Hummer H2. Manual — part 21

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Center air bag sensor contains mercury. After replacement, DO NOT destroy old part. When scrapping
vehicle or replacing center air bag sensor, remove center air bag sensor and dispose of it as toxic waste.

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Never disassemble and repair front air bag sensors, center air bag sensor or steering wheel pad.

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Replace dropped, cracked, dented or otherwise damaged component.

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DO NOT expose front air bag sensors, center air bag sensor or steering wheel pad directly to heat or
flame.

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Information labels are attached to air bag components. Follow all notices on labels.

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After work on SRS is completed, check air bag warning light to ensure system is functioning properly.
See SYSTEM OPERATION CHECK .

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

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When placing a live air bag 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.

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After deployment, air bag surface may contain deposits of sodium hydroxide, which irritates skin. Always
wear safety glasses, rubber gloves and long-sleeved shirt during clean-up. After clean-up, wash hands
using mild soap and water.

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Carry a live air bag module with trim cover (air bag) pointed away from body to minimize injury in case
of accidental air bag deployment.

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If SRS is not fully functional for any reason, vehicle should not be driven until system is repaired and
again becomes operational. DO NOT remove bulbs, modules, sensors or other components or in any way
disable system from operating normally. If SRS is not functional, park vehicle until it is repaired and
functions properly.

DISABLING & ACTIVATING AIR BAG SYSTEM

Disabling Air Bag System

1. Obtain radio anti-theft protection code from owner prior to servicing vehicle or deactivate radio anti-theft

function before disconnecting vehicle battery.

2. Place front wheels in straight-ahead position. Turn ignition switch to LOCK position. Disconnect and

shield negative battery cable. Wait at least 90 SECONDS before working on vehicle.

3. Remove lower finish panel and steering column lower cover. Remove heater-to-register duct (Supra

only). Disconnect driver-side air bag module connector. Air bag connector terminals are automatically
shorted together.

4. Disconnect passenger-side air bag connector, accessible through finish plate on top or side of glove box

opening. Air bag connector is automatically shorted.

Activating Air Bag System

Connect passenger-side air bag connector. Connect driver-side air bag module connector. Install heater-to-

WARNING:

Some vehicles are equipped with a passenger-side air bag ON/OFF
switch. This switch should NOT be used in place of specified vehicle air
bag system disabling and activating procedures.

1997 Lexus SC 300

GENERAL INFORMATION Air Bag Deactivation Procedures

register duct (Supra only). Install steering column lower cover and finish panel. Connect negative battery cable.
Perform SYSTEM OPERATION CHECK .

VOLKSWAGEN

SYSTEM OPERATION CHECK

An air bag light is located on left side of instrument cluster. Air bag light is used to indicate readiness of system.
This light, which glows when ignition switch is on or engine is started, will stay on a few seconds while air bag
control unit performs an electronic test of system. If air bag light does not glow when ignition is on or does not
go out after a few seconds, a fault probably exists in system. If a fault occurs while ignition is on, it is stored in
fault memory. Warning light will then glow and air bag system will be switched off. If warning light glows or
flickers while driving, air bag system should be tested.

SERVICE PRECAUTIONS

Observe these precautions when working with air bag systems:

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Before disconnecting battery cable(s) and disabling air bag system, obtain radio security code from
vehicle owner.

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DO NOT use a computer memory saver tool. Using computer memory saver tool will keep air bag
system active and may cause accidental deployment of air bag.

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Disable air bag system before servicing any air bag system or steering column component. See
DISABLING AIR BAG SYSTEM .

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Because of critical operating requirements of system, DO NOT attempt to service any air bag system
component.

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Air bag parts should not be left unattended. They should be installed in vehicle immediately after
obtaining them.

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Air bag components which have been dropped more than 20 inches should not be used.

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DO NOT expose air bag system components to temperatures greater than 212°F (100°C).

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Chemical cleaners, oil and grease should not contact vinyl covering on air bag.

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DO NOT place stickers or covers on steering wheel.

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Always disable air bag system before performing electric welding on vehicle.

