Supplemental Inflatable Restraint System Cadillac Escalade GMT800

DESCRIPTION & OPERATION

Supplemental Inflatable Restraint (SIR) system is designed to supplement protection provided by driver-side and passenger-side seat belts. A frontal collision of sufficient force will deploy driver-side and passenger-side air bag modules. A side collision of sufficient force will deploy side impact air bag module on side of impact. Steering column and knee bolsters also absorb collision energy.

SIR system consists of Sensing and Diagnostic Module (SDM), driver-side and passenger-side air bag modules, Electronic Frontal Sensors (EFS), driver and passenger side impact air bag modules, Side Impact Sensors (SIS), driver-side and front passenger Seat Position Sensors (SPS), Passenger Presence System (PPS), SIR coil assembly and AIR BAG warning light. SDM maintains a 23 Volt Loop Reserve (VLR) to provide deployment energy for up to one minute after loss of battery voltage.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

SYSTEM OPERATION CHECK

When ignition is turned on, AIR BAG warning light should flash 7 times and then go off. 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 is turned on.

AIR BAG SAFETY PRECAUTIONS

Observe the following precautions when working with SIR system

1. SDM maintains sufficient voltage to cause air bag deployment for up to one minute after ignition is turned off, battery is disconnected or fuse powering SDM is removed. Disable air bag system before working on vehicle. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) .
2. If vehicle interior is exposed to moisture and becomes soaked up to level of SDM, SDM and harness connector must be replaced. SDM could be activated when powered, causing air bag deployment.
3. After repairs, ensure AIR BAG warning light is working properly and no system faults are indicated. See «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .
4. Always wear safety glasses when servicing or handling an air bag module.
5. 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.
6. SIR components should not be subjected to temperatures greater than 150°F (65°C).
7. SIR components should not be used if they have been dropped from a height of 3 feet (0.9 m) or greater.
8. 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.
9. 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/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__disposal-procedures) .
10. At no time should any electrical source be allowed near inflator on back of air bag module.
11. 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 (DTC).
12. When carrying a live air bag module, trim cover should be pointed away from body to minimize injury in case of accidental deployment.
13. DO NOT attempt to service SIR components. If defective, these parts must be replaced.
14. DO NOT probe a wire through insulator. Wire will be damaged and eventually fail due to corrosion.
15. When performing electrical tests, prevent accidental shorting of terminals. Such mistakes can damage fuses or components and may cause a second DTC to set, making diagnosis of original problem more difficult.
16. When performing electrical diagnosis on SIR system, under no circumstances should a volt/ohmmeter, test light or any type of electrical equipment not specified by manufacturer be used.
17. 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.

With Centering Window & Service Lock

Hold SIR coil face up. (Scheme 75) While depressing service lock, rotate coil hub clockwise until it stops. Rotate coil hub counterclockwise slowly until centering window appears Yellow and line-up marks are aligned. Release service lock.

With Centering Window & No Service Lock

Hold SIR coil face up. (Scheme 75) Rotate coil hub clockwise until it stops. Rotate coil hub counterclockwise slowly until centering window appears Yellow and both line-up marks are aligned. Prevent coil hub from moving until installed on steering column.

With Service Lock & No Centering Window

Hold SIR coil assembly with rear side facing up. (Scheme 75) While depressing service lock, rotate coil hub in direction indicated by directional arrow until it stops. Rotate coil hub in opposite direction 2 1/2 turns. Release service lock.

Without Centering Window Or Service Lock

Hold SIR coil assembly face up. (Scheme 75) Rotate coil hub in direction of arrow until it stops. Rotate coil hub in opposite direction 2 1/2 turns. Prevent coil hub from moving until installed on steering column.

Scheme 75

DISABLING & ACTIVATING AIR BAG SYSTEM

Note. SIR components are placed in various zones. Work being performed will determine applicable disabling and activating procedure. See REMOVAL & INSTALLATION. To identify disabling and activating component zones, refer to illustration. (Scheme 76)

Scheme 76

DISABLING SYSTEM

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

Zone 1

1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition off and remove key. Remove SIR fuse (15-amp) from underhood fuse block.
2. Raise and support vehicle. Remove Connector Position Assurance (CPA) clips from driver-side and passenger-side Electronic Frontal Sensors (EFS). (Scheme 77) Disconnect both EFS connectors.

Scheme 77

Zone 2

1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition off and remove key. Remove SIR fuse (15-amp) from underhood fuse block.
2. Remove driver-side door trim panel. Remove Connector Position Assurance (CPA) clip from Side Impact Sensor (SIS) connector. (Scheme 78) Disconnect SIS connector.

Scheme 78

Zone 3

1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition off and remove key. Remove SIR fuse (15-amp) from underhood fuse block.
2. Remove Connector Position Assurance (CPA) clip from driver-side air bag module connector. (Scheme 79) Disconnect driver-side air bag module connector.

Scheme 79

Zone 5

1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition off and remove key. Remove SIR fuse (15-amp) from underhood fuse block.
2. Remove Connector Position Assurance (CPA) clip from passenger-side air bag module connector, located behind instrument panel support. Disconnect passenger-side air bag module connector.

Zone 6

1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition off and remove key. Remove SIR fuse (15-amp) from underhood fuse block.
2. Remove passenger-side door trim panel. Remove Connector Position Assurance (CPA) clip from Side Impact Sensor (SIS) connector. (Scheme 78) Disconnect SIS connector.

Zone 7

1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition off and remove key. Remove SIR fuse (15-amp) from fuse block, located in underhood fuse block.
2. Remove Connector Position Assurance (CPA) clip from driver-side air bag module connector. (Scheme 79) Disconnect driver-side air bag module connector.
3. Remove CPA clip from passenger-side air bag module connector, located behind instrument panel support. Disconnect passenger-side air bag module connector.
4. Remove CPA clip from driver side impact air bag module connector, located under driver seat. (Scheme 80) Disconnect driver side impact air bag module connector. Remove CPA clip from passenger side impact air bag module connector, located under passenger front seat and disconnect connector.

Scheme 80

Zone 9

1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition off and remove key. Remove SIR fuse (15-amp) from underhood fuse block.
2. Remove Connector Position Assurance (CPA) clip from passenger side impact air bag module connector, located under passenger front seat. (Scheme 80) Disconnect passenger side impact air bag module connector.

1. Ensure ignition is off and key is removed. Connect driver-side and passenger-side Electronic Frontal Sensor (EFS) connectors. Install Connector Position Assurance (CPA) clips. Lower vehicle.
2. Install SIR fuse in under hood fuse block. Staying well away from air bag modules, turn ignition on. Check air bag system for proper operation. See «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

1. Ensure ignition is off and key is removed. Connect Side Impact Sensor (SIS) connector. Install Connector Position Assurance (CPA) clip. Install driver-side door trim panel.
2. Install SIR fuse in under hood fuse block. Staying well away from air bag modules, turn ignition on. Check air bag system for proper operation. See «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

1. Ensure ignition is off and key is removed. Connect driver-side air bag module connector. (Scheme 79) Install Connector Position Assurance (CPA) clip.
2. Install SIR fuse in fuse block. Staying well away from air bag modules, turn ignition on. Check air bag system for proper operation. See «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check).

1. Ensure ignition is off and key is removed. Connect passenger-side air bag module connector. Install Connector Position Assurance (CPA) clip.
2. Install SIR fuse in fuse block. Staying well away from air bag modules, turn ignition on. Check air bag system for proper operation. See «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

1. Ensure ignition is off and key is removed. Connect Side Impact Sensor (SIS) connector. Install Connector Position Assurance (CPA) clip. Install passenger-side door trim panel.
2. Install SIR fuse in under hood fuse block. Staying well away from air bag modules, turn ignition on. Check air bag system for proper operation. See «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

1. Ensure ignition is off and key is removed. Connect driver-side air bag module connector. (Scheme 79) Install Connector Position Assurance (CPA) clip.
2. Connect passenger-side air bag module connector, located behind instrument panel support. Install CPA clip.
3. Connect driver side impact air bag module connector. (Scheme 80) Install CPA clip. Connect passenger side impact air bag module connector and install CPA clip.
4. Install SIR fuse in fuse block. Staying well away from air bag modules, turn ignition on. Check air bag system for proper operation. See «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check).

1. Ensure ignition is off and key is removed. Connect passenger side impact air bag module connector, located under passenger front seat. (Scheme 80) Connect passenger side impact air bag module connector.
2. Install SIR fuse in fuse block. Staying well away from air bag modules, turn ignition on. Check air bag system for proper operation. See «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check).

