TrailBlazer 4WD L6-4.2L VIN S (2002)
Air Bag(s) Arming and Disarming: Service Precautions
SIR Service Precautions
CAUTION:
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Refer to SIR Special Tool Caution in Service Precautions.
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If the vehicle interior is exposed to moisture and becomes soaked up to the level of the sensing and diagnostic module (SDM), the SDM
and SDM harness connector must be replaced. The SDM could be activated when powered, which could cause SIR deployment and result
in personal injury. The moisture must be removed and any damage caused by the moisture must be repaired prior to SIR component
replacements. Before attempting these procedures, the SIR system must be disabled. Refer to Air Bag(s) Arming and Disarming. Before
applying power to the SDM, make sure that it is securely fastened with the arrow facing toward the front of the vehicle. Failure to
observe these guidelines could result in Restraint Systems deployment, personal injury, or unnecessary SIR system repairs.
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When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to Air Bag(s)
Arming and Disarming. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR
system repairs.
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Proper operation of the Supplemental Inflatable Restraint (SIR) sensing system requires that any repairs to the vehicle structure return
the vehicle structure to the original production configuration. Not properly repairing the vehicle structure could cause non-deployment of
the air bag(s) in a frontal collision or deployment of the air bag(s) for conditions less severe than intended.
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Proper operation of the Supplemental inflatable Restraint (SIR) sensing system requires that any repairs to the vehicle structure return
the vehicle structure to the original production configuration. Not properly repairing the vehicle structure could cause non-deployment of
the side Impact air bag(s) in a side impact collision or deployment of the side impact air bag(s) for conditions less severe than intended.
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:
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Do not expose inflator modules to temperatures above 65°C (150°F).
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Verify the correct replacement part number. Do not substitute a component from a different vehicle.
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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:
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Inflatable restraint electronic frontal sensor (EFS)
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Inflatable restraint front end discriminating sensor
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Inflatable restraint IP module
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Inflatable restraint IP module disable switch
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Inflatable restraint sensing and diagnostic module (SDM)
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Inflatable restraint side impact modules
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Inflatable restraint side impact sensors (SIS)
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Inflatable restraint steering wheel module
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Inflatable restraint steering wheel module coil
