Hummer H2. Manual - part 2060

2

to Inflatable Restraint Steering Wheel Module Coil 
Replacement (Coil) .  

3. Inspect the component and harness sides of the in-line connector for 

the steering wheel module coil for damage or corrosion that may 
cause the malfunction. Refer to Testing for Intermittent 
Conditions and Poor Connections and Connector Repairs in 
Wiring Systems.  

Does connector exhibits any signs of damage or corrosion?

Go to 

Step 3

Go to Step 4

3

1. If the in-line connector for the steering wheel module coil is 

damaged, the steering wheel module coil must be replaced. Refer to 
Inflatable Restraint Steering Wheel Module Coil Replacement 
(Coil) .  

2. If the wiring harness side of steering wheel module coil in-line 

connector is damaged, replace the harness side of the connector. 
Refer to Connector Repairs in Wiring Systems.  

Did you complete the repair?

Go to 

Step 

11

-

4

1. Use the J 38715-100 adapter to connect the J 38715-A SIR 

Driver/Passenger Load Tool to the harness side of the steering 
wheel module coil in-line connector. See Special Tools and 
Equipment .  

2. Turn ON the ignition, with the engine OFF.  

3. Use the scan tool to request SIR DTCs displayed.  

Does the scan tool indicate that DTC B0022, B0024, or B0026 are 
current?

Go to 

Step 6

Go to Step 5

5

1. Turn OFF the ignition.  

2. Disconnect and remove both the J 38715-A . See Special Tools and 

Equipment .  

3. Connect the steering wheel module coil in-line connector.  

4. Remove the steering wheel module. Refer to Inflatable Restraint 

Steering Wheel Module Replacement .  

5. Use the J 38715-30A adapter to connect the J 38715-A to the upper 

steering wheel module coil connector on top of the steering column. 
See Special Tools and Equipment .  

6. Turn ON the ignition, with the engine OFF.  

7. Use the scan tool to request SIR DTCs displayed.  

Does the scan tool indicate that DTC B0022, B0024, or B0026 are 
current?

Go to 

Step 9

Go to Step 8

1. Turn OFF the ignition.  

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

6

2. Disconnect and remove both the J 38715-A and adapter. See 

Special Tools and Equipment .  

3. Disconnect the inflatable restraint sensing and diagnostic module 

(SDM) connector. Refer to Inflatable Restraint Sensing and 
Diagnostic Module Replacement .  

4. Inspect the SDM connector for damage or corrosion that may cause 

a malfunction in the steering wheel module high and/or low circuits. 
Refer to Testing for Intermittent Conditions and Poor 
Connections and Connector Repairs in Wiring Systems.  

Did you find and correct the condition?

Go to 

Step 

11

Go to Step 7

7

1. If DTC B0022 is present, test the steering wheel module for a short 

between the high and low circuits.  

2. If DTC B0024 is present, test the steering wheel module high and 

low circuits for a short to ground and for a short to voltage.  

3. If DTC B0026 is present, test the steering wheel module high and 

low circuits for an open and for high resistance.  

4. All the above conditions refer to Circuit Testing and Wiring 

Repairs in Wiring Systems.  

Did you find and correct the condition?

Go to 

Step 

11

Go to Step 10

8

1. Turn OFF the ignition.  

2. Replace the steering wheel module. Refer to Inflatable Restraint 

Steering Wheel Module Replacement .  

Did you complete the replacement?

Go to 

Step 

11

-

9

1. Turn OFF the ignition.  

2. Replace the steering wheel module coil. Refer to Inflatable 

Restraint Steering Wheel Module Coil Replacement (Coil) .  

Did you complete the replacement?

Go to 

Step 

11

-

10

1. Turn OFF the ignition.  

2. Replace the SDM. Refer to Inflatable Restraint Sensing and 

Diagnostic Module Replacement .  

Did you complete the replacement?

Go to 

Step 

11

-

11

1. Connect all SIR components.  

2. Turn ON the ignition, with the engine OFF.  

3. Use the scan tool in order to clear the DTCs.  

4. Operate the vehicle within the Conditions for Running the DTC as 

specified in the supporting text.  

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

DTC B0051 

Circuit Description 

The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device (accelerometer) that 
converts vehicle velocity to an electrical signal. The SDM compares this signal to a value stored in memory. 
When the generated signal exceeds the stored value, the SDM performs additional signal processing and 
compares the generated signals to values stored in memory. When two of the generated signals exceed the 
stored values, the SDM will cause current to flow through the inflator modules, deploying the air bags and 
causing DTC B0051 to set. 

This DTC is set when the inflatable restraint sensing and diagnostic module (SDM) has commanded an air bag 
deployment with no faults present. 

Conditions for Running the DTC 

The SDM must be powered up. 

Conditions for Setting the DTC 

Ignition voltage must be present and the inflatable restraint sensing and diagnostic module (SDM) must have 
commanded an air bag deployment. 

Action Taken When the DTC Sets 

z

The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.  

z

The SDM records crash data.  

Conditions for Clearing the DTC 

DTC B0051 is a latched code. You cannot clear a latched code. Replace the SDM after following the 
instructions in the following diagnostic table. 

DTC B0051 

Does the DTC reset?

Go to 

Step 2

System OK

Step

Action

Value

(s)

Yes

No

Schematic Reference:SIR Schematics 
Connector End View Reference:SIR Connector End Views

1

Did you perform the Diagnostic System Check - 
SIR?

-

Go to Step 2

Go to Diagnostic 

System Check - 

SIR

1. Turn OFF the ignition.  

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

DTC B0053 

Circuit Description 

The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device (accelerometer) that 
converts vehicle velocity to an electrical signal. The SDM compares this signal to a value stored in memory. 
When the generated signal exceeds the stored value, the SDM performs additional signal processing and 
compares the generated signals to values stored in memory. When two of the generated signals exceed the 
stored values, the SDM will cause current to flow through the inflator modules, deploying the air bags. DTC 
B0053 will set instead of DTC B0051 when a deployment occurs while an inflator circuit fault is present that 
may result in a non-deployment situation in one or more of the inflator modules. 

Conditions for Running the DTC 

The SDM must be powered up. 

Conditions for Setting the DTC 

Ignition voltage must be present and the inflatable restraint sensing and diagnostic module (SDM) must have 
commanded an air bag deployment with loop faults.

2

2. Inspect the vehicle for any signs of air bag 

deployment.  

Does the vehicle exhibit any signs of air bag 
deployment?

-

Go to Step 5

Go to Step 3

3

Inspect the vehicle and undercarriage for any signs 
of impact or collision. 
Does the vehicle exhibit any signs of impact or 
collision?

-

Go to Step 5

Go to Step 4

4

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

-

Go to Step 6

-

5

Replace all components and perform inspections as 
required following an accident. Refer to Repairs 
and Inspections Required After a Collision . 
Did you complete the appropriate inspections and 
necessary repairs?

-

Go to Step 6

-

6

1. Reconnect all SIR system components.  

2. Verify that all components, connectors, and 

CPAs are properly mounted.  

Did you complete the repair?

-

Go to Diagnostic 

System Check - 

SIR

-

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2