Hummer H2. Manual - part 2171

Fig. 111: Inflatable Restraint Steering Wheel Module Coil (Without Centering Window On Front 
Side) 
Courtesy of GENERAL MOTORS CORP. 

4. If no centering window is present on the front side (3) of the inflatable restraint steering wheel module 

coil, but a spring service lock (1) is on the back side (2), perform the following steps: 

1. Hold the inflatable restraint steering wheel module coil with the back side up.  

2. While depressing the spring service lock, rotate the coil hub in the direction of the arrow (4) until 

the coil ribbon stops.  

3. Still pressing the spring service lock, rotate the coil hub in the opposite direction 2 1/2 revolutions. 

4. Release the spring service lock between locking tabs. The inflatable restraint steering wheel module 

coil is now centered.  

5. Align the centered inflatable restraint steering wheel module coil with the horn tower and slide onto 

the steering shaft assembly.  

 

2004 Hummer H2 

2004 STEERING Steering Wheel and Column - Hummer H2

  

Fig. 112: SIR Coil (Without Centering Window & Without Spring Service Lock) 
Courtesy of GENERAL MOTORS CORP. 

5. For no centering window on the front side (2) of the inflatable restraint steering wheel module coil and no 

spring service lock on the back side (1), perform the following steps: 

1. Hold the inflatable restraint steering wheel module coil with the face up.  

2. Rotate the coil hub in the direction of the arrow until the coil ribbon stops.  

3. Rotate the coil hub, slowly, counterclockwise, for 2 1/2 revolutions. This is the CENTER position.  

4. While maintaining the coil hub in the CENTER position, align the centered inflatable restraint 

steering wheel module coil with the horn tower and slide onto the steering shaft assembly.  

DESCRIPTION AND OPERATION 

STEERING WHEEL AND COLUMN DESCRIPTION AND OPERATION 

The steering wheel and column has 4 primary functions: 

z

Vehicle steering  

z

Vehicle security  

z

Driver convenience  

 

2004 Hummer H2 

2004 STEERING Steering Wheel and Column - Hummer H2

  

z

Driver safety  

Vehicle Steering 

The steering wheel is the first link between the driver and the vehicle. The steering wheel is fastened to a 
steering shaft within the column. At the lower end of the column, the intermediate shaft connects the column to 
the steering gear. 

Vehicle Security (Some Vehicle Models) 

Theft deterrent components are mounted and designed into the steering column. The following components 
allow the column to be locked in order to minimize theft: 

z

The ignition switch  

z

The steering column lock  

z

The ignition cylinder  

Driver Convenience 

The steering wheel and column may also have driver controls attached for convenience and comfort. The 
following controls may be mounted on or near the steering wheel or column. 

z

The turn signal switch  

z

The hazard switch  

z

The headlamp dimmer switch  

z

The wiper/washer switch  

z

The horn pad/cruise control switch  

z

The redundant radio/entertainment system controls  

z

The tilt or tilt/telescoping functions  

z

The navigation/OnStar(R) features  

z

The HVAC controls  

Driver Safety 

The energy-absorbing steering column compresses in the event of a front-end collision, which reduces the 
chance of injury to the driver. The mounting capsules break away from the mounting bracket in the event of an 
accident. 

Ignition Lock Cylinder Control Actuator 

If the vehicle is equipped with a floor mounted console gear shifter, it has a ignition lock cylinder control 
actuator system in the steering column as an added safety feature. The ignition lock cylinder control actuator's 
purpose is to prevent the steering wheel from being locked when the transmission is in gear and the vehicle may 
still be moving. The column ignition lock system consists of a ignition lock cylinder control actuator, and a park 

 

2004 Hummer H2 

2004 STEERING Steering Wheel and Column - Hummer H2

  

position switch that is located in the A/T shift lock control switch. The ignition lock cylinder control actuator 
contains a pin that is spring loaded out to mechanically prevent the ignition key cylinder from being turned to 
the lock position when vehicle transmission is not in the Park position. If vehicle power is lost, and/or the 
transmission is not in the Park position the operator will not be able to turn the ignition key to the lock position 
and will not be able to remove the ignition key from the column. 

SPECIAL TOOLS AND EQUIPMENT 

SPECIAL TOOLS 

Special Tools 

Illustration

Tool Number/Description

J 1859-A 

Steering Wheel Puller

J 21854-01 

Pivot Pin Remover

J 23653-SIR 

Steering Column Lock Plate Compressor

 

2004 Hummer H2 

2004 STEERING Steering Wheel and Column - Hummer H2