DISABLING & ACTIVATING AIR BAG SYSTEM

To disable air bag system, disconnect and shield negative battery cable. To activate system, turn ignition switch
to ON position. Ensure no one is inside vehicle and connect negative battery cable. Perform a system
operational check to ensure proper system operation. See SYSTEM OPERATION CHECK .

VOLVO

NOTE:

Information on C70 is not available from manufacturer.

1997 Lexus SC 300

GENERAL INFORMATION Air Bag Deactivation Procedures

SYSTEM OPERATION CHECK

Turn ignition switch to ON position (engine not running). If no fault codes are present, SRS warning light will
go out after 10 seconds. If SRS is malfunctioning, SRS fault code will be stored in crash sensor memory during
the following conditions:

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SRS warning light does not glow.

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SRS warning light does not go out after 10 seconds.

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SRS warning light does not go out after engine is started.

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SRS warning light comes on while driving.

If SRS warning light indicates a malfunction, diagnose air bag system.

Seat Belt Tensioner Inspection

1. There are 2 methods of determining seat belt tensioner activation. Start by pulling seat belt out and

releasing it. If belt normally extends easily to full length, tensioner has not been activated. If either belt
sticks, jerks when reeling and unreeling or fails to reel, both belts must be replaced.

2. If seat belt tensioner activation cannot be determined, turn ignition switch to OFF position. Disconnect

negative battery cable. Remove "B" post inner panel. Insert a steel rod into tensioner tube to establish
position of plunger.

3. On 850, S70 and V70, if plunger position is near bottom of tensioner tube, seat belt tensioner has been

activated and both belts must be replaced. If plunger position is near top of tensioner tube, seat belt
tensioner has not deployed.

4. On 960, S90 and V90, if plunger position is near bottom of tensioner tube, seat belt tensioner has not

deployed. If plunger position is near top of tensioner tube, seat belt tensioner has been activated and both
belts must be replaced.

SERVICE PRECAUTIONS

Observe these precautions when working with air bag systems:

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Always disable SRS before performing any air bag repairs. See DISABLING & ACTIVATING AIR
BAG SYSTEM .

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Always wear safety glasses and gloves when handling a deployed air bag module and/or seat belt
tensioners. Air bag module and/or seat belt tensioners may contain sodium hydroxide deposits, which
irritate skin.

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Use caution when handling sensors. Never strike or jar sensors. All sensors and mounting bracket bolts
must be tightened carefully to ensure proper sensor operation.

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Never apply power to SRS if any SRS crash sensor is not securely mounted to vehicle.

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Never make any measurement directly on air bag module(s) or seat belt tensioners.

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Wiring repairs should not be performed on any portion of SRS wiring harness.

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Always handle air bag modules with trim cover away from body. Always place air bag module on
workbench with trim cover facing up, away from loose objects.

1997 Lexus SC 300

GENERAL INFORMATION Air Bag Deactivation Procedures

DISABLING & ACTIVATING AIR BAG SYSTEM

Disabling System

1. Obtain radio security code from vehicle owner. Ensure radio is off before disconnecting battery. This will

prevent damage to radio microprocessor.

2. Before proceeding, see SERVICE PRECAUTIONS . Turn ignition switch to OFF position. Disconnect

and shield negative battery cable. Locate and disconnect air bag module and seat belt tensioner
connectors and passenger-side air bag module connector.

3. On models with side air bags, remove cover from side seat compartment. Remove transport safety device

from inside of cover. Install transport safety device onto side impact sensor. See Fig. 34 . Repeat
procedure for opposite front seat. SRS system is now disabled.

Activating System

After repairs are performed, ensure all wiring and component connectors are connected. Turn ignition switch to
ON position. Connect negative battery cable. Ensure vehicle is not occupied when connecting battery cable.
Ensure system is functioning properly. See SYSTEM OPERATION CHECK .

WARNING:

DO NOT disconnect crash sensor connector or standby power unit to
disable system. This action could cause air bag to deploy.

1997 Lexus SC 300

GENERAL INFORMATION Air Bag Deactivation Procedures