Air Bag Restraint System Cadillac Catera I

DESCRIPTION & OPERATION

SUPPLEMENTAL INFLATABLE RESTRAINT (SIR) SYSTEM

The Supplemental Inflatable Restraint (SIR) system is designed to protect the driver and passenger in a frontal collision. The driver-side and passenger-side air bag modules will deploy only upon frontal or near frontal impact of no more than 30 degrees off the center line of vehicle. System is not designed to deploy in rear impacts, side impacts, or rollovers. A frontal impact of sufficient severity will cause the Sensing and Diagnostic Module (SDM) to detect this sudden deceleration. The SDM then deploys the air bag modules. Additionally, vehicle is equipped with driver-side and passenger-side front seat belt pretensioners which are also deployed by the Sensing and Diagnostic Module.

The System also incorporates a separate side impact system comprising of air bag impact sensors located in each front door, and side air bag modules located in outside edge of each front seatback. Deployment of side impact system will occur when one of the Side Impact Sensors (SIS) detects a side impact severe enough to warrant deployment. Malfunction monitoring of the SIS is performed by the SDM.

SENSING AND DIAGNOSTIC MODULE (SDM)

The 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 will cause enough current to flow through they system to deploy air bag modules and seat belt pretensioners. The SDM also maintains a 28.5 Volt Loop Reserve (28.5 VLR) energy supply to provide deployment energy in cases where ignition voltage is lost in a frontal crash.

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

SIDE IMPACT SENSORS (SIS)

The Side Impact Sensors (SIS) monitor door velocity changes to detect side crashes which are severe enough to warrant air bag module deployment. When a side crash of sufficient force is detected, SIS on impact side causes enough current flow through air bag modules to deploy respective air bag module.

Additionally, SIS provides diagnostic monitoring of side impact SIR system electrical components. When a malfunction is detected, SIS communicates status of side impact system to SDM.

AIR BAG WARNING LIGHT

AIR BAG warning light is installed in Instrument Panel Cluster (IPC). SDM communicates with IPC using serial data communications. 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.

Shorting bar across terminals No. 7 and 8 of the 8-pin connector shorts circuits to SIR coil and driver-side air bag module when disconnected. This prevents deployment of air bag module when servicing steering column or other SIR components.

AIR BAG MODULES

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

Shorting bars on connectors short circuits to driver-side, passenger-side and side impact air bag modules when disconnected. This prevents deployment of air bag modules when servicing SIR components.

SEAT BELT PRETENSIONERS

Seat belt pretensioners consist of an end buckle and buckle sleeve, a routing cable with piston and piston tube, a mounting bracket and a gas generator. When vehicle is in a frontal crash of sufficient force, SDM causes current to flow through front air bag deployment loops and pretensioner deployment loops. Seat belt pretensioners may deploy without the front air bags in a mild collision and will deploy immediately before front air bags in a mild-to-severe collision.

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 4).

Scheme 1

Scheme 2

Scheme 3

Scheme 4

SERVICE PRECAUTIONS

Observe the following precautions when working with SIR system

1. SDM maintains sufficient voltage to cause air bag deployment for up to one minute after ignition switch is turned OFF. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-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»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-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»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-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»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-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

1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition switch to LOCK position.
2. Remove key from ignition switch and wait one minute until energy reserve has discharged. Disconnect negative battery cable. System is now disabled.

ACTIVATING SYSTEM

1. With steering wheel turned so vehicle wheels are in straight-ahead position and ignition switch in LOCK position, connect negative battery cable.
2. Stay well away from air bags and turn ignition switch to RUN position. Check system for proper operation. See «TESTING - SYSTEM OPERATION CHECK»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__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

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. While holding coil assembly housing, depress locking tab and rotate center counterclockwise until resistance is felt. Rotate coil center clockwise approximately 2 1/2 turns until arrow in center of coil aligns with arrow on the outer casing. (Scheme 5)

Scheme 5

DISPOSAL PROCEDURES

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

ON-VEHICLE DEPLOYMENT

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__service-precautions). Turn ignition switch OFF, remove key and put on safety glasses. Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system).
2. Cut air bag module harness connector from vehicle leaving at least 6" of wire at the connector. Strip 1/2" (13 mm) of insulation from each wire lead to the connector. Cut 2 deployment wires at least 20 feet long from 18-gauge multi-strand wire. 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 6) 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 2-4 for passenger-side air bag module and seat belt pretensioners. (Scheme 7)and (Scheme 8). Side impact air bag modules must be removed before deploying. See «OFF-VEHICLE DEPLOYMENT»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__off-vehicle-deployment). 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 remaining air bags and pretensioners.
7. If air bag modules or pretensioners do not deploy, carefully remove from vehicle. See «REMOVAL & INSTALLATION»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__removal-installation). Temporarily store module with trim facing up. Contact manufacturer for proper disposal instructions.

Scheme 6

Scheme 7

Scheme 8

OFF-VEHICLE DEPLOYMENT

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-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 9)
2. Remove driver-side air bag module. See «AIR BAG MODULES»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-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 9) Ensure area around air bag module is clear of people and 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 9) 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, side air bag modules and seat belt pretensioners. Pretensioners should be clamped in vise for off-vehicle deployment.
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 modules with trim cover facing up. Contact manufacturer for proper disposal instructions.

Scheme 9

REMOVAL & INSTALLATION

Removal

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system).
2. Remove center console. Remove connector position assurance (CPA) clip and disconnect SDM harness connector from SDM. Remove SDM fasteners. (Scheme 10) Remove SDM.

Scheme 10

Installation

1. Mount SDM on vehicle, ensuring arrow is pointing toward front of vehicle. Install SDM fasteners. (Scheme 10) Tighten to 89 INCH lbs. (10 N.m). Reconnect SDM harness connector and CPA clip.
2. To complete installation, reverse removal procedure. Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system). Check system for proper operation. See «TESTING - SYSTEM OPERATION CHECK»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__testing-system-operation-check).

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system).
2. Remove front door trim panel. Remove front door water deflector. Disconnect SIS harness connector. Remove Torx screws. Remove sensor from mounting plate. (Scheme 11)

Scheme 11

To install, reverse removal procedure. Tighten screws to 45 INCH lbs. (5 N.m). Install trim panel with new fasteners. (Scheme 11) Activate air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM. Check system for proper operation. See TESTING - SYSTEM OPERATION CHECK.

