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Supplemental Inflatable Restraint System Chevrolet Cavalier III

Airbag 17 illustrations ~12491 words

DESCRIPTION & OPERATION

WARNINGTo avoid injury from accidental air bag deployment, read and carefully follow all WARNINGS and AIR BAG SAFETY PRECAUTIONS .

SUPPLEMENTAL INFLATABLE RESTRAINT (SIR) SYSTEM

Supplemental Inflatable Restraint (SIR) system is designed to supplement protection provided by driver and passenger-side seat belts. A frontal crash of sufficient force up to 30 degrees off center line of vehicle will deploy driver and passenger-side air bags. Steering column and knee bolsters below instrument panel also absorb crash energy.

SIR system consists of Sensing and Diagnostic Module (SDM), driver and passenger-side air bag modules, SIR coil assembly, front-end discriminating sensor and AIR BAG warning light in instrument cluster.

SENSING & DIAGNOSTIC MODULE (SDM)

SDM monitors vehicle velocity changes to detect frontal crashes which are severe enough to warrant air bag module deployment. When a frontal crash of sufficient force is detected, SDM causes enough current flow through air bag modules to deploy air bags. SDM also maintains a 23 Volt Loop Reserve (23 VLR) energy supply to provide deployment energy for up to 10 minutes after loss of voltage.

Additionally, SDM provides diagnostic monitoring of SIR system electrical components. When a malfunction is detected, SDM sets a Diagnostic Trouble Code (DTC) which can be retrieved using a scan tool. SDM warns driver of system malfunctions by controlling AIR BAG warning light.

AIR BAG WARNING LIGHT

Ignition switch applies battery voltage to AIR BAG warning light. SDM controls light by providing ground with a light driver. When ignition switch is first turned ON, AIR BAG warning light verifies system operation by flashing 7 times and turning off. During vehicle operation, AIR BAG warning light warns driver of malfunctions which could potentially affect SIR system operation.

FRONT-END DISCRIMINATING SENSOR

Front-end discriminating sensor is an auxiliary sensor which assists SDM in determining when deployment should occur by providing an input signal. Although front-end discriminating sensor is a mechanical sensor, it is not part of deployment loop.

SIR COIL ASSEMBLY

SIR coil assembly consists of 2 or more current-carrying coils. Coils are attached to steering column and allow rotation of steering wheel, while maintaining continuous (directly wired) contact of deployment loop through driver-side air bag module.

AIR BAG MODULES

Air bag modules consist of an inflatable bag and an inflator. When vehicle is in an accident of sufficient force, SDM causes current flow through deployment loops. Current passing through inflators ignites inflator charges, producing gas which rapidly inflates air bags.

KNEE BOLSTERS

Knee bolsters are used to absorb energy and control forward movement of front passengers. This is accomplished by limiting leg movement during a frontal crash.

COMPONENT LOCATIONS

ComponentLocation
Air bag warning lightInstrument cluster
Driver air bag moduleOn steering wheel
Front end discriminating sensorHood latch bracket
Knee bolstersLower instrument panel
Passenger air bag modulePassenger-side instrument panel
Sensing & DiagnosticModule (SDM)Under right front seat
SIR coilWithin steering column

COMPONENT LOCATIONS

SYSTEM OPERATION CHECK

If system is functioning normally, AIR BAG warning light flashes 7 times and then turns off when ignition switch is turned ON. System malfunction is indicated when light does not illuminate at all, light comes on while vehicle is driven, light flashes 7 times and remains on, or light does not flash but remains on when ignition switch is turned on.

SIR system faults are usually due to a disconnected or loose electrical connector caused by previous service on vehicle. Always check SIR coil connector at base of steering column for loose or damaged wiring.

AIR BAG SAFETY PRECAUTIONS

Observe the following precautions when working with SIR system

  1. SDM maintains sufficient voltage to cause air bag deployment for up to 10 minutes after ignition switch is turned OFF, battery is disconnected, or fuse powering SDM is removed. In order to begin servicing immediately, inflator modules must be removed from deployment loop. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) .
  2. After repairs, ensure AIR BAG warning light is working properly and no system faults are indicated. See «SYSTEM OPERATION CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .
  3. Always wear safety glasses when servicing or handling an air bag module.
  4. Air bag modules must be stored in original special containers until used for service. Store in a clean, dry place, away from sources of extreme heat, sparks, or high electrical energy.
  5. Air bag modules or SDMs should not be subjected to temperatures greater than 150 F (65 C).
  6. Air bag modules or SDMs should not be used if they have been dropped from a height of 3 feet or greater.
  7. When placing a live air bag module on a bench or other surface, always make certain that trim cover faces up. This will reduce motion of module if accidentally deployed.
  8. After deployment, air bag surface may contain deposits of sodium hydroxide, which can irritate skin. Always wear safety glasses, rubber gloves and long-sleeved shirt during clean-up, and wash hands using mild soap and water. Follow correct disposal procedures. See «DISPOSAL PROCEDURES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disposal-procedures) .
  9. At no time should any electrical source be allowed near inflator on back of air bag module.
  10. DO NOT apply power to SIR system unless all components are connected or a diagnostic chart requests it, as this will set a diagnostic trouble code.
  11. When carrying a live air bag module, trim cover should be pointed away from body to minimize injury in case of accidental deployment.
  12. DO NOT attempt to service any SIR component. All defective SIR components must be replaced.
  13. DO NOT probe a wire through insulator; this damages wire and eventually causes failure due to corrosion.
  14. When performing electrical tests, prevent accidental shorting of terminals. Such mistakes can damage fuses or components and may cause a second fault code to set, making diagnosis of original problem more difficult.
  15. When using diagnostic charts to diagnose SIR system, under no circumstances should a volt-ohmmeter, test light or any type of electrical equipment not specified by manufacturer be used. See «SPECIAL TOOLS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) .
  16. If SIR system is not fully functional for any reason, vehicle should not be driven until system is repaired. DO NOT remove bulbs, modules, sensors or other components or in any way disable system from operating normally.

SPECIAL TOOLS

To avoid accidental deployment when working on SIR system, use only electrical test equipment specified by manufacturer. See RECOMMENDED TOOLS table.

Tool NameTool Number
Connector test adapter kitJ-35616-A
Digital multimeterJ-39200
Scan toolTech 2
SIR deployment fixtureJ-39401-B
SIR deployment harnessJ-38826
SIR driver-passenger load toolJ-38715-A
SIR shorting barJ-42113
Steering wheel pullerJ-1859-03
Terminal repair kitJ-38125-A

RECOMMENDED TOOLS

CENTERING COIL ASSEMBLY

  1. If coil assembly has been removed from steering column and is being reinstalled, go to next step. New coil assemblies are pre-centered and include a centering tab that is removed once coil is installed.
  2. Hold coil assembly with clear bottom upward to see coil bottom. While holding coil assembly housing, depress spring lock and rotate hub in direction of arrow until it stops. Coil ribbon should now be wound up snugly against center hub. Rotate coil hub in opposite direction approximately 2 3-4 turns. Release spring lock between locking tabs. (Scheme 41)

Scheme 41

Scheme 41
Scheme 41

DISABLING & ACTIVATING AIR BAG SYSTEM

CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See Computer Relearn Procedures in the Reference Information section. Record preset radio stations and obtain code for theft deterrent-equipped radios before disconnecting battery.

DISABLING SYSTEM

WARNINGSDM maintains sufficient voltage to cause air bag deployment for up to 10 minutes after ignition switch is turned OFF, battery is disconnected, or fuse powering SDM is removed. In order to begin servicing immediately, inflator modules must be removed from deployment loop.

Note. When SIR fuse is removed and ignition switch is in RUN position, AIR BAG warning light will be on. This does not indicate a system malfunction.

  1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition switch OFF and remove key.
  2. Remove SIR fuse (15-amp) from instrument panel fuse block. Remove driver-side sound insulator panel. Remove Connector Position Assurance (CPA) clips and disconnect Yellow 2-pin connectors for driver and passenger-side air bag modules located at base of steering column. (Scheme 42)

Scheme 42

Scheme 42
Scheme 42

ACTIVATING SYSTEM

Remove key from ignition switch. Connect driver and passenger-side air bag Yellow 2-pin connectors at base of steering column. (Scheme 42) Install CPA clips. Reinstall driver-side sound insulator panel and SIR fuse. Check system for proper operation. See SYSTEM OPERATION CHECK.

