Hummer H2. Manual — part 2029

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

DTC B0091

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

Action Taken When the DTC Sets

z

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

z

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

z

The SDM toggles the I/P module disable switch AIR BAG indicator ON and OFF every 5 seconds.

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 the 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.

3: Observes the state of the I/P module disable switch, normal state being ON.

4: Tests for a malfunctioning I/P module disable switch.

5: Tests for a malfunctioning SDM.

2004 Hummer H2

2004 RESTRAINTS SIR - Hummer H2

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

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

DTC B0091

Step

Action

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. Disconnect the I/P module disable switch. 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

11

Go to Step 3

3

1. Reconnect the I/P module disable switch connector.

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

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

4. With a scan tool, observe the I/P module disable switch

(active switch) data parameter in the SDM inputs list.

Does the scan tool indicate that the I/P module disable switch
(active switch) is DISABLED?

Go to Step 4

Go to Step 5

4

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

2. With a scan tool, observe the I/P module disable switch

(active switch) data parameter.

Does the I/P module disable switch (active switch) data
parameter change state?

Go to

Diagnostic

Aids

Go to Step 5

5

1. Turn OFF the ignition.

2. Disconnect the I/P module disable switch. Refer to

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

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

4. With a scan tool, observe the I/P module disable switch

(active switch) data parameter.

2004 Hummer H2

2004 RESTRAINTS SIR - Hummer H2