DISPOSAL PROCEDURES

Note. If vehicle is to be scrapped, perform on-vehicle air bag deployment procedure. See ON-VEHICLE DEPLOYMENT . If vehicle will remain in service, perform off-vehicle deployment procedure. See OFF-VEHICLE DEPLOYMENT .

Always deploy air bags before disposal. DO NOT dispose of undeployed air bag modules at normal refuse locations. Undeployed air bag modules contain substances that can cause severe illness or personal injury if damaged during disposal.

ON-VEHICLE DEPLOYMENT

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system). Put on safety glasses.
2. Cut air bag module harness connectors from vehicle leaving at least 6" (152 mm) of wire at the connector for each wire lead. (Scheme 79)& (Scheme 80). Strip 0.50" (13 mm) of insulation from each wire lead to the connector. Cut 2 deployment wires at least 20 feet (6.1 m) long from 18-gauge multi-strand wire. Strip 0.50" (13 mm) of insulation from each connector wire lead. Twist wires together at one end to short.
3. For driver-side air bag module, twist together wires for Stage 1 and Stage 2 high-side deployment loop wires. See «WIRING DIAGRAMS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system). Connect twisted wire pair to end of one deployment wire. (Scheme 81) Bend twisted connection flat and wrap tightly with electrical tape. Repeat procedure for Stage 1 and Stage 2 low-side deployment loop wires. Assemble a deployment harness for passenger-side air bag module in a similar manner.
4. For side impact air bag module leads, connect lead from connector wire to end of each deployment wire. (Scheme 82) Bend twisted connection flat and wrap tightly with electrical tape to insulate. Repeat for remaining connector wire lead.
5. Remove all loose objects from front seat. Ensure no one is in vehicle. Connect deployment harnesses to appropriate air bag module connectors. Stretch wires away from car as far as possible. Cover windshield and front door openings with a drop cloth. Separate deployment harness wire ends for driver-side air bag module. Connect wires to a 12-volt battery. Air bag module should deploy. If air bag does not deploy, go to step 7. If air bag did 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.
6. Repeat deployment procedure for passenger-side and side impact air bag modules. Wear gloves and safety glasses when handling deployed air bag modules. Wash hands with mild soap and water.
7. If air bag module(s) did not deploy, carefully remove from vehicle. See «AIR BAG MODULES»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Temporarily store module with trim cover facing up. Contact manufacturer for additional instructions.

Scheme 81

Scheme 82

OFF-VEHICLE DEPLOYMENT

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Turn ignition 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. (Scheme 83)
2. Remove driver-side air bag module. See «AIR BAG MODULES»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Place driver-side air bag module on ground (preferably outdoors on paved surface) at least 6 feet (1.8 m) 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.
3. Connect driver-side air bag module to deployment harness using Pigtail Adapter (J-38826-75). Ensure area around air bag module is clear of people and objects. Verify that air bag module is resting with trim cover facing up.
4. Separate 2 banana plugs on SIR deployment harness. Connect SIR deployment harness wires to battery. Driver-side air bag module should deploy. If air bag module does not deploy, go to step 6. If air bag module does deploy, 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.
5. Using SIR Deployment Tool (J-39401-B) to hold passenger-side and side impact air bag modules, repeat deployment procedure. For side impact air bag modules, connect air bag module to SIR deployment harness. For passenger-side air bag module, connect air bag module to deployment harness using Pigtail Adapter (J-38826-80).
6. Ensure that SIR deployment harness is disconnected from battery and that 2 banana plugs have been shorted together. Disconnect pigtail adapter from air bag module. Temporarily store air bag module with trim cover facing up. Contact manufacturer for additional instructions.

Scheme 83

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 AIR BAG/SRS COMPONENT INSPECTION & REPLACEMENT TABLES article in the GENERAL INFORMATION section.

REMOVAL & INSTALLATION

Removal & Installation (Driver-side)

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «ZONE 3»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__zone-3) under DISABLING & ACTIVATING AIR BAG SYSTEM.
2. Turn steering wheel 90 degrees to gain access to rear steering wheel holes. Insert a flat-bladed tool into each hole and push leaf springs to release air bag module from retaining pins. (Scheme 84) Turn steering wheel 180 degrees to access remaining holes. Pull air bag module away from steering wheel. Disconnect air bag wire harness from clips on air bag module and steering wheel. Remove Connector Position Assurance (CPA) clips from air bag module connectors and disconnect connectors. Remove driver-side air bag module.
3. To install, reverse removal procedure. Ensure driver-side air bag module retaining pins are latched securely on leaf springs. Activate air bag system. See «ZONE 3»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under DISABLING & ACTIVATING AIR BAG SYSTEM.>>

Scheme 84

Removal & Installation (Passenger-side)

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «ZONE 5»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__zone-5) under DISABLING & ACTIVATING AIR BAG SYSTEM.
2. Remove instrument panel upper trim pad. See «INSTRUMENT PANEL UPPER TRIM PAD»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system). Remove Connector Position Assurance (CPA) clip from air bag module connector and disconnect passenger-side air bag module connector. Remove passenger-side air bag module mounting bolts. Remove passenger-side air bag module from instrument panel. (Scheme 85)
3. To install, reverse removal procedure. Install passenger-side air bag module upper bolts first. Tighten passenger-side air bag module mounting bolts and instrument panel upper trim pad screws to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications). Activate air bag system. See «ZONE 5»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under DISABLING & ACTIVATING AIR BAG SYSTEM.

Scheme 85

Removal & Installation (Side Impact AIR Bag)

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. For driver side impact air bag module, see «ZONE 7»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__zone-7) under DISABLING & ACTIVATING AIR BAG SYSTEM.. For passenger side impact air bag module, see «ZONE 9»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__zone-9) under DISABLING & ACTIVATING AIR BAG SYSTEM..
2. Remove applicable front seat from vehicle. Remove seat back cover. Remove side impact air bag module mounting bolts. (Scheme 86) Remove air bag module retainer. Remove wire harness clips from seat frame. Make note of wire harness positioning in seat frame for use during installation. Remove wire harness from seat frame. Remove side impact air bag module.
3. To install, reverse removal procedure. Ensure that wire harness is installed in same position as it was removed from to prevent damage. Tighten side impact air bag module mounting bolts and front seat mounting nuts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications). Activate air bag system. For passenger side impact air bag module, see «ZONE 9»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under DISABLING & ACTIVATING AIR BAG SYSTEM.. For driver side impact air bag module, see «ZONE 7»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under DISABLING & ACTIVATING AIR BAG SYSTEM..

Scheme 86

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions) . Disable air bag system. See «ZONE 1»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__zone-1) under DISABLING & ACTIVATING AIR BAG SYSTEM.
2. Remove Connector Position Assurance (CPA) clip from applicable EFS connector. Disconnect EFS connector. Remove EFS sensor mounting bolt. Remove EFS.
3. To install, reverse removal procedure. Ensure arrow on EFS is pointing towards front of vehicle. Tighten EFS mounting bolt to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications) . Activate air bag system. See «ZONE 1»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under DISABLING & ACTIVATING AIR BAG SYSTEM.

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Apply parking brake to prevent vehicle movement. On models with automatic transmission, move shift lever to lowest position. On all models, tilt steering wheel to full down position. Carefully pull rearward on corners of IPC trim bezel to remove trim bezel. (Scheme 87)
2. Remove screws retaining IPC to instrument panel. (Scheme 88) Remove IPC from instrument panel by tilting bottom of IPC outward. Disconnect IPC wire harness from IPC. Remove IPC.
3. To install, reverse removal procedure. Tighten IPC screws to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications).

Scheme 87

Scheme 88

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Apply parking brake to prevent vehicle movement.
2. On models with automatic transmission, move shift lever to lowest position. On all models, tilt steering wheel to full down position.
3. Carefully pull rearward on corners of Instrument Panel Cluster (IPC) trim bezel to remove trim bezel. Remove left and right instrument panel end panels. Remove right side air outlets. Remove assist handle by depressing release tabs accessed through air outlet duct holes.
4. Remove left and right A-pillar trim. Remove screws attaching instrument panel upper trim pad to instrument panel. (Scheme 89) Lift upper trim panel away from instrument panel. Disconnect ambient light sensor electrical connector. Remove upper trim pad from vehicle.
5. To install, reverse removal procedure. Tighten trim pad screws to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications).