DISPOSAL PROCEDURES

WARNINGTo prevent accidental deployment and personal injury, deploy air bags before disposal. DO NOT dispose of undeployed air bag modules at normal refuse locations. Undeployed air bag modules contain substances that can cause severe illness or personal injury if sealed container is damaged during disposal.

Note. If vehicle is to be scrapped, perform on-vehicle air bag deployment procedure.

ON-VEHICLE DEPLOYMENT

  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Turn ignition switch OFF, remove key and put on safety glasses. Disconnect driver and passenger-side air bag Yellow 2-pin connectors at base of steering column. (Scheme 42) Cut air bag module harness connector from vehicle leaving at least 6" of wire at connector.
  2. Strip 1-2" (13 mm) of insulation from each connector wire lead. Cut 2 15-foot deployment wires from 18-gauge multi-strand wire. Strip 1-2" (13 mm) of insulation from both ends of wires. Twist wires together at one end to short.
  3. Twist together one connector wire lead to other end of each deployment wire. (Scheme 43) Bend twisted connection flat and wrap tightly with electrical tape to insulate. Repeat this step for other connector wire lead.
  4. Remove all loose objects from front seat, and ensure no one is in vehicle. Connect deployment harness to air bag module connector. Stretch wires away from car as far as possible.
  5. Repeat steps 1) through 4) for other Yellow 2-pin connector. Cover windshield and front door openings with a drop cloth.
  6. Separate wire ends. Connect wires to a 12-volt battery. Air bag should deploy. Disconnect wires from battery. DO NOT touch metal surfaces of air bag module for at least 10 minutes due to heat generated during deployment. Wear gloves and safety glasses when handling deployed air bag module. Wash hands with mild soap and water. Dispose of deployed air bag module like any other part. Repeat deployment procedure for passenger-side air bag.
  7. If air bag modules do not deploy, carefully remove from vehicle. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Temporarily store module with trim facing up. Contact manufacturer for proper disposal instructions.

Scheme 43

Scheme 43
Scheme 43

OFF-VEHICLE DEPLOYMENT

  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Turn ignition switch OFF, remove key and put on safety glasses. Short 2 SIR Deployment Harness (J-38826) leads together by fully seating one banana plug into the other. Connect appropriate pigtail adapter to SIR deployment harness. (Scheme 44)
  2. Remove driver and passenger-side air bag modules. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.
  3. Secure air bag module on ground (preferably outdoors) in SIR Deployment Fixture (J-39401-B) at least 6 feet away from any people or objects. Stretch SIR deployment harness and pigtail adapter from air bag module to its full length. Place a 12-volt battery near shorted end of SIR deployment harness.
  4. Connect air bag module to pigtail adapter on SIR deployment harness. (Scheme 44) Ensure area around air bag module is clear of people or loose objects. Verify that air bag module is resting with trim cover facing up.
  5. Separate 2 banana plugs on SIR deployment harness. Connect SIR deployment harness wires to battery. (Scheme 44) Air bag module should deploy immediately. If air bag module does not deploy, go to next step. Disconnect SIR deployment harness from battery. Short 2 SIR deployment harness leads together. DO NOT touch metal surfaces of air bag module for at least 10 minutes due to heat generated during deployment. Wear gloves and safety glasses when handling deployed air bag module. Wash hands with mild soap and water after handling. Dispose of deployed air bag module like any other part. Inspect pigtail adapter and SIR deployment harness for damage after each use. Repeat deployment procedure for passenger-side air bag module.
  6. Ensure that SIR deployment harness is disconnected from battery and that 2 banana plugs have been shorted together. Disconnect pigtail adapter from air bag module. Temporarily store air bag module with trim cover facing up. Contact manufacturer for proper disposal instructions.

Scheme 44

Scheme 44
Scheme 44

POST-COLLISION INSPECTION

See Air Bag-SRS Component Inspection & Replacement Tables in Reference Information section.

REMOVAL & INSTALLATION

WARNINGFailure to follow service precautions may result in air bag deployment and personal injury. See AIR BAG SAFETY PRECAUTIONS . After component replacement, check system operation. See SYSTEM OPERATION CHECK .

Removal

  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
  2. Remove right-front seat and carpet retainer. Roll back carpet and insulation to access SDM. Remove Connector Position Assurance (CPA) clip and disconnect SDM connector. (Scheme 45) Remove SDM mounting bolts and remove SDM.

Installation

  1. Mount SDM on vehicle, ensuring arrow is pointing toward front of vehicle. Install SDM bolts and tighten to 10 ft. lbs. (14 N.m). Connect SDM connector and ensure CPA clip is installed.
  2. Position insulation and carpet over SDM. Reinstall right-front seat and carpet retainer. Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «SYSTEM OPERATION CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

Scheme 45

Scheme 45
Scheme 45
  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
  2. Forward discriminating sensor is located next to hood latch bracket. Remove CPA clip and disconnect sensor connector. Remove sensor mounting fasteners. Remove sensor. (Scheme 46)
  1. Align sensor to vehicle, ensuring arrow on sensor body is pointing toward front of vehicle. Install fasteners and tighten to 89 INCH lbs. (10 N.m). Reconnect sensor connector and reinstall CPA clip.
  2. Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «SYSTEM OPERATION CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

Scheme 46

Scheme 46
Scheme 46
  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions) . Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) .
  2. Remove driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) . Remove steering wheel nut. Note mark on steering shaft and steering wheel to ensure proper alignment during installation. Remove steering wheel using Steering Wheel Puller (J-1859-03).
  1. To install, reverse removal procedure. Route wiring through steering wheel. Align mark on steering wheel with mark on shaft, then install nut. Tighten nut to 27 ft. lbs. (37 N.m). Install driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) .
  2. Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «SYSTEM OPERATION CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

Note. Coil assembly will become uncentered if column is separated from steering gear and allowed to rotate, or if centering spring is depressed, allowing hub to rotate while coil assembly is removed from column.

  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
  2. Ensure front wheels face straight ahead. Remove driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system). Remove steering wheel. See «STEERING WHEEL»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system).Remove upper and lower steering column covers.
  3. Remove wiring harness straps from steering column wiring harness. Remove all retaining rings. Remove SIR coil from steering shaft. (Scheme 47)To install, reverse removal procedure.

Scheme 47

Scheme 47
Scheme 47

Removal Driver-side

  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
  2. Remove air bag mounting screws from back of steering wheel. (Scheme 48) Disconnect horn ground lead. Remove CPA clip and disconnect driver-side air bag module connector. Remove air bag module.
  1. Connect air bag connector and install CPA clip. Connect horn lead. Install air bag module to steering wheel, ensuring no wires are pinched. Install air bag module mounting screws through back of steering wheel and tighten to 89 INCH lbs. (10 N.m).
  2. Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «SYSTEM OPERATION CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

Scheme 48

Scheme 48
Scheme 48

Removal Passenger-side

  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
  2. Remove instrument panel trim pad. See «INSTRUMENT PANEL TRIM PAD»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system). Remove CPA clip and disconnect passenger-side air bag module connector. Remove air bag module fasteners. Remove passenger-side air bag module. (Scheme 49)
  1. Install air bag module. Install fasteners and tighten to 31 INCH lbs. (3.5 N.m). Connect air bag connector and reinstall CPA clip. Install instrument panel trim pad. See «INSTRUMENT PANEL TRIM PAD»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) .
  2. Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «SYSTEM OPERATION CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

Scheme 49

Scheme 49
Scheme 49

Removal & Installation Cavalier

  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
  2. Remove defroster grille. Remove left and right instrument panel end caps. Open glove box. Remove glove box trim plate and accessory trim plate.
  3. Remove screws from bracket in upper left corner of glove box. Remove accessory trim plate. Remove hex head screws from instrument panel trim pad. (Scheme 50) Remove trim pad from vehicle. To install, reverse removal procedure. Tighten trim pad screws to 18 INCH lbs. (2 N.m).

