Supplemental Inflatable Restraint System Chevrolet Malibu V

DESCRIPTION & OPERATION

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 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 to 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 ignition 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.

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.

CONNECTOR IDENTIFICATION

Note. Refer to illustrations to identify SIR connector terminals. (Scheme 1)- (Scheme 3).

Scheme 1

Scheme 2

Scheme 3

SERVICE 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/malibu/v-1996-2000/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 «TESTING - SYSTEM OPERATION CHECK»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__testing-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/malibu/v-1996-2000/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/malibu/v-1996-2000/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 SIR RECOMMENDED TOOLS table.

SIR RECOMMENDED TOOLS

DISABLING & ACTIVATING AIR BAG SYSTEM

DISABLING SYSTEM

Note. When AIR BAG 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 to LOCK position and remove key.
2. Remove AIR BAG fuse (10 amp) from driver-side instrument panel wiring harness junction block. (Scheme 4) Remove Connector Position Assurance (CPA) clip and disconnect Yellow 2-pin connector located above driver-side instrument panel wiring harness junction block. Remove CPA clip and disconnect Yellow 2-pin connector located above passenger-side instrument panel wiring harness junction block. (Scheme 5)

Scheme 4

Scheme 5

ACTIVATING SYSTEM

Remove key from ignition switch. Connect Yellow 2-pin connector located above driver-side instrument panel wiring harness junction block. Connect Yellow 2-pin connector located above passenger-side instrument panel wiring harness junction block. Install CPA clips. Install AIR BAG fuse. Check system for proper operation. See TESTING - SYSTEM OPERATION CHECK .

POST-COLLISION INSPECTION

When a vehicle has been involved in a collision, certain components of the passive restraint system must be inspected or replaced. See PASSIVE RESTRAINT SYSTEM INSPECTION article in the GENERAL INFORMATION section for post-collision inspection information.

CENTERING COIL ASSEMBLY

Note. There are 2 different types of coils. One rotates clockwise and the other rotates counterclockwise. (Scheme 6)for identification and direction of rotation.

Scheme 6

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 1/2 turns. Release spring lock between locking tabs. (Scheme 6)

DISPOSAL PROCEDURES

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

Scheme 7

1. Before proceeding, see «SERVICE PRECAUTIONS»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__service-precautions). Turn ignition switch OFF, remove key and put on safety glasses. Disconnect driver and passenger-side air bag connectors. (Scheme 4)and (Scheme 5). 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 7) 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 connector. Stretch wires away from car as far as possible.
5. Repeat steps 1) through 4) for passenger-side air bag module. 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/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Temporarily store module with trim facing up. Contact manufacturer for proper disposal instructions.

Scheme 8

1. Before proceeding, see «SERVICE PRECAUTIONS»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__service-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 8)
2. Remove driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION.
3. Place air bag module on ground (preferably outdoors) 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 8) 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 8) 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.

REMOVAL & INSTALLATION

Scheme 9

1. Before proceeding, see «SERVICE PRECAUTIONS»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
2. Remove right-front seat and carpet retainer. Fold back carpet and insulation to access SDM. Remove Connector Position Assurance (CPA) clip and disconnect SDM connector. (Scheme 9) Remove SDM mounting fasteners and SDM.

Installation

1. Mount SDM on vehicle, ensuring arrow is pointing toward front of vehicle. Install SDM fasteners and tighten to 44 INCH lbs. (5 N.m). Reconnect SDM connector and CPA clip.
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/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «TESTING - SYSTEM OPERATION CHECK»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__testing-system-operation-check) .

Removal

1. Before proceeding, see «SERVICE PRECAUTIONS»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__service-precautions) . Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) .
2. Remove driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system) . Remove steering wheel nut. Note mark on steering shaft and steering wheel to ensure proper alignment during installation. Using Steering Wheel Puller (J-1859-A) and Steering Wheel Puller Jaws (J-42120), remove steering wheel.

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 30 ft. lbs. (41 N.m). Install driver-side air bag module. See «AIR BAG MODULES»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «TESTING - SYSTEM OPERATION CHECK»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__testing-system-operation-check) .

