Hummer H2. Manual - part 2032

RUN position.  

Does the AIR BAG warning lamp flash seven 
times?

Go to Step 4

Go to Step 17

4

1. Install a scan tool.  

2. Establish communication with the 

instrument cluster.  

3. Use the scan tool to request the 

instrument cluster DTC display.  

Does the scan tool indicate that DTC U1088 
is current?

-

Go to DTC U1001-

U1254 in Data Link 

Communications

Go to Step 5

5

Use the scan tool to command the AIR BAG 
warning lamp ON. 
Does the AIR BAG warning lamp command 
ON?

-

Go to Step 6

Go to Step 17

6

1. Establish communication with the 

inflatable restraint sensing and 
diagnostic module (SDM).  

2. Use the scan tool to request the SIR 

DTC display.  

Does the ignition voltage displayed measure 
more than the specified value?

9 V

Go to Step 7

Go to Step 8

7

Does the ignition voltage displayed measure 
more than the specified value?

16 V

Go to Diagnostic 

System Check - 

Engine Electrical in 

Engine Electrical

Go to Step 16

8

1. Turn OFF the ignition.  

2. Disconnect the inflatable restraint 

sensing and diagnostic module (SDM) 
wiring harness connector. Refer to 
Inflatable Restraint Sensing and 
Diagnostic Module Replacement .  

3. Inspect the SDM wiring harness 

connector for signs of corrosion or 
damage.  

Does the connector exhibit any signs of 
corrosion or damage?

-

Go to Step 9

Go to Step 10

9

Repair or replace the inflatable restraint 
sensing and diagnostic module (SDM) wiring 
harness connector. Refer to Connector 
Repairs in Wiring Systems. 

-

-

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

Did you complete the replacement?

Go to Step 18

10

1. Disable the SIR system.  

2. UsingJ 39200 DMM measure the 

resistance between the inflatable 
restraint sensing and diagnostic module 
(SDM) wiring harness connector 
ignition 1 circuit and the output side of 
the SIR Fuse. Refer to Circuit Testing 
in Wiring Systems.  

Does the resistance measure within the 
specified value?

0-2 

ohm

Go to Step 12

Go to Step 11

11

Locate and repair an open or high resistance 
in the ignition 1 circuit between the SIR Fuse 
and the SDM wiring harness connector. Refer 
to Wiring Repairs in Wiring Systems. 
Did you complete the repair?

-

Go to Step 18

-

12

1. Turn ON the ignition, with the engine 

OFF.  

2. UsingJ 39200 DMM measure the 

voltage between the power feed to the 
SIR Fuse and a known good ground. 
Refer to Circuit Testing in Wiring 
Systems.  

Does the voltage measure near the specified 
value?

12 V

Go to Step 14

Go to Step 13

13

Locate and repair an open or high resistance 
in the power feed circuit to the SIR Fuse. 
Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?

-

Go to Step 18

-

14

Using J 39200 DMM measure the resistance 
of the inflatable restraint sensing and 
diagnostic module (SDM) ground circuit 
between the SDM wiring harness connector 
and a known good ground. Refer to Circuit 
Testing in Wiring Systems. 
Does the resistance measure less than the 
specified value?

2 ohm

Go to Step 16

Go to Step 15

15

Locate and repair an open or high resistance 
in the inflatable restraint sensing and 
diagnostic module (SDM) ground circuit. 
Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

-

Go to Step 18

-

Replace the inflatable restraint sensing and 

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

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