Hummer H3. Manual — part 590

Inflatable restraint sensing and diagnostic module (SDM)

Any Inflatable restraint air bag module

Inflatable restraint steering wheel module coil

Any Inflatable restraint sensor

Inflatable restraint seat belt pretensioners

Inflatable restraint Passenger Presence System (PPS) module or sensor

Disabling Procedure - Air Bag Fuse

1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead.

2. Place the ignition in the OFF position.

3. Locate and remove the fuse(s) supplying power to the SDM. Refer to SIR Schematics or

Electrical Center Identification Views .

4. Wait 1 minute before working on the system.

Enabling Procedure - Air Bag Fuse

1. Place the ignition in the OFF position.

2. Install the fuse(s) supplying power to the SDM. Refer to SIR Schematics or Electrical

Center Identification Views .

3. Turn the ignition switch to the ON position. The AIR BAG indicator will flash then turn

OFF.

4. Perform the Diagnostic System Check - Vehicle if the AIR BAG warning indicator does not

operate as described. Refer to Diagnostic System Check - Vehicle .

Disabling Procedure - Negative Battery Cable

1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead.

2. Place the ignition in the OFF position.

IMPORTANT: The SDM may have more than one fused power input. To

ensure there is no unwanted SIR deployment, personal injury
or unnecessary SIR system repairs, remove all fuses
supplying power to the SDM. With all SDM fuses removed
and the ignition switch in the ON position, the AIR BAG
warning indicator illuminates. This is normal operation and
does not indicate a SIR system malfunction.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

3. Disconnect the negative battery cable from the battery. Refer to Battery Negative Cable

Disconnection and Connection .

4. Wait 1 minute before working on system.

Enabling Procedure - Negative Battery Cable

1. Place the ignition in the OFF position.

2. Connect the negative battery cable to the battery. Refer to Battery Negative Cable

Disconnection and Connection .

3. Turn the ignition switch to the ON position. The AIR BAG indicator will flash then turn

OFF.

4. Perform the Diagnostic System Check - Vehicle if the AIR BAG warning indicator does not

operate as described. Refer to Diagnostic System Check - Vehicle .

REPAIR INSTRUCTIONS

SIR SERVICE PRECAUTIONS

The inflatable restraint sensing and diagnostic module (SDM) maintains a reserved energy supply.
The reserved energy supply provides deployment power for the air bags. Deployment power is
available for as much as 1 minute after disconnecting the vehicle power. Disabling the SIR system
prevents deployment of the air bags from the reserved energy supply.

General Service Instructions

The following are general service instructions which must be followed in order to properly repair
the vehicle and return it to its original integrity:

Do not handle the inflatable restraint vehicle rollover sensor when connected to vehicle
power.

Do not expose inflator modules to temperatures above 65°C (150°F).

Verify the correct replacement part number. Do not substitute a component from a different
vehicle.

CAUTION: When performing service on or near the SIR components or

the SIR wiring, the SIR system must be disabled. Refer to SIR
Disabling and Enabling. Failure to observe the correct
procedure could cause deployment of the SIR components,
personal injury or unnecessary SIR system repairs.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

Use only original GM replacement parts available from your authorized GM dealer. Do not
use salvaged parts for repairs to the SIR system.

Discard any of the following components if it has been dropped from a height of 91 cm (3 ft) or
greater:

Inflatable restraint front end sensor

Inflatable restraint instrument panel (I/P) module

Inflatable restraint passenger presence system (PPS)

Inflatable restraint roof rail module

Inflatable restraint SDM

Inflatable restraint side impact sensor (SIS)

Inflatable restraint steering wheel module

Inflatable restraint steering wheel module coil

Inflatable restraint vehicle rollover sensor

Seat belt pretensioner

INFLATABLE RESTRAINT FRONT END SENSOR REPLACEMENT

Removal Procedure

1. Disable the SIR system. Refer to SIR Disabling and Enabling.

2. Remove the engine shield. Refer to Engine Shield Replacement .

3. Loosen the fasteners (1) retaining the front discriminating sensors to the radiator support.

CAUTION: Do not strike or jolt the inflatable restraint front end

sensor. Before applying power to the front end sensor
make sure that it is securely fastened. Failure to observe
the correct installation procedure could cause SIR
deployment, personal injury or unnecessary SIR system
repairs.

CAUTION: Refer to SIR Caution .

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

Fig. 30: View Of Discriminating Sensor
Courtesy of GENERAL MOTORS CORP.

4. Remove the sensor assembly from the radiator support.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3