Scheme 10

1. Before proceeding, see «SERVICE PRECAUTIONS»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/malibu/v-1996-2000/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/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system). Remove steering wheel. See «STEERING WHEEL»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system). Remove coil assembly retaining ring.
3. Remove upper and lower steering column covers. Remove multifunction lever. Remove coil assembly retaining clip. Unroute SIR coil wire harness and cut plastic zip tie. Remove SIR coil assembly. (Scheme 10)

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. Turn ignition switch to LOCK position. Ensure front wheels face straight ahead. Ensure block tooth and centering mark on shaft are in 12 o'clock position. Center upper shaft assembly. Center SIR coil assembly if necessary. See «CENTERING COIL ASSEMBLY»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__centering-coil-assembly) under ADJUSTMENTS.
2. Align coil assembly with horn tower on canceling cam assembly inner ring and projections on outer ring. Install retaining ring securely in groove on shaft. Route coil wire harness along steering column jacket assembly and install new plastic zip tie.
3. To complete installation, reverse removal procedure. Tighten column cover fasteners to 18 INCH lbs. (2 N.m). Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «TESTING - SYSTEM OPERATION CHECK»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__testing-system-operation-check) .

Scheme 11

1. Before proceeding, see «SERVICE PRECAUTIONS»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
2. Remove Torx screws from back of steering wheel. (Scheme 11) Disconnect CPA clip and air bag connector. Remove air bag module.

To install, reverse removal procedure. Tighten screws to 89 INCH lbs. (10 N.m). Activate air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM . Check system for proper operation. See TESTING - SYSTEM OPERATION CHECK .

Scheme 12

1. Before proceeding, see «SERVICE PRECAUTIONS»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/chevrolet/malibu/v-1996-2000/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system).
2. Remove glove box. Remove air bag module fasteners. Remove module from vehicle. (Scheme 12)

Install air bag module. Install fasteners and tighten to 89 INCH lbs. (10 N.m). Activate air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM . Check system for proper operation. See TESTING - SYSTEM OPERATION CHECK .

TESTING - 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.

DIAGNOSIS & TESTING

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, plug in power source and turn ignition switch to RUN position. Follow scan tool manufacturer instructions for communication with SIR system. Scan tool 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.

TESTING - DIAGNOSTIC

Note. Following diagnostic charts are courtesy of General Motors Corp.

DIAGNOSTIC TROUBLE CODE (DTC) CHART

SIR DIAGNOSTIC SYSTEM CHECK

Circuit Description

Ignition switch supplies IGNITION POSITIVE VOLTAGE to SDM at terminal No. 10 using AIR BAG 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 Chart Step References

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 13) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 13

1. 1 AIR BAG warning light should flash 7 times after ignition switch is turned to RUN position.
2. 2 AIR BAG warning light indicates improper operation. This test differentiates an warning light stays ON condition from an warning light does not come ON condition.
3. 3 AIR BAG warning light should flash 7 times and turn OFF.
4. 4 Checks for proper operation of serial data line.
5. 6 Identifies stored diagnostic trouble codes and whether current or history.
6. 7 Checks for proper operation of serial data line and identifies any stored history diagnostic trouble codes.
7. 9 Refers to appropriate DTC Chart Diagnostic Aids for diagnosis of history DTCs.

When SDM recognizes IGNITION POSITIVE VOLTAGE applied to terminal No. 10 is greater than 8.2 volts, AIR BAG warning light is flashed 7 times to verify operation. SDM performs POWER-ON tests followed by RESISTANCE MEASUREMENT and CONTINUOUS MONITORING tests. When a malfunction is detected, SDM sets a current DTC and turns AIR BAG warning light ON. SDM clears current DTCs and move them to a history file when malfunction is no longer detected or ignition switch is cycled, except for DTCs B1018, B1024, B1051, B1053 and B1071. DTCs B1018, B1024, B1051, and B1053 will not clear using scan tool CLEAR CODES. Repair malfunction that set DTC before replacing SDM.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 14) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 14

1. 2 Confirms a circuit malfunction. If no current malfunction is occurring (History DTC set), refer to Diagnostic Aids for appropriate DTC. SDM should not be replaced for a history DTC other than DTC B1071.
2. 3 Checks for a malfunction introduced into SIR system during diagnostic process. It is unlikely that a malfunctioning SDM would cause a new malfunction to occur during diagnostic process.
3. 4 When all circuitry outside SDM has been found to operate properly, as indicated by appropriate diagnostic chart, replace SDM.

