Supplemental Inflatable Restraint System: Other Chevrolet Uplander I

Inflatable Restraint Side Impact Module - Right (AJ7)

SIR Connector End Views

Inflatable Restraint Side Impact Module - Right (AJ7)

Scheme 28

SIR Connector End Views

Inflatable Restraint Side Impact Sensing Module (SISM) - Left (AJ7)

Inflatable Restraint Side Impact Sensing Module (SISM) - Right (AJ7)

SIR Connector End Views

Inflatable Restraint Side Impact Sensing Module (SISM) - Right (AJ7)

Inflatable Restraint Steering Wheel Module C1

SIR Connector End Views

Inflatable Restraint Steering Wheel Module C1

Inflatable Restraint Steering Wheel Module C2

SIR Connector End Views

Inflatable Restraint Steering Wheel Module C2

Scheme 29

SIR Connector End Views

Seat Belt Pretensioner - LF

Seat Belt Pretensioner - RF

SIR Connector End Views

Seat Belt Pretensioner - RF

Passenger Presence System (PPS) Flash Code Procedure

1. Empty the front outboard passenger seat.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, request the PPS to flash DTCs.
5. When the PPS receives a valid request to flash DTCs, the PPS will perform the following: Illuminate both PASSENGER AIR BAG ON and OFF indicators located on the center of IPC for 1 second. Turn OFF both PASSENGER AIR BAG ON and OFF indicators for 1 second. Flash the first number of the DTC using the OFF indicator. This will be an ODD number. Count the number of times the OFF indicator flashes to obtain the first number of the DTC. Flash the second number of the DTC using the ON indicator. This will be an Even number. Count the number of times the ON indicator flashes to obtain the second number of the DTC. When the flashing procedure is initiated, to determine if a code is current or history, the PPS will flash current DTCs two times consecutively and flash history DTCs once.
6. If the flashing procedure was unsuccessful repeat this procedure. Due to the communication status between the SDM and the PPS module, this procedure may have to be repeated until a successful flashing attempt has been achieved.
7. Refer to the «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-241670-S33247835882006081100000) in Vehicle DTC Information, to diagnose the DTCs you have obtained.

Passenger Presence System (PPS) Rezeroing Procedure

1. Empty the front outboard passenger seat.
2. Verify that all supplemental inflatable restraint (SIR) and PPS components, connectors and connector position assurances (CPAs) are properly connected and mounted.
3. Install a scan tool.
4. Turn ON the ignition, with the engine OFF.
5. Use the scan tool in order to clear the SIR and PPS DTCs.
6. With a scan tool, request the PPS rezeroing procedure.
7. Initiate the PPS rezeroing procedure. The PPS will illuminate both PASSENGER AIR BAG ON and OFF indicators located on the rearview mirror until the rezeroing procedure has been completed. When the rezeroing procedure has been successfully completed, the PPS will display the current system status at the rearview mirror indicator. If the rezeroing procedure was unsuccessful, both PASSENGER AIR BAG ON and OFF indicators located on the rearview mirror will alternate from no illumination to full illumination in 1 second intervals for 5 seconds. The PPS will treat an unsuccessful rezero attempt as a system fault.
8. If the rezeroing procedure was unsuccessful, repeat this procedure. Due to the communication status between the sensing and diagnostic module (SDM) and the PPS module, this procedure may have to be repeated until a successful rezero attempt has been achieved.
9. After the PPS has been successfully rezeroed, perform the «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) in Vehicle DTC Information.

Symptoms - SIR

1. Perform «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) in Vehicle DTC Information, before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The inflatable restraint sensing and diagnostic module (SDM) can communicate via the serial data link.
2. Review the SIR system description and operation in order to familiarize yourself with the system functions. Refer to «SIR System Description and Operation»(ref-241682-S17364044892006081100000) .

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

SIR Disabling and 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. Refer to SIR Zone Identification Views . Refer to the illustration below, to identify the specific zone or zones in which service will be performed. After identifying the zone or zones, proceed to the disabling and enabling procedures for that particular zone or zones.

Scheme 30

SIR Disabling and Enabling Zones

SIR Service Precautions

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

1. Do not expose inflator modules to temperatures above 65°C (150°F).
2. Verify the correct replacement part number. Do not substitute a component from a different vehicle.
3. Use only original GM replacement parts available from your authorized GM dealer. Do not use salvaged parts for repairs to the supplemental inflatable restraint (SIR) system.

Discard any of the following components if it has been dropped from a height of 91 cm (3 ft) or greater

1. Inflatable restraint instrument panel (I/P) module
2. Inflatable restraint steering wheel module
3. Inflatable restraint steering wheel module coil
4. Inflatable restraint sensing and diagnostic module (SDM)
5. Inflatable restraint side impact modules
6. Inflatable restraint front end sensors
7. Inflatable restraint side impact sensors (SIS)
8. Inflatable restraint seat belt retractor pretensioners
9. Inflatable restraint passenger presence system (PPS)

Disabling Procedure

1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition switch.
4. Open the hood and locate the underhood fuse center.
5. Lift the cover for the underhood fuse center.
6. Locate and remove the air bag fuse from the underhood fuse center.
7. Open the front hood and locate both right and left front end sensors (1), also known as the electronic front sensor (EFS).
8. Remove both connector position assurances (CPAs) from the right and left front end sensor.
9. Disconnect both front end sensor wiring harness connectors from the left and right front end sensor (1).

Enabling Procedure

1. Remove the key from the ignition.
2. Connect both front end sensor wiring harness connectors to the left and right front end sensor (1).
3. Install the CPAs to the left and right front end sensor connector.
4. Install the Air Bag Fuse.
5. Install the cover for the underhood fuse center.
6. Use caution while reaching in and turning the ignition switch to the ON position. The AIR BAG indicator will flash, then turn OFF.
7. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) in Vehicle DTC Information.