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__service-precautions) . Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system) .
2. Remove driver-side air bag module. See «AIR BAG MODULES»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system) . Reposition locking tab on steering wheel nut. 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 Legs (J-36541-A), remove steering wheel.

1. To install, feed wiring through steering wheel. Align mark on steering wheel with mark on shaft, then install nut. Tighten nut to 21 ft. lbs. (28 N.m). Secure nut with locking tab. Install driver-side air bag module. See «AIR BAG MODULES»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system) .
2. Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «TESTING - SYSTEM OPERATION CHECK»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__testing-system-operation-check) .

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system).
2. Ensure front wheels face straight ahead. Remove driver-side air bag module. See «AIR BAG MODULES»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system). Remove steering wheel. See «STEERING WHEEL»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system). Remove upper steering column cover screw caps and screws. Remove upper cover. Remove tilt lever and rubber protective cover from the ignition lock cylinder. Remove lower steering column cover screws and lower cover. Disconnect SIR coil connector and remove SIR coil. (Scheme 12)

Scheme 12

1. Install SIR coil and connect SIR coil connector. Center SIR coil assembly if necessary. See «CENTERING COIL ASSEMBLY»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__centering-coil-assembly) under ADJUSTMENTS. Install lower steering column cover and screws. Install rubber protective cover to the ignition lock cylinder. Install tilt lever and upper column cover. Install screws and screw caps.
2. Install steering wheel. See «STEERING WHEEL»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system) . Install driver-side air bag module. See «AIR BAG MODULES»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system) . Activate air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system) . Check system for proper operation. See «TESTING - SYSTEM OPERATION CHECK»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__testing-system-operation-check) .

Removal (Driver-Side)

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system).
2. Remove screws from back of steering wheel. (Scheme 13) Disconnect CPA and SIR coil connector from air bag module. Remove air bag module.

Scheme 13

To install, reverse removal procedure. Tighten screws to 72 INCH lbs. (8 N.m). Activate air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM . Check system for proper operation. See TESTING - SYSTEM OPERATION CHECK .

Removal (Passenger-Side)

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system).
2. Remove air bag module trim cover. Remove air bag module fasteners. Remove Connector Position Assurance (CPA) clip and disconnect 2-pin air bag module connector. Remove passenger-side air bag module from vehicle. (Scheme 14)

Scheme 14

To install, reverse removal procedure. Tighten fasteners to 72 INCH lbs. (8 N.m). Activate air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM . Check system for proper operation. See TESTING - SYSTEM OPERATION CHECK .

Removal (Side Impact)

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system).
2. Move seat to full forward position. Remove seatback panel screws and seatback panel. Disconnect air bag harness connector. (Scheme 15) Remove nuts from module and remove from seatback.

Scheme 15

To install, reverse removal procedure. Tighten air bag mounting nuts to 44 INCH lbs. (5 N.m). Activate air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM . Check system for proper operation. See TESTING - SYSTEM OPERATION CHECK .

1. Before proceeding, see «SERVICE PRECAUTIONS»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__service-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/catera/i-1996-2001/remont/airbag/#air-bag-restraint-system__disabling-activating-air-bag-system).
2. Remove front seat. Disconnect pretensioner connector from pretensioner. Remove mounting bolt and pretensioner. (Scheme 16)

Scheme 16

To install, reverse removal procedure. Tighten bolts to 26 ft. lbs. (35 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 ON. Follow scan tool manufacturer instructions for communication with SIR system. Scan tool reads serial data from SDM data line output terminal No. 12 to DLC connector terminal No. 12.

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

AIR BAG warning light flashes 7 times to verify operation when SDM recognizes ignition voltage at terminal No. 5 is greater than 9 volts. SDM performs initialization and continuous monitoring tests. SDM sets a current DTC and illuminates AIR BAG warning light when malfunction is detected. SDM clears current DTCs and moves them to history when malfunction no longer detected and/or ignition switch is cycled.

Diagnostic Aids

Diagnose DTCs in order specified. Failure to do so may result in extended diagnostic time, incorrect diagnosis or incorrect parts replacement.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 17)and (Scheme 18). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 17

Scheme 18

1. 1 AIR BAG warning light should flash 7 times after ignition switch is turned ON.
2. 2 Differentiates warning light stays ON condition from warning light does not come ON condition.
3. 3 AIR BAG warning light should turn OFF after flashing 7 times.
4. 4 Checks for proper operation of serial data line.
5. 6 Identify stored DTCs and whether they are current or history.
6. 7 Checks for proper operation of Serial Data Line and identifies any stored history DTCs.
7. 8 Refers to appropriate DTC Table Diagnostic Aids for diagnosis of history DTCs.

AIR BAG warning light flashes 7 times to verify operation when SDM recognizes ignition voltage at terminal No. 5 is greater than 9 volts. SDM performs initialization and continuous monitoring tests. SDM sets a current DTC and illuminates AIR BAG warning light when malfunction is detected. SDM clears current DTCs and moves them to history when malfunction no longer detected and/or ignition switch is cycled.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 19) For circuit number and wire color identification, see WIRING DIAGRAMS.

Diagnostic Chart Step References

1. Confirms a current malfunction. If no current malfunction is occurring (History DTC set) Diagnostic Aids for appropriate DTC should be referenced. SDM should not be replaced for a History DTC except when directed.
2. Checks for a malfunction introduced into SIR system during diagnostic process. It is extremely unlikely that a malfunctioning SDM would cause a new malfunction to occur during diagnostic process.
3. When all circuitry outside SDM has been found to operate properly, as indicated by appropriate diagnostic chart, then and only then should SDM be replaced.

Scheme 19

Starter switch applies system voltage to ignition input, terminal No. 5, when ignition switch is turned ON. Ignition voltage is applied from SDM to AIR BAG warning light which is connected to AIR BAG WARNING INDICATOR terminal No. 6. SDM responds by flashing AIR BAG warning light 7 times. AIR BAG warning light will come on steady if ignition is outside normal voltage range

SDM harness connector must be properly connected to SDM to disable shorting bar from terminal No. 6 to terminal No. 7 inside SDM harness connector.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 20)and (Scheme 21). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 20

Scheme 21

1. 2 Checks for sufficient ignition voltage applied to SDM.
2. 3 Checks for excessive ignition voltage applied to SDM.
3. 4 Checks for correct connection of SDM harness connector.
4. 6 Checks if SDM is turning on AIR BAG warning light.
5. 8 Checks if malfunction is short to ground in circuit XB20 or short between circuits XB20 and F108.
6. 14 Checks if malfunction is open in ignition feed circuit.
7. 16 Checks if there is a short to ground in ignition feed circuit.