When ignition switch is turned to RUN position, IPC/BFC fuse applies battery voltage to AIR BAG warning light, connected to AIR BAG WARNING INDICATOR terminal No. 7. AIR BAG fuse applies battery voltage to IGNITION POSITIVE VOLTAGE input, terminal No. 10. SDM responds by flashing AIR BAG warning light 7 times. If IGNITION POSITIVE VOLTAGE is outside normal operating range (8.2-17.1 volts), AIR BAG warning light will come ON steady with no DTCs set.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 15)- (Scheme 17). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 15

Scheme 16

Scheme 17

1. 2 Checks for sufficient voltage applied to SDM.
2. 3 Checks excessive voltage applied to SDM.
3. 4 Checks for properly installed CPA clip.
4. 6 Determines whether SDM is turning on AIR BAG warning light.
5. 7 Checks for damaged shorting bar.
6. 9 Checks for short to ground in circuit 358.
7. 10 Checks for short between circuits 358 and 1751.
8. 14 An open AIR BAG fuse would cause AIR BAG warning light to come on steady.
9. 15 Determines whether short to ground caused AIR BAG fuse to open.
10. 16 Determines whether short to ground is in wiring or internal to SDM.
11. 20 Checks for disconnected SDM.
12. 26 Checks for an open in IGNITION POSITIVE VOLTAGE circuit.

When ignition switch is turned to RUN position, IPC/BFC fuse applies IGNITION POSITIVE VOLTAGE to AIR BAG warning light, connected to AIR BAG WARNING INDICATOR terminal No. 7. AIR BAG fuse applies voltage to IGNITION POSITIVE VOLTAGE input terminal No. 10. SDM responds by flashing AIR BAG warning light 7 times.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 18)- (Scheme 20). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 18

Scheme 19

Scheme 20

1. 2 Determines whether malfunction is in SDM circuitry or instrument cluster power feed circuitry.
2. 3 Checks for voltage in warning light circuit.
3. 4 Isolates circuit 358 and checks for short to voltage in circuit 358.
4. 6 Determines whether malfunction is in instrument cluster connector.
5. 8 Determines whether open is due to bad LED.
6. 11 Determines whether power is available to instrument cluster power feed circuit.
7. 12 Checks for short from instrument cluster power feed circuit to ground.
8. 13 Determines whether short to ground due to short in wiring or internal to instrument cluster.
9. 17 Determines whether malfunction is in instrument cluster connector.
10. 19 Determines whether malfunction due to open power feed circuit from IPC/BFC fuse.

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. IGNITION POSITIVE VOLTAGE and deployment voltages are measured to ensure they are within normal ranges. SDM then performs RESISTANCE MEASUREMENT test. PASSENGER LOW terminal No. 4 is grounded through an internal current sink, and PASSENGER HIGH terminal No. 1 is connected to an internal constant current source. By monitoring voltage difference between PASSENGER HIGH and PASSENGER LOW, SDM calculates combined resistance of passenger deployment loop using measured voltage.

Conditions For Setting DTC

DTC sets when driver and passenger deployment loops are not open, shorted to voltage or shorted to ground, and passenger deployment loop resistance is greater than 3 ohms. RESISTANCE MEASUREMENT test occurs only once each ignition cycle when IGNITION POSITIVE VOLTAGE is in normal range.

Action Taken

SDM turns on AIR BAG warning light and sets DTC.

Conditions For Clearing DTC

Current DTC clears when ignition switch is cycled and resistance is less than 3 ohms. History DTC clears when scan tool CLEAR CODES is received or when 250 malfunction-free ignition cycles have occurred. If CLEAR CODES is received, and DTC still exists, DTC will not reappear until next ignition cycle.