1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition switch.
4. Open the hood and locate the underhood fuse center.
5. Lift the cover for the underhood fuse center.
6. Locate and remove the air bag fuse from the underhood fuse center.
7. Remove the driver/left lower center pillar trim cover. Refer to «Trim Panel Replacement - Lower Center Pillar»(ref-241679-S03977818532006081100000) in Interior Trim.
8. Loosen the left side impact sensor (SIS) fasteners, then slide the left SIS (1) up and remove the sensor from the center pillar.
9. Remove the connector position assurance (CPA) (3) from the SIS connector (2).
10. Disconnect the SIS wiring harness connector (2) from the SIS (1).
11. Remove the CPA from the driver/left seat belt retractor pretensioner connector.
12. Remove the vehicle wiring harness connector from the left seat belt retractor pretensioner.

1. Remove the key from the ignition.
2. Connect the vehicle wiring harness connector to the left seat belt retractor pretensioner.
3. Install the CPA to the left seat belt retractor pretensioner connector.
4. Connect the left SIS wiring harness connector (2) to the left SIS (1).
5. Install the CPA (3) to the SIS connector (1).
6. Position the SIS (1) back inside the center pillar and slide back into place and tighten the SIS fasteners.
7. Install the left lower center pillar trim cover. Refer to «Trim Panel Replacement - Lower Center Pillar»(ref-241679-S03977818532006081100000) in Interior Trim.
8. Install the Air Bag Fuse.
9. Install the cover for the underhood fuse center.
10. Use caution while reaching in and turning the ignition switch to the ON position. The AIR BAG indicator will flash, then turn OFF.
11. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) in Vehicle DTC Information.

1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition switch.
4. Open the hood and locate the underhood fuse center.
5. Lift the cover for the underhood fuse center.
6. Locate and remove the air bag fuse from the underhood fuse center.
7. Remove the driver/left instrument panel (I/P) insulator panel. Refer to «Knee Bolster, Insulator, Molding Replacement - Instrument Panel»(ref-241678-S36361698522006081100000) in Instrument Panel, Gages and Console.
8. Remove the connector position assurance (CPA) from the steering wheel module coil yellow connector (1) located at the base of the steering column.
9. Disconnect the steering wheel module coil connector (1).

1. Remove the key from the ignition.
2. Connect the steering wheel module coil yellow connector (1).
3. Install the CPA to the steering wheel module coil connector (1) located at the base of the steering column.
4. Install the left I/P insulator panel. Refer to «Knee Bolster, Insulator, Molding Replacement - Instrument Panel»(ref-241678-S36361698522006081100000) in Instrument Panel, Gages and Console.
5. Install the Air Bag Fuse.
6. Install the cover for the underhood fuse center.
7. Use caution while reaching in and turning the ignition switch to the ON position. The AIR BAG indicator will flash, then turn OFF.
8. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) in Vehicle DTC Information.

1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition switch.
4. Open the hood and locate the underhood fuse center.
5. Lift the cover for the underhood fuse center.
6. Locate and remove the air bag fuse from the underhood fuse center.
7. Remove the passenger/right instrument panel (I/P) insulator panel. Refer to «Knee Bolster, Insulator, Molding Replacement - Instrument Panel»(ref-241678-S36361698522006081100000) in Instrument Panel, Gages and Console.
8. Remove the connector position assurance (CPA) (2) from the I/P module yellow connector (1).
9. Disconnect the I/P module connector (1).

1. Remove the key from the ignition.
2. Connect the I/P module yellow connector (1).
3. Install the CPA (2) to the I/P module connector (1).
4. Install the right I/P insulator panel. Refer to «Knee Bolster, Insulator, Molding Replacement - Instrument Panel»(ref-241678-S36361698522006081100000) in Instrument Panel, Gages and Console.
5. Install the Air Bag Fuse.
6. Install the cover for the underhood fuse center.
7. Use caution while reaching in and turning the ignition switch to the ON position. The AIR BAG indicator will flash, then turn OFF.
8. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) in Vehicle DTC Information.

1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition switch.
4. Open the hood and locate the underhood fuse center.
5. Lift the cover for the underhood fuse center.
6. Locate and remove the air bag fuse from the underhood fuse center.
7. Remove the passenger/right lower center pillar trim cover. Refer to «Trim Panel Replacement - Lower Center Pillar»(ref-241679-S03977818532006081100000) in Interior Trim.
8. Loosen the right side impact sensor (SIS) fasteners, then slide the right SIS (1) up and remove from the center pillar.
9. Remove the connector position assurance (CPA) (3) from the SIS connector (2).
10. Disconnect the SIS wiring harness connector (2) from the SIS (1).
11. Remove the CPA from the passenger/right seat belt retractor pretensioner connector.
12. Remove the vehicle wiring harness connector from the right seat belt retractor pretensioner.

1. Remove the key from the ignition.
2. Connect the vehicle wiring harness connector to the right seat belt retractor pretensioner.
3. Install the CPA to the right seat belt retractor pretensioner connector.
4. Connect the right SIS wiring harness connector (2) to the right SIS (1).
5. Install the CPA (3) to the SIS connector (1).
6. Position SIS (1) back inside the center pillar and slide back into place and tighten the SIS fasteners.
7. Install the right lower center pillar trim cover. Refer to «Trim Panel Replacement - Lower Center Pillar»(ref-241679-S03977818532006081100000) in Interior Trim.
8. Install the Air Bag Fuse.
9. Install the cover for the underhood fuse center.
10. Use caution while reaching in and turning the ignition switch to the ON position. The AIR BAG indicator will flash, then turn OFF.
11. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) in Vehicle DTC Information.

1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition switch.
4. Open the hood and locate the underhood fuse center.
5. Lift the cover for the underhood fuse center.
6. Locate and remove the air bag fuse from the underhood fuse center.
7. Remove the connector position assurance (CPA) (3) from the LF/driver side impact module yellow connector (3) which is located under the driver seat.
8. Disconnect the vehicle harness connector (4) from the LF side impact module connector (1).