Scheme 89

PASSENGER PRESENCE SYSTEM (PPS)

Note. Replace PPS as a complete assembly, using all parts provided in service kit.

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Remove front passenger seat cushion trim cover and pad.
2. Disconnect electrical connectors. Remove screws retaining PPS ECU to bottom of passenger seat frame. (Scheme 90) Remove pressure switch from bottom of seat frame. Remove push in retainers that secure PPS bladder to seat cushion frame. (Scheme 91) Remove PPS system from seat.
3. To install, reverse removal procedure. Tighten PPS ECU screws to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications). Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Check system for proper operation. See «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check).

Scheme 90

Scheme 91

1. Remove wire harness cover from lighted rear view mirror cover, if equipped. Using a small flat-blade screwdriver, remove rear view mirror from rear view mirror support. Disconnect electrical connectors. Remove rear view mirror.
2. To install, reverse removal procedure. Calibrate mirror. See «COMPASS CALIBRATION & COMPASS MAGNETIC VARIATION ADJUSTMENT»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__compass-calibration-compass-magnetic-variation) .

1. Move applicable front seat to full forward position. Remove seat back cover and pad. Separate seat foam from cardboard to gain access to retainer on side of seat belt.
2. Remove seat belt side cardboard retainers. Move cardboard outwards to gain access to lower seat belt retractor bolt. Remove seat belt retractor lower bolt. (Scheme 92)
3. Remove retractor tower retaining screw. Remove retractor tower cover. (Scheme 93) Remove upper anchor bolt. (Scheme 94) Remove seat belt retractor from seat.
4. To install, reverse removal procedure. Tighten upper and lower retractor retainer bolts and tower cover screw to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications).

Scheme 92

Scheme 93

Scheme 94

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disconnect applicable under seat electrical connectors. Remove seat from vehicle.
2. Disconnect electrical connector from SPS. (Scheme 95) Drill out rivets retaining SPS to seat track. Remove SPS.
3. To install, reverse removal procedure. Tighten seat mounting bolts and nuts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications).

Scheme 95

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «ZONE 7»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__zone-7) under DISABLING & ACTIVATING AIR BAG SYSTEM.
2. Remove driver seat. Remove carpet retaining sill trim molding. Fold back carpet to access SDM. Remove Connector Position Assurance (CPA) clip from SDM connector. (Scheme 96) Disconnect SDM connector. Remove SDM mounting fasteners. Remove SDM.
3. To install, reverse removal procedure. Tighten driver seat mounting nuts and SDM fasteners to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications). Activate air bag system. See «ZONE 7»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under DISABLING & ACTIVATING AIR BAG SYSTEM.

Scheme 96

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. For driver SIS, see «ZONE 2»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__zone-2) under DISABLING & ACTIVATING AIR BAG SYSTEM.. For passenger SIS, see «ZONE 6»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__zone-6) under DISABLING & ACTIVATING AIR BAG SYSTEM..
2. Remove Connector Assurance Protection (CPA) clip. (Scheme 78) Disconnect SIS electrical connector. Loosen SIS bolts. Remove SIS from door
3. To install, reverse removal procedure. Tighten SIS bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications). Activate air bag system. For passenger SIS, see «ZONE 6»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under DISABLING & ACTIVATING AIR BAG SYSTEM.. For driver SIS, see «ZONE 2»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under DISABLING & ACTIVATING AIR BAG SYSTEM..

SIR COIL ASSEMBLY

Note. New coil assemblies are pre-centered and include a centering tab that is removed when coil is installed.

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions). Disable air bag system. See «ZONE 3»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__zone-3) under DISABLING & ACTIVATING AIR BAG SYSTEM.
2. Remove driver-side air bag module. See «AIR BAG MODULES»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system). Remove steering wheel. See «STEERING WHEEL»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system). On models with tilt column, remove tilt lever by pulling straight out from steering column. On all models, remove screws from lower steering column cover. Remove lower steering column cover. Remove screws from upper steering column cover. Remove upper steering column cover.
3. Remove wire harness from steering column wire harness strap. Remove wire harness straps from wire harness. (Scheme 97) Disconnect SIR coil connector. Remove retaining ring. Remove SIR coil assembly.
4. To install, reverse removal procedure. Tighten upper and lower trim cover screws and steering wheel nut to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications). Activate air bag system. See «ZONE 3»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under DISABLING & ACTIVATING AIR BAG SYSTEM.

Scheme 97

1. Before proceeding, see «AIR BAG SAFETY PRECAUTIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__air-bag-safety-precautions) . Disable air bag system. See «DISABLING & ACTIVATING AIR BAG SYSTEM»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__disabling-activating-air-bag-system) .
2. Remove driver-side air bag module. See «AIR BAG MODULES»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) . Remove horn contact from steering column. Remove steering wheel nut. Scribe a mark on steering wheel and steering shaft for use during assembly. Using Steering Wheel Puller (J-1859-A), remove steering wheel.
3. To install, reverse removal procedure. Tighten steering wheel nut to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__torque-specifications) . Activate air bag system.

DIAGNOSTICS

DIAGNOSTIC TROUBLE CODES (DTC'S)

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

SCAN TOOL DIAGNOSTICS

Scan Tool (Tech 2) reads and clears current and history DTC's. Ensure scan tool contains correct software cartridge for SIR diagnostics. To use scan tool, connect it to Data Link Connector (DLC), located near base of steering column. Plug in power source and turn ignition on. Follow scan tool manufacturer instructions for communication with SIR system.

DIAGNOSTIC PROCEDURES

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

Perform SIR Diagnostic System Check

SIR diagnostic system check should always be starting point for any SIR diagnostics. It checks for proper AIR BAG warning light operation and DTC's using both flash code and scan tool methods. See SIR DIAGNOSTIC SYSTEM CHECK .

Refer To Proper Diagnostic Test

SIR diagnostic system check indicates correct test to diagnose SIR problems. Bypassing procedures may result in extended diagnostic time, incorrect diagnosis and incorrect parts replacement.

Repeat SIR Diagnostic System Check

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

Diagnostic Procedure

1. Observe AIR BAG warning light when turning ignition on. If AIR BAG warning light flashes 7 times, go to next step. If AIR BAG warning light does not flash 7 times, inspect vehicle for damage to wiring system, visible body damage, faulty or intermittent electrical connections or addition of aftermarket devices which could affect SIR operation. Diagnose AIR BAG warning light malfunction. See «AIR BAG WARNING LIGHT CIRCUIT MALFUNCTION»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Install scan tool to Data Link Connector (DLC), located under left side of instrument panel. If scan tool powers up, go to next step. If scan tool does not power up, inspect and repair data link communication circuits.
3. If scan tool communicates with SDM, go to next step. If scan tool does not communicate with SDM, inspect and repair data link communications circuits.
4. Using scan tool, request SIR DTC display. If scan tool displays history or current SIR DTC's, go to next step. If scan tool does not display any SIR DTC's, system is normal.
5. If scan tool displays any DTC's that begin with "U", inspect and repair applicable data link communication circuits and components. If no DTC's are displayed that begin with "U", go to next step.
6. If scan tool displays DTC B1000, go to «DTC B1000»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) . If scan tool does not display DTC B1000, go to next step.
7. If scan tool displays DTC B0092 or B0098, go to next step. If scan tool displays other DTC's, diagnose and repair applicable SIR DTC's. See «DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) table. NOTE: If may be necessary to request Passenger Presence System (PPS) to flash DTC's more than once. To ensure no DTC's are present, perform following procedure several times.
8. Using scan tool, request PPS to flash DTC's several times. See «PASSENGER PRESENCE FLASH CODE PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) . If PPS flashes any current or history DTC's, diagnose and repair applicable SIR DTC's. See «DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) table.

Circuit Description

When ignition is turned on, Sensing and Diagnostic Module (SDM) performs tests to diagnose critical internal malfunctions. When SDM has completed power up mode, SDM will establish communication with Passenger Presence System (PPS). PPS will respond by performing diagnostic tests to check for proper circuit continuity and for shorts to ground or voltage with PPS. If PPS detects a malfunction, PPS will set a Diagnostic Trouble Code (DTC) and send a message to SDM, requesting that SDM disable passenger-side air bag module deployment loop.

Action Taken

SDM disables passenger-side air bag module deployment loop, sets DTC B0092 or B0098 and turns on AIR BAG warning light.

