Hummer H2. Manual - part 2065

SIR DISABLING AND ENABLING ZONES 

The SIR system has been divided into Disabling and Enabling Zones. When performing service on or near SIR 
components or SIR wiring, it may be necessary to disable the SIR components in that zone. It may be necessary 
to disable more than one zone depending on the location of other SIR components and the area being serviced, 
refer to SIR Zone Identification Views . Refer to the illustration below, to identify the specific zone or zones 
in which service will be performed. After identifying the zone or zones, proceed to the disabling and enabling 
procedures for that particular zone or zones.

16

diagnostic module (SDM). Refer to 
Inflatable Restraint Sensing and 
Diagnostic Module Replacement . 
Did you complete the replacement?

-

Go to Step 18

-

17

Replace the instrument cluster. Refer to 
Instrument Panel Cluster (IPC) 
Replacement in Instrument Panel, Gauges 
and Console. 
Did you complete the replacement?

-

Go to Step 18

-

18

1. Reconnect all SIR and Instrument 

Cluster system components.  

2. Verify that all components, connectors, 

and CPAs are properly mounted.  

Have all SIR and Instrument Cluster 
components been properly connected and 
mounted?

-

Go to Diagnostic 

System Check - SIR

-

IMPORTANT: Refer to SIR Service Precautions before disabling the SIR system.

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

Fig. 5: SIR Disabling and Enabling Zones 
Courtesy of GENERAL MOTORS CORP. 

SIR Disabling and Enabling Zones 

REPAIR INSTRUCTIONS 

SIR SERVICE PRECAUTIONS 

Zone

Description

1

Inflatable Restraint Electronic Frontal Sensors (EFS). Refer to SIR Disabling and Enabling Zone 
1 .

2

Not Used

3

Inflatable Restraint Steering Wheel Module and Coil. Refer to SIR Disabling and Enabling Zone 
3 .

4

Not Used

5

Inflatable Restraint Instrument Panel (I/P) Module. Refer to SIR Disabling and Enabling Zone 
5 .

6

Not Used

7

Inflatable Restraint Sensing and Diagnostic Module (SDM). Refer to SIR Disabling and 
Enabling Zone 7 .

8-12 Not Used

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

The inflatable restraint sensing and diagnostic module (SDM) maintains a reserved energy supply. The reserved 
energy supply provides deployment power for the air bags. Deployment power is available for as much as 1 
minute after disconnecting the vehicle power. Disabling the SIR system prevents deployment of the air bags 
from the reserved energy supply. 

General Service Instructions 

The following are general service instructions which must be followed in order to properly repair the vehicle 
and return it to its original integrity: 

z

Do not expose inflator modules to temperatures above 65°C (150°F).  

z

Verify the correct replacement part number. Do not substitute a component from a different vehicle.  

z

Use only original GM replacement parts available from your authorized GM dealer. Do not use salvaged 
parts for repairs to the SIR system.  

Discard any of the following components if it has been dropped from a height of 91 cm (3 ft) or greater: 

z

Inflatable restraint electronic frontal sensor (EFS)  

z

Inflatable restraint I/P module  

z

Inflatable restraint sensing and diagnostic module (SDM)  

z

Inflatable restraint steering wheel module  

z

Inflatable restraint steering wheel module coil  

SIR DISABLING AND ENABLING ZONE 1 

Disabling Procedure 

1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.  

2. Turn OFF the ignition.  

3. Remove the key from the ignition.  

4. Remove the engine protection shield, if equipped. 

CAUTION: When performing service on or near the SIR components or the SIR 

wiring, the SIR system must be disabled. Refer to SIR Disabling and 
Enabling Zones. Failure to observe the correct procedure could cause 
deployment of the SIR components, personal injury, or unnecessary SIR 
system repairs.

IMPORTANT: Refer to SIR Service Precautions before disabling the SIR system.

IMPORTANT: With the SIR fuse removed and the ignition ON, the AIR BAG indicator 

illuminates. This is normal operation and does not indicate an SIR system 
malfunction.

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

Fig. 6: SIR Fuse & Underhood Fuse Block 
Courtesy of GENERAL MOTORS CORP. 

5. Remove the SIR fuse (1) from the underhood fuse block.  

6. Raise and support the vehicle. 

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2