1. Remove the key from the ignition.
2. Connect the vehicle harness connector (4) to the LF side impact module yellow connector (1).
3. Install the CPA to the LF side impact module connector (1).
4. Install the Air Bag Fuse.
5. Install the cover for the underhood fuse center.
6. Use caution while reaching in and turning the ignition switch to the ON position. The AIR BAG indicator will flash, then turn OFF.
7. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) in Vehicle DTC Information.

1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition switch.
4. Open the hood and locate the underhood fuse center.
5. Lift the cover for the underhood fuse center. IMPORTANT: With the Air Bag Fuse removed and the ignition ON, the AIR BAG indicator illuminates. This is normal operation and does not indicate an SIR system malfunction.
6. 6. Locate and remove the air bag fuse from the underhood fuse center.
7. 7. When disabling only the side impact module - RF proceed to step 26. If the entire SIR System needs to be disabled, then go to step 8.
8. Remove the driver/left lower center pillar trim cover. Refer to «Trim Panel Replacement - Lower Center Pillar»(ref-241679-S03977818532006081100000) .
9. Remove the connector position assurance (CPA) from the driver/left seat belt retractor pretensioner connector.
10. Remove the vehicle wiring harness connector from the left seat belt retractor pretensioner.
11. Remove the driver/left instrument panel (I/P) insulator panel. Refer to «Knee Bolster, Insulator, Molding Replacement - Instrument Panel»(ref-241678-S36361698522006081100000) .
12. Remove the CPA from the steering wheel module coil yellow connector (1), located at the base of the steering column.
13. Disconnect the steering wheel module coil connector (1).
14. Remove the CPA (3) from the LF/driver side impact module yellow connector (3), which is located under the driver seat.
15. Disconnect the vehicle harness connector (4) from the LF side impact module connector (1).
16. Remove the CPA (3) from the LR side impact module yellow connector (3), which is located under the LR seat.
17. Disconnect the vehicle harness connector (4) from the LR side impact module connector (1).
18. Remove the passenger/right instrument panel (I/P) insulator panel. Refer to «Knee Bolster, Insulator, Molding Replacement - Instrument Panel»(ref-241678-S36361698522006081100000) .
19. Remove the CPA (2) from the I/P module yellow connector (1).
20. Disconnect the I/P module connector (1).
21. Remove the passenger/right lower center pillar trim cover. Refer to «Trim Panel Replacement - Lower Center Pillar»(ref-241679-S03977818532006081100000) .
22. Remove the CPA from the right seat belt retractor pretensioner connector.
23. Remove the vehicle wiring harness connector from the right seat belt retractor pretensioner.
24. Remove the CPA (3) from the RR side impact module yellow connector (3), which is located under the RR seat.
25. Disconnect the vehicle harness connector (4) from the RR side impact module connector (1).
26. Remove the CPA (3) from the RF/passenger side impact module yellow connector (3), which is located under the passenger seat.
27. Disconnect the vehicle harness connector (4) from the RF side impact module connector (1).

1. Remove the key from the ignition.
2. When enabling the side impact module - RF proceed to step 21. If the entire SIR System needs to be enabled, then go to step 3.
3. Connect the vehicle wiring harness connector to the left seat belt retractor pretensioner.
4. Install the CPA to the left seat belt retractor pretensioner connector.
5. Install the left lower center pillar trim cover. Refer to «Trim Panel Replacement - Lower Center Pillar»(ref-241679-S03977818532006081100000)
6. Connect the steering wheel module coil yellow connector (1).
7. Install the CPA to the steering wheel module coil connector (1), located at the base of the steering column.
8. Install the left I/P insulator panel. Refer to «Knee Bolster, Insulator, Molding Replacement - Instrument Panel»(ref-241678-S36361698522006081100000) .
9. Connect the vehicle harness connector (4) to the LF side impact module yellow connector (1).
10. Install the CPA to the LF side impact module connector (1).
11. Connect the vehicle harness connector (4) to the LR side impact module yellow connector (1).
12. Install the CPA to the LR side impact module connector (1).
13. Connect the I/P module yellow connector (1).
14. Install the CPA (2) to the I/P module connector (1).
15. Install the right I/P insulator panel. Refer to «Trim Panel Replacement - Lower Center Pillar»(ref-241679-S03977818532006081100000) .
16. Connect the vehicle wiring harness connector to the right seat belt retractor pretensioner.
17. Install the CPA to the right seat belt retractor pretensioner connector.
18. Install the right lower center pillar trim cover. Refer to «Trim Panel Replacement - Lower Center Pillar»(ref-241679-S03977818532006081100000) .
19. Connect the vehicle harness connector (4) to the RR side impact module yellow connector (1).
20. Install the CPA to the RR side impact module connector (1).
21. Connect the vehicle harness connector (4) to the RF side impact module yellow connector (1).
22. Install the CPA to the RF side impact module connector (1).
23. Install the Air Bag Fuse.
24. Install the cover for the underhood fuse center.
25. Use caution while reaching in and turning the ignition switch to the ON position. The AIR BAG indicator will flash, then turn OFF.
26. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) .

1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition switch.
4. Open the hood and locate the underhood fuse center.
5. Lift the cover for the underhood fuse center.
6. Locate and remove the air bag fuse from the underhood fuse center.
7. Remove the connector position assurance (CPA) (3) from the LR side impact module yellow connector (3) which is located under the driver seat.
8. Disconnect the vehicle harness connector (4) from the LR side impact module connector (1).

1. Remove the key from the ignition.
2. Connect the vehicle harness connector (4) to the LR side impact module yellow connector (1).
3. Install the CPA to the LR side impact module connector (1).
4. Install the Air Bag Fuse.
5. Install the cover for the underhood fuse center.
6. Use caution while reaching in and turning the ignition switch to the ON position. The AIR BAG indicator will flash, then turn OFF.
7. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) .