Flash Code Procedure

1. Ensure passenger front seat is empty. Install scan tool to Data Link Connector (DLC), located under left side of instrument panel. NOTE: When PPS codes are flashing, Instrument Panel Cluster (IPC) and dash lights will begin dimming on and off. This is a normal operation during PPS flashing procedure and does not indicate additional system faults.
2. Turn ignition on. Using scan tool, request PPS to flash DTC's. When PPS receives a valid request to flash DTC's PPS will do the following: Illuminate both PASSENGER AIR BAG ON and OFF indicators, located on inside rear view mirror, for one second. Turn off both PASSENGER AIR BAG ON and OFF indicators for one second. Flash the first digit of DTC using the OFF indicator. Count number of flashes to determine first DTC digit. Flash the second digit of DTC using ON indicator. Count number of flashes to determine second DTC digit. When flashing procedure is initiated, PPS will flash all current and history DTC's. After all DTC's have been flashed, PPS will re-flash DTC's that are stored as current DTC's. Any DTC that is not re-flashed is a history DTC.
3. If flashing procedure was unsuccessful, repeat flashing procedure. Due to communication status between SDM and PPS, procedure may need to be repeated until a successful flash sequence has been achieved. Diagnose and repair applicable SIR DTC's. See «DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) table.

COMPASS CALIBRATION & COMPASS MAGNETIC VARIATION ADJUSTMENT

Note. Before calibrating compass, drive vehicle to an area that is magnetically clean and free of large metallic objects such as high tension wires or steel buildings. Ensure there are no magnetized items on inside or outside of vehicle near mirror.

Compass Calibration

1. Ensure mirror has correct compass variation zone number. See «COMPASS MAGNETIC VARIATION ADJUSTMENT»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__compass-magnetic-variation-adjustment) .
2. Start engine. Locate compass switch button. Depending on mirror model, switch button will be marked with COMP, COMPASS or ON/OFF. Press and hold switch button until "C" or "CAL" is displayed in mirror.
3. Drive vehicle in circles at a speed less than 5 mph (8 km/h) until "C" or "CAL" is replaced by a proper vehicle heading. Calibration is complete.

Compass Magnetic Variation Adjustment

1. Locate current geographic location (zone map) using world magnetic variation map. (Scheme 98) Locate compass switch button. Depending on mirror model, switch button will be marked with COMP, COMPASS or ON/OFF.
2. Turn ignition on, with engine off. Press and hold switch until a zone number appears on compass display. Depress compass switch to select desired zone map number. Wait 5 seconds. Mirror display will return to a compass reading. Variance procedure is complete. Calibrate compass. Go to «COMPASS CALIBRATION»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__compass-calibration).

Scheme 98

PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE

Note. Rezeroing procedure must be completed whenever PPS has been serviced or components have been replaced. Read all instructions carefully before beginning procedure.

Rezeroing Procedure

1. Ensure passenger front seat is empty. Ensure all SIR and PPS components, connectors and Connector Position Assurance (CPA) clips are installed correctly. Install scan tool to Data Link Connector (DLC), located under left side of instrument panel. NOTE: All SIR and PPS DTC's must be cleared before rezeroing PPS. Presence of current or history DTC's will prevent PPS from rezeroing.
2. Turn ignition on. Using scan tool, clear SIR and PPS DTC's. Request PPS rezeroing procedure using scan tool.
3. When rezeroing procedure is initiated, PPS will illuminate both PASSENGER AIR BAG ON and OFF indicators, located on rear view mirror until rezeroing procedure in completed: When rezeroing procedure has been successfully completed, PPS will display current system status in rear view mirror indicator. If rezeroing procedure was unsuccessful, both PASSENGER AIR BAG ON and OFF indicators will alternate from no illumination to full illumination in one second intervals for 5 seconds. PPS will treat an unsuccessful rezeroing attempt as a system fault.
4. If rezeroing procedure was unsuccessful, repeat this procedure. Due to communication status between SDM and PPS, rezeroing procedure may need to be repeated until a successful flash sequence has been achieved. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

CONNECTOR IDENTIFICATION

Note. Refer to illustrations to identify SIR connector terminals. (Scheme 99), (Scheme 100), (Scheme 101), (Scheme 102), (Scheme 103), (Scheme 104), (Scheme 105), (Scheme 106) & (Scheme 107).

Scheme 99

Scheme 100

Scheme 101

Scheme 102

Scheme 103

Scheme 104

Scheme 105

Scheme 106

Scheme 107

When ignition is turned on, Sensing and Diagnostic Module (SDM) commands Instrument Panel Cluster (IPC) to flash AIR BAG warning light 7 times while SDM checks SIR system for malfunctions. If SIR system is normal, AIR BAG warning light will then turn off.

Diagnostic Aids

If ignition voltage is outside normal operating range, (9-16 volts), AIR BAG warning light will turn on with no DTC's set. Loss of serial data communication between SDM and IPC will also cause AIR BAG warning light to turn on.

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

1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
2. If IPC is functioning correctly, go to next step. If IPC is not functioning correctly, diagnose and repair IPC.
3. Turn ignition off. Observe AIR BAG warning light while turning ignition on. If AIR BAG warning light flashes 7 times, go to next step. If AIR BAG warning light does not flash 7 times, go to step 10 .
4. Turn ignition off. Install scan tool to Data Link Connector (DLC), located below driver-side instrument panel. Turn ignition on. If scan tool indicates ignition voltage is more than 9 volts, go to next step. If ignition voltage is 9 volts or less, go to step 6 .
5. If ignition voltage is more than 16 volts, inspect vehicle charging system. If ignition voltage is 16 volts or less, go to step 9 . NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
6. Turn ignition off. Check Yellow wire between SDM connector terminal A1 and fuse block connector terminal A5 for an open or high resistance. In an open or high resistance is found and corrected, go to step 13 . If an open or high resistance is not found, go to next step.
7. Check voltage feed circuit from battery to AIR BAG fuse for an open or high resistance. If an open or high resistance is found, go to step 13 . If an open or high resistance is not found, go to next step.
8. Check Black/White wire between SDM connector terminal A18 and ground for an open or high resistance. If an open or high resistance is found and corrected, go to step 13 . If an open or high resistance is not found, go to next step.
9. Disconnect SDM connector. Inspect SDM connector for corrosion or damage. If corrosion or damage is found, replace SDM connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair) . Go to step 13 . If corrosion or damage is not found, go to step 11 .
10. DIsconnect IPC connector. See «INSTRUMENT PANEL CLUSTER (IPC)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Inspect IPC connector for corrosion or damage. If IPC connector is damaged or corroded, replace connector. Go to step 13 . If IPC connector is okay, go to step 12 .
11. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 13 .
12. Replace Instrument Panel Cluster (IPC). See «INSTRUMENT PANEL CLUSTER (IPC)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
13. Reconnect all SIR components. Go to «SYSTEM OPERATION CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__system-operation-check) .

PASSENGER AIR BAG ON and OFF indicators, located on rear view mirror, are used to notify driver when PPS has enabled or disabled the passenger-side air bag module. PPS indicators also inform driver of any PPS malfunctions. When ignition is turned on, PPS ECU is supplied with ignition voltage and commands both PASSENGER AIR BAG ON and OFF indicators on for 5 seconds. PPS ECU conducts tests on PPS components and circuits while both lights are on. If no malfunctions are detected, PPS will turn PASSENGER AIR BAG indicator on or off depending on status of PPS. If a malfunction is detected, PPS will store a Diagnostic Trouble Code (DTC), default PPS to off position and communicate to SDM that a DTC has been set.

A short, open or high resistance in circuits 2307 or 2308 could cause condition.

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

1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Turn ignition off. Disconnect PPS ECU connector. If PPS ECU connector shows signs of corrosion or damage, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 10. If connector is okay, go to next step.
3. Disconnect inside rear view mirror connector, located at rear of mirror assembly. If mirror connector shows signs of damage or corrosion, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 10. If mirror connector is okay, go to next step. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
4. Turn ignition off. Inspect Yellow wire between mirror connector terminal No. 13 and SIR fuse for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found in circuit 1139 and corrected, go to step 10. If a short to ground, an open or high resistance is not found, go to next step.
5. Inspect Dark Green wire between mirror connector terminal No. 4 and PPS ECU connector terminal "M" for a short to ground, an open or high resistance. (Scheme 107) If a short to ground, an open or high resistance is found in circuit 2308 and corrected, go to step 10. If a short to ground, an open or high resistance is not found, go to next step.
6. Inspect Dark Blue wire between mirror connector terminal No. 3 and PPS ECU connector terminal "L" for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found in circuit 2307 and corrected, go to step 10. If a short to ground, an open or high resistance is not found, go to next step.
7. Turn ignition off. Connect a test light between ignition voltage circuit 1139 and PPS OFF air bag indicator circuit 2308. Ensure passenger seat is empty. Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step 9.
8. Replace rear view mirror. See «REAR VIEW MIRROR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 10.
9. Replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to next step.
10. Reconnect all PPS and rear view mirror components. Ensure all components and connectors are connected properly. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure). If condition is not corrected, go to step 2. If condition is corrected, system is normal.