Starter switch applies system voltage to ignition input, terminal No. 5, when ignition switch is turned ON. Ignition voltage is applied from SDM to AIR BAG warning light which is connected to AIR BAG WARNING INDICATOR terminal No. 6. SDM responds by flashing AIR BAG warning light 7 times. AIR BAG warning light will come on steady if ignition is outside normal voltage range

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 22)and (Scheme 23). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 22

Scheme 23

1. 2 Checks if malfunction is in SDM circuitry or instrument cluster power feed circuitry.
2. 3 Checks if open is due to bad bulb.
3. 4 Checks for short from instrument cluster power feed circuit to ground.
4. 9 Checks if malfunction is due to short to battery voltage in circuit XB20.
5. 11 Checks if malfunction is due to open in circuit XB20.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

Conditions For Setting DTC

DTC sets when ignition is within normal voltage range and measured leakage currents to ground are above specified value caused by a short circuit from driver frontal air bag deployment loop to ground.

Action Taken

SDM sets DTC and turns on AIR BAG warning light.

Conditions For Clearing DTC

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A driver-side air bag circuit short to ground or short between communication signal return line of left or right SIS can cause intermittent condition. Inspect circuits BM30, B30, XB42 and XM430 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 24)- (Scheme 26). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 24

Scheme 25

Scheme 26

1. 7 Checks if malfunction is in driver-side air bag.
2. 9 Checks if malfunction is in SIR coil.
3. 11 Checks if malfunction is in circuit BM30.
4. 13 Checks if malfunction is in circuit B30.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and measured leakage currents to ground are above specified value, caused by a short circuit from driver pretensioner deployment loop to ground.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A driver-side pretensioner circuit short to ground or short between communication signal return line of left or right SIS can cause intermittent condition. Inspect circuits AM900, AM950, XM901, XM950, XB42 and XM430 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 27)and (Scheme 28). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 27

Scheme 28

1. 2 Checks for damaged or corroded SDM harness connector.
2. 7 Checks if malfunction is in circuit AM900 or AM950 in SIR wiring harness.
3. 9 Checks if malfunction is in circuit XM901 or XM950 in SIR wiring harness.
4. 11 Checks if malfunction is in circuit AM900 in driver pretensioner wiring harness.
5. 12 Checks if malfunction is in circuit XM901 in driver pretensioner wiring harness.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and measured leakage currents to ground are above specified value, caused by a short circuit from driver frontal air bag deployment loop to VOLTAGE.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A short to voltage in driver-side air bag module circuit or short circuit between communication signal line of left or right SIS can set this DTC. Inspect circuits BM30 and B30 for cutting or chafing. If DTCs 15 and 73 are set, also inspect circuit B41. If DTCs 15 and 83 are set, also inspect circuit M44.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 29)- (Scheme 31). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 29

Scheme 30

Scheme 31

1. 2 Checks if malfunction is in driver-side air bag.
2. 4 Checks if malfunction is in SIR coil.
3. 11 Checks if malfunction is in circuit BM30.
4. 13 Checks if malfunction is in circuit B30.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and measured leakage currents to ground are above specified value, caused by a short circuit from driver pretensioner deployment loop to VOLTAGE.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A short to voltage in driver-side pretensioner circuit or short between communication signal line of left or right SIS can set this DTC. Inspect circuits AM900, AM950, XM901 and XM950 for cutting or chafing. If DTCs 16 and 73 are set, also inspect circuit B41. If DTCs 15 and 83 are set, also inspect circuit M44.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 32)and (Scheme 33). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 32

Scheme 33

1. 2 Checks for damaged or corroded SDM harness connector.
2. 7 Checks if malfunction is in circuits AM900 or AM950 in SIR wiring harness.
3. 9 Checks if malfunction is in circuit XM901 or XM950 in SIR wiring harness.
4. 11 Checks if malfunction is in circuit AM900 in driver pretensioner wiring harness.
5. 12 Checks if malfunction is in circuit XM901 in driver pretensioner wiring harness.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and measured leakage currents to ground are above specified value, caused by a short circuit from passenger frontal air bag deployment loop to ground.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist. History DTC will set. History DTC may be cleared using scan tool.

A passenger-side air bag circuit short to ground between communication signal return line of left or right SIS can cause intermittent condition. Inspect circuits BA10, BP10, XB42 and XM430 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 34)and (Scheme 35). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 34

Scheme 35

1. 7 Checks if malfunction is in passenger-side air bag.
2. 9 Checks if malfunction is in circuit BA10.
3. 11 Checks if malfunction is in circuit BP10.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and measured leakage currents to ground are above specified value caused by a short circuit from passenger pretensioner deployment loop to ground.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A passenger-side pretensioner circuit short to ground between communication signal return line of left or right SIS can cause intermittent condition. Inspect circuits AB900, AB950, XB901, XB950, XB42 and XM430 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 36)and (Scheme 37). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 36

Scheme 37

1. 2 Checks for damaged or corroded SDM harness connector.
2. 7 Checks if malfunction is in circuits AB900 or AB950 in SIR wiring harness.
3. 9 Checks if malfunction is in circuits XB901 or XB950 in SIR wiring harness.
4. 11 Checks if malfunction is in circuit AB900 in pretensioner seat wiring harness.
5. 12 Checks if malfunction is in circuit XB901 in pretensioner seat wiring harness.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition within normal voltage range and measured leakage currents to ground are above specified value, caused by a short circuit from passenger frontal air bag deployment loop to system voltage.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

Short to voltage in passenger-side air bag module circuit or short circuit between communication signal line of left or right SIS can set this DTC. Inspect circuits BA10 and BP10 for cutting or chafing. If DTCs 25 and 73 are set, also inspect circuit B41. If DTCs 25 and 83 are set, inspect circuit M44.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 38)and (Scheme 39). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 38

Scheme 39

1. 7 Checks if malfunction is in passenger-side air bag.
2. 9 Checks if malfunction is in circuit BA10.
3. 11 Checks if malfunction is in circuit BP10.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and measured leakage currents to system voltage are above specified value caused by a short circuit from passenger pretensioner deployment loop to system voltage.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A short to voltage in passenger-side pretensioner circuit or short circuit between communication signal line of left or right SIS can set this DTC. Inspect circuits AB900, AB950, XB901 and XB950 for cutting or chafing. If DTCs 26 and 73 are set, also inspect circuit B41. If DTCs 26 and 83 are set, also inspect circuit M44.

