Hummer H2. Manual - part 2053

Fig. 82: View Of Insulated Connector Wire To Deployment Wire 
Courtesy of GENERAL MOTORS CORP. 

29. Twist together, bend, and tape the remaining connector wire lead to the remaining deployment wire.  

30. Inspect that the connection is secure. 

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

Fig. 83: Connector Position Assurance (CPA) & I/P Module Yellow 4-Way Connector - Zone 5 
Courtesy of GENERAL MOTORS CORP. 

31. Connect the deployment harness to the I/P module connector (1).  

32. Route the deployment harness out of the vehicle's passenger side.  

33. Stretch out all of the deployment harness wires on the left and right side of the vehicle to their full length. 

34. Completely cover the windshield and front door window openings with a drop cloth.  

35. Place a power source, 12 V minimum/2 A minimum, i.e., a vehicle battery, near the shorted ends of the 

 

2004 Hummer H2 

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deployment harnesses. 

36. Separate one set of wires and touch the wire ends to the power source in order to deploy the inflator 

modules.  

37. Disconnect the deployment harness from the power source and twist the wire ends together.  

38. Continue the same process with the remaining deployment harnesses that are available.  

39. Remove the drop cloth from the vehicle.  

40. Disconnect all harnesses from the vehicle.  

41. Discard the harnesses.  

42. Scrap the vehicle in the same manner as a non-SIR equipped vehicle.  

43. If one or more of the inflator modules did not deploy, perform the following steps to remove the 

undeployed modules from the vehicle: 

z

If the steering wheel module did not deploy, refer to Inflatable Restraint Steering Wheel Module 
Replacement .  

z

If the IP module did not deploy, refer to Inflatable Restraint Instrument Panel Module 
Replacement .  

44. Call the Technical Assistance Group for further assistance.  

DESCRIPTION AND OPERATION 

SIR SYSTEM DESCRIPTION AND OPERATION 

SIR System Overview 

The supplemental inflatable restraint (SIR) system supplements the protection offered by the occupant's seat 
belt system (2). The SIR system may contain several inflator modules located throughout the vehicle, i.e. 
steering wheel module (1) and instrument panel (I/P) module (1).Each inflator module has a deployment loop 
that is controlled by the sensing and diagnostic module (SDM) mounted inside the vehicle. The SDM 
determines the severity of a collision with the assistance of various sensor inputs. When the SDM detects a 
collision of sufficient force it will process the information provided by the sensors to further support air bag 
deployment. The SDM performs continuous diagnostic monitoring of the SIR system electrical components. 
Upon detection of a circuit malfunction, the SDM will set a DTC and inform the driver by turning the AIR 
BAG indicator ON. The steering column (1) and knee bolsters (3) are designed to absorb energy and compress 
during frontal collisions in order to limit leg movement and decrease the chance of injury to the driver and 
passenger. 

IMPORTANT: The inflator module will deploy when the wire ends contact the power 

source.

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

Fig. 84: Deployed Inflatable Restraint 
Courtesy of GENERAL MOTORS CORP. 

Frontal SIR System Description 

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2