Diagnostic Aids

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. 1 or 4, or a poor wire to terminal connection in circuits 1403 or 1404.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 21)- (Scheme 23). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 21

Scheme 22

Scheme 23

1. 2 Checks deployment loop resistance measured by SDM.
2. 3 Checks for proper contact or corrosion of passenger-side air bag connector.
3. 10 Isolates malfunction to one side of passenger-side air bag connector.
4. 12 Checks for proper contact or corrosion of SDM connector.
5. 17 Determines whether malfunction is in circuit 1403.
6. 19 Determines whether malfunction is in circuit 1404.

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. IGNITION POSITIVE VOLTAGE and deployment voltages are measured to ensure they are within normal ranges. SDM then performs RESISTANCE MEASUREMENT test. PASSENGER LOW terminal No. 4 is grounded through an internal current sink, and PASSENGER HIGH terminal No. 1 is connected to an internal constant current source. By monitoring voltage difference between PASSENGER HIGH and PASSENGER LOW, SDM calculates combined resistance of passenger deployment loop using measured voltage.

DTC sets when driver and passenger deployment loops are not open, shorted to voltage or shorted to ground, and passenger deployment loop resistance is less than 1.4 ohms. Test occurs only once each ignition cycle when IGNITION POSITIVE VOLTAGE is in normal range.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when ignition switch is cycled and resistance is greater than 1.4 ohms. History DTC clears when scan tool CLEAR CODES is received or when 250 malfunction-free ignition cycles have occurred. If CLEAR CODES is received, and DTC still exists, DTC will not reappear until next ignition cycle.

An intermittent condition is likely to be caused by a short between circuit 1403 and circuits 347, 348, or 1404, or a malfunctioning shorting bar on passenger-side air bag connector.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 24)and (Scheme 25). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 24

Scheme 25

1. 2 Checks deployment loop resistance measured by SDM.
2. 6 Isolates malfunction to one side of passenger-side air bag connector.
3. 8 Checks for short between circuits 1403 and 1404.
4. 10 Checks for short between circuits 1403 and 348.

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM measures IGNITION POSITIVE VOLTAGE to ensure normal range. SDM then performs DEPLOYMENT LOOP CONTINUITY test, measuring voltage difference between PASSENGER HIGH and PASSENGER LOW.

DTC sets when voltage difference between PASSENGER HIGH terminal No. 1 and PASSENGER LOW terminal No. 4 is greater than or equal to 400 millivolts for 500 milliseconds during DEPLOYMENT LOOP CONTINUITY, RESISTANCE MEASUREMENT, or CONTINUOUS MONITORING tests.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when voltage difference between PASSENGER HIGH terminal No. 1 and PASSENGER LOW terminal No. 4 is less than 400 millivolts for 500 milliseconds. History DTC clears when scan tool CLEAR CODES is received or 250 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. 1 or 4, or an open in circuits 1403 or 1404.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 26)- (Scheme 28). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 26

Scheme 27

Scheme 28

1. 2 Checks deployment loop voltage difference measured by SDM.
2. 3 Checks for proper contact or corrosion of passenger-side air bag connector terminals.
3. 10 Isolates malfunction to one side of passenger-side air bag connector.
4. 12 Checks for proper contact or corrosion of SDM connector.
5. 17 Determines whether malfunction is in circuit 1403.
6. 19 Determines whether malfunction is in circuit 1404.

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. IGNITION POSITIVE VOLTAGE, 23 VLR and deployment loop voltages are measured to ensure they are within normal ranges. SDM monitors voltages at DRIVER LOW terminal No. 3 and PASSENGER LOW terminal No. 4 to detect shorts to ground in air bag module circuits. Service wait time is 10 minutes. See DISABLING & ACTIVATING AIR BAG SYSTEM before replacing SIR components.