1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead.
2. Turn OFF the ignition.
3. Remove the key from the ignition switch.
4. Open the hood and locate the underhood fuse center.
5. Lift the cover for the underhood fuse center.
6. Locate and remove the air bag fuse from the underhood fuse center.
7. Remove the connector position assurance (CPA) (3) from the RR side impact module yellow connector (3) which is located under the driver seat.
8. Disconnect the vehicle harness connector (4) from the RR side impact module connector (1).

1. Remove the key from the ignition.
2. Connect the vehicle harness connector (4) to the RR side impact module yellow connector (1).
3. Install the CPA to the RR side impact module connector (1).
4. Install the Air Bag Fuse.
5. Install the cover for the underhood fuse center.
6. Use caution while reaching in and turning the ignition switch to the ON position. The AIR BAG indicator will flash, then turn OFF.
7. Perform the Diagnostic System Check - Vehicle, if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) .

Scheme 31

Inflatable Restraint Front End Sensor Replacement

Scheme 32

Inflatable Restraint Side Impact Sensor Replacement

Scheme 33

Inflatable Restraint Sensing and Diagnostic Module Replacement

Scheme 34

Inflatable Restraint Steering Wheel Module Replacement

Scheme 35

Inflatable Restraint Steering Wheel Module Coil Replacement

Scheme 36

Inflatable Restraint Instrument Panel Module Replacement

Scheme 37

Inflatable Restraint Side Impact Module Replacement - Front

Frontal Inflator Module Deployment

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

1. Inflatable restraint I/P module, if deployed and after performing the necessary inspections listed above
2. Inflatable restraint steering wheel module
3. Inflatable restraint sensing and diagnostic module (SDM)
4. Inflatable restraint passenger presence system (PPS)
5. Inflatable restraint front end sensor, Left/Right
6. Inflatable restraint seat belt retractor pretensioner, Left/Right

Perform additional inspections on the following components.

1. Steering wheel module coil and the coil wiring pigtail-Inspect for melting, scorching or other damage due to excessive heat.
2. Mounting points or mounting hardware for the I/P module, steering wheel module, SDM and pretensioners-Inspect for any damage and repair or replace each component as needed.

Tools Required

1. J 38826 SIR Deployment Harness. See «Special Tools»(ref-241682-S18321121592006081100000) .
2. J 39401-B Deployment Fixture. See «Special Tools»(ref-241682-S18321121592006081100000) .
3. J 38826-25 Side Impact Module Adapter
4. J 38826-75 Steering Wheel Module Adapter (Dual Stage Air Bags)
5. J 38826-80 I/P Module Adapter (Dual Stage Air Bags)

Live and Undeployed Inflator Module

Scheme 38

Take special care when handling or storing a live (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.

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 inflator module must still be treated as an active inflator module. If disposal of a deployed or undeployed dual stage module is required, both deployment loops must be energized to deploy the inflator module.

Scrapping Procedure

During the course of a vehicle's 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. If scrapping a deployed dual stage inflator module, both stages must be energized. The following information covers the proper procedures for disposing of a live and undeployed inflator module. Do not deploy the inflator module in the following situations

1. After replacement of an inflator module under warranty-The inflator module may need to be returned undeployed to the manufacturer.
2. If the vehicle is the subject of a product liability report, GM-1241, related to the SIR or seat belt system-When a vehicle is the subject of a product liability report, do not alter the SIR or seat belt system in any manner.
3. 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

The inflator module can be deployed 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 & Side Impact 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

1. Using the SIR diagnostics, you determine that the inflator module is malfunctioning.
2. The inflator module is cosmetically damaged, scratched or ripped.
3. The inflator module pigtail, if equipped, is damaged.
4. The inflator module connector is damaged.
5. The inflator module connector terminals are damaged.

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

1. Turn OFF the ignition.
2. Remove the ignition key.
3. Put on safety glasses.
4. Remove the inflator module. Refer to the following: If you are removing the steering wheel module, refer to «Inflatable Restraint Steering Wheel Module Replacement»(ref-241682-S23948417932006081100000) . If you are removing the instrument panel (I/P) module, refer to «Inflatable Restraint Instrument Panel Module Replacement»(ref-241682-S32109543972006081100000) . If you are removing the side impact module (left and/or right), refer to «Inflatable Restraint Side Impact Module Replacement - Front»(ref-241682-S00725692522006081100000) or «Inflatable Restraint Side Impact Module Replacement - Rear»(ref-241682-S38512346932006081100000) .
5. Place the inflator module with the vinyl trim cover facing up and away from the surface on a work bench.
6. Clear a space on the ground about 1.85 m (6 ft) in diameter for deployment of the inflator module or deployment fixture. If possible, use a paved, outdoor location free of activity. Otherwise, use a space free of activity on the shop floor. Make sure you have sufficient ventilation.
7. Make sure no loose or flammable objects are in the area.
8. If you have a steering wheel inflator module, place the inflator module in the center of the space.
9. If you have an I/P inflator module, refer to the following instructions: Place the J 39401-B (2) in the center of the cleared area. See «Special Tools»(ref-241682-S18321121592006081100000) . Fill the deployment fixture with water or sand. Using the proper nuts and bolts, mount the I/P module (1) to the deployment fixture (2), with the vinyl trim facing up. Tighten all fasteners that hold the I/P module (1) to the deployment fixture (2).
10. If you have a side impact module, refer to the following instructions: Place the J 39401-B (3) in the center of the cleared area. See «Special Tools»(ref-241682-S18321121592006081100000) . Fill the deployment fixture with water or sand. Using the proper nuts and mount the side impact module (1) to the deployment fixture (3), with the vinyl trim facing up. Adjust and secure the fixture arms (4) to the deployment fixture (3). Tighten all fasteners that hold the side impact module (1) to the deployment fixture (3).
11. Inspect the J 38826 and the appropriate pigtail adapter for damage. See «Special Tools»(ref-241682-S18321121592006081100000) . Replace as needed.
12. Short the 2 SIR deployment harness leads (1) together using one banana plug seated into the other.
13. Connect the appropriate pigtail adapter (2) to the SIR deployment harness (1).
14. Extend the SIR deployment harness and adapter to full length from the deployment fixture.
15. Connect the inflator module to the adapter (2) on the SIR deployment harness (1).
16. Place a 12 volt minimum/2 amp minimum power source, i.e., vehicle battery, near the shorted end of the harness.
17. Clear the area of people.
18. Separate the 2 banana plugs on the SIR deployment harness.
19. Connect the SIR deployment harness wires to the power source. Inflator module deployment will occur when contact is made.
20. Disconnect the SIR deployment harness from the power source after the inflator module deploys.
21. If the inflator module did not deploy, disconnect the adapter and discontinue the procedure. Contact the Technical Assistance Group. Otherwise, proceed to the following steps.
22. Seat one banana plug into the other in order to short the deployment harness leads.
23. Put on a pair of shop gloves.
24. Disconnect the pigtail adapter from the inflator module as soon as possible.
25. Inspect the pigtail adapter and the SIR deployment harness. Replace as needed.
26. Dispose of the deployed inflator module through normal refuse channels.
27. Wash hands with a mild soap.

