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