Scheme 50

Scheme 50
Scheme 50

Removal & Installation (Sunfire)

  1. Before proceeding, See «AIR BAG SAFETY PRECAUTIONS»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
  2. Remove defroster grille. Remove left and right instrument panel end caps. Remove screws located under both end caps. Open glove box. Remove screws from glove box trim plate and accessory trim plate.
  3. Remove screws from bracket located in upper left corner of glove box. Remove upper trim panel. Remove upper pad trim. Remove instrument panel trim pad screws and remove trim pad from instrument panel. (Scheme 51) To install, reverse removal procedure. Tighten trim pad screws to 18 INCH lbs. (2 N.m).

Scheme 51

Scheme 51
Scheme 51

DIAGNOSTICS

WARNINGFailure to follow service precautions may result in air bag deployment and personal injury. See AIR BAG SAFETY PRECAUTIONS . After component replacement, check system operation. See SYSTEM OPERATION CHECK .

DIAGNOSTIC TROUBLE CODES (DTCS)

Sensing & Diagnostic Module (SDM) provides a record of DTCs, stored according to type. SDM performs diagnostic monitoring of SIR system electrical components and sets a diagnostic trouble code (DTC) when a malfunction is detected. Current DTCs are stored in SDM and are erased when fault is corrected. Current DTCs can be read using a scan tool such as Tech 2.

SCAN TOOL DIAGNOSTICS

Scan Tool (Tech 2) reads and clears current and history codes. Ensure scan tool contains correct software cartridge for SIR diagnostics. To use scan tool, connect it to DLC connector, and turn ignition switch to RUN position. Follow scan tool manufacturer instructions for communication with SIR system. Scan tester reads serial data from SDM data link output terminal No. 5 to DLC connector terminal No. 9.

DIAGNOSTIC PROCEDURES

Diagnostic procedures are designed to find and repair SIR malfunctions. It is important to use diagnostic charts and follow sequence listed below

Perform SIR System Diagnostic Check

SIR System Diagnostic Check should always be starting point for any SIR diagnostics. It checks for proper AIR BAG warning light operation and SIR trouble codes using both flash code and scan tool methods.

Refer To Proper Diagnostic Chart

SIR Diagnostic System Check indicates correct chart to diagnose SIR problems. Bypassing procedures may result in extended diagnostic time, incorrect diagnosis and incorrect parts replacement.

Repeat SIR Diagnostic System Check

Performing SIR Diagnostic System Check after all repair or diagnostic procedures ensures that repair has been made correctly and that no other conditions exist.

DIAGNOSTIC TESTS

Trouble CodePossible Cause
B0016Passenger deployment loop resistance low
B0017Passenger deployment loop open
B0018Passenger deployment loop short to ground- voltage out of range
B0022Driver deployment loop resistance low
B0024Driver deployment loop short to ground- voltage out of range
B0026Driver deployment loop open
B0035Discriminating sensor circuit closed or short to ground
B0036Discriminating sensor circuit open- missing-short to voltage
B0051Deployment commanded
B0053Deployment commanded with loop malfunction
B1001Option configuration error

DIAGNOSTIC TROUBLE CODE (DTC) CHART

CONNECTOR IDENTIFICATION

Note. Refer to illustrations to identify SIR connector terminals. (Scheme 52), (Scheme 56), (Scheme 53), (Scheme 54) & (Scheme 55).

Scheme 52

Scheme 52: CONNECTOR IDENTIFICATION
Scheme 52: CONNECTOR IDENTIFICATION

Scheme 53

Scheme 53
Scheme 53

Scheme 54

Scheme 54
Scheme 54

Scheme 55

Scheme 55
Scheme 55

Scheme 56

Scheme 56
Scheme 56

SIR DIAGNOSTIC SYSTEM CHECK

WARNINGTo avoid air bag deployment and injury when trouble shooting system, only use test equipment specified in diagnostic charts. Carefully follow all instructions.

Circuit Description

Ignition switch supplies IGNITION POSITIVE VOLTAGE to SDM at terminal No. A1 using SIR fuse. When ignition switch is turned to RUN position, SDM responds by flashing AIR BAG warning light 7 times, then turning off while performing tests on SIR system.

Diagnostic Aids

When an intermittent concern is indicated by a customer symptom that cannot be duplicated or by a DTC that is retrieved as a history code without a corresponding current DTC, an intermittent condition may exist. Intermittent problems are usually caused by circuit or connector concerns.

Diagnostic Procedure

  1. Observe AIR BAG warning light while turning ignition switch to RUN position. If AIR BAG warning light flashes 7 times and goes off, go to next step. If AIR BAG warning light does not function as described, go to «AIR BAG WARNING LIGHT CIRCUIT MALFUNCTION»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system).
  2. Turn ignition on. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, inspect Data Link Connector (DLC) and circuits. Scan tool should receive battery power at terminal No. 16 with a ground connection at terminal No. 4. Class 2 serial data signal should be received at terminal No. 2 and be grounded at terminal No. 5. (Scheme 56) When scan tool powers up, go to next step.
  3. Using scan tool, establish communication with SDM. If scan tool communicates with SDM, go to next step. If scan tool does not communicate with SDM, go to «SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system).
  4. Using scan tool, request SIR DTC display. If scan tool displays DTCs go to next step. If scan tool does not display any DTCs, system is functioning normally.
  5. If DTCs begin with "U", go to «SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system). If scan tool displays DTCs that do not begin with "U", go to next step.
  6. If scan tool displays DTC B1000, check for ECU malfunction in Body Control System. If scan tool displays other DTCs, refer to DIAGNOSTIC TROUBLE CODE (DTC) CHART table.

When ignition switch is turned to RUN position, SIR fuse applies battery voltage to SDM at terminal No. A1. Ignition switch supplies voltage to instrument cluster. When ignition switch is turned to RUN position, AIR BAG warning light flashes 7 times and goes off.

If battery voltage is outside normal operating range of 9-16 volts, AIR BAG warning light will come ON steady with no DTCs set.

A loss of serial data communication between SDM and instrument cluster will cause AIR BAG warning light to turn on.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  2. If Instrument Cluster Diagnostic Check has been performed, go to next step. If Instrument Cluster Diagnostic Check has not been performed, go to «INSTRUMENT CLUSTER DIAGNOSTIC CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system).
  3. Turn ignition off. Check AIR BAG warning light for correct operation. See «SYSTEM OPERATION CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check). If AIR BAG warning light flashes 7 times, go to step 5. If AIR BAG warning light does not flash 7 times, go to next step.
  4. Replace instrument cluster. Go to step 18.
  5. Connect scan tool to DLC. Ensure communication between scan tool and instrument cluster exists. Using scan tool, retrieve instrument cluster DTC display list. If DTC U1088 does not exist, go to next step. If DTC U1088 exists, a malfunction exists in data link communications circuit. Inspect and repair data link communications circuit.
  6. Using scan tool, retrieve instrument cluster DTC display list. If AIR BAG warning light is being commanded on, go to next step. If AIR BAG warning light is not being commanded on, go to step 4.
  7. Using scan tool, retrieve SIR DTC display list. If ignition voltage displayed on scan tool is more than 9 volts, go to next step. If ignition voltage displayed on scan tool is less than 9 volts, go to step 9.
  8. If ignition voltage is more than 16 volts, repair charging system. If ignition voltage is 16 volts or less, go to step 17.
  9. Turn ignition off. Disconnect SDM connector. Check SDM connector terminals for corrosion, damage or poor connections. If no damage is found, go to step 11. If damage is found, go to next step.
  10. Replace SDM connector. Go to step 18.
  11. Remove SIR fuse. Using Digital Multimeter (J-39200), measure resistance between SIR fuse holder terminal and SDM harness connector terminal No. A1. (Scheme 52) If resistance is less than 2 ohms, go to step 13. If resistance is 2 ohms or greater, go to next step.
  12. Repair open or high resistance in circuit 1139. Go to step 18.
  13. Turn ignition on. Using Digital Multimeter (J-39200), measure voltage between input side of SIR fuse and ground. If voltage is near 12 volts, go to step 15. If voltage is not near 12 volts, go to next step.
  14. Repair open or high resistance in power feed circuit to AIR BAG fuse. Go to step 18.
  15. Using Digital Multimeter (J-39200), measure resistance between SDM case and ground. If resistance is less than 2 ohms, go to step 17. If resistance is 2 ohms or greater, go to next step.
  16. Repair open or high resistance condition between SDM case and ground.
  17. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  18. Reconnect all SIR system components. Ensure that all components are properly mounted. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  1. Turn ignition on. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, inspect Data Link Connector (DLC) and circuits. Scan tool should receive battery power at terminal No. 16 with a ground connection at terminal No. 4. Class 2 serial data signal should be received at terminal No. 2 and be grounded at terminal No. 5. (Scheme 56)When scan tool power up is established, go to next step.
  2. Turn ignition on. Using scan tool, establish communication with Instrument Panel Cluster (IPC). If scan tool communicates with IPC, go to next step. If scan tool does not communicate with IPC, go to «SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system).
  3. Using scan tool, request IPC DTC display. If IPC DTCs are displayed, go to next step. If no IPC DTCs are displayed, diagnose instrument cluster.
  4. If any DTCs are displayed which begin with "U", go to «SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system). If no DTCs are displayed which begin with "U", go to next step.
  5. If scan tool displays DTC B1001, go to DIAGNOSTIC TROUBLE CODES (DTC) CHART table. If DTC B1001 is not displayed, diagnose instrument cluster.