Deployment Inside Vehicle - Vehicle Scrapping Procedure

Deploy the inflator modules inside of the vehicle when destroying the vehicle or when salvaging the vehicle for parts. This includes but is not limited to the following situations

1. The vehicle has completed its useful life.
2. Irreparable damage occurs to the vehicle in a non-deployment type accident.
3. Irreparable damage occurs to the vehicle during a theft.
4. The vehicle is being salvaged for parts to be used on a vehicle with a different VIN as opposed to rebuilding as the same VIN.

1. Turn the ignition switch to the OFF position.
2. Remove the ignition key.
3. Put on safety glasses.
4. Remove all loose objects from the front seats.
5. Disable the SIR System. Refer to «SIR Disabling and Enabling Zones»(ref-241682-S07878378982006081100000) .
6. Disconnect the steering wheel module yellow connector (4) located next to steering column (2).
7. Cut the yellow harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
8. Strip 13 mm (0.5 in) of insulation from each of the connector wire leads.
9. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gage) or thicker multi-strand wire. Use these wires to fabricate the driver deployment harness.
10. Strip 13 mm (0.5 in) of insulation from both ends of the wires cut in the previous step.
11. Twist together one end from each of the wires in order to short the wires. Deployment wires shall remain shorted and not connected to a power source until you are ready to deploy the inflator module.
12. Twist together the 2 connector wire leads of the high circuits from both stages of the steering wheel module to one of the deployment harness wires. Refer to «SIR Connector End Views»(ref-241682-S06656447302006081100000) in order to determine the correct circuits.
13. Inspect that the 3 wire connection is secure.
14. Bend flat the twisted connection.
15. Secure and insulate the 3-wire connection to deployment harness using electrical tape.
16. Twist together 2 connector wire leads of the low circuits from both stages of the steering wheel module to one sets of deployment wires. Refer to «SIR Connector End Views»(ref-241682-S06656447302006081100000) in order to determine the correct circuits.
17. Inspect that the 3 wire connection is secure.
18. Bend flat the twisted connection.
19. Secure and insulate the 3-wire connection to deployment harness using electrical tape.
20. Connect the deployment harness to the steering wheel module in-line connector.
21. Route the deployment harness out of the driver side of the vehicle.
22. Disconnect the driver side impact module yellow connector (1) from the vehicle wiring harness (4) located under the driver seat.
23. Cut the 2 side impact module wires leading to the yellow harness connector, leaving at least 16 cm (6 in) of wire at the connector.
24. Strip 13 mm (0.5 in) of insulation from each of the side impact module connector wire leads.
25. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gage) or thicker multi-strand wire. Use these wires to fabricate the deployment harness.
26. Strip 13 mm (0.5 in) of insulation from both ends of the wires cut in the previous step.
27. Twist together one end from each of the wires in order to short the wires. Deployment wires shall remain shorted and not connected to a power source until you are ready to deploy the side impact module.
28. Twist together one connector wire lead to one deployment wire.
29. Inspect that the previous connection is secure.
30. Bend flat the twisted connection.
31. Secure and insulate the connection using electrical tape.
32. Twist together, bend and tape the remaining connector wire lead to the remaining deployment wire.
33. Connect the deployment harness to the side impact module LF.
34. Route the deployment harness out of the driver side of the vehicle.
35. Disconnect the I/P module yellow harness connector (2) above passenger side sound insulator.
36. Cut the yellow harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
37. Strip 13 mm (0.5 in) of insulation from each of the connector wire leads.
38. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gage) or thicker multi-strand wire. These wires will be used to fabricate the passenger deployment harness.
39. Strip 13 mm (0.5 in) of insulation from both ends of the wires cut in the previous step.
40. Twist together one end from each of the wires in order to short the wires.
41. Twist together the 2 connector wire leads of the high circuits from both stages of the I/P module to one of the deployment harness wires. Refer to «SIR Connector End Views»(ref-241682-S06656447302006081100000) in order to determine the correct circuits.
42. Ensure the 3-wire connection is secure.
43. Bend flat the twisted connection.
44. Secure and insulate the 3-wire connection to deployment harness using electrical tape.
45. Twist together the two connector wire leads of the low circuits from both stages of the I/P module to the deployment harness wire. Refer to «SIR Connector End Views»(ref-241682-S06656447302006081100000) in order to determine the correct circuits.
46. Ensure the 3-wire connection is secure.
47. Bend flat the twisted connection.
48. Secure and insulate the 3-wire connection to deployment harness using electrical tape.
49. Connect the deployment harness to the I/P module in-line connector.
50. Route the deployment harness out of the passenger side of the vehicle.
51. Disconnect the passenger side impact module yellow connector (1) from the vehicle wiring harness (4) located under the passenger seat.
52. Cut the 2 side impact module wires leading to the yellow harness connector, leaving at least 16 cm (6 in) of wire at the connector.
53. Strip 13 mm (0.5 in) of insulation from each of the side impact module connector wire leads.
54. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gage) or thicker multi-strand wire. Use these wires to fabricate the deployment harness.
55. Strip 13 mm (0.5 in) of insulation from both ends of the wires cut in the previous step.
56. Twist together one end from each of the wires in order to short the wires. Deployment wires shall remain shorted and not connected to a power source until you are ready to deploy the side air bag module.
57. Twist together one connector wire lead to one deployment wire.
58. Inspect that the previous connection is secure.
59. Bend flat the twisted connection.
60. Secure and insulate the connection using electrical tape.
61. Twist together, bend and tape the remaining connector wire lead to the remaining deployment wire.
62. Connect the deployment harness to the side impact module RF.
63. Route the deployment harness out of the passenger side of the vehicle.
64. Completely cover the windshield and front door window openings with a drop cloth.
65. Stretch out all of the deployment harness wires on the left and right side of the vehicle to their full length.
66. Deploy each deployment loop one at a time.
67. Place a power source, 12-volt minimum/2-amp minimum, i.e., a vehicle battery, near the shorted end of the harnesses.
68. Separate the one set of wires and touch the wires ends to the power source in order to deploy the inflator modules, doing one module at a time.
69. Disconnect the deployment harness from the power source and twist the wire ends together.
70. Continue the same process with the remaining deployment harnesses that are available.
71. Remove the drop cloth from the vehicle.
72. Disconnect all harnesses from the vehicle.
73. Discard the harnesses.
74. Scrap the vehicle in the same manner as a non-SIR equipped vehicle.
75. If one or all of the inflator modules did not deploy, perform the following steps to remove the undeployed modules from the vehicle: If the steering wheel module did not deploy, refer to «Inflatable Restraint Steering Wheel Module Replacement»(ref-241682-S23948417932006081100000) . If the I/P module did not deploy, refer to «Inflatable Restraint Instrument Panel Module Replacement»(ref-241682-S32109543972006081100000) . If the side impact module (left and/or right) did not deploy, refer to «Inflatable Restraint Side Impact Module Replacement - Front»(ref-241682-S00725692522006081100000) or «Inflatable Restraint Side Impact Module Replacement - Rear»(ref-241682-S38512346932006081100000) .
76. Call Technical Assistance Group.

1. J 38826 SIR Deployment Harness. See «Special Tools»(ref-241682-S18321121592006081100000) .
2. J 38826-25 for Seat Belt Pretensioner Module Adapter
3. J 39401-B SIR Deployment Fixture. See «Special Tools»(ref-241682-S18321121592006081100000) .

During the course of a vehicle's useful life, certain situations may arise which will necessitate the disposal of a live (undeployed) pretensioner. The following information covers the proper procedures for the disposing of a live (undeployed) pretensioner. Deploy the pretensioner before disposal. Do not dispose of a live (undeployed) pretensioner through normal disposal channels until the pretensioner has been deployed. The following information covers the proper procedures for the disposing of a live (undeployed) pretensioner.

1. After replacement of a pretensioner under warranty-The pretensioner may need to be returned undeployed to the original manufacturer of pretensioner.
2. If the vehicle is the subject of a Product Liability report related to the supplemental inflatable restraint (SIR) system and is subject to a Preliminary Investigation (GM-1241)-Do not alter the SIR system in any manner.
3. If the vehicle is involved in a campaign affecting the pretensioners-Follow the instructions in the Campaign Service Bulletin for proper SIR handling procedures.

The pretensioner can be deployed 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 Inside the Vehicle

Refer to Inflator Module Handling and Scrapping for deploying the pretensioner retractor inside vehicle in Vehicle Scrapping Procedure.

Deployment Outside Vehicle for Seat Belt Retractor Pretensioners

Deploy the seat belt pretensioners outside of the vehicle when the vehicle will be returned to service. Situations that require deployment outside of the vehicle include the following

1. Using the SIR diagnostics, you determine that the seat belt pretensioner is malfunctioning.
2. The pretensioner pigtail is damaged.
3. The pretensioner connector is damaged.
4. The pretensioner connector terminal is damaged.

Deployment and disposal of a malfunctioning seat belt pretensioner is subject to any required retention period.

1. Turn the ignition switch to the OFF position.
2. Remove the ignition key.
3. Put on safety glasses.
4. Remove the seat belt retractor pretensioner from the vehicle. Refer to «Seat Belt Retractor Pretensioner Replacement - Left Front»(ref-241682-S06575738352006081100000) or «Seat Belt Retractor Pretensioner Replacement - Right Front»(ref-241682-S01692276142006081100000) .
5. When carrying a pretensioner to the deployment area, keep the open end of pretensioner pointed away from the body.
6. Clear a space on the ground about 1.85 M (6 ft) in diameter for deployment of the pretensioner. If possible, use a paved, outdoor location free of activity. Otherwise, use a space free of activity on the shop floor. Make sure you have sufficient ventilation.
7. Make sure no loose or flammable objects are in the area.
8. Place J 39401-B in the center of the cleared area. See «Special Tools»(ref-241682-S18321121592006081100000) .
9. Fill the fixture plastic reservoir with water or sand.
10. Mount the module (1) in the SIR deployment fixture (3) with the open end facing up using the following mounting method. Adjust and secure the arms (4) of J 39401-B to the deployment fixture (3). See «Special Tools»(ref-241682-S18321121592006081100000) . To mount, use the proper size bolt (2) and nut (5) with washers in order to secure the pretensioner (1) to the deployment fixture brackets (4). Securely tighten all fasteners prior to deployment.
11. Inspect the J 38826 and the appropriate pigtail adapter for damage. See «Special Tools»(ref-241682-S18321121592006081100000) . Replace as needed.
12. Short the 2 SIR deployment harness (1) leads together using one banana plug seated into the other.
13. Connect the appropriate pigtail adapter (2) to the SIR deployment harness (1).
14. Extend the SIR deployment harness and adapter to full length from the deployment fixture.
15. Connect the pretensioner (1) to the adapter (2) on the deployment harness (3).
16. Clear the area of people.
17. Separate the 2 banana plugs on the SIR deployment harness.
18. Place a 12-volt minimum/2-amp minimum power source, such as a vehicle battery, near the shorted end of the harness.
19. Connect the SIR deployment harness wires to the power source. Pretensioner deployment will occur when contact is made.
20. Disconnect the SIR deployment harness from the power source after the pretensioner deploys.
21. Seat 1 banana plug into the other in order to short the deployment harness leads.
22. If the pretensioner did not deploy, disconnect the adapter and discontinue the procedure. Contact the Technical Assistance Group. Otherwise, proceed to the following steps.
23. Put on a pair of shop gloves.
24. Disconnect the pigtail adapter from the pretensioner as soon as possible.
25. Inspect the pigtail adapter and the SIR deployment harness. Replace as needed.
26. Dispose of the deployed pretensioner through normal refuse channels.
27. Wash your hands with a mild soap.

Scheme 39

The supplemental inflatable restraint (SIR) system supplements the protection offered by the occupants seat belt system (2). The SIR system may contain several inflator modules located throughout the vehicle, i.e. steering wheel module (1), instrument panel (I/P) module (1) or side impact modules. In addition to inflator modules, the vehicle may contain seat belt pretensioners that tighten the seat belt in the event of a collision, thus reducing the distance between the occupant and the seat belt when an inflator module is deployed. Each inflator module has a deployment loop that is controlled by the sensing and diagnostic module (SDM) mounted inside the vehicle. The SDM determines the severity of a collision with the assistance of various sensor inputs located at strategic points on the vehicle. When the SDM detects a collision of sufficient force it will process the information provided by the sensors to further support air bag deployment. The SDM performs continuous diagnostic monitoring of the SIR system electrical components. Upon detection of a circuit malfunction, the SDM will set a DTC and inform the driver by turning the AIR BAG indicator ON. The steering column (1) and knee bolsters (3) are designed to absorb energy and compress during frontal collisions in order to limit leg movement and decrease the chance of injury to the driver and passenger. After an air bag deployment, the SDM will send out a post-air message to the body control module (BCM). The BCM will unlock the doors and turn ON the interior lights 15 seconds after receipt of this message.

Inflatable Restraint Passenger Presence System (PPS)

The PPS is used to monitor the weight of an occupant on the front outboard passenger seat and communicate the status to the sensing and diagnostic module (SDM) whether to enable or suppress the deployment of the instrument panel (I/P) module. The PPS consist of an electronic control module, silicone filled sensor pad, pressure sensor, seat belt tension retractor sensor, I/P module disable switch, wiring harness and PASSENGER AIR BAG ON/OFF indicators. The silicone filled sensor pad is located under the passenger seat foam cushion and is connected by a hose clamped to the pressure sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder by the pressure sensor. The pressure sensor sends a voltage signal to the PPS module. If the pressure from the occupants weight is less than a specified value, the PPS module will send a suppress signal to the SDM to disable the I/P module. If the pressure from the occupants weight is higher than a specified value, the PPS module will send an enable signal to the SDM to enable the I/P module. The PPS module will notify the customer of the enable/disable status by turning ON one of the PASSENGER AIR BAG ON/OFF indicators located in the center of I/P. The PPS monitors itself for faults and will set DTCs if a fault is detected. The PPS will also notify the SDM of a fault and the SDM will request the instrument panel cluster (IPC) to turn ON the AIR BAG indicator located on the IPC. To determine what DTCs have been set by the PPS, the scan tool is used to command the SDM to request the PPS to flash the DTCs using the PASSENGER AIR BAG ON/OFF indicators located in the center of I/P.

Inflatable Restraint PASSENGER AIR BAG ON/OFF Indicator

The PASSENGER AIR BAG ON/OFF indicators located in the center of the instrument panel cluster (IPC), is used to notify the driver and passenger when the I/P air bag is enable or disable. The PASSENGER AIR BAG ON/OFF indicators are also used to display any faults/DTCs, when the sensing and diagnostic module (SDM) sends a command to the passenger presence system (PPS), the PPS will flash the ON/OFF indicators. The PPS will flash the first number of the DTC using the OFF indicator. This will be an ODD number, then flash the second number of the DTC using the ON indicator. For more information on this flash procedure refer to Passenger Presence System Flash Code Procedures .

AIR BAG Indicator

The AIR BAG indicator, located in the instrument panel cluster (IPC), is used to notify the driver of supplemental inflatable restraint (SIR) system malfunctions and to verify that the sensing and diagnostic module (SDM) is communicating with the IPC. When the ignition is turned ON, the SDM is supplied with ignition positive voltage. The SDM requests the IPC to flash the AIR BAG indicator 7 times. While flashing the indicator, the SDM conducts test on all SIR system components and circuits. If no malfunctions are detected the SDM will communicate with the IPC through the class 2 serial data circuit and command the AIR BAG indicator OFF. The SDM provides continuous monitoring of the air bag circuits by conducting a sequence of checks. If a malfunction is detected, the SDM will store a DTC and command the IPC to turn the AIR BAG indicator ON via class 2 serial data and a SERVICE AIR BAG message will be display on the driver information center (DIC). The presence of a SIR system malfunction could result in non-deployment of the air bags or deployment in conditions less severe than intended. The AIR BAG indicator and the SERVICE AIR BAG message on the DIC will remain ON until the malfunction has been repaired.