DTC sets when driver and passenger deployment loops are not open, driver deployment loop is not shorted to voltage, voltage at DRIVER LOW is greater than 3.3 volts, voltage at PASSENGER LOW is less than 3.3 volts for 500 milliseconds during POWER-ON, RESISTANCE MEASUREMENT, or CONTINUOUS MONITORING tests, and IGNITION POSITIVE VOLTAGE is within normal operating range.

SDM turns on AIR BAG warning light and sets DTCs B1018 and B1071.

DTC clears when malfunction no longer occurs (has been repaired) and SDM has been replaced. DTC B1018 is a latched code and cannot be cleared.

An intermittent condition is likely to be caused by a short to ground in passenger-side air bag module circuit. DTC B1018 would be accompanied by DTC B1071. Inspect circuits 1403 and 1404 carefully for cutting or chafing. If wiring pigtail of passenger-side air bag module is damaged, component must be replaced. Careful inspection of circuits and components indicated on DTC B1018 chart is essential to ensure that replacement SDM is not damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 29)and (Scheme 30). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 29

Scheme 30

1. 2 Determines PASSENGER LOW voltage measured by SDM.
2. 3 Isolates malfunction to one side of passenger-side air bag connector.
3. 5 Determines whether malfunction is in circuit 1403.
4. 7 Determines whether malfunction is in circuit 1404.

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. IGNITION POSITIVE VOLTAGE, 23 VLR and deployment loop voltages are measured to ensure they are within normal ranges. SDM monitors voltages at DRIVER LOW terminal No. 3 and PASSENGER LOW terminal No. 4 to detect shorts to voltage in air bag module circuits.

DTC sets when voltage at DRIVER LOW terminal No. 3 is less than 4.8 volts, voltage at PASSENGER LOW terminal No. 4 is greater than 4.8 volts for 500 milliseconds during CONTINUOUS MONITORING test, and IGNITION POSITIVE VOLTAGE is within normal operation range.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when voltage at PASSENGER LOW terminal No. 4 is less than 4.8 volts for 500 milliseconds. History DTC clears when scan tool CLEAR CODES is received or 250 malfunction-free ignition cycles have occurred.

An intermittent condition is likely to be caused by a short to voltage in passenger-side air bag module circuit. Inspect circuits 1403 and 1404 carefully for cutting or chafing. If wiring pigtail of passenger-side air bag module is damaged, component must be replaced.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 31)and (Scheme 32). For circuit number and wire color identification, see WIRING DIAGRAMS.

1. 2 Determines PASSENGER LOW voltage measured by SDM.
2. 3 Isolates malfunction to one side of passenger-side air bag connector.
3. 5 Determines whether malfunction is in circuit 1403.
4. 7 Determines whether malfunction is in circuit 1404.

DTC B1019: Passenger Deployment Loop Short To Voltage (1 Of 2). Scheme 31

DTC B1019: Passenger Deployment Loop Short To Voltage (2 Of 2). Scheme 32

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. IGNITION POSITIVE VOLTAGE and deployment loop voltages are measured to ensure they are within normal ranges. SDM then performs RESISTANCE MEASUREMENT test. DRIVER LOW terminal No. 3 is grounded through a current sink and a constant current source is connected to DRIVER HIGH terminal No. 2. By monitoring voltage difference between DRIVER HIGH and DRIVER LOW, SDM calculates resistance of driver deployment loop using measured voltage.

DTC sets when driver and passenger deployment loops are not open or shorted to voltage, driver deployment loop is not shorted to ground, and resistance is greater than 3.8 ohms during RESISTANCE MEASUREMENT test. Test is run once each ignition cycle when IGNITION POSITIVE VOLTAGE is within normal operating range.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when driver deployment loop resistance is less than 3.8 ohms and ignition switch is cycled. History DTC clears when scan tool CLEAR CODES is received or 250 malfunction-free ignition cycles have occurred. When scan tool CLEAR CODES is received and fault still exists, DTC will not reappear until next ignition cycle.