Seat belt tension retractor sensor is used to enhance Passenger Presence System (PPS) when an infant car seat is properly restrained on front outboard passenger seat. Seat tension retractor sensor is a 3-wire potentiometer mounted on lower seat belt anchor, providing input to PPS ECU. When infant car seat is properly restrained, seat belt is tightly secured through car seat. Seat belt pulls on tension sensor and changes voltage signal to PPS sensor. PPS uses voltage signal to help determine if a tightly belted infant car seat is installed. PPS uses inputs from seat belt tension retractor sensor and PPS pressure sensor to determine if passenger-side air bag module should be suppressed or enabled. PPS monitors seat belt tension retractor sensor circuits and sets DTC 023 if a fault is detected.

Conditions For Setting DTC

DTC sets when PPS detects voltage at passenger seat belt tension retractor sensor signal circuit is less than 0.05 volts or greater than 4.5 volts for 500 milliseconds, when PPS detects voltage at passenger seat belt tension retractor sensor 5-volt reference circuit is less than 4.5 volts or greater than 9.1 volts for 500 milliseconds or when PPS detects amperage at passenger seat belt tension retractor sensor low reference circuit is 25 ma or greater for 500 milliseconds.

SDM disables passenger-side air bag module deployment loop and turns on AIR BAG warning light.

Conditions For Clearing DTC

Current DTC clears when condition responsible for setting DTC no longer exists and scan tool CLEAR DTC command has been used to clear DTC's. History DTC clears when 255 malfunction-free ignition cycles have occurred.

Condition can be caused by a short between any combination of circuits 904, 905 and 906. An open or high resistance in any circuit could also cause condition.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Turn ignition off. Disconnect seat belt tension retractor sensor connector. If seat belt tension retractor sensor connector shows signs of corrosion or damage, go to next step. If connector is okay, go to step 4.
3. If seat belt tension retractor sensor terminals are damaged, replace seat belt retractor. See «SEAT BELT RETRACTOR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. If harness connector is damaged, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 15.
4. Disconnect PPS ECU connector. If PPS ECU connector shows signs of corrosion or damage, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 15. If connector is okay, go to next step. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
5. Inspect Yellow wire between seat belt tension retractor sensor terminal "C" and PPS ECU terminal No. 4 for a short to ground, an open or high resistance. (Scheme 107) If a short to ground, an open or high resistance is found and corrected in circuit 904, go to step 15. If short to ground, open or high resistance is not found, go to next step.
6. Inspect Light Blue wire between seat belt tension retractor sensor terminal "A" and PPS ECU terminal No. 16 for a short to ground, an open or high resistance. If short to ground, an open or high resistance is found and corrected in circuit 906, go to step 15. If a short to ground, open or high resistance is not found, go to next step.
7. Inspect Tan wire between seat belt tension retractor sensor terminal "B" and PPS ECU terminal No. 14 for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found and corrected in circuit 905, go to step 15. If short to ground, an open or high resistance is not found, go to next step.
8. Turn ignition on. Test circuit 904 for a short to voltage. If a short to voltage is found and corrected, go to step 15. If a short to voltage is not found, go to next step.
9. Test seat belt tension retractor sensor signal circuit input voltage. If voltage is 0.05-4.5 volts, go to next step. If voltage is not 0.05-4.5 volts, go to step 12.
10. Test circuit 906 for a short to voltage. If a short to voltage is found and corrected, go to step 15. If a short to voltage is not found, go to next step.
11. Test circuit 905 for a short to voltage. If a short to voltage is found and corrected, go to step 15. If a short to voltage is not found, go to next step.
12. Replace seat belt tension retractor sensor. See «SEAT BELT RETRACTOR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
13. Reconnect all SIR and PPS components. Ensure all components are properly mounted. Using scan tool, clear SIR and PPS DTC's. Road test vehicle, then check for DTC's. If DTC is retrieved, go to next step. If DTC is not retrieved, system is normal.
14. Replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to next step.
15. Reconnect all SIR components. Ensure all components are properly mounted. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Road test vehicle, then check for DTC's. If DTC is retrieved, go to step 2. If DTC is not retrieved, system is normal.

Passenger Presence System (PPS) is used to monitor weight of an occupant on front outboard passenger seat and communicate status to SDM as to whether to enable or suppress passenger-side air bag module deployment loop. PPS consists of an Electronic Control Unit (ECU), silicone filled sensor pad, also known as PPS bladder, pressure sensor, seat belt tension retractor sensor, wiring harness and PASSENGER AIR BAG ON and OFF indicators. Weight of front passenger seat occupant is measured as a pressure change within bladder by pressure sensor. If pressure is more than a specified value, PPS will send a signal to enable passenger-side air bag module deployment loop. If pressure is less than a specified value, PPS will send a signal to suppress passenger-side air bag module deployment loop. PPS will notify driver of status via PASSENGER AIR BAG ON and OFF indicators, located on inside rear view mirror. PPS monitors itself for faults and will set DTC if fault is detected. PPS will also notify SDM of fault. SDM will respond by setting either DTC B0092 or DTC B0098.

DTC sets when PPS detects ignition voltage is less than 8 volts for 500 milliseconds.

SDM disables passenger-side air bag module deployment loop and turns on AIR BAG warning light.

Current DTC clears when condition responsible for setting DTC no longer exists and scan tool CLEAR DTC command has been used to clear DTC's. History DTC clears when 255 malfunction-free ignition cycles have occurred.

Condition could be caused by a short, an open or high resistance in ignition voltage circuit between PPS ECU and body relay block.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Turn ignition off. Disconnect PPS ECU connector. If PPS ECU connector shows signs of damage or corrosion, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 7. If PPS ECU connector is okay, go to next step.
3. Disconnect main seat harness connector, located under passenger seat. Inspect both halves of connector for damage or signs of corrosion. If damage or corrosion is found, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 7. If damage or corrosion is not found, go to next step. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
4. Test Black wire between PPS connector terminal No. 5 and ground for an open or high resistance. (Scheme 107) If an open or high resistance is found in circuit 2351 and corrected, go to step 7. If an open or high resistance is not found, go to next step.
5. Test Yellow wire between PPS connector terminal No. 9 and SIR fuse for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found in circuit 1139 and corrected, go to step 7. If an open or high resistance is not found, go to next step.
6. Replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to next step.
7. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to step 2. If DTC's are not retrieved, system is normal.

Passenger Presence System (PPS) is used to monitor weight of an occupant on front outboard passenger seat and communicate status to SDM whether to enable or suppress passenger-side air bag module deployment. PPS consists of an Electronic Control Unit (ECU), silicone filled sensor pad (PPS bladder), pressure sensor, seat belt tension retractor sensor, wiring harness and PASSENGER AIR BAG ON and OFF indicators. Weight of seat occupant is measured as a pressure change within bladder by pressure sensor.

If pressure from occupants weight is less than a specified value, PPS ECU will send a suppress signal to SDM to disable passenger-side air bag module deployment loop. If pressure from occupants weight is more than a specified value, PPS ECU will send an enable signal to SDM to enable passenger-side air bag module deployment loop. PPS will notify driver of enable/suppress status by turning on PASSENGER AIR BAG ON or OFF indicator, located on rear view mirror. PPS monitors itself for faults and will set a DTC if fault is detected. PPS will also notify SDM of fault. SDM will respond by setting DTC B0092 and requesting Instrument Panel Cluster (IPC) to turn on AIR BAG warning light. PPS will set DTC 063 as an indication that PPS is out of calibration.

SDM disables passenger-side air bag module deployment loop and turns on AIR BAG warning light.

DTC is an indication PPS is out of calibration. PPS cannot be recalibrated. Replace PPS after following diagnostic procedure.

Presence of current or history DTC's while attempting to rezero PPS will cause PPS ECU to set DTC B063. Verify all SIR and PPS DTC's have been cleared before rezeroing PPS.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Install a scan tool to Data Link Connector (DLC), located under left side of instrument panel. Turn ignition on. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) . Road test vehicle. If DTC resets, go to next step. If DTC does not reset, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
3. Replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to next step.
4. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Road test vehicle. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .

Passenger Presence System (PPS) is used to monitor weight of an occupant on front outboard passenger seat and communicate status to SDM whether to enable or suppress passenger-side air bag module deployment. PPS consists of an Electronic Control Unit (ECU), silicone filled sensor pad (PPS bladder), pressure sensor, seat belt tension retractor sensor, wiring harness and PASSENGER AIR BAG ON and OFF indicators, located on rear view mirror. Weight of seat occupant is measured as a pressure change within bladder by pressure sensor. Pressure sensor sends a signal to PPS ECU.

If pressure from occupants weight is less than a specified value, PPS ECU will send a suppress signal to SDM to disable passenger-side air bag module deployment loop. If pressure from occupants weight is more than a specified value, PPS ECU will send an enable signal to SDM to enable passenger-side air bag module deployment loop. PPS will notify driver of enable/suppress status by turning on PASSENGER AIR BAG ON or OFF indicator, located on rear view mirror. PPS monitors itself for faults and will set a DTC if fault is detected. PPS will also notify SDM of fault. SDM will respond by setting either DTC B0092 or B0098 and requesting Instrument Panel Cluster (IPC) to turn on AIR BAG warning light.

DTC sets when PPS has lost communication with SDM or when PPS verification identification does not match verification identification in SDM.

SDM disables passenger-side air bag module deployment loop and turns on AIR BAG warning light.

Current DTC clears when condition responsible for setting DTC no longer exists and scan tool CLEAR DTC command has been used to clear DTC's. History DTC clears when 255 malfunction-free ignition cycles have occurred.

DTC B0092 or B0098 will set if PPS has a current malfunction and has set DTC 064. SDM will set DTC B0092 or B0098 as current and command AIR BAG warning light to turn on, notifying driver of any PPS malfunctions. When DTC B0092 or B0098 are present, it is important to check PPS for any current DTC's. See PASSENGER PRESENCE FLASH CODE PROCEDURE .

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Install a scan tool to Data Link Connector (DLC), located under left side of instrument panel. Turn ignition on. Using scan tool, request PPS to flash DTC's. See «PASSENGER PRESENCE FLASH CODE PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system). If PPS indicates DTC 064 is current, go to next step. If DTC 064 is not current, go to step 13.
3. If scan tool indicates that DTC B0098 is current, go to «DTC B0098»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system). If DTC B0098 is not current, go to next step.
4. Turn ignition off. Disconnect PPS ECU connector. Inspect PPS terminals and connector for signs of damage or corrosion. If damage or corrosion are found, go to next step. If damage or corrosion are not found, go to step 6.
5. If PPS ECU terminals are damaged, replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to step 13. If PPS connector is damaged, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 13.
6. Disconnect main seat harness connector, located under passenger front seat. Inspect both halves of connector for corrosion or damage. If connector is damaged, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 13. If connector is okay, go to next step.
7. Disconnect SDM connector. (Scheme 96) If SDM connector terminals are damaged or corroded, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 13. If SDM connector is okay, go to next step. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
8. Inspect PPS serial data circuit for a short to ground, an open or a high resistance. If a short to ground, an open or a high resistance is found and corrected, go to step 13. If a short to ground, an open or a high resistance is not found, go to next step.
9. Turn ignition on. Inspect PPS serial data circuit for a short to voltage. If a short to voltage is found and corrected, go to step 13. If a short to voltage is not found, go to next step.
10. Replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to next step.
11. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to next step. If DTC's are not retrieved, system is normal.
12. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
13. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Road test vehicle, then check for DTC's. If DTC is retrieved, go to step 2. If DTC is not retrieved, system is normal.

Passenger Presence System (PPS) is used to monitor weight of an occupant on front outboard passenger seat and communicate status to SDM whether to enable or suppress passenger-side air bag module deployment. PPS consists of an Electronic Control Unit (ECU), silicone filled sensor pad (PPS bladder), pressure sensor, seat belt tension retractor sensor, wiring harness and PASSENGER AIR BAG ON and OFF indicators, located on rear view mirror. Weight of seat occupant is measured as a pressure change within bladder by pressure sensor. Pressure sensor sends a signal to PPS ECU.

If pressure from occupant weight is less than a specified value, PPS ECU will send a suppress signal to SDM to disable passenger-side air bag module deployment loop. If pressure from occupant weight is more than a specified value, PPS ECU will send an enable signal to SDM to enable passenger-side air bag module deployment loop. PPS will notify driver of enable/suppress status by turning on PASSENGER AIR BAG ON or OFF indicator, located on rear view mirror. PPS monitors itself for faults and will set a DTC if fault is detected. PPS will also notify SDM of fault. SDM will respond by setting DTC B0092 and requesting Instrument Panel Cluster (IPC) to turn on AIR BAG warning light.

DTC sets when PPS detects voltage in PPS sensor signal circuit is less than 0.05 volts or more than 4.5 volts for 500 milliseconds. DTC will also set when PPS detects voltage at PPS sensor 5-volt reference circuit is less than 4.5 volts or more than 9.1 volts for 500 milliseconds or when PPS detects amperage at PPS sensor low reference circuit is 25 ma or more for 500 milliseconds.

SDM disables passenger-side air bag module deployment loop and turns on AIR BAG warning light.

Current DTC clears when condition responsible for setting DTC no longer exists and scan tool CLEAR DTC command has been used to clear DTC's. History DTC clears when 255 malfunction-free ignition cycles have occurred.

Condition can be caused by a short between any combination of circuits 904, 905 and 906. An open or high resistance in any circuit could also cause condition.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Turn ignition off. Disconnect PPS pressure sensor connector. If pressure sensor terminals or wire harness connector show signs of corrosion, go to next step. If pressure sensor terminals and wire harness connector are okay, go to step 4 .
3. If PPS pressure sensor terminals are damaged, replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to step 13 . If harness connector is damaged, replace harness connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair) . Go to step 13 .
4. Disconnect PPS ECU connector. If PPS ECU connector shows signs of corrosion or damage, replace module connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair) . Go to step 13 . If PPS ECU connector is okay, go to next step. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
5. Inspect PPS sensor signal circuit for a short to ground, an open or a high resistance. If a short to ground, an open or a high resistance condition is found and corrected, go to step 13 . If a short to ground, an open or a high resistance is not found, go to next step.
6. Inspect PPS sensor 5-volt reference circuit for a short to ground, an open or a high resistance. If a short to ground, an open or a high resistance condition is found and corrected, go to step 13 . If a short to ground, an open or a high resistance is not found, go to next step.
7. Inspect PPS sensor 5-volt reference circuit for a short to ground, an open or a high resistance. If a short to ground, an open or a high resistance condition is found and corrected, go to step 13 . If a short to ground, an open or a high resistance is not found, go to next step.
8. Turn ignition on. Inspect PPS sensor signal circuit for a short to voltage. If a short to voltage is found and corrected, go to step 13 . If a short to voltage is not found, go to next step.
9. Measure PPS signal circuit input voltage. If voltage is 0.05 to 4.5 volts, go to next step. If voltage is not 0.05 to 4.5 volts, go to step 12 .
10. Inspect PPS 5-volt reference circuit for a short to voltage. If a short to voltage is found and corrected, go to step 13 . If a short to voltage is not found, go to next step
11. Inspect PPS low reference circuit for a short to voltage. If a short to voltage is found and corrected, go to step 13 . If a short to voltage is not found, go to next step.
12. Replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to next step.
13. Reconnect all SIR and PPS components. Verify all components and connectors are properly connected and installed. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Road test vehicle. If DTC is retrieved, go to step 2 . If DTC is not retrieved, system is normal.

When ignition is turned on, Sensing and Diagnostic Module (SDM) performs tests on deployment loops to check for circuit continuity and shorts to ground or voltage.

DTC B0012 will set when Stage 2 deployment loop resistance is less than 1.3 ohms for 500 milliseconds. DTC B0013 will set when Stage 2 deployment loop high-side voltage is less than 2.4 volts and deployment loop resistance is more than 6 ohms for 500 milliseconds or when deployment loop resistance is more than 4.8 ohms for 500 milliseconds. DTC B0014 will set when Stage 2 deployment loop high-side circuit is shorted to ground or voltage for more than 500 milliseconds or when high-side circuit voltage is less than 2.4 volts and deployment loop resistance is less than 6 ohms for 500 milliseconds.

