Chevrolet Silverado / GMC Sierra. Service manual — part 682

damage.

The seat belts-Perform the seat belt operational and functional checks. Refer to
Operational and Functional Checks .

The I/P mounting points and brackets-Inspect for bending, twisting, buckling, or any other
type of damage.

The roof rail and roof rail module mounting points-Inspect for bending, twisting, buckling,
or any other type of damage.

The seats and seat mounting points-Inspect for bending, twisting, buckling, or any other type
of damage.

Passenger seat bottom equipped with Passenger Presence System (PPS)-Check for any
DTCs or problems that may cause the PPS not to function properly.

Accident With Frontal Air Bag Deployment - Component Replacement and Inspections

After a collision involving air bag deployment, replace the following components. If you detect
any damage, replace the component. If you detect any damage to the mounting points or mounting
hardware, repair or replace the mounting points and mounting hardware as needed.

Inflatable restraint front end sensors

Inflatable restraint I/P module, if deployed and after performing the necessary inspections
listed above

Inflatable restraint sensing and diagnostic module (SDM)

Inflatable restraint steering wheel module

Inflatable restraint steering wheel module coil

Seat belt pretensioners

Perform additional inspections on the following components:

Steering wheel module coil and the coil wiring pigtail-Inspect for melting, scorching, or
other damage due to excessive heat.

Mounting points or mounting hardware for the I/P module, steering wheel module, SDM,
front end sensors, seat belt pretensioners, and vehicle rollover sensor-Inspect for any damage

IMPORTANT: The front passenger seat is equipped with a PPS, which detects

an occupant. If the requirements for disabling the I/P air bag are
met then the PPS will communicate with the SDM to disable/turn
off the I/P air bag, even in a accident. For more information on the
PPS refer to SIR System Description and Operation.

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

and repair or replace each component as needed.

Passenger Presence System (PPS) for damage to the wiring or pressure system

Accident With Side Air Bag Deployment - Component Replacement and Inspections

After a collision involving side air bag deployment, replace the following components:

Inflatable restraint roof rail module, on the side of the impact.

Inflatable restraint side impact sensors (SIS) (front/rear), on the side of the impact

Inflatable restraint SDM

Seat belt pretensioner, on the side of impact.

Perform additional inspections on the following components:

Mounting points or mounting hardware for the SIS, roof rail module (left/right), and seat
belt pretensioner on the side of impact-Inspect for any damage and repair or replace each
component as needed.

Mounting points or mounting hardware for the SDM and vehicle rollover sensor-Inspect for
any damage and repair or replace each component as needed.

Sensor Replacement Guidelines

The SIR/side air bag sensor replacement policy requires replacing sensors in the area of accident
damage. The area of accident damage is defined as the portion of the vehicle which is crushed,
bent, or damaged due to a collision. An example of this would be a moderate collision where the
front of the vehicle impacts a tree, if the vehicle has an SIR sensor mounted forward of the
radiator, replace the SIR sensor.

Replace the sensor whether or not the air bags have deployed.

Replace the sensor even if the sensor appears to be undamaged.

Sensor damage which is not visible, such as slight bending of the mounting bracket or cuts in the
wire insulation, can cause improper operation of the SIR/side air bag sensing system. Do not try
to determine whether the sensor is undamaged. Replace the sensor. Also, if you follow a
diagnostic trouble code (DTC) table and a malfunctioning sensor is indicated, replace the sensor.

INFLATOR MODULE HANDLING AND SCRAPPING

Live and Undeployed Inflator Module

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 29: View Of Proper Handling Of Undeployed Inflator Module
Courtesy of GENERAL MOTORS CORP.

Take special care when handling or storing an undeployed inflator module. An inflator module
deployment produces a rapid generation of gas. This may cause the inflator module, or an object
in front of the inflator module, to project through the air in the event of an unlikely deployment.

CAUTION: Refer to SIR Inflator Module Handling and Storage Caution .

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Dual Stage Inflator Module

Dual stage inflator modules have 2 deployment stages. If stage 1 was used to deploy a dual stage
inflator module, stage 2 may still be active. Therefore, a deployed dual stage inflator module must
be treated as an active module. If disposal of a dual stage module is required, both deployment
loops must be energized to deploy the air bag.

Scrapping Procedure

During the course of a vehicles useful life, certain situations may arise which will require the
disposal of a live and undeployed inflator module. Do NOT dispose a live and undeployed
inflator module through normal disposal channels until the inflator module has been deployed.

Do not deploy the inflator module in the following situations:

After replacement of an inflator module under warranty - the inflator module may need to
be returned undeployed to the manufacturer.

If the vehicle is the subject of a Product Liability report, GM-1241, related to the SIR
system and is subject to a preliminary investigation - do NOT alter the SIR system in any
manner.

If the vehicle is involved in a campaign affecting the inflator modules - follow the
instructions in the Campaign Service Bulletin for proper SIR handling procedures.

Deployment Procedures

You can deploy the inflator module either inside or outside of the vehicle. The method used
depends upon the final disposition of the vehicle. Review the following procedures in order to
determine which will work best in a given situation:

Deployment Outside Vehicle - Steering Wheel Module, I/P Module, and Roof Rail Module

Deploy the inflator module outside of the vehicle when the vehicle will be returned to service.
Situations that require deployment outside of the vehicle include the following:

Using the SIR diagnostics, you determine that the inflator module is malfunctioning.

The inflator module is cosmetically damaged, scratched, or ripped.

The inflator module pigtail is damaged.

The inflator module connector is damaged.

The inflator module connector terminals are damaged.

Deployment and disposal of a malfunctioning inflator module is subject to any required retention

2008 Chevrolet Silverado 1500

2008 RESTRAINTS Supplemental Inflatable Restraints - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado