Hummer H2. Manual — part 2021

The following AIR BAG warning light conditions indicate possible SIR system faults:

z

Light does not illuminate at all.

z

Light remains illuminated when ignition is turned on.

z

Light illuminates while vehicle is driven.

SIR system faults are usually due to a disconnected/loose electrical connector caused by previous service on
vehicle. Always check all Yellow SIR connectors for loose connections or damage.

If all connectors are okay, and AIR BAG warning light is still not operating properly, diagnose SIR system.
Repair air bag system as necessary.

H2 WITH PASSENGER PRESENCE SYSTEM

PASSENGER AIR BAG ON/OFF indicators located on the rear view mirror are used to notify the driver when
the Passenger Presence System (PPS) has enabled or disabled the instrument panel inflator module. The PPS air
bag indicators will also inform the driver of any PPS malfunctions. When the ignition is turned on, the PPS
module is supplied with ignition 1 voltage and commands both PASSENGER AIR BAG ON/OFF indicators
ON for 5 seconds. The PPS module conducts tests on the PPS components and circuits while both ON/OFF
indicators are ON. If no malfunctions are detected, the PPS module will turn the PASSENGER AIR BAG
indicator ON or OFF depending on the status of the PPS. If a malfunction is detected, the PPS module will store
a Diagnostic Trouble Code (DTC), default the PPS to the OFF state and communicate with the SDM that a
DTC has been set. When the SDM detects that the PPS has set a DTC, the SDM will set either DTC B0092 or
B0098 and request the Instrument Panel Cluster (IPC) to turn the AIR BAG indicator located on the IPC ON.
This is done to notify the driver of any PPS malfunctions. The presence of a SIR system malfunction could
result in non-deployment of the air bags. The AIR BAG indicator will remain ON until the malfunction has
been repaired.

SERVICE PRECAUTIONS

Observe the following service precautions when working with air bag systems:

z

Disable appropriate air bag system zone or zones before servicing any air bag system or steering column
component. Failure to do this may result in accidental air bag deployment and possible personal injury.

NOTE:

When the following conditions apply:

z

Air Bag lamp is on.

z

Passenger Air Bag indicator always reads off.

z

DTC B0092 is reported.

The cause of this condition may be a shorted Passenger Presence System
(PPS) sensor wire. The PPS sensor harness is located under the front
passenger seat. This harness may be pinched between the seat frame and the
track/riser.

2004 Hummer H2

GENERAL INFORMATION Air Bag Deactivation Procedures - Hummer

See DISABLING & ACTIVATING AIR BAG SYSTEM .

z

Sensing and Diagnostic Module (SDM) maintains a reserve energy supply. Deployment power is
available for as long as one minute after disconnecting battery power. Servicing vehicle before this time
limit is reached may cause accidental air bag deployment and possible personal injury.

z

After repairs, stay well away from air bag inflator module(s), and turn ignition switch to ON position.
Ensure AIR BAG warning light is working properly and no system faults are indicated. See SYSTEM
OPERATION CHECK .

z

Use only new, original equipment replacement parts. DO NOT use salvaged parts for SIR system repairs.

z

DO NOT expose air bag inflator modules to temperatures above 150°F (65°C).

z

Always wear safety glasses when servicing or handling an air bag.

z

Air bag module must be stored in its original special container until it is ready to be used for service. It
must be stored in a clean, dry place, away from sources of extreme heat, sparks or high electrical energy.

z

When placing a live air bag module on a bench or other surface, always face air bag and trim cover
upward, away from surface. This will reduce motion of module if it is accidentally deployed.

z

After deployment, air bag surface may contain deposits of sodium hydroxide which can irritate skin.
Always wear safety glasses, rubber gloves and a long-sleeved shirt during clean-up. Wash hands using
mild soap and water. Follow correct disposal procedures.

z

When carrying a live air bag module, point trim cover away from your body to minimize injury in case of
accidental deployment. DO NOT carry live air bag module by wiring harness or connector.