An intermittent condition is likely to be caused by poor connection at terminals A or B of SIR coil connector at base of steering column, terminals A or B of driver-side air bag connector at top of steering column, SDM terminals No. 2 or 3, or a poor wire to terminal connection in circuits 347 or 348. Note and compare value of driver deployment loop resistance over multiple ignition cycles to determine intermittent condition.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 33)- (Scheme 36). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 33

Scheme 34

Scheme 35

Scheme 36

1. 2 Checks deployment loop resistance measured by SDM.
2. 3 Checks for proper connection or corrosion of SIR coil connector.
3. 10 Isolates malfunction to one side of driver side air bag connector.
4. 11 Determines whether malfunction is due to driver-side air bag module or SIR coil assembly.
5. 14 Checks proper contact or corrosion of SDM connector.
6. 19 Determines whether malfunction is in circuit 347.
7. 21 Determines whether malfunction is in circuit 348.

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. IGNITION POSITIVE VOLTAGE and deployment loop voltages are measured to ensure they are within normal ranges. SDM then performs RESISTANCE MEASUREMENT test. DRIVER LOW terminal No. 3 is grounded through a current sink and an internal constant current source is connected to DRIVER HIGH terminal No. 2. By monitoring voltage difference between DRIVER HIGH and DRIVER LOW, SDM calculates resistance of driver deployment loop using measured voltage.

DTC sets when driver and passenger deployment loops are not open or shorted to voltage, driver deployment loop is not shorted to ground, and resistance is less than 1.7 ohms during RESISTANCE MEASUREMENT test. Test is run once each ignition cycle when IGNITION POSITIVE VOLTAGE is within normal operating range.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when driver deployment loop resistance is greater than 1.7 ohms and ignition switch is cycled. History DTC clears when scan tool CLEAR CODES is received or 250 malfunction-free ignition cycles have occurred. When scan tool CLEAR CODES is received and fault still exists, DTC will not reappear until next ignition cycle.

An intermittent condition is likely to be caused by a short between circuit 347 and circuits 348, 1403, or 1404, or a malfunctioning shorting bar on driver-side air bag connector or SIR coil connector. Note and compare value of driver deployment loop resistance over multiple ignition cycles to determine intermittent condition.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 37)- (Scheme 41). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 37

Scheme 38

Scheme 39

1. 2 Checks deployment loop resistance measured by SDM.
2. 6 Isolates malfunction to one side of SIR coil connector.
3. 7 Determines whether malfunction is in driver-side air bag or SIR coil assembly.
4. 10 Checks for short between circuits 347 and 348.
5. 12 Checks for short between circuits 347 and 1404.

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. IGNITION POSITIVE VOLTAGE, 23 VLR and deployment loop voltages are measured to ensure they are within normal ranges. SDM monitors voltages at DRIVER LOW terminal No. 3 and PASSENGER LOW terminal No. 4 to detect shorts to ground in air bag module circuits. Service wait time is 10 minutes. See DISABLING & ACTIVATING AIR BAG SYSTEM before replacing SIR components.

DTC sets when driver and passenger deployment loops are not open, passenger deployment loop is not shorted to voltage, voltage at PASSENGER LOW terminal NO. 4 is greater than 3.3 volts, and voltage at DRIVER LOW terminal No. 3 is less than 3.3 volts for 500 milliseconds during POWER-ON, RESISTANCE MEASUREMENT, or CONTINUOUS MONITORING tests, and IGNITION POSITIVE VOLTAGE is within normal operating range.

SDM turns on AIR BAG warning light and sets DTC.

DTC clears when malfunction no longer occurs (has been repaired) and SDM has been replaced. DTC B1024 is a latched code and cannot be cleared.

An intermittent condition is likely to be caused by a short to ground in driver-side air bag module circuit. Inspect circuits 347 and 348 carefully for cutting or chafing. Careful inspection of circuits and components indicated on DTC B1024 chart is essential to ensure that replacement SDM is not damaged. DTC B1024 will be accompanied by DTC B1071. Note and compare value of driver deployment loop resistance over multiple ignition cycles to determine intermittent condition.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 40)and (Scheme 41). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 40

Scheme 41

1. 2 Determines DRIVER LOW voltage measured by SDM.
2. 3 Isolates malfunction to one side of SIR coil connector.
3. 4 Determines whether malfunction is due to driver-side air bag or SIR coil assembly.
4. 7 Determines whether malfunction is in circuit 347.
5. 9 Determines whether malfunction is in circuit 348.

