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