z

DO NOT carry seat belt pretensioner by wiring harness or connector. Seat belt pretensioner can be carried
by piston tube. When handling a live seat belt pretensioner, DO NOT touch seat belt pretensioner in cable
area between buckle and mounting bolt hole. DO NOT cover pretensioner piston tube opening with hands
or point open end at yourself or others.

z

Coil assembly must be replaced whenever air bag is deployed. Replace SDM, driver air bag module,
passenger air bag module, side air bag module, side air bag sensor or front air bag sensor if any
component has been dropped from a height of 3 feet or more.

z

DO NOT attempt to repair SDM, air bag inflator modules, air bag sensors or steering wheel coil
assembly. Service all components by replacement only.

z

Electrical sources should never be allowed near inflator on back of air bag module.

z

Avoid touching SDM terminals to prevent electrostatic discharge damage.

z

If water enters the vehicle's interior and soaks the carpet up to level of SDM, inspect the affected area and
remove all evidence of water. Repair water damage, replace SDM, and replace harness connector. Failure
to do this may result in accidental air bag deployment and possible personal injury.

z

If air bag system is not fully functional for any reason, vehicle should not be driven until system is
repaired. DO NOT remove bulbs, modules, sensors or other components, or in any way disable system
from operating normally. If air bag system is not functional, park vehicle until repairs can be made.

DISABLING & ACTIVATING AIR BAG SYSTEM

WARNING:

Sensing and Diagnostic Module (SDM) maintains a reserve energy supply.
Deployment power is available for as long as one minute after
disconnecting battery power. Servicing vehicle before this time limit is

2004 Hummer H2

GENERAL INFORMATION Air Bag Deactivation Procedures - Hummer

SUPPLEMENTAL INFLATABLE RESTRAINT DISABLING & ENABLING ZONES

The Supplemental Inflatable Restraint (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. See Fig. 1 . Identify the specific zone or zones in which service
will be performed and disable and enable selected zone or zones.

Fig. 1: Locating Supplemental Inflatable Restraint (SIR) Disabling & Enabling Zones (Typical)
Courtesy of GENERAL MOTORS CORP.

H2

Disabling System

1. Before proceeding, follow air bag service precautions. See SERVICE PRECAUTIONS . Ensure front

reached may cause accidental air bag deployment and possible personal
injury.

NOTE:

When AIR BAG or SIR fuse is removed, and ignition is in ON position, AIR BAG
warning light will illuminate. This is normal operation and does not indicate SIR
system malfunction.

NOTE:

Not all zones are used by all vehicles.

NOTE:

With the SIR fuse removed and the ignition ON, the AIR BAG indicator
illuminates. This is normal operation and does not indicate an SIR system
malfunction.

2004 Hummer H2

GENERAL INFORMATION Air Bag Deactivation Procedures - Hummer

wheels are in straight-ahead position. Remove key. Remove AIR BAG fuse from the underhood fuse
block.

Zone 1 - Remove the Connector Position Assurance (CPA) clip from both Electronic Frontal
Sensor (EFS) connectors located on the frame crossmember. Disconnect the EFS connectors.

Zone 3 - Remove the CPA from the steering wheel module Yellow 2-pin connector located left of
the steering column near the knee bolster. Disconnect the steering wheel module yellow 2-pin
connector. See Fig. 2 .

Zone 5 - Remove the CPA clip from the (1) I/P module yellow 2-way connector (2) located behind
the I/P module. Disconnect the (1) I/P module yellow 2-way connector (2) located behind the I/P
module. See Fig. 3 .

Zone 7 - To disable inflatable restraint Sensing and Diagnostic Module (SDM) located in SIR Zone
7, disable Zones 3 and 5. Remove CPA clip from components Yellow connector. Disconnect
components Yellow connector from vehicle harness Yellow connectors.

2004 Hummer H2

GENERAL INFORMATION Air Bag Deactivation Procedures - Hummer