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. IGNITION POSITIVE VOLTAGE, 23 VLR and deployment loop voltages are measured to ensure they are within normal ranges. SDM monitors voltages at DRIVER LOW terminal No. 3 and PASSENGER LOW terminal No. 4 to detect shorts to voltage in air bag module circuits.

DTC sets when voltage at PASSENGER LOW terminal No. 4 is less than 4.8 volts, voltage at DRIVER LOW terminal No. 3 is greater than 4.8 volts for 500 milliseconds during CONTINUOUS MONITORING test, and IGNITION POSITIVE VOLTAGE is within normal operating range.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when voltage at DRIVER LOW terminal No. 3 is less than 4.8 volts for 500 milliseconds. History DTC clears when scan tool CLEAR CODES is received or 250 malfunction-free ignition cycles have occurred.

An intermittent condition is likely to be caused by a short to voltage in air bag module circuit. Inspect circuits 347 and 348 carefully for cutting or chafing. Note and compare value of DRIVER SENSELO to determine intermittent condition.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 42)and (Scheme 43). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 42

Scheme 43

1. 2 Checks DRIVER LOW voltage measured by SDM.
2. 3 Isolates malfunction to one side of SIR coil connector.
3. 4 Determines whether malfunction is in driver-side air bag module or SIR coil assembly.
4. 7 Determines whether malfunction is in circuit 347.
5. 9 Determines whether malfunction is in circuit 348.

When ignition switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. SDM measures to ensure IGNITION POSITIVE VOLTAGE is within normal range. During DEPLOYMENT LOOP CONTINUITY test, SDM measures voltage difference between DRIVER HIGH and DRIVER LOW.

DTC sets when voltage difference between DRIVER HIGH terminal No. 2 and DRIVER LOW terminal No. 3 is greater than or equal to 400 millivolts for 500 milliseconds during DEPLOYMENT LOOP CONTINUITY, RESISTANCE MEASUREMENT, or CONTINUOUS MONITORING tests.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when voltage difference between DRIVER HIGH terminal No. 2 and DRIVER LOW terminal No. 3 is less than 400 millivolts for 500 milliseconds. History DTC clears when scan tool CLEAR CODES is received or 250 malfunction-free ignition cycles have occurred.

An intermittent condition is likely to be caused by a poor connection at driver-side air bag module terminals A or B, SIR coil assembly terminals A or B, SDM terminals No. 2 or 3, or an open in circuit 347 or 348. An intermittent open in SIR coil assembly could also set this DTC. To test for bad SIR coil assembly, clear DTCs, then turn steering wheel back and forth with ignition switch in RUN position. If AIR BAG warning light comes ON and DTC B1026 has set again, SIR coil assembly is probably malfunctioning.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 44)- (Scheme 48). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 44

Scheme 45

Scheme 46

1. 2 Checks deployment loop voltage difference measured by SDM.
2. 3 Checks for proper contact or corrosion of driver-side air bag connector.
3. 10 Isolates malfunction to one side of SIR coil connector.
4. 11 Determines whether malfunction is in driver-side air bag module or SIR coil assembly.
5. 14 Checks for proper contact or corrosion of SDM connector.
6. 19 Determines whether malfunction is in circuit 347.
7. 21 Determines whether malfunction is in circuit 348.

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 causes current to flow through air bag modules, deploying air bags and causing DTC B1051 to set.

DTC sets when 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 clears when malfunction no longer occurs (has been repaired) and SDM has been replaced. DTC B1051 is a latched code and cannot be cleared.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 47) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 47

1. 2 If air bag modules have not deployed, DTC B1051 may have set falsely.
2. 3 If DTC B1051 has set with no signs of frontal impact, DTC has set falsely.

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 causes current to flow through air bag modules, deploying air bags. DTC B1053 sets 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 sets when 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 clears when malfunction no longer occurs (has been repaired) and SDM has been replaced. DTC B1053 is a latched code and cannot be cleared.