Modules connected to class 2 serial data circuit monitor serial data communications during normal vehicle operations. Connecting scan tool to DLC allows communication with SDM as well as other control modules for diagnostic testing.

Engine will not start when there is a total malfunction of class 2 serial data circuit.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, inspect Data Link Connector (DLC) circuits. Scan tool should receive battery power at terminal No. 16, and ground connection at terminal No. 4. Class 2 serial data signal should be received at terminal No. 2, and grounded at terminal No. 5. (Scheme 56) When scan tool powers up, go to next step.
  2. Turn ignition on. Using scan tool, attempt to communicate with each module on class 2 serial data circuit. If scan tool communicates with any module on circuit, go to next step. If scan tool does not communicate with any module, go to step 6.
  3. Select DISPLAY DTC function for each module. If any DTCs beginning with "U" in the number range of 1000-1255 are displayed, go to next step. If no DTCs beginning with "U" are displayed, go to step 5.
  4. If DTC U1000 is the only DTC displayed, go to «CLASS 2 COMMUNICATION MALFUNCTION»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system). If DTC U1000 is not the only DTC displayed, diagnose loss of class 2 serial data communication between modules.
  5. Diagnose communication malfunction for modules which are not communicating. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  6. Turn ignition off. Disconnect scan tool from Data Link Connector (DLC). Inspect DLC terminals No. 2 and 5 for poor connections. Repair connector and establish communication with control modules. If no connector problems are found, go to next step.
  7. Measure resistance between DLC terminal No. 5 and ground. If open circuit is found, repair circuit and establish communication with control module. If no open is detected, go to next step.
  8. Test Class 2 serial data circuit for an open circuit between DLC terminal No. 2 and terminal No. B7 (Purple wire) of connector C2 of BCM. If an open is found, repair circuit and establish communication with control module.
  9. Disconnect (Powertrain Control Module) PCM connector C1. Disconnect radio connector C1 (base) or C2 (Monsoon). Disconnect instrument cluster connector. Install scan tool. Turn ignition on. Using scan tool, communicate with BCM through class 2 serial data circuit. If scan tool communicates with (Body Control Module) BCM on class 2 serial data circuit, go to next step. If scan tool does not communicate with BCM, go to step 11.
  10. Turn ignition off. Disconnect Electronic Brake Control Module (EBCM) connector C1. Reconnect PCM connector C1. Turn ignition on. Using scan tool, communicate with BCM or PCM through class 2 serial data circuit. If communication was established, go to step 12. If communication was not established, go to step 13.
  11. Turn ignition off. Test class 2 serial data circuit for a short to ground or voltage between BCM and DLC, BCM and PCM, BCM and Instrument Panel Cluster (IPC), BCM and RADIO. (Turn ignition on when testing for short to voltage). If a short condition was found, correct condition and establish communication with control module. If short condition was not found, go to step 16.
  12. Turn ignition off. Disconnect SDM connector. Reconnect IPC connector. Turn ignition on. Attempt to communicate with BCM, PCM or IPC through class 2 serial data circuit. If communication is established with any module, go to step 14. If communication is not established with any module, go to step 15.
  13. Turn ignition off. Test class 2 serial data circuit between PCM and EBCM for a short to ground or voltage. (Turn ignition on when checking for voltage). If short is found, correct condition and establish communication with control module. If short is not found, go to step 17.
  14. Turn ignition off. Connect SDM connector. Turn ignition on. Attempt communication with BCM, PCM, IPC or SDM on class 2 serial data circuit. If communication is established, go to step 21. If communication is not established, go to step 19.
  15. Turn ignition off. Test class 2 serial data circuit between IPC and SDM for short to ground or short to voltage. If short was found and corrected, establish communication with control module. If no short is found, go to step 18.
  16. Inspect for poor connections at BCM harness connector. If connection problems are found, repair connections. Establish communication with control module. If no connection problems are found, go to step 24.
  17. Inspect for poor connections at PCM harness connector. If connection problems are found, repair connections. Establish communication with control module. If no connection problems are found, go to step 25.
  18. Inspect for poor connections at IPC harness connector. If connection problems are found, repair connections. Establish communication with control module. If no connection problems are found, go to step 26.
  19. Turn ignition off. Test class 2 serial data circuit between SDM and EBCM for a short to ground or voltage. (Turn ignition on when checking for short to voltage). If short was found and corrected, establish communication with control module. If no short was found, go to next step.
  20. Inspect for poor connections at SDM harness connector. If poor connections were found, correct condition and establish communication with control module. If connections were okay, go to step 27.
  21. Turn ignition off. Reconnect EBCM connector. Turn ignition on. Attempt to communicate with BCM, PCM, IPC, EBCM or SDM through class 2 serial data circuit. If communication is established, go to next step. If communication is not established, go to step 23.
  22. Inspect for poor connections at radio harness connector. If poor connections are found, correct condition and establish communication with control module. If connections were okay, go to step 29.
  23. Inspect for poor connections at EBCM connector. If poor connections are found, correct condition and establish communication with control modules. If connections were okay, go to step 30.
  24. Replace Body Control Module (BCM). Go to step 31.
  25. Replace Powertrain Control Module (PCM). Go to step 31.
  26. Replace Instrument Panel Cluster (IPC). Go to step 31.
  27. Replace Sensing & Diagnostic Module (SDM). See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 31.
  28. Replace radio. Go to step 31.
  29. Replace EBCM. Go to step 31.
  30. Reconnect all disconnected electrical connectors. Install scan tool. Turn ignition on. Wait 10 seconds. Select DISPLAY DTC function for each module. Record all displayed DTC and DTC status. If any DTCs were recorded with both a current and a "U" status, go to step 33. If any DTCs were recorded that did not have a current and a "U" status, go to next step).
  31. If any DTCs were recorded that began with "U", go to next step. If no DTCs were recorded that began with "U", go to step 33.
  32. Diagnose DTCs for each module or malfunction indicated. If vehicle will start and run, repair is complete.
  33. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).

Modules connected to class 2 serial data circuit monitor serial data communications during normal vehicle operations. Operating information and commands are exchanged among all modules connected to serial data circuit. When a module receives a message for a critical operating parameter, the module records the ID number of sending module. When a module does not associate an ID number with at least one critical parameter within 5 seconds of beginning serial data communication, DTC U1000 is set.

Conditions For Setting DTC

DTC sets when serial data communication error has occurred. At least one critical operating parameter has not been associated with an ID number within about 7 seconds after beginning serial data communication.

Action Taken

SDM turns on AIR BAG warning light and sets DTC.

Conditions For Clearing DTC

A current DTC U1000 will clear when all critical operating parameters have been associated with an ID number, or at end of current ignition cycle. A history DTC U1000 will clear when a CLEAR CODES command is issued via scan tool.

