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