DTC B0016 will set when Stage 1 deployment loop resistance is less than 1.3 ohms for 500 milliseconds. DTC B0017 will set when Stage 1 deployment loop high-side voltage is less than 2.4 volts and deployment loop resistance is more than 6 ohms for 500 milliseconds or when deployment loop resistance is more than 4.8 ohms for 500 milliseconds. DTC B0018 will set when Stage 1 deployment loop high-side circuit is shorted to ground or voltage for more than 500 milliseconds or when high-side circuit voltage is less than 2.4 volts and deployment loop resistance is less than 6 ohms for 500 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when condition responsible for setting DTC no longer exists and scan tool CLEAR DTC command has been used to clear DTC's. History DTC clears when 255 malfunction-free ignition cycles have occurred.

Malfunction is likely to be caused by a short between dual stage air bag module circuits 3024 and 3025 or 3026 and 3027 or circuits 1403 and 1404 for single stage air bag modules. An open or high resistance, a short to ground or voltage in any circuit or a malfunctioning electrical connector or SDM could also cause condition.

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

1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Turn ignition off. Disconnect passenger-side air bag module connector, located under passenger-side instrument panel. If harness-side of connector is damaged, go to next step. If passenger-side air bag module side of connector is damaged, go to step 7. If both sides of connector are okay, go to step 4.
3. Replace harness-side of connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 9.
4. Install SIR Driver/Passenger Load Tool (J-38715-A) using Load Tool Adapter (J-38715-80) for dual stage air bag modules or Load Tool Adapter (J-38715-100) for single stage air bag modules to harness-side of passenger-side air bag module connector. Turn ignition on. Using scan tool, check for SIR DTC's. If DTC B0012, B0013, B0014, B0016, B0017 or B0018 is retrieved as a current code, go to next step. If DTC B0012, B0013, B0014, B0016, B0017 or B0018 is not retrieved as a current code, go to step 7.
5. Turn ignition off. Remove SIR driver/passenger load tool and adapter from harness connector. Disconnect SDM connector. (Scheme 96) If SDM connector is okay, go to next step. If SDM connector shows signs of corrosion or damage, replace SDM connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 9. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
6. When diagnosing air bag system: For dual-stage air bag modules, if DTC B0012 or B0016 is retrieved by scan tool, check for a short between circuits 3026 and 3027 or 3024 and 3025. For single-stage air bag modules, if DTC B0016 is retrieved, check for a short between circuits 1403 and 1404. If condition is found and corrected, go to step 9. If condition is not found, go to step 8. For dual-stage air bag modules, if DTC B0013 or B0017 is retrieved, check for an open or high resistance in circuits 3026 and 3027 or 3024 and 3025. For single-stage air bag modules, if DTC B0017 is retrieved, check for an open or high resistance in circuits 1403 and 1404. If condition is found and corrected, go to step 9. If condition is not found, go to step 8. For dual-stage air bag modules, if DTC B0014 or B0018 is retrieved, check for a short to ground or voltage in circuits 3026 and 3027 or 3024 and 3025. For single-stage air bag modules, if DTC B0018 is retrieved, check for a short to ground or voltage in circuits 1403 and 1404. If condition is found and corrected, go to step 9. If condition is not found, go to step 8.
7. Replace passenger-side air bag module. See «AIR BAG MODULES»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 9.
8. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
9. Reconnect all SIR components. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If current DTC is retrieved by scan tool, go to step 2. If current DTC is not retrieved by scan tool, system is normal.

When ignition is turned on, Sensing and Diagnostic Module (SDM) performs tests on deployment loops to check for circuit continuity and shorts to ground or voltage.

DTC B0022 will set when Stage 1 deployment loop resistance is less than 1.3 ohms for 500 milliseconds. DTC B0024 will set when Stage 1 deployment loop high-side circuit is shorted to ground or voltage for more than 500 milliseconds or when high-side circuit voltage is less than 2.4 volts and deployment loop resistance is less than 6 ohms for 500 milliseconds. DTC B0026 will set when Stage 1 deployment loop high-side voltage is less than 2.4 volts and deployment loop resistance is more than 6 ohms for 500 milliseconds or when deployment loop resistance is more than 4.8 ohms for 500 milliseconds.

DTC B0042 will set when Stage 2 deployment loop resistance is less than 1.3 ohms for 500 milliseconds. DTC B0043 will set when Stage 2 deployment loop high-side circuit is shorted to ground or voltage for more than 500 milliseconds or when high-side circuit voltage is less than 2.4 volts and deployment loop resistance is less than 6 ohms for 500 milliseconds. DTC B0044 will set when Stage 2 deployment loop high-side voltage is less than 2.4 volts and deployment loop resistance is more than 6 ohms for 500 milliseconds or when deployment loop resistance is more than 4.8 ohms for 500 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when condition responsible for setting DTC no longer exists and scan tool CLEAR DTC command has been used to clear DTC's. History DTC clears when 255 malfunction-free ignition cycles have occurred.

Malfunction is likely to be caused by a short between dual-stage air bag module circuits 3020 and 3021 or 3022 and 3023 or by a short between single-stage air bag module circuits 347 and 348. An open or high resistance condition, a short to ground or voltage in any circuit or a malfunctioning electrical connector or SDM could also cause condition.

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

1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Turn ignition off. Disconnect driver-side air bag module connector (lower SIR coil connector), located at base of steering column. (Scheme 79) If harness-side of connector is damaged, go to next step. If SIR coil side of connector is damaged, go to step 9. If both sides of connector are okay, go to step 4.
3. Replace harness-side of connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 11.
4. Install SIR Driver/Passenger Load Tool (J-38715-A) to harness-side of connector using Load Tool Adapter (J-38715-80) for dual stage air bag modules or Load Tool Adapter (J-38715-100) for single stage air bag modules. Turn ignition on. Using scan tool, check for SIR DTC's. If DTC B0022, B0024, B0026, B0042, B0043 or B0044 is retrieved as a current code, go to step 6. If DTC B0022, B0024, B0026, B0042, B0043 or B0044 is not retrieved as a current code, go to next step.
5. Remove SIR driver/passenger load tool from harness-side of connector. Reconnect lower SIR connector. Remove driver-side air bag module. See «AIR BAG MODULES»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Install SIR driver/passenger load tool using Load Tool Adapter (J-38715-120) for dual stage air bag modules or Load Tool Adapter (J-38715-30A) for single stage air bag modules to upper SIR coil connector. Turn ignition on. Using scan tool, check for SIR DTC's. If DTC B0022, B0024, B0026, B0042, B0043 or B0044 is retrieved as a current code, go to step 9. If DTC B0022, B0024, B0026, B0042, B0043 or B0044 is not retrieved as a current code, go to step 8.
6. Turn ignition off. Remove SIR driver/passenger load tool and load tool adapter from harness connector. Disconnect SDM connector. (Scheme 96) If SDM connector is okay, go to next step. If SDM connector shows signs of corrosion or damage, replace SDM connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 11. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
7. When diagnosing air bag system: For dual-stage air bag modules, if DTC B0022 or B0042 is retrieved by scan tool, check for a short between circuits 3020 and 3021 or 3022 and 3023. For single-stage air bag modules, if DTC B0022 is retrieved, check for a short between circuits 347 and 348. If condition is found and corrected, go to step 11. If condition is not found, go to step 10. For dual-stage air bag modules, if DTC B0024 or B0043 is retrieved, check for a short to ground or voltage in circuits 3020, 3021, 3022 and 3023. For single-stage air bag modules, if DTC B0024 is retrieved, check for a short to ground or voltage in circuits 347 and 348. If condition is found and corrected, go to step 11. If condition is not found, go to step 10. For dual-stage air bag modules, if DTC B0026 or B0044 is retrieved, check for an open or high resistance in circuits 3020, 3021, 3022 and 3023. For single-stage air bag modules, if DTC B0026 is retrieved, check for an open or high resistance in circuits 347 and 348. If condition is found and corrected, go to step 11. If condition is not found, go to step 10.
8. Replace driver-side air bag module. See «AIR BAG MODULES»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 11.
9. Replace SIR coil. See «SIR COIL ASSEMBLY»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__sir-coil-assembly) under REMOVAL & INSTALLATION. Go to step 11.
10. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
11. Reconnect all SIR components. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If current DTC is retrieved by scan tool, go to step 2. If current DTC is not retrieved by scan tool, system is normal.

When ignition is turned on, Sensing and Diagnostic Module (SDM) performs tests on deployment loops to check for circuit continuity and shorts to ground or voltage.