When a malfunction, such as a blown fuse to a module, occurs while modules are communicating, the current DTC is cleared but the history DTC remains. When modules begin to communicate again, the module with the malfunction will not be identified by other modules so DTC U1000 is set current by other modules. The module which is not communicating is the likely cause of problem. Making note of which modules are communicating will help identify which module is not communicating.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If DTCs in the range of U1001-U1199 are recorded with a history status, diagnose applicable module. If DTCs in range of U1001-U1199 are not recorded with a history status, go to next step.
  2. Turn ignition on. Using scan tool, communicate with each module on class 2 serial data circuit. If any modules are not communicating, go to next step. If all modules are communicating, go to step 11 .
  3. Test voltage feed circuit to any module which is not communicating for an open or short to ground. If an open or short to ground is found, repair condition and go to step 9 . If no open or short is found, go to next step.
  4. Turn ignition off. Test ground circuit of module which is not communicating for open circuit. If open circuit is found, repair condition and go to step 9 . If no open circuit is found, go to next step.
  5. Inspect for poor connections at battery voltage circuit, ground circuit and class 2 serial data circuit of module that is not communicating. If problem is found, correct condition and go to step 7 . If no problem is found, go to next step.
  6. Replace module that is not communicating. Go to step 9 .
  7. Connect scan tool to DLC. Turn ignition on. Select DISPLAY DTC function for module that was not communicating. If scan tool displays any DTCs that begin with "U", perform diagnostic check for that module. If no DTCs beginning with "U" are displayed, go to next step.
  8. Using scan tool, clear DTCs. Go to next step.
  9. Using scan tool, select DISPLAY DTC function for module which had DTC U1000 set as a current DTC. If scan tool displays any DTCs which do not begin with "U", perform diagnostic check for that particular module. If no DTCs beginning with "U" were displayed, go to step 10 .
  10. Using scan tool, clear DTCs. System is okay.
  11. If any current DTCs for module which had DTC U1000 were recorded, perform diagnostic check for module. If no current DTCs were recorded, go to next step.
  12. Install scan tool. Turn ignition on. Use scan tool to clear DTCs. Turn ignition off. Wait at least 5 seconds. Turn ignition on. Select DISPLAY DTC function on scan tool. If DTC U1000 is displayed as a current DTC, go to step 13 . If DTC U1000 is not displayed as a current DTC, see DIAGNOSTIC AIDS.
  13. Replace module which had DTC U1000 set as current DTC. System is okay. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check) .

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM then performs continuous diagnostic tests on deployment loops. If voltage out of range test detects a malfunction, SDM will not run deployment loop resistance test.

DTC sets when passenger deployment loop voltage and resistance tests are not within a specified range.

DTC will set if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Passenger frontal deployment loop is not open.
  3. Passenger frontal deployment loop is not shorted to voltage.
  4. Passenger frontal deployment loop is not shorted to ground.
  5. Passenger frontal deployment loop resistance is less than 1.3 ohms for 300 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

DTC clears when CLEAR CODES command is issued via scan

tool. History DTC will clear once 255 malfunction free ignition cycles have occurred.

An intermittent condition is likely to be caused by a short between circuit 1403 and 1404, or by a malfunctioning shorting bar on passenger-side air bag connector.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  2. Turn ignition off. Disconnect passenger-side air bag Yellow 2-pin connector. Inspect male and female sides of connector for corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 4.
  3. If male side of connector is damaged, replace passenger-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. If female side of connector is damaged, replace connector. Go to step 10.
  4. Reconnect passenger-side air bag Yellow 2-pin connector. Ensure that Connector Position Assurance (CPA) clip is installed correctly. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0016, go to next step. If scan tool does not indicate DTC B0016, go to DIAGNOSTIC AIDS.
  5. Turn ignition off. Disconnect passenger-side air bag Yellow 2-pin connector. Install SIR Driver-Passenger Load Tool (J-38715-A) to female side of harness connector. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0016, go to step 7. If scan tool does not indicate DTC B0016, go to next step.
  6. Turn ignition off. Replace passenger-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 10.
  7. Turn ignition off. Remove SIR Driver-Passenger Load Tool (J-38715-A) from female side of harness connector. Disconnect SDM harness connector. Using Digital Multimeter (J-39200), measure resistance between terminals No. A3 and A8 at SDM connector. (Scheme 52) If resistance is infinite, go to next step. If resistance is not infinite, go to step 9.
  8. Repair short between circuits 1403 and 1404. Go to step 10.
  9. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  10. Reconnect all SIR components. Ensure that all components are properly mounted. Turn ignition on. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM then performs continuous diagnostic tests on deployment loops. If voltage out of range test detects a malfunction, SDM will not run deployment loop resistance test.

DTC sets when passenger deployment loop voltage and resistance tests are not within a specified range.

DTC will set during voltage out of range test if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Passenger frontal deployment loop is not shorted to voltage.
  3. Voltage at SDM terminal No. A3 is less than 2 volts.
  4. Passenger frontal deployment loop resistance is at least 6 ohms for 300 milliseconds.

DTC will set during resistance test if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Passenger frontal deployment loop is not shorted to voltage.
  3. Passenger frontal deployment loop is not shorted to ground.
  4. Passenger frontal deployment loop resistance is more than 3.7 ohms for 300 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

DTC clears when CLEAR CODES command is issued via scan tool. History DTC clears once 255 malfunction free ignition cycles have occurred.

An intermittent condition is likely to be caused by a poor connection at passenger-side air bag connector terminals "A" or "B", SDM terminals No. A3 or A8, or by an open in circuits 1403 or 1404.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  2. Turn ignition off. Disconnect passenger-side air bag Yellow 2-pin connector. Inspect male and female sides of connector for corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 4.
  3. If male side of connector is damaged, replace passenger-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. If female side of connector is damaged, replace connector. Go to step 14.
  4. Reconnect passenger-side air bag Yellow 2-pin connector. Ensure that Connector Position Assurance (CPA) clip is installed correctly. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0017, go to next step. If scan tool does not indicate DTC B0017, go to DIAGNOSTIC AIDS.
  5. Turn ignition off. Disconnect passenger-side air bag Yellow 2-pin connector. Install SIR Driver-Passenger Load Tool (J-38715-A) to female side of harness connector. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0017, go to step 7. If scan tool does not indicate DTC B0017, go to next step.
  6. Turn ignition off. Replace passenger-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 14.
  7. Turn ignition off. Remove SIR Driver-Passenger Load Tool (J-38715-A) from female side of harness connector. Disconnect SDM harness connector. Inspect connector for corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 9.
  8. Replace SDM harness connector. Go to step 14.
  9. Using Digital Multimeter (J-39200), measure resistance of circuit 1403 between terminal No. A3 of SDM connector and terminal "A" of passenger air bag connector. (Scheme 52)& (Scheme 55). If resistance is less than 0.5 ohms, go to step 11. If resistance is 0.5 ohms or greater, go to next step.
  10. Repair the open or high resistance condition in circuit 1403. Go to step 14.
  11. Using Digital Multimeter (J-39200), measure resistance of circuit 1404 between terminal No. A8 of SDM connector and terminal "B" of passenger air bag connector. (Scheme 52)& (Scheme 55). If resistance is less than 0.5 ohms, go to step 13. If resistance is 0.5 ohms or greater, go to next step.
  12. Repair the open or high resistance condition in circuit 1404. Go to step 14.
  13. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  14. Reconnect all SIR components. Ensure that all components are properly mounted. Turn ignition on. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM then performs continuous diagnostic tests on deployment loops. If voltage out of range test detects a malfunction, SDM will not run deployment loop resistance test.

DTC sets when passenger deployment loop voltage and resistance tests are not within a specified range.

DTC will set during voltage out of range test if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Passenger frontal deployment loop is not shorted to voltage.
  3. Voltage at SDM terminal No. A3 is more than 6 volts for 300 milliseconds.

DTC will set during resistance test if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Passenger frontal deployment loop is not shorted to voltage.
  3. Voltage at SDM terminal No. A3 is less than 2 volts and frontal deployment loop resistance is less than 6 ohms for 300 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

DTC clears when CLEAR CODES command is issued via scan tool. History DTC clears once 255 malfunction free ignition cycles have occurred.

