restraint I/P 

Module

On the right side of the I/P 
above the I/P compartment 
box

SIR Component 

Views in SIR

SIR Connector End 

Views in SIR

Inflatable Restraint I/P 

Module Disable Switch

In the I/P to the left of the 
compartment box

SIR Component 

Views in SIR

SIR Connector End 

Views in SIR

Inflatable Restraint 

Sensing/Diagnostic 

Module (SDM)

Under the driver seat

SIR Component 

Views in SIR

SIR Connector End 

Views in SIR

Inflatable Restraint 

Steering Wheel Module

In the center of the steering 
wheel

SIR Component 

Views in SIR

SIR Connector End 

Views in SIR

Inflatable Restraint 

Steering Wheel Module 

Coil

Under the steering wheel, 
part of the steering column 
assembly

SIR Component 

Views in SIR

SIR Connector End 

Views in SIR

Inside Rearview Mirror

Mounted to the windshield 
at the center of the window

Stationary Windows 

Component Views in 

Stationary Windows

Stationary Windows 

Connector End Views 

in Stationary Windows

Instrument Panel Cluster 

(I/PC)

On the left side of the I/P 
above the steering column

Instrument Panel, 

Gauges, and Console 

Component Views in 

Instrument Panel, 

Gauges and Console

Instrument Panel, 

Gauges, and Console 

Connector End Views 

in Instrument Panel, 

Gauges and Console

Intake Air Temperature 

(IAT)/Mass Air Flow 

(MAF) Sensor

Part of the air induction 
system between the air 
cleaner assembly and the 
throttle body

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Junction Block - Battery 

Cable Positive

On the lower left side of the 
engine

Engine Electrical 

Component Views in 

Engine Electrical

-

Junction Block - I/P

Behind the access panel, on 
the lower right side of the 
I/P

Electrical Center 

Identification Views

Electrical Center 

Identification Views

Junction Block - Rear

On the underside of the rear 
body near the center of the 
rear bumper

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Knock Sensor (KS) 1

In the valley under the 
intake manifold near the 

Engine Controls 

Component Views in 

Engine Controls 

Connector End Views 

in Engine Controls - 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Wiring Systems (Component List) - Hummer H2

  

front of the engine

Engine Controls - 6.0L

6.0L

Knock Sensor (KS) 2

In the valley under the 
intake manifold near the 
rear of the engine

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

License Lamp - Left

At the center of the liftgate

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

License Lamp - Right

At the center of the liftgate

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Liftgate Ajar Switch - 

Left

On the top left side of the 
liftgate

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Liftgate Ajar Switch - 

Right

On the top right side of the 
liftgate

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Liftgate Lock Actuator

In the center rear of liftgate 
behind trim panel

Power Door Systems 
Component Views in 

Doors

Power Door Systems 

Connector End Views 

in Doors

Liftgate Lock Relay

Near the right B-pillar 
courtesy lamp taped to the 
body harness

Harness Routing 

Views

Power Door Systems 

Connector End Views 

in Doors

Longitudinal 

Accelerometer

In the center console below 
the radio

ABS Component 

Views in Anti-lock 

Brake System

ABS Connector End 

Views in Anti-lock 

Brake System

Manifold Absolute 

Pressure (MAP) Sensor

At the top rear of the engine 
on the intake manifold

Engine Controls 

Component Views in 

Engine Controls - 6.0L

Engine Controls 

Connector End Views 

in Engine Controls - 

6.0L

Marker Lamp - LF

On the right front of the 
vehicle

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Marker Lamp - LR

On the left rear of the 
vehicle

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Marker Lamp - RF

On the right front of the 
vehicle

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Marker Lamp - RR

On the right rear of the 
vehicle

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Marker Lamps - Roof

On the front center of the 
roof

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Wiring Systems (Component List) - Hummer H2

  

Memory/Heated Seat 

Switch - Driver

On the driver door panel

Power Seat Systems 

Component Views in 

Seats

Power Seat Systems 

Connector End Views 

in Seats

Mode Actuator

On the left side of the 
HVAC module assembly

HVAC Component 

Views in HVAC - 

Automatic

HVAC Connector End 

Views in HVAC - 

Automatic

Noise Cancellation 

Microphone

Mounted inside the 
overhead console

Entertainment 

Component Views in 

Entertainment

Entertainment 

Connector End Views 

in Entertainment

Off-Road Lamps - Grille 

Guard - Upfitter 

Provision

Attached to the grille guard 
at the front of the vehicle

-

Lighting Systems 

Connector End Views 

in Lighting Systems

Off-Road Lamps - Relay 

1 - Upfitter Provision

Near the lower right side of 
the steering column, 
attached to the front brace 
of the I/P

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Off-Road Lamps - Relay 

2 - Upfitter Provision

Near the lower right side of 
the steering column, 
attached to the front brace 
of the I/P

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Off-Road Lamps - Roof 

Inner - Upfitter Provision

Attached to the inner roof 
rack on top of the outer roof

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

Off-Road Lamps - Roof 

Outer - Upfitter Provision

Attached to the outer roof 
rack on top of the outer roof

Lighting Systems 

Component Views in 

Lighting Systems

Lighting Systems 

Connector End Views 

in Lighting Systems

OnStar(R) Button 

Assembly (w/UE1)

Part of the vehicle 
communication interface 
module (VCIM) in the 
center of the dash, below 
the HVAC Control Module

Cellular 

Communication 

Component Views in 

Cellular 

Communication

Cellular 

Communication 

Connector End Views 

in Cellular 

Communication

Outside Rearview Power 

Folding Mirror Switch

Part of the mirror switch on 
the driver door master 
switch plate

Power Door Systems 
Component Views in 

Doors

Power Door Systems 

Connector End Views 

in Doors

Outside Rearview Mirror 

- Driver

Attached to the outside left 
front driver door

Power Door Systems 
Component Views in 

Doors

Power Door Systems 

Connector End Views 

in Doors

Outside Rearview Mirror 

- Passenger

Attached to the outside 
right front passenger door

Power Door Systems 
Component Views in 

Doors

Power Door Systems 

Connector End Views 

in Doors

Outside Rearview Mirror 

Switch

On the left door trim panel 
armrest master window 
switch plate

Power Door Systems 
Component Views in 

Doors

Power Door Systems 

Connector End Views 

in Doors

Park Brake Switch

Mounted near the top of the 
park brake pedal assembly

Hydraulic Brakes 

Component Views in 

Hydraulic Brakes 

Connector End Views 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Wiring Systems (Component List) - Hummer H2