Hummer H2. Manual - part 2061

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 B0053 is a latched code. You cannot clear a latched code. Replace the SDM after following the 
instructions in the following diagnostic table. 

Diagnostic Aids 

When DTC B0053 is accompanied by additional DTC(s) (other than B0051), repair the malfunction causing the 
other DTC(s) before replacing the SDM. 

DTC B0053 

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

2

1. Turn OFF the ignition.  

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 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

-

1. Reconnect all SIR system components.  

2. Verify that all components, connectors, and 

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

DTC B0090 

Circuit Description 

The inflatable restraint I/P module disable switch circuit consists of an I/P module disable switch, I/P module 
disable switch indicator, I/P module disable switch signal circuit, and I/P module suppression indicator control 
circuit. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs 
tests to diagnose critical malfunctions within itself. The SDM monitors the voltage levels at the I/P module 
disable switch signal and the I/P module suppression indicator control circuits of the SDM to determine the 
position of the I/P module disable switch. If a malfunction is detected, a DTC will be stored. 

Conditions for Running the DTC 

Ignition 1 voltage is within the normal operating voltage range. 

Conditions for Setting the DTC 

The voltage at I/P module disable switch signal and I/P module suppression indicator control is low or high 
with the I/P module disable switch indicator OFF for 500 milliseconds. 

Action Taken When the DTC Sets 

z

The I/P module disable switch is defaulted to a calibration state.  

z

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

Conditions for Clearing the DTC 

z

The condition responsible for setting the DTC no longer exists.  

z

You issue a scan tool CLEAR DTCs command.  

z

A history DTC will clear once 255 malfunction free ignition cycles have occurred.  

Diagnostic Aids 

The following can cause an intermittent condition: 

A short between the I/P module disable switch signal and I/P module suppression indicator control circuits. 
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. 

Test Description 

The numbers below refer to the step numbers on the diagnostic table:

6

CPAs are properly mounted.  

Did you complete the repair?

-

Go to Diagnostic 

System Check - 

SIR

-

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

5: Tests for an open or high resistance in the I/P module disable switch power feed circuit.  

6: Tests for an open or high resistance in the I/P module disable switch ground circuit.  

8: Tests for an open or high resistance in the I/P module disable switch signal circuit.  

9: Tests for a short in the I/P module disable switch signal circuit.  

10: Tests for short in the I/P module suppression indicator control circuit.  

11: Tests for an open or high resistance in the I/P module suppression indicator control circuit.  

DTC B0090 

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

2

1. Turn OFF the ignition.  

2. Turn the I/P module disable switch to the ON position.  

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

Does the I/P module disable switch ON indicator illuminate in 
the I/P module disable switch?

-

Go to 

Step 7

Go to Step 3

3

1. Turn OFF the ignition.  

2. Disconnect the I/P module disable switch connector. 

Refer to Inflatable Restraint Instrument Panel (I/P) 
Module Disable Switch Replacement .  

3. Inspect the I/P module disable switch connector for 

corrosion or damage. 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 

13

Go to Step 4

4

1. Disconnect the SDM connector. Refer to Inflatable 

Restraint Sensing and Diagnostic Module 
Replacement .  

2. Inspect the SDM connector for corrosion or damage. 

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 

13

Go to Step 5

5

Test the I/P module disable switch power feed circuit for an 
open or high resistance. Refer to Circuit Testing and 

-

Go to 

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Step 

13

Go to Step 6

6

Test the I/P module disable switch ground circuit for an open or 
high resistance. Refer to Circuit Testing and Connector 
Repairs in Wiring Systems. 
Did you find and correct the condition?

-

Go to 

Step 

13

Go to Step 7

7

1. Install a scan tool.  

2. Turn the I/P module disable switch to the ON position.  

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

4. With a scan tool, observe the SIR data list.  

Does the I/P module disable switch (active switch) show the 
specified state?

Enabled

Go to 

Step 9

Go to Step 8

8

1. Turn OFF the ignition.  

2. Test the I/P module disable switch signal circuit for an 

open or high resistance. Refer to Circuit Testing and 
Connector Repairs in Wiring Systems.  

Did you find and correct the condition?

-

Go to 

Step 

13

Go to Step 9

9

Test the I/P module disable switch signal circuit for a short. 
Refer to Circuit Testing and Connector Repairs in Wiring 
Systems. 
Did you find and correct the condition?

-

Go to 

Step 

13

Go to Step 10

10

Test the I/P module suppression indicator control circuit for a 
short. Refer to Circuit Testing and Connector Repairs in 
Wiring Systems. 
Did you find and correct the condition?

-

Go to 

Step 

13

Go to Step 11

11

Test the I/P module suppression indicator control circuit for an 
open or high resistance. Refer to Circuit Testing and 
Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

-

Go to 

Step 

13

Go to Step 12

12

Replace the I/P module disable switch. Refer to Inflatable 
Restraint Instrument Panel (I/P) Module Disable Switch 
Replacement . 
Did you complete the repair?

-

Go to 

Step 

13

-

13

1. Reconnect all SIR system components.  

2. Verify that all components, connectors and CPAs are 

properly mounted.  

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.  

Does the DTC reset?

-

Go to 

Step 2

System OK

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2