An intermittent condition is likely to be caused by a short to voltage or ground in circuits 1403 or 1404. Check wiring carefully for cuts or chafing. Damage to passenger-side air bag module pigtail lead will require replacement of passenger-side air bag.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  2. Turn ignition off. Disconnect passenger-side air bag Yellow 2-pin connector. Inspect male and female sides of connector for corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 4.
  3. If male side of connector is damaged, replace passenger-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. If female side of connector is damaged, replace connector. Go to step 14.
  4. Reconnect passenger-side air bag Yellow 2-pin connector. Ensure that Connector Position Assurance (CPA) clip is installed correctly. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0018, go to next step. If scan tool does not indicate DTC B0018, go to DIAGNOSTIC AIDS.
  5. Turn ignition off. Disconnect passenger-side air bag Yellow 2-pin connector. Install SIR Driver-Passenger Load Tool (J-38715-A) to female side of harness connector. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0018, go to step 7. If scan tool does not indicate DTC B0018, go to next step.
  6. Turn ignition off. Replace passenger-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 16.
  7. Turn ignition off. Remove SIR Driver-Passenger Load Tool (J-38715-A) from female side of harness connector. Disconnect SDM harness connector. Using Digital Multimeter (J-39200), measure resistance between SDM harness terminal No. A3 and ground. (Scheme 52) If resistance is less than infinite, go to next step. If resistance is infinite, go to step 9.
  8. Repair short to ground in circuit 1403. Go to step 16.
  9. Using Digital Multimeter (J-39200), measure resistance at SDM harness terminal No. A8 and ground. (Scheme 52) If resistance is less than infinite, go to next step. If resistance is infinite, go to step 11.
  10. Repair short to ground in circuit 1404. Go to step 16.
  11. Turn ignition on. Using Digital Multimeter (J-39200), measure voltage between terminal No. A3 of SDM connector and ground. (Scheme 52) If voltage is less than one volt, go to step 13. If voltage is one volt or more, go to next step.
  12. Repair short to voltage condition in circuit 1403. Go to step 16.
  13. Using Digital Multimeter (J-39200), measure voltage of circuit 1404 between terminal No. A8 of SDM connector and ground. (Scheme 52) If voltage is less than one volt, go to step 15. If voltage is one volt or more, go to next step.
  14. Repair short to voltage condition in circuit 1404. Go to step 16.
  15. Turn ignition off. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  16. Reconnect all SIR components. Ensure that all components are properly mounted. Turn ignition on. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM then performs continuous diagnostic tests on deployment loops. If voltage out of range test detects a malfunction, SDM will not run deployment loop resistance test.

DTC sets when passenger deployment loop voltage and resistance tests are not within a specified range.

DTC will set if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Driver frontal deployment loop is not open.
  3. Driver frontal deployment loop is not shorted to voltage.
  4. Driver frontal deployment loop is not shorted to ground.
  5. Driver frontal deployment loop resistance is less than 1.3 ohms for 300 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

DTC clears when CLEAR CODES command is issued via scan tool. History DTC will clear once 255 malfunction free ignition cycles have occurred.

An intermittent condition is likely to be caused by a short between circuit 347 and 348, or by a malfunctioning shorting bar on driver-side air bag or SIR coil connectors.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  2. Turn ignition off. Disconnect SIR coil Yellow 2-pin connector. Inspect male and female sides of connector for corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 4.
  3. If female side of SIR connector is damaged, replace SIR coil. See «SIR COIL ASSEMBLY»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. If male side of connector is damaged, replace connector. Go to step 12.
  4. Reconnect SIR coil Yellow 2-pin connector. Ensure that Connector Position Assurance (CPA) clip is installed correctly. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0022, go to next step. If scan tool does not indicate DTC B0022, go to DIAGNOSTIC AIDS.
  5. Turn ignition off. Install SIR Driver-Passenger Load Tool (J-38715-A) to female side of SIR coil connector. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0022, go to step 9. If scan tool does not indicate DTC B0022, go to next step.
  6. Turn ignition off. Disconnect SIR Driver-Passenger Load Tool (J-38715-A) from SIR coil connector. Reconnect SIR coil Yellow 2-pin connector. Disconnect driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Install SIR Driver-Passenger Load Tool (J-38715-A) to upper SIR coil connector. Turn ignition on. Using scan tool, request SIR DTC display. If DTC B0022 is indicated, go to step 8. If DTC is not indicated, go to next step.
  7. Turn ignition off. Replace driver-side air bag. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 12.
  8. Turn ignition off. Replace SIR coil. See «SIR COIL ASSEMBLY»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 12.
  9. Turn ignition off. Remove SIR Driver-Passenger Load Tool (J-38715-A). Disconnect SDM harness connector. Using Digital Multimeter (J-39200), measure resistance between terminals No. A6 and A7 at SDM connector. (Scheme 52) If resistance is less than infinite, go to next step. If resistance is infinite, go to step 11.
  10. Repair short between circuit 347 and 348. Go to step 12.
  11. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  12. Reconnect all SIR components. Ensure that all components are properly mounted. Turn ignition on. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM then performs continuous diagnostic tests on deployment loops. If voltage out of range test detects a malfunction, SDM will not run deployment loop resistance test.

DTC sets when driver deployment loop voltage and resistance tests are not within a specified range.

DTC will set during voltage out of range test if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Voltage at SDM terminal No. A6 is more than 6 volts for 300 milliseconds.

DTC will set during resistance test if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Driver frontal deployment loop is not shorted to voltage.
  3. Voltage at SDM terminal No. A6 is less than 2 volts and frontal deployment loop resistance is less than 6 ohms for 300 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

DTC clears when CLEAR CODES command is issued via scan tool. History DTC clears once 255 malfunction free ignition cycles have occurred.

An intermittent condition is likely to be caused by a short to voltage or ground in circuits 347 or 348. Check wiring carefully for cuts or chafing. Damage to SIR coil or driver-side air bag module pigtail leads will require replacement of affected component.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  2. Turn ignition off. Disconnect SIR coil Yellow 2-pin connector. Inspect male and female sides of connector for corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 4.
  3. If female side of SIR coil connector is damaged, replace SIR coil. See «SIR COIL ASSEMBLY»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. If male side of connector is damaged, replace connector. Go to step 18.
  4. Reconnect SIR coil Yellow 2-pin connector. Ensure that Connector Position Assurance (CPA) clip is installed correctly. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0024, go to next step. If scan tool does not indicate DTC B0024, go to DIAGNOSTIC AIDS.
  5. Turn ignition off. Install SIR Driver-Passenger Load Tool (J-38715-A) to female side of SIR coil connector. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0024, go to step 9. If scan tool does not indicate DTC B0024, go to next step.
  6. Turn ignition off. Disconnect SIR Driver-Passenger Load Tool (J-38715-A). Reconnect SIR coil connector. Disconnect driver-side air bag module connector. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Install SIR Driver-Passenger Load Tool (J-38715-A) to upper SIR coil connector. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0024, go to step 8. If scan tool does not indicate DTC B0024, go to next step.
  7. Turn ignition off. Replace driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 18.
  8. Turn ignition off. Replace SIR coil. See «SIR COIL ASSEMBLY»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 18.
  9. Turn ignition off. Remove SIR Driver-Passenger Load Tool (J-38715-A). Disconnect SDM harness connector. Using Digital Multimeter (J-39200), measure resistance at SDM harness terminal No. A6 and ground. (Scheme 52) If resistance is less than infinite, go to next step. If resistance is infinite, go to step 11.
  10. Repair short to ground in circuit 347. Go to step 18.
  11. Turn ignition on. Using Digital Multimeter (J-39200), measure resistance between terminal No. A7 of SDM connector and ground. (Scheme 52) If resistance is less than infinite, go to next step. If resistance is infinite, go to next 13).
  12. Repair short to ground condition in circuit 348. Go to step 18.
  13. Turn ignition on. Using Digital Multimeter (J-39200), measure voltage between terminal No. A6 of SDM connector and ground. (Scheme 52) If voltage is less than one volt, go to step 15. If voltage is one volt or more, go to next step.
  14. Repair short to voltage condition in circuit 347. Go to step 18.
  15. Using Digital Multimeter (J-39200), measure voltage between terminal No. A7 of SDM connector and ground. (Scheme 52) If voltage is less than one volt, go to step 17. If voltage is one volt or more, go to next step.
  16. Repair short to voltage condition in circuit 348. Go to step 18.
  17. Turn ignition off. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  18. Reconnect all SIR components. Ensure that all components are properly mounted. Turn ignition on. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM then performs continuous diagnostic tests on deployment loops. If voltage out of range test detects a malfunction, SDM will not run deployment loop resistance test.