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 Checks for damaged or corroded SDM harness connector.
2. 7 Checks if malfunction is in circuits AB900 or AB950 in SIR wiring harness.
3. 9 Checks if malfunction is in circuit XB901 or XB950 in SIR wiring harness.
4. 11 Checks if malfunction is in circuit AB900 in passenger seat wiring harness.
5. 12 Checks if malfunction is in circuit XB901 in passenger seat wiring harness.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. During RESISTANCE MEASUREMENT TEST, SDM measures voltage difference between DRIVER FRONTAL HIGH and DRIVER FRONTAL LOW. SDM uses measured voltage to calculate resistance of driver deployment loop. Upon passing these tests, if energy reserve is charged, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when combined resistance of the driver-side air bag module, SIR coil assembly, harness wiring circuits BM30 and B30 and connector terminal contact is more than 6 ohms. RESISTANCE MEASUREMENT test checks for this malfunction. The test occurs once each ignition cycle when IGNITION 1 voltage is within normal range.

SDM turns on AIR BAG warning light and sets a DTC.

DTC clears when resistance of driver deployment loop is less than 6 ohms and a scan tool CLEAR CODES command is issued.

An intermittent condition is likely to be caused by poor connection at terminals No. 1 or 2 of SIR coil integral 2-pin connector, terminals No. 7 or 8 of driver-side air bag module coil connector, SDM terminals No. 1 or 2, or a poor wire to terminal connection in circuits BM30 or B30.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 42)- (Scheme 44). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 42

Scheme 43

Scheme 44

1. 3 Checks if malfunction is in driver-side air bag.
2. 5 Checks if malfunction is in SIR coil.
3. 12 Checks if malfunction is in circuit BM30.
4. 14 Checks if malfunction is in circuit B30.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when combined resistance of the driver-side air bag module, SIR coil assembly, harness wiring circuits BM30 and B30 and connector terminal contacts is less than 1.7 ohms. RESISTANCE MEASUREMENT test checks for this malfunction.

SDM turns on AIR BAG warning light and sets a DTC.

DTC clears when a scan tool CLEAR CODES command is issued, circuit has been repaired and conditions which caused current DTC 32 to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

An intermittent condition is likely to be caused by a short between circuit BM30 and B30, a malfunctioning shorting bar in driver-side air bag module, SIR coil, or SDM harness connector above SDM harness connector terminals No. 1 and 2. Inspect circuits BM30 and B30 for cutting or chafing.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 45)- (Scheme 47). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 45

Scheme 46

Scheme 47

1. 3 Checks if malfunction is in driver-side air bag.
2. 5 Checks if malfunction is in SIR coil.
3. 12 Checks for short between circuits BM30 and B30.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when combined resistance of the passenger-side air bag module, harness wiring circuits BA10 and BP10 and connector terminal contact is more than 5 ohms. RESISTANCE MEASUREMENT test checks for this malfunction. The test occurs once each ignition cycle when IGNITION is within normal range.

SDM turns on AIR BAG warning light and sets a DTC.

Current and history DTCs must be cleared using a scan tool CLEAR CODES command. If fault has been corrected, DTC will clear with scan tool. If resistance in passenger side air bag module circuit is less than 5 ohms, current DTC 33 will change to a history DTC and can be cleared with scan tool.

An intermittent condition is likely to be caused by poor connection at passenger-side air bag integral connector, SDM terminals No. 3 or 4, or a poor wire to terminal connection in circuits BA10 or BP10.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 48)- (Scheme 50). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 48

Scheme 49

Scheme 50

1. 2 Checks deployment loop resistance measured by SDM.
2. 7 Checks for proper contact or corrosion of SDM.
3. 12 Isolates malfunction to one side of passenger-side air bag module connector.
4. 14 Checks if malfunction is in circuit BA10.
5. 16 Checks if malfunction is in circuit BP10.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when combined resistance of the passenger-side air bag module, harness wiring circuits BA10 and BP10 and connector terminal contacts is less than 1.1 ohms. RESISTANCE MEASUREMENT test checks for this malfunction.

SDM turns on AIR BAG warning light and sets a DTC.

Current and history DTCs must be cleared using a scan tool CLEAR CODES command. If circuit has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

An intermittent condition is likely to be caused by a short between circuits BM30 and B30, a malfunctioning shorting bar in passenger-side air bag module, SIR coil or SDM harness connector above SDM harness connector terminals No. 3 and 4. Inspect circuits BA10 and BP10 for cutting or chafing. Comparing value of PASSENGER AIR BAG RESISTANCE over multiple ignition cycles can help determine if intermittent condition exists.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 51)- (Scheme 53). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 51

Scheme 52

Scheme 53

1. 2 Checks deployment loop resistance measured by SDM.
2. 3 Checks for proper connection of Orange 2-pin connector.
3. 8 Isolates malfunction to one side of passenger-side air bag module Yellow 2-pin connector.
4. 10 Checks for proper contact or corrosion of SDM connector.
5. 15 Checks for short from circuit BA10 to circuit BP10.

SDM performs TURN-ON tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM uses measured voltage difference between DRIVER BELT HIGH and DRIVER BELT LOW to calculate resistance of driver pretensioner deployment loop. Upon passing these tests, if energy reserve is charged, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when combined resistance of the driver side pretensioner, harness wiring circuits AM900, AM950, XM901 and XM950 and connector terminal contact is more than 4.4 ohms. RESISTANCE MEASUREMENT test checks for this malfunction. The test occurs once each ignition cycle when IGNITION is within normal range.

SDM turns on AIR BAG warning light and sets a DTC.

Current and history DTCs must be cleared using a scan tool CLEAR CODES command. If fault has been corrected, DTC will clear with scan tool. If resistance in driver pretensioner circuit is less than 4.4 ohms, a current DTC will change to a history DTC and can be cleared with scan tool.