Dual Stage Inflator Modules

Dual stage inflator modules contain a housing, inflatable air bag, 2 initiating devices, a canister of gas generating material and in some cases, stored compressed gas. The 2 initiators are part of the frontal deployment loop. The function of the frontal deployment loops are to supply current through the steering wheel and instrument panel (I/P) inflator modules to deploy the air bags. The inflator modules have 2 stages of deployment, which varies the amount of restraint to the occupant according to the collision severity. For moderate frontal collisions, the inflator modules deploy at less than full deployment (low deployment) which consists of stage 1 of the inflator module. For more severe frontal collisions, a full deployment is initiated which consists of stage 1 and stage 2 of the inflator module. The current passing through the initiators ignites the material in the canister producing a rapid generation of gas and in some cases, the release of compressed gas. The gas produced from this reaction rapidly inflates the air bag. Once the air bag is inflated, it quickly deflates through the air bag vent holes and/or the bag fabric.

Each dual stage inflator modules is equipped with a shorting bar located in the connectors of the module. The shorting bar shorts the inflator module deployment loop circuitry to prevent unwanted deployment of the air bag when it is disconnected.

Inflatable Restraint Steering Wheel Module Coil

The steering wheel module coil is attached to the steering column and is located under the steering wheel. The steering wheel module coil consists of 2 or more current-carrying coils. The coils allow the rotation of the steering wheel while maintaining continuous electrical contact between the driver deployment loop and the steering wheel module. Two or 4, if equipped with dual stage air bags, coil wires are used for the steering wheel module deployment loop. Additional coil wires are used for accessories attached to the steering wheel depending on the vehicle model. The steering wheel module coil connector is located near the base of the steering column. The connector contains a shorting bar that shorts the steering wheel module coil deployment loop circuitry to prevent unwanted deployment of the air bag when servicing the inflator module.

Inflatable Restraint Front End Sensor

The front end sensor also known as the electronic frontal sensor (EFS) is equipped on vehicles to supplement the supplemental inflatable restraint (SIR) system performance. The front end sensor is an electronic sensor, accelerometer and is not part of the deployment loops, but instead provides an input to the sensing and diagnostic module (SDM). The front end sensor can assist in determining the severity of some frontal collisions. The SDM contains a microprocessor which performs calculations using the measured accelerations and compares these calculations to a value stored in memory. When the generated calculations exceed the stored value, the SDM will cause current to flow through the frontal deployment loops deploying the frontal air bags.

Inflatable Restraint Seat Belt Retractor Pretensioner

The seat belt retractor pretensioner contains a housing, an initiating device and a canister of gas generating material. The initiator is part of the seat belt pretensioner deployment loop. When the vehicle is involved in a collision of sufficient force, the sensing and diagnostic module (SDM) will cause current to flow through the deployment loops to the initiator. Current passing through the initiator ignites the material in the canister producing a rapid generation of gas and the release of compressed gas, if present. The gas produced from this reaction rapidly shortens the seat belt buckle height.

Each seat belt retractor pretensioner is equipped with a shorting bar located on the connector of the pretensioner. The shorting bar shorts the seat belt retractor pretensioner deployment loop circuitry to prevent unwanted deployment of the pretensioner when servicing the seat belt retractor pretensioner.

Steering Column and Wheel

The steering wheel and columns are designed to absorb energy when driver contact is made with the steering wheel or inflated air bag. In a frontal collision, the driver may come in contact with the steering wheel directly or load the steering wheel and column through the inflated air bag. When the driver applies load to the air bag or the steering wheel, the column will compress downward absorbing some of the impact, helping to reduce bodily injuries to the driver. The steering wheel and column must be inspected for damages after a collision.

Knee Bolster

The knee bolsters are designed to help restrain the lower torso of front seat occupants by absorbing the energy through the front seat occupants upper legs. In a frontal collision the front seat occupant legs may come in contact with the knee bolsters. The knee bolsters are designed to crush or deform, absorbing some of the impact, which helps to reduce bodily injuries. The driver and passenger knee bolsters are located in the lower part of the instrument panel and must be inspected for damages after a collision.

Inflatable Restraint Side Impact Modules

The side impact modules are located in the seat backs of driver and passenger front seat and rear bucket seats, if equipped. The side impact modules contain a housing, inflatable air bag, initiating device and a canister of gas generating material. The initiator is part of the side impact module deployment loop. When a side impact of sufficient force occurs, the side impact sensor (SIS) detects the impact and sends a signal to the sensing and diagnostic module (SDM). The SDM compares the signal received from the SIS to a value stored in memory. When the generated signal exceeds the stored value, the SDM will cause current to flow through the side impact air bags deployment loop. The SDM, side impact modules and the connecting wires makeup the side deployment loops. The SDM continuously monitors the deployment loops for malfunctions and turns the AIR BAG indicator ON if a fault is present.

Each side impact module is equipped with a shorting bar located on the connector of the module. The shorting bar shorts the side impact modules deployment loop circuitry to prevent unwanted deployment of the air bag when servicing the inflator module.

Inflatable Restraint Side Impact Sensor (SIS)

The side impact sensor (SIS) contains a sensing device which monitors vehicle acceleration and velocity changes to detect side collisions that are severe enough to warrant air bag deployment. The SIS is not part of the deployment loop, but instead provides an input to the sensing and diagnostic module (SDM). The SDM contains a microprocessor that performs calculations using the measured accelerations and compares these calculations to a value stored in memory. When the generated calculations exceed the stored value, the SDM will cause current to flow through the deployment loops deploying the side air bags.