DTC sets when passenger deployment loop voltage and resistance tests are not within a specified range.

DTC will set during voltage out of range test if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Driver frontal deployment loop is not shorted to voltage.
  3. Voltage at SDM terminal No. A6 is less than 2 volts.
  4. Driver frontal deployment loop resistance is at least 6 ohms for 300 milliseconds.

DTC will set during resistance test if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. Driver frontal deployment loop is not shorted to voltage.
  3. Driver frontal deployment loop is not shorted to ground.
  4. Driver frontal deployment loop resistance is more than 4.8 ohms for 300 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

DTC clears when CLEAR CODES command is issued via scan tool. History DTC clears once 255 malfunction free ignition cycles have occurred.

An intermittent condition is likely to be caused by a poor connection at driver-side air bag connector terminals "A" or "B", at SIR coil connectors "A" or "B", at SDM terminals No. A6 or A7, or by an open in circuits 347 or 348.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  2. Turn ignition off. Disconnect SIR coil Yellow 2-pin connector. Inspect male and female sides of connector for corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 4.
  3. If female side of connector is damaged, replace SIR coil. See «SIR COIL ASSEMBLY»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. If male side of connector is damaged, replace connector. Go to step 16.
  4. Reconnect SIR coil Yellow 2-pin connector. Ensure that Connector Position Assurance (CPA) clip is installed correctly. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0024, go to next step. If scan tool does not indicate DTC B0024, go to DIAGNOSTIC AIDS.
  5. Turn ignition off. Disconnect SIR coil Yellow 2-pin connector. Install SIR Driver-Passenger Load Tool (J-38715-A) to female side of harness connector. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0024, go to step 9. If scan tool does not indicate DTC B0024, go to next step.
  6. Turn ignition off. Reconnect SIR coil Yellow 2-pin connector. Disconnect driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Install SIR Driver-Passenger Load Tool (J-38715-A) to upper SIR coil connector. Turn ignition on. Using scan tool, request SIR DTC display. If scan tool indicates DTC B0024, go to step 8. If scan tool does not indicate DTC B0024, go to next step.
  7. Turn ignition off. Replace driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 16.
  8. Turn ignition off. Replace SIR coil. See «SIR COIL ASSEMBLY»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 16.
  9. Turn ignition off. Remove SIR Driver-Passenger Load Tool (J-38715-A) from female side of harness connector. Disconnect SDM harness connector. Inspect connector for corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 11.
  10. Replace SDM harness connector. Go to step 16.
  11. Using Digital Multimeter (J-39200), measure resistance of circuit 347 between terminal No. A6 of SDM connector and terminal "A" of driver-side air bag connector. (Scheme 52)& (Scheme 55). If resistance is less than 0.5 ohms, go to step 13. If resistance is 0.5 ohms or greater, go to next step.
  12. Repair open or high resistance condition in circuit 347. Go to step 16.
  13. Using Digital Multimeter (J-39200), measure resistance of circuit 348 between terminal No. A7 of SDM connector and terminal "B" of driver-side air bag connector. (Scheme 52)& (Scheme 55). If resistance is less than 0.5 ohms, go to step 15. If resistance is 0.5 ohms or greater, go to next step.
  14. Repair open or high resistance condition in circuit 348. Go to step 16.
  15. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  16. Reconnect all SIR components. Ensure that all components are properly mounted. Turn ignition on. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM processes signal from front end discriminating sensor to further support air bag deployment. When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM then performs continuous diagnostic tests on deployment loops. If voltage out of range test detects a malfunction, SDM will not run deployment loop resistance test.

DTC sets when passenger deployment loop voltage and resistance tests are not within a specified range.

DTC will set during voltage out of range test if

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. SDM monitors discriminating sensor loop with ignition on.
  3. Voltage at discriminating sensor is 0.5 volts or less for 300 milliseconds.

SDM disables discriminating sensor input, turns on AIR BAG warning light and sets DTC.

DTC clears when voltage at discriminating sensor signal input is greater than 0.5 volts for 300 milliseconds. DTC will also clear when CLEAR CODES command is issued via scan tool. History DTC clears when 255 malfunction-free ignition cycles have occurred.

An intermittent condition is likely to be caused by a short to ground condition in discriminating sensor circuit. Inspect wiring in circuit 1834 and 1751 carefully for cutting or chafing.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  2. Turn ignition off. Disconnect front-end discriminating sensor. Inspect discriminating sensor and harness connector for signs of corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 4.
  3. Replace discriminating sensor. See «FRONT-END DISCRIMINATING SENSOR»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 12.
  4. Using Digital Multimeter (J-39200), measure resistance between front end discriminating sensor terminals. (Scheme 53) If resistance is more than 9000 ohms, go to next step. If resistance is 9000 ohms or less, go to step 3.
  5. Disconnect SDM harness connector. Inspect connector for signs of corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 7.
  6. Replace SDM harness connector. Go to step 12.
  7. Using Digital Multimeter (J-39200), measure resistance between SDM harness terminal No. A11 and ground. (Scheme 52) If resistance is less than infinite, go to next step. If resistance is infinite, go to step 9.
  8. Repair short to ground in circuit 1834. Go to step 12.
  9. Using Digital Multimeter (J-39200), measure resistance between SDM harness terminal No. A12 and ground. (Scheme 52) If resistance is less than infinite, go to next step. If resistance is infinite, go to step 11.
  10. Repair short to ground in circuit 1751. Go to step 12.
  11. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  12. Reconnect all SIR components. Ensure that all components are properly mounted. Turn ignition on. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).

SDM monitors front end discriminating sensor for frontal impact detection. SDM processes signal from front end discriminating sensor to further support air bag deployment. Discriminating sensor is an input only device for SDM and does not trigger air bag deployment. When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM then performs continuous diagnostic tests on deployment loops. If voltage out of range test detects a short to voltage condition, SDM will not run deployment loop resistance test.

DTC will set when

  1. IGNITION POSITIVE VOLTAGE is within normal operating range.
  2. SDM monitors discriminating sensor loop with ignition on.
  3. Voltage at discriminating sensor is greater than 3.65 volts for 300 milliseconds.

SDM disables discriminating sensor input, turns on AIR BAG warning light and sets DTC.

DTC clears when voltage at discriminating sensor signal input is less than 3.65 volts for 300 milliseconds. DTC will also clear when CLEAR CODES command is issued via scan tool. History DTC clears when 255 malfunction-free ignition cycles have occurred.

An intermittent condition is likely to be caused by a short to ground condition in discriminating sensor circuit. Inspect wiring in circuit 1834 and 1751 carefully for cutting or chafing.

Note. For circuit number and wire color identification, See WIRING DIAGRAMS .

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).
  2. Turn ignition off. Disconnect front-end discriminating sensor. Inspect discriminating sensor and harness connector for signs of corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 4.
  3. Replace discriminating sensor, replace sensor. See «FRONT-END DISCRIMINATING SENSOR»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 16.
  4. Using Digital Multimeter (J-39200), measure resistance between front end discriminating sensor terminals. If resistance is 9000-11000 ohms, go to next step. If the resistance is not 9000-11000 ohms, go to step 3.
  5. Disconnect SDM harness connector. Inspect connector for signs of corrosion, damaged terminals or poor connections. If damage is found, go to next step. If no damage is found, go to step 7.
  6. Replace SDM harness connector. Go to step 12.
  7. Using Digital Multimeter (J-39200), measure resistance between SDM harness terminal No. A11 and ground. (Scheme 52) If resistance is less than 2 ohms, go to step 9. If resistance is 2 ohms or greater, go to next step.
  8. Repair open or high resistance condition in circuit 1834. Go to step 16.
  9. Using Digital Multimeter (J-39200), measure resistance between SDM harness terminal No. A12 and ground. (Scheme 52) If resistance is less than 2 ohms, go to step 11. If resistance is 2 ohms or greater, go to next step.
  10. Repair open or high resistance condition in circuit 1751. Go to step 16.
  11. Turn ignition on. Using Digital Multimeter (J-39200), measure voltage between SDM harness terminal No. A11 and ground. (Scheme 52) If voltage is more than one volt, go to next step. If voltage is one volt or less, go to step 13.
  12. Repair short to voltage in circuit 1834. Go to step 16.
  13. Using Digital Multimeter (J-39200), measure the voltage between SDM harness terminal No. A12 and ground. (Scheme 52) If voltage is more than one volt, go to next step. If voltage is one volt or less, go to step 15.
  14. Repair short to voltage in circuit 1751. Go to step 16.
  15. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  16. Reconnect all SIR components. Ensure that all components are properly mounted. Turn ignition on. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check).