An intermittent condition is likely to be caused by poor connection at 8-pin driver seat connector terminals No. 1 and 2, SDM terminals No. 8 and 9, and wire to terminal connections in circuits AM900, AM950, XM901 or XM950, or drivers-side pretensioner integral 2-pin connector. Inspect circuits AM900, XM901, AM950 and XM950 for cutting or chafing. Comparing value of DRIVER PRETENSIONER RESISTANCE over multiple ignition cycles can help determine if intermittent condition exists.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 54)- (Scheme 57). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 54

Scheme 55

Scheme 56

Scheme 57

1. 12 Checks if malfunction is in circuits AM900 or AM950 between SDM harness connector and 8-pin driver seat connector.
2. 14 Checks if malfunction is in circuits XM901 or XM950 between SDM harness connector and 8-pin driver seat connector.
3. 16 Checks if malfunction is in driver pretensioner assembly.
4. 18 Checks if malfunction is in circuit AM900 in driver pretensioner seat harness.
5. 20 Checks if malfunction is in circuit XM901 in driver pretensioner seat harness.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM uses measured voltage difference between DRIVER BELT HIGH and DRIVER BELT LOW to calculate resistance of driver pretensioner deployment loop. Upon passing these tests, if energy reserve is charged, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when combined resistance of the driver side pretensioner, harness wiring circuits AM900, AM950, XM901 and XM950 and connector terminal contacts is less than one ohm. RESISTANCE MEASUREMENT test checks for this malfunction.

SDM turns on AIR BAG warning light and sets a DTC.

Current and history DTCs must be cleared using a scan tool CLEAR CODES command. If fault has been corrected, history DTC will set. DTC will clear with scan tool.

Inspect circuits AM900, XM901, AM950 and XM950 for cutting or chafing. Comparing value of DRIVER PRETENSIONER RESISTANCE over multiple ignition cycles can help determine if intermittent condition exists.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 58)and (Scheme 59). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 58

Scheme 59

1. 2 Determines deployment loop resistance measured by SDM.
2. 8 Checks for proper contact or corrosion of SDM harness connector.
3. 10 Checks for short between circuits AM900 and XB901.
4. 13 Checks for short from circuits AM900 or AM950 to circuits XM901 or XM950.
5. 15 Checks for short in driver pretensioner seat harness.
6. 16 Checks if malfunction is in driver pretensioner assembly.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM uses measured voltage difference between PASSENGER BELT HIGH and PASSENGER BELT LOW to calculate resistance of passenger pretensioner deployment loop. Upon passing these tests, if energy reserve is charged, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when combined resistance of the passenger side pretensioner, harness wiring circuits AM900, AM950, XM901 and XM950 and connector terminal contacts is more than 4.4 ohms. RESISTANCE MEASUREMENT test checks for this malfunction. The test occurs once each ignition cycle when IGNITION is within normal range.

SDM turns on AIR BAG warning light and sets a DTC.

Current and history DTCs must be cleared using a scan tool CLEAR CODES command. If fault has been corrected, DTC will clear with scan tool. If resistance in passenger pretensioner circuit is less than 4.4 ohms, a current DTC will change to a history DTC and can be cleared with scan tool.

An intermittent condition is likely to be caused by poor connection at 8-pin passenger seat connector terminals No. 1 and 2, SDM terminals No. 15 and 45, and wire to terminal connections of circuits AB900, AB950, XB901 or XB950, or passenger-side pretensioner integral 2-pin connector. Inspect circuits AB900, XB901, AM950 and XM950 for cutting or chafing. Comparing value of PASSENGER PRETENSIONER RESISTANCE over multiple ignition cycles can be helpful in determining if intermittent condition exists.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 60)- (Scheme 63). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 60

Scheme 61

Scheme 62

Scheme 63

1. 12 Checks if malfunction is in circuit AB900 or AB950 between SDM harness connector and 8-pin passenger seat connector.
2. 14 Checks if malfunction is in circuit XB901 or XB950 between SDM harness connector and 8-pin passenger seat connector.
3. 16 Checks if malfunction is in passenger pretensioner assembly.
4. 18 Checks if malfunction is in circuit AB900 in passenger pretensioner seat harness.
5. 20 Checks if malfunction is in circuit XB901 in passenger pretensioner seat harness.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM uses measured voltage difference between PASSENGER BELT HIGH and PASSENGER BELT LOW to calculate resistance of passenger pretensioner deployment loop. Upon passing these tests, if energy reserve is charged, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when combined resistance of the passenger pretensioner, harness wiring circuits AB900, AB950, XB901 and XB950, and connector terminal contacts is less than one ohm. RESISTANCE MEASUREMENT test checks for this malfunction.

SDM turns on AIR BAG warning light and sets a DTC.

Current and history DTC must be cleared using a scan tool CLEAR CODES command. If fault has been corrected, history DTC will set. History DTC can be cleared with scan tool.

Inspect circuits AB900, XB901, AM950 and XM950 for cutting or chafing. Comparing value of DRIVER PRETENSIONER RESISTANCE over multiple ignition cycles can help determine if intermittent condition exists.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 64)- (Scheme 66). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 64

Scheme 65

Scheme 66

1. 2 Determines deployment loop resistance measure by SDM.
2. 8 Checks for proper contact or corrosion of SDM connector.
3. 13 Checks for short from circuits AM900 or AM950 to circuits XM901 or XM950.
4. 15 Checks for short in passenger pretensioner seat harness.
5. 16 Checks if malfunction is in passenger pretensioner assembly.

DTC 43: WARNING LAMP CIRCUIT SHORT TO VOLTAGE

Note. Refer to diagnostic chart to repair DTC. (Scheme 67)

When ignition first turned ON, battery voltage is applied to AIR BAG warning light and to ignition input terminal No. 5. SDM responds by flashing AIR BAG warning light 7 times. SDM monitors lamp driver output by comparing output state at AIR BAG WARNING INDICATOR terminal No. 7 to microprocessor commanded state. DTC sets when ignition is above a specified value and output state does not match commanded ON state of lamp driver for 1.25 seconds.

DTC sets when ignition voltage is above a specified value and voltage measured at AIR BAG WARNING INDICATOR terminal No. 6 is above a specified value while lamp driver is commanded ON. This test runs during initialization and CONTINUOUS MONITORING when ignition voltage is above a specified value.