DTC B1053 will be accompanied by another DTC (other than DTC B1071). Repair malfunction causing other DTCs before installing new SDM.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 48) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 48

1. 2 If air bag modules have not deployed, DTC B1053 may have set falsely.
2. 3 If DTC B1053 has set with no signs of frontal impact, DTC has set falsely.

When ignition switch is turned to RUN position, battery voltage is applied to AIR BAG warning light and to IGNITION POSITIVE VOLTAGE input terminal No. 10. SDM responds by flashing AIR BAG warning light 7 times. SDM monitors light driver output by comparing output of AIR BAG WARNING INDICATOR terminal No. 7 to microprocessor commanded state.

DTC sets when output state at AIR BAG WARNING INDICATOR terminal No. 7 does not match commanded state of light driver for 400 milliseconds during CONTINUOUS MONITORING test, and IGNITION POSITIVE VOLTAGE is within normal operating range.

SDM sets DTC and attempts to turn on AIR BAG warning light.

Current DTC clears when output state at AIR BAG WARNING INDICATOR terminal No. 7 matches commanded state of light driver for 400 milliseconds. History DTC clears when scan tool CLEAR CODES is received or 250 malfunction-free ignition cycles have occurred.

Refer to AIR BAG WARNING LIGHT COMES ON STEADY and AIR BAG WARNING LIGHT DOES NOT COME ON to diagnose warning light circuit malfunctions.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 49) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 49

1. 2 When SDM is configured for serial data-controlled warning light, DTC B1061 will set.

DTC B1071: INTERNAL SDM FAILURE

Note. When DTC B1018 or B1024 has been set, DTC B1071 will set, and SDM must be replaced. When scan tool CLEAR CODES is received and malfunction no longer exists, DTCs B1018 or B1024 and B1071 will remain current. Ensure short to ground condition is repaired prior to installing replacement SDM to avoid damage to component.

DTC B1071 indicates potential internal SDM malfunction.

DTC sets when any of the following conditions are detected by SDM

1. 23 VLR voltage is out of normal operating range during POWER-ON or CONTINUOUS MONITORING tests.
2. Crash data recording reserve voltage discharge time failure for 3 consecutive ignition cycles during POWER-ON test.
3. Calculated checksum for internal memory does not match stored value during POWER-ON test.
4. Driver or passenger deployment loop is shorted to ground during CONTINUOUS MONITORING tests.
5. Accelerometer is malfunctioning during POWER-ON or CONTINUOUS MONITORING tests.
6. Driver or passenger current source is malfunctioning during RESISTANCE MEASUREMENT test.
7. Temporary memory storage area is malfunctioning during POWER-ON test.
8. SDM is unable to read from or write to EEPROM during POWER-ON test.
9. Arming sensor inside SDM is not closed during deployment event.
10. Voltage measured at DRIVER LOW and PASSENGER LOW is too low during POWER-ON or CONTINUOUS MONITORING tests.
11. Device in SDM that arms system for deployment is malfunctioning during POWER-ON or CONTINUOUS MONITORING tests.
12. Permanent memory storage area is malfunctioning during POWER-ON test.

SDM sets DTC and turns on AIR BAG warning light.

Current DTC clears when malfunction has not been detected for 500 milliseconds. History DTC clears when scan tool CLEAR CODES is received or 250 malfunction-free ignition cycles have occurred.

When scan tool CLEAR CODES is received, some malfunctions only allow AIR BAG warning light to go out briefly then come back on.

Scheme 50

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

TORQUE SPECIFICATIONS

SIR Wiring Diagram. Scheme 51

See also:
• COMPUTER RELEARN PROCEDURES
• PASSIVE RESTRAINT SYSTEM INSPECTION
• SERVICE PRECAUTIONS
• DISABLING & ACTIVATING AIR BAG SYSTEM
• TESTING - SYSTEM OPERATION CHECK
• DISPOSAL PROCEDURES
• SPECIAL TOOLS
• SIR RECOMMENDED TOOLS
• CENTERING COIL ASSEMBLY
• B1071