SDM contains sensing devices which convert vehicle velocity changes to an electrical signal. SDM processes electrical signals and compares them to values stored in memory. When signals exceed stored value, additional signal processing is performed and signals are compared to values stored in memory. When 2 signals exceed stored values, SDM causes current to flow through air bag modules, deploying air bags and causing DTC B0051 to set.

DTC sets when POSITIVE IGNITION VOLTAGE is present at SDM, SDM detects a frontal crash, up to 30 degrees off centerline of vehicle of sufficient force to warrant deployment of air bags.

SDM sets DTC, turns on AIR BAG warning light, and records crash data.

DTC B0051 is a latched code and cannot be cleared. Replace SDM after completing diagnostic procedure.

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check) .
  2. Turn ignition off. If air bags have deployed, go to step 5 . If air bags have not deployed, go to next step.
  3. Inspect front of vehicle and undercarriage for signs of impact. If impact has occurred, go to step 5 . If no impact has occurred, go to next step.
  4. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 6 .
  5. Using scan tool, request SIR DTC display. If DTCs exist, diagnose specific DTC. Replace components and perform inspections as required following an accident.
  6. Reconnect all SIR components. Ensure that all components are properly mounted. Using scan tool, clear all DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check) .

SDM contains a sensing device which converts vehicle velocity changes to an electrical signal. Electrical signal is processed by SDM and compared to a value stored in memory. When signal exceeds stored value, additional signal processing is performed and signals are compared to values stored in memory. When 2 signals exceed stored values, SDM will cause current to flow through air bag modules, deploying air bags. DTC B0053 will set along with DTC B0051 when a deployment occurs while an inflator circuit fault exists that could result in a non-deployment situation in one or both air bag modules.

DTC will set when POSITIVE IGNITION VOLTAGE is present at SDM, and a frontal crash, up to 30 degrees off centerline of vehicle, of sufficient force to warrant deployment of air bags is detected by SDM.

SDM sets DTC, turns on AIR BAG warning light, and records crash data.

DTC B0053 is a latched code and cannot be cleared. Replace SDM after completing diagnostic procedure.

DTC B0053 will be accompanied by another DTC (other than DTC B1000). Repair malfunction causing other DTCs before installing new SDM.

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check) .
  2. Turn ignition off. If air bags have deployed, go to step 5 . If air bags have not deployed, go to next step.
  3. Inspect front of vehicle and undercarriage for signs of impact. If impact has occurred, go to step 5 . If no impact has occurred, go to next step.
  4. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 6 .
  5. Using scan tool, request SIR DTC display. If DTCs are displayed, diagnose and correct DTC. Replace components and perform inspections as required following an accident.
  6. Reconnect all SIR components. Ensure that all components are properly mounted. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check) .

When ignition switch is turned to RUN position, SDM compares restraints ID that is stored in SDM restraints to ID that is stored in Instrument Panel Cluster (IPC). Restraints ID that is being compared contains last 4 digits of SDM part number. Next, SDM compares Vehicle Identification Number (VIN) stored in SDM to VIN stored in IPC and Body Control Module (BCM).

DTC will set when IGNITION POSITIVE VOLTAGE is within normal operating range and restraints ID stored in SDM does not match restraints ID stored in IPC-BCM or VIN information stored in SDM does not match VIN information stored in IPC-BCM.

SDM commands on AIR BAG warning light and disables all air bag deployments.

DTC will clear when restraints ID stored in SDM matches restraints ID sorted in IPC-BCM and VIN information stored in SDM matches VIN information stored in IPC-BCM.

DTC B1001 is an indication that restraints ID or VIN information do not match in SDM, IPC and BCM. If modules were replaced, reprogramming may be required.

  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check) .
  2. Using scan tool, verify that PCM is programmed with correct VIN for vehicle. If programmed VIN is correct, go to step 4 . If programmed VIN is not correct, go to next step.
  3. Using scan tool, program correct VIN into PCM. Go to step 9 .
  4. If IPC-BCM was replaced, go to next step. If IPC-BCM was not replaced, go to step 6 .
  5. Using F2 function key on scan tool, follow instructions for IPC-BCM SPECIAL FUNCTIONS and reprogram the IPC-BCM. This allows IPC-BCM to learn restraints ID from SDM. Using F6 function key on scan tool, follow instructions for IPC-BCM SPECIAL FUNCTIONS to program correct VIN into IPC. Go to step 9 .
  6. Using scan tool, verify that IPC-BCM is programmed with correct VIN by comparing stored VIN in IPC-BCM to VIN stored in PCM. If IPC-BCM is programmed with correct VIN, go to step 8 . If VIN is not correct, go to next step.
  7. Using F6 function key, follow instructions on scan tool under IPC-BCM SPECIAL FUNCTIONS to program correct VIN into IPC-BCM. Go to step 9 .
  8. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.Go to next step.
  9. Reconnect all SIR components. Ensure that all components are properly mounted. Turn ignition on. Using scan tool, clear DTCs. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/chevrolet/cavalier/iii-1995-2005/remont/airbag/#supplemental-inflatable-restraint-system__sir-diagnostic-system-check) .

WIRE REPAIR

SIR system requires special wiring repair procedures due to sensitive nature of circuitry. Wire Repair Kit (J-38125-A) contains special sealed splices for use in repairing SIR wiring. Splices use a heat shrink sleeve with sealing adhesive to produce a sealed splice and a cross-hatched core crimp to produce a positive contact for low energy circuits.

Repair damaged SIR wire harness connectors and terminals (except pigtails) using connector repair assembly packs and splice crimping tool provided. Terminals in SIR system are manufactured from a special metal to provide necessary contact integrity for sensitive, low-energy circuits. These terminals are only available in connector repair assembly packs, and no other terminal should be substituted.

If individual terminals on SDM harness connector are damaged, SDM harness connector must be replaced using SDM harness connector pigtail assembly or SDM harness connector replacement kit. If individual terminals on any other SIR connector are damaged, entire connector must be replaced. Use appropriate connector repair assembly pack. Replace entire SIR wire harness, if necessary to maintain SIR circuit integrity.

DO NOT make wiring, connector or terminal repairs on components with wiring pigtails. If a wiring pigtail is damaged, entire component (including pigtail) should be replaced.

Any wiring other than a pigtail can be repaired by splicing in a new section of wire of same gauge. Sealed splices and crimping tool must be used for these splices. Open wire harness by removing tape as necessary, using a sewing seam ripper. Refer to instructions in kit for wiring repair procedure.

TORQUE SPECIFICATIONS

ApplicationFt-lbs N.m
Sensing & Diagnostic Module (SDM) fasteners10 (14)
Steering column lower support bracket20 (27)
Steering wheel nut30 (41)
Inch-lbs N.m
Driver-side air bag module fasteners89 (10)
Front-end discriminating sensor fasteners89 (10)
Instrument panel trim pad screws18 (2)
Passenger-side air bag module fasteners31 (3.5)

TORQUE SPECIFICATIONS

SIR System Wiring Diagrams (Cavalier & Sunfire). Scheme 57

Scheme 57: SIR System Wiring Diagrams (Cavalier & Sunfire)
Scheme 57: SIR System Wiring Diagrams (Cavalier & Sunfire)

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