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

Current and history DTCs must be cleared using a scan tool CLEAR CODES command. If fault has been corrected, DTC will clear with scan tool. If output state at AIR BAG WARNING INDICATOR terminal No. 6 matches commanded ON state of lamp driver, current DTC will change to a history DTC and can be cleared with scan tool.

See SIR DIAGNOSTIC SYSTEM CHECK .

Scheme 67

DTC 44: WARNING LAMP CIRCUIT OPEN OR SHORT TO GROUND

Note. Refer to diagnostic chart to repair DTC. (Scheme 68)

When ignition first turned ON, battery voltage is applied to AIR BAG warning light and to ignition input terminal No. 5. SDM responds by flashing AIR BAG warning light 7 times. SDM monitors lamp driver output by comparing output state at AIR BAG WARNING INDICATOR terminal No. 7 to microprocessor commanded state. DTC sets when ignition is above a specified value and output state does not match commanded ON state of lamp driver for 1.25 seconds.

DTC sets when ignition voltage is above a specified value and voltage measured at AIR BAG WARNING INDICATOR terminal No. 6 is above a specified value while lamp driver is commanded ON. This test runs during initialization and CONTINUOUS MONITORING when ignition voltage is above a specified value.

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

Current and history DTCs must be cleared using a scan tool CLEAR CODES command. If fault has been corrected, DTC will clear with scan tool. If output state at AIR BAG WARNING INDICATOR terminal No. 6 matches commanded ON state of lamp driver, current DTC will change to a history DTC and can be cleared with scan tool.

See SIR DIAGNOSTIC SYSTEM CHECK .

Scheme 68

DTC 52: SDM NOT CONFIGURED

Note. Refer to diagnostic chart to repair DTC. (Scheme 69)

SDM performs tests to diagnose critical internal malfunctions when ignition is turned ON. SDM monitors firing loops to detect leakage currents to ground and system voltage in air bags and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when SDM is installed in vehicle in unconfigured state. Replacement SDM must be programmed by technician using scan tool. This malfunction is detected asynchronously when IGNITION voltage is above a specified value.

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

DTC clears when serial data configuration programming via scan tool is successful.

Scheme 69

SDM performs tests to diagnose critical internal malfunctions when ignition is turned ON. Upon passing these tests, ignition, VLR and deployment loop voltages are measured to ensure they are within normal ranges. Next, SDM performs initialization tests. SDM then goes into CONTINUOUS MONITORING mode.

DTC sets when there is mismatch between serial data configuration programming request and SDM determined vehicle system configuration. This malfunction is detected asynchronously when IGNITION voltage is above a specified value.

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

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If fault has been corrected, DTC may be cleared using scan tool. If SDM determines that vehicle system configuration matches serial data configuration programming, a current DTC will change to a history DTC which may be cleared using scan tool.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 70) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 70

1. 2 Checks status of SIR system programming configuration.

DTC 55 is an indication of potential internal SDM malfunction and requires SDM replacement.

DTC sets when internal malfunction is detected by SDM.

SDM turns on AIR BAG warning light and sets a DTC.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If fault has been corrected, DTC may be cleared using scan tool. SDM must be replaced for a current DTC 55.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 71) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 71

1. 2 Checks for current DTC 55.
2. 4 Checks for history DTC 55.

DTC 56: SDM NOT REUSABLE

Note. Refer to diagnostic chart to repair DTC. (Scheme 72)

DTC 56 is an indication of potential internal SDM malfunction and requires SDM replacement.

DTC sets when frontal air bag and pretensioner deployment has been commanded, or there have been 3 pretensioner only or 3 side impact deployments commanded by SDM.

SDM turns on AIR BAG warning light and sets a DTC.

DTC clears when SDM is replaced.

Scheme 72

DTC sets when SDM detects front crash of sufficient force to warrant deployment of air bags.

SDM turns on AIR BAG warning light, sets a DTC and records Crash Data.

DTC clears when SDM is replaced.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 73) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 73

1. 2 Checks if passenger-side air bag has been deployed.
2. 4 Checks for damage to front of vehicle and undercarriage. If passenger-side air bag has not deployed and there are no signs of damage to vehicle, SDM may be malfunctioning.

DTC sets when SDM detects front crash of sufficient force to warrant deployment of air bags.

SDM turns on AIR BAG warning light, sets a DTC and records Crash Data.

DTC clears when SDM is replaced.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 74) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 74

1. 2 Checks if driver-side air bag has been deployed.
2. 4 Checks for damage to front of vehicle and undercarriage. If passenger-side air bag has not deployed and there are no signs of damage to vehicle, SDM may be malfunctioning.

DTC sets when SDM detects front or rear crash of sufficient force to warrant deployment of pretensioners only.

SDM turns on AIR BAG warning light, sets a DTC and records Crash Data

DTC clears when seat belt pretensioners are replaced and scan tool CLEAR CODES command is issued.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 75) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 75

1. 2 Both pretensioners must be replaced in event of deployment.

DTC sets when SDM detects a side impact of sufficient force to warrant deployment of side air bag.

SDM turns on AIR BAG warning light, sets a DTC and records Crash Data

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If fault has been corrected, history DTC will set. History DTC may be cleared using scan tool. SDM must be replaced after 3 pretensioner only deployments or if current DTC cannot be cleared.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 76) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 76

1. 3 DTC 68 may have set falsely if driver side impact air bag module has not deployed.
2. 4 DTC 68 has set falsely if there is no sign of driver side impact.
3. 5 Checks for SDM malfunction setting in DTC.
4. 7 DTC 68 may have set falsely while diagnosing vehicle.

DTC sets when SDM detects a side impact of sufficient force to warrant deployment of side air bag.

SDM turns on AIR BAG warning light, sets a DTC and records Crash Data

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If fault has been corrected, history DTC will set. History DTC may be cleared using scan tool. SDM must be replaced after 3 pretensioner only deployments or if current DTC cannot be cleared.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 77) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 77

1. 3 DTC 69 may have falsely set if passenger side impact air bag module has not deployed.
2. 4 DTC 69 has set falsely if there is no sign of passenger side impact.
3. 5 Checks for SDM malfunction setting in DTC.
4. 7 DTC 69 may have set falsely while diagnosing vehicle.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and an internal fault exists in driver SIS.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A SIS circuit short to ground can cause an intermittent condition. Inspect circuits B41, B42 and XB42 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 78) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 78

1. 2 Checks communication status of driver SIS.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and systems voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range, and measured leakage currents to system voltage or loop resistance of driver SIS loop are above a specified value. This is caused by a short from driver SIS loop to system voltage or an open or high resistance condition in driver SIS loop.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A driver SIS circuit short to ground can cause an intermittent condition. Inspect circuits B41, B42 and XB42 for cutting or chafing. Inspect circuits and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 79)- (Scheme 81). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 79

Scheme 80

Scheme 81

1. 7 Checks if malfunction is a short to voltage in circuit B42 in left door electrical harness.
2. 9 Checks if malfunction is a short to voltage in circuit XB42 in left door electrical harness.
3. 11 Checks if malfunction is a high resistance in circuit B42 in left door electrical harness.
4. 13 Checks if malfunction is high resistance in circuit XB42 in left door electrical harness.
5. 20 Checks if malfunction is short to voltage in circuit B41.
6. 22 Checks if malfunction is short to voltage in circuit XB42 between left door electrical connector and SDM harness connector.
7. 24 Checks if malfunction is high resistance in circuit B41.
8. 26 Checks if malfunction is high resistance in circuit XB42 between left door electrical connector and SDM harness connector.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and measured leakage currents to ground in driver SIS loop are above a specified value. This is caused by a short from SIS loop to ground.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A SIS circuit short to ground can cause an intermittent condition. Inspect circuits B41, B42 and XB42 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 82)and (Scheme 83). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 82

Scheme 83

1. 7 Checks if malfunction is a short to ground in circuit B42 in left door electrical harness.
2. 9 Checks if malfunction is a short to ground in circuit XB42 in left door electrical harness.
3. 16 Checks if malfunction is a short to ground in circuit B41.
4. 18 Checks if malfunction is short to ground in circuit XB42 between left door electrical connector and SDM harness connector.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when neither side impact air bag circuit is open, ignition is within normal voltage range, and measured leakage currents to ground in driver side impact deployment loop are above specified value.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, DTC may be cleared using scan tool.

A frontal driver-side air bag short to ground or short circuit between communication signal return line of left or right SIS can cause intermittent condition. Inspect circuits XB100, AB11, XB42 and XM430 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 84)and (Scheme 85). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 84

Scheme 85

1. 2 Isolates malfunction to one side of driver side impact module integral connector.
2. 4 Isolates malfunction to one side of driver side impact module harness connector.
3. 11 Checks for malfunction in circuit AB11.
4. 13 Checks for malfunction in circuit XB100.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when neither side impact air bag circuit is open, ignition is within normal voltage range, and measured leakage currents to system voltage in driver-side deployment loop are above specified value.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, DTC may be cleared using scan tool.

A short circuit to a voltage source in driver side impact module circuit or short circuit between communication signal line of left or right SIS can set DTC. Inspect circuits XB100 and AB11 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged. If DTCs 73 and 76 are set, also inspect circuit B41. If DTCs 76 and 83 are set, also inspect circuit M44.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 86)and (Scheme 87). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 86

Scheme 87

1. 2 Isolates malfunction to one side of driver side impact module integral connector.
2. 4 Isolates malfunction to one side of driver side impact module harness connector.
3. 11 Checks for malfunction in circuit AB11.
4. 13 Checks for malfunction in circuit XB100.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when driver side impact deployment loop resistance is greater than 4.4 ohms

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, DTC may be cleared using scan tool. If resistance in driver side impact air bag module circuit is less than 4.4 ohms, a current DTC 77 will change to a history DTC 77 which may be cleared using scan tool.

A poor connection at driver side impact air bag module integral 2-pin connector, driver side impact air bag module Yellow 2-pin connector, SDM terminals No. 10 or 11, or wire to terminal connections in circuits XB100 or AB11 can cause an intermittent condition. Inspect circuits XB100 and AB11 for cutting or chafing. Comparing value of LEFT SIDE AIR BAG RESISTANCE over multiple ignition cycles can be helpful in determining intermittent condition.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 88)and (Scheme 89). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 88

Scheme 89

1. 2 Determines deployment loop resistance measured by SDM.
2. 3 Isolates malfunction to one side of driver side impact air bag module integral connector.
3. 5 Isolates malfunction to one side of driver side impact air bag module harness connector.
4. 12 Checks if malfunction is in circuit AB11.
5. 14 Checks if malfunction is in circuit XB100.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side impact air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when driver side impact deployment loop resistance is less than 1.1 ohms.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, DTC may be cleared using scan tool. If resistance of driver side impact air bag module circuit is greater than 1.1 ohms, a current DTC 78 will change to a history DTC 78 which may be cleared using scan tool.

A short circuit between circuits XB100 and AB11 can cause an intermittent condition. Check shorting bar in driver side impact side impact air bag module. Check shorting bar on SDM harness connector above SDM harness terminals No. 10 and 11. Check shorting bar in driver side impact air bag module Yellow 2-pin connector. Check shorting bar in Yellow 2-pin in line connector. Inspect circuits XB100 and AB11 for cutting or chafing. Comparing value of LEFT SIDE AIR BAG RESISTANCE over multiple ignition cycles can be helpful in determining intermittent condition.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 90)and (Scheme 91). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 90

Scheme 91

1. 2 Determines deployment loop resistance measured by SDM.
2. 3 Isolates malfunction to one side of driver side impact air bag module integral connector.
3. 5 Isolates malfunction to one side of driver side impact air bag module harness connector.
4. 12 Checks for short between circuits AB11 and XB100.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and an internal fault exists in passenger SIS.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A SIS circuit short to ground can cause an intermittent condition. Inspect circuits M41, M42, XM430 and XM42 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 92) For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 92

1. 2 Checks communication status of passenger SIS.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and systems voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range, and measured leakage currents to system voltage or loop resistance of passenger SIS loop are above a specified value. This is caused by a short from passenger SIS loop to system voltage or an open or high resistance condition in passenger SIS loop.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A passenger SIS circuit short to ground can cause an intermittent condition. Inspect circuits M44, M42, XM430 and XM42 for cutting or chafing. Inspect circuits and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 93)- (Scheme 95). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 93

Scheme 94

Scheme 95

1. 7 Checks if malfunction is a short to voltage in circuit M42 in right door electrical harness.
2. 9 Checks if malfunction is a short to voltage in circuit XM42 in right door electrical harness.
3. 11 Checks if malfunction is a high resistance in circuit M42 in right door electrical harness.
4. 13 Checks if malfunction is high resistance in circuit XM42 in right door electrical harness.
5. 20 Checks if malfunction is short to voltage in circuit M44.
6. 22 Checks if malfunction is short to voltage in circuit XM430 between right door electrical connector and SDM harness connector.
7. 24 Checks if malfunction is high resistance in circuit M44.
8. 26 Checks if malfunction is high resistance in circuit XM430 between right door electrical connector and SDM harness connector.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground and system voltage in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM then goes into CONTINUOUS MONITORING mode. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when ignition is within normal voltage range and measured leakage currents to ground in passenger SIS loop are above a specified value. This is caused by a short from SIS loop to ground.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, history DTC will set. History DTC may be cleared using scan tool.

A SIS circuit short to ground can cause an intermittent condition. Inspect circuits M44, M42, XM430 and XM42 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 96)and (Scheme 97). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 96

Scheme 97

1. 7 Checks if malfunction is a short to ground in circuit M42 in right door electrical harness.
2. 9 Checks if malfunction is a short to ground in circuit XM42 in right door electrical harness.
3. 16 Checks if malfunction is a short to ground in circuit M44.
4. 18 Checks if malfunction is short to ground in circuit XM430 between right door electrical connector and SDM harness connector.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when neither side impact air bag circuit is open, ignition is within normal voltage range, and measured leakage currents to ground in passenger side impact deployment loop are above specified value.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, DTC may be cleared using scan tool.

A passenger side impact air bag module short to ground or short circuit between communication signal return line of left or right SIS can cause intermittent condition. Inspect circuits AM13, XM14, XB42 and XM430 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 98)and (Scheme 99). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 98

Scheme 99

1. 2 Isolates malfunction to one side of passenger side impact module integral connector.
2. 4 Isolates malfunction to one side of passenger side impact module harness connector.
3. 11 Checks for malfunction in circuit AM13.
4. 13 Checks for malfunction in circuit XM14.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. Upon passing these tests, if energy reserve is charged up, firing transistors are tested. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when neither side impact air bag circuit is open, ignition is within normal voltage range, and measured leakage currents to system voltage in passenger-side deployment loop are above specified value.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, DTC may be cleared using scan tool.

A short circuit to a voltage source in passenger side impact module circuit or short circuit between communication signal line of left or right SIS can set DTC. Inspect circuits AM13 and XM14 for cutting or chafing. Inspect circuit and components to ensure that replacement SDM will not be damaged.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 100)and (Scheme 101). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 100

Scheme 101

1. 2 Isolates malfunction to one side of passenger side impact module integral connector.
2. 4 Isolates malfunction to one side of passenger side impact module harness connector.
3. 11 Checks for malfunction in circuit AM13.
4. 13 Checks for malfunction in circuit XM14.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side air bag module and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when passenger side impact deployment loop resistance is greater than 4.4 ohms

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, DTC may be cleared using scan tool. If resistance in passenger side impact air bag module circuit is less than 4.4 ohms, a current DTC 87 will change to a history DTC 87 which may be cleared using scan tool.

A poor connection at passenger side impact air bag module integral 2-pin connector, passenger side impact air bag module Yellow 2-pin connector, SDM terminals No. 13 or 14, or wire to terminal connections in circuits AM13 or XM14 can cause an intermittent condition. Inspect circuits AM13 and XM14 for cutting or chafing. Comparing value of RIGHT SIDE AIR BAG RESISTANCE over multiple ignition cycles can be helpful in determining intermittent condition.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 102)and (Scheme 103). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 102

Scheme 103

1. 2 Determines deployment loop resistance measured by SDM.
2. 3 Isolates malfunction to one side of passenger side impact air bag module integral connector.
3. 5 Isolates malfunction to one side of passenger side impact air bag module harness connector.
4. 12 Checks if malfunction is in circuit AM13.
5. 14 Checks if malfunction is in circuit XM14.

SDM performs tests to diagnose critical internal malfunctions when ignition switch is turned ON. SDM monitors 6 firing loops to detect leakage currents to ground in frontal and side impact air bag modules and seat belt pretensioner circuits. Deployment loop resistances are measured to ensure they are within normal ranges. SDM service wait time is one minute. See DISABLING & ACTIVATING AIR BAG SYSTEM .

DTC sets when passenger side impact deployment loop resistance is less than 1.1 ohms.

SDM sets DTC and turns on AIR BAG warning light.

Current and history DTCs must be cleared using scan tool CLEAR CODES command. If circuit fault has been repaired and conditions which caused current DTC to set no longer exist, DTC may be cleared using scan tool. If resistance of passenger side impact air bag module circuit is greater than 1.1 ohms, a current DTC 88 will change to a history DTC 88 which may be cleared using scan tool.

A short circuit between circuits AM13 and XM14 can cause an intermittent condition. Check shorting bar in passenger side impact side impact air bag module. Check shorting bar on SDM harness connector above SDM harness terminals No. 13 and 14. Check shorting bar in passenger side impact air bag module Yellow 2-pin connector. Check shorting bar in Yellow 2-pin in line connector. Inspect circuits AM13 and XM14 for cutting or chafing. Comparing value of RIGHT SIDE AIR BAG RESISTANCE over multiple ignition cycles can be helpful in determining intermittent condition.

Note. Following step references refer to test step numbers on diagnostic chart. (Scheme 104)and (Scheme 105). For circuit number and wire color identification, see WIRING DIAGRAMS.

Scheme 104

Scheme 105

1. 2 Determines deployment loop resistance measured by SDM.
2. 3 Isolates malfunction to one side of passenger side impact air bag module integral connector.
3. 5 Isolates malfunction to one side of passenger side impact harness connector.
4. 12 Checks for short between circuits XM14 and AM13.

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 System Wiring Diagram. Scheme 106

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
• OFF-VEHICLE DEPLOYMENT
• REMOVAL & INSTALLATION
• CENTERING COIL ASSEMBLY
• 43
• 44
• 52
• 56
• SIR DIAGNOSTIC SYSTEM CHECK