DTC B0028 will set when deployment loop resistance is less than 1.3 ohms for 500 milliseconds. DTC B0029 will set when deployment loop high-side voltage is less than 2.4 volts and deployment loop resistance is more than 6 ohms for 500 milliseconds or when deployment loop resistance is more than 4.8 ohms for 500 milliseconds. DTC B0030 will set when deployment loop high-side voltage is greater than 6 volts for 500 milliseconds or when high-side voltage is less than 2.4 volts and deployment loop resistance is less than 6 ohms for 500 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when condition responsible for setting DTC no longer exists and scan tool CLEAR DTC command has been used to clear DTC's. History DTC clears when 255 malfunction-free ignition cycles have occurred.

Malfunction is likely to be caused by a short between circuits 2103 and 2104 or by an open or high resistance condition or by a short to ground or voltage in either circuit. A malfunctioning electrical connector or SDM could also cause condition.

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

1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Turn ignition off. Disconnect passenger side impact air bag module connector, located under seat. (Scheme 80) If either side of connector is damaged, go to next step. If both sides of connector are okay, go to step 4.
3. If side impact side of connector is damaged, replace side impact air bag module wiring harness. Go to step 11. If wiring harness side of connector is damaged, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 11.
4. Install SIR Driver/Passenger Load Tool (J-38715-A) to harness-side of passenger side impact air bag module wire harness connector. Turn ignition on. Using scan tool, check for SIR DTC's. If DTC B0028, B0029 or B0030 is retrieved as a current DTC, go to step 6. If DTC B0028, B0029 or B0030 is not retrieved as a current DTC, go to next step.
5. Turn ignition off. Remove driver/passenger load tool and load tool adapter from connector. Reconnect connector. Disconnect passenger side impact air bag module connector. Install load tool and Load Tool Adapter (J38715-30A) to harness side of connector. Turn ignition on. Using scan tool, check for SIR DTC's. If DTC B0028, B0029 or B0030 is retrieved as a current DTC, go to step 9. If DTC B0028, B0029 or B0030 is not retrieved as a current DTC, go to step 8.
6. Turn ignition off. Remove load tool and load tool adapter from connector. Disconnect SDM connector. (Scheme 96) If SDM connector shows signs of corrosion or damage, replace SDM connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 11. If SDM connector is okay, go to next step. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
7. When diagnosing air bag system: If DTC B0028 is retrieved by scan tool, check for a short between circuits 2103 and 2104. If condition is found and corrected, go to step 11. If condition is not found, go to step 10. If DTC B0029 is retrieved, check for an open or high resistance in circuits 2103 and 2104. If condition is found and corrected, go to step 11. If condition is not found, go to step 10. If DTC B0030 is retrieved, check for a short to ground or voltage in circuits 2103 and 2104. If condition is found and corrected, go to step 11. If condition is not found, go to step 10.
8. Replace side impact air bag module. See «AIR BAG MODULES»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 11.
9. Replace side impact air bag module wiring harness. Go to step 11.
10. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
11. Reconnect all SIR components. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If current DTC is retrieved by scan tool, go to step 2. If current DTC is not retrieved by scan tool, system is normal.

When ignition is turned on, Sensing and Diagnostic Module (SDM) performs tests on deployment loops to check for circuit continuity and shorts to ground or voltage.

DTC B0040 will set when deployment loop resistance is less than 1.3 ohms for 500 milliseconds. DTC B0041 will set when deployment loop high-side voltage is less than 2.4 volts and deployment loop resistance is more than 6 ohms for 500 milliseconds or when deployment loop resistance is more than 4.8 ohms for 500 milliseconds. DTC B0045 will set when deployment loop high-side voltage is more than 6 volts for 500 milliseconds or when high-side voltage is less than 2.4 volts and deployment loop resistance is less than 6 ohms for 500 milliseconds.

SDM turns on AIR BAG warning light and sets DTC.

Current DTC clears when condition responsible for setting DTC no longer exists and scan tool CLEAR DTC command has been used to clear DTC's. History DTC clears when 255 malfunction-free ignition cycles have occurred.

Malfunction is likely to be caused by a short between circuits 2105 and 2106 or by an open or high resistance condition or by a short to ground or voltage in either circuit. A malfunctioning electrical connector or SDM could also cause condition.

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

1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Turn ignition off. Disconnect driver side impact air bag module connector, located under seat. (Scheme 80) If either side of connector is damaged, go to next step. If both sides of connector are okay, go to step 4.
3. If side impact side of connector is damaged, replace side impact air bag module wiring harness. Go to step 11. If wiring harness side of connector is damaged, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 11.
4. Install SIR Driver/Passenger Load Tool (J-38715-A) to harness-side of driver side impact air bag module wire harness connector. Turn ignition on. Using scan tool, check for SIR DTC's. If DTC B0040, B0041 or B0045 is retrieved as a current DTC, go to step 6. If DTC B0040, B0041 or B0045 is not retrieved as a current DTC, go to next step.
5. Turn ignition off. Remove load tool from connector. Reconnect connector. Install SIR Driver/Passenger Load Tool (J-38715-A) using Load Tool Adapter (J-38715-30A) to harness-side of driver side impact air bag module connector. Turn ignition on. Using scan tool, check for SIR DTC's. If DTC B0040, B0041 or B0045 is retrieved as a current DTC, go to step 9. If DTC B0040, B0041 or B0045 is not retrieved as a current DTC, go to step 8.
6. Turn ignition off. Remove load tool from connector. Disconnect SDM connector. (Scheme 96) If SDM connector shows signs of corrosion or damage, replace SDM connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 11. If SDM connector is okay, go to next step. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
7. When diagnosing air bag system: If DTC B0040 is retrieved by scan tool, check for a short between circuits 2105 and 2106. If condition is found and corrected, go to step 11. If condition is not found, go to step 10. If DTC B0041 is retrieved, check for an open or high resistance in circuits 2105 and 2106. If condition is found and corrected, go to step 11. If condition is not found, go to step 10. If DTC B0045 is retrieved, check for a short to ground or voltage in circuits 2105 and 2106. If condition is found and corrected, go to step 11. If condition is not found, go to step 10.
8. Replace side impact air bag module. See «AIR BAG MODULES»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 11.
9. Replace side impact air bag module wiring harness. Go to step 11.
10. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
11. Reconnect all SIR components. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If current DTC is retrieved by scan tool, go to step 2. If current DTC is not retrieved by scan tool, system is normal.

Sensing and Diagnostic Module (SDM) contains a sensing device which converts vehicle velocity changes to an electrical signal. SDM processes electrical signals and compares them to values stored in memory. When signals exceed stored value, additional signal processing is performed and signals are compared to values stored in memory. When 2 signals exceed stored values, SDM causes current to flow through air bag modules, deploying air bag modules and causing DTC B1051 to set.

DTC sets when SDM (SDM) detects an impact of sufficient force to deploy air bags.

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

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

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Turn ignition off. If air bags have deployed, go to step 5 . If air bags have not deployed, go to next step.
3. Inspect vehicle and undercarriage for signs of impact. If impact has occurred, go to step 5 . If no impact has occurred, go to next step.
4. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 6 .
5. Replace components and perform inspections as required following an accident. See «POST-COLLISION INSPECTION»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__post-collision-inspection) . Go to next step.
6. Reconnect all SIR components. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .

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

DTC will set when SDM detects an impact of sufficient force to deploy air bags and a deployment loop malfunction exists.

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

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

DTC B0053 will be accompanied by at least one other DTC. Repair malfunction causing other DTC's before installing new SDM.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Turn ignition off. If air bag modules have not deployed, go to next step. If air bag modules have deployed, go to step 5 .
3. Inspect vehicle and undercarriage for signs of impact. If no impact has occurred, go to next step. If impact has occurred, go to step 5 .
4. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 6 .
5. Replace components and perform inspections as required following an accident. See «POST-COLLISION INSPECTION»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__post-collision-inspection) . Go to next step.
6. Reconnect all SIR components. Go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .

Side Impact Sensor (SIS) uses a unidirectional 2-wire circuit. SIS modulates current on the interface to send identification, State Of Health (SOH) and deployment commands to Sensing and Diagnostic Module (SDM). SDM provides power and ground to Side Impact Sensor (SIS). When ignition is turned on and power from SDM is detected by SIS, SIS performs internal diagnostics, then sends an identification message to SDM. SDM receives identification message within 5 seconds of power being turned on and determines if message is valid. SIS continually communicates a status message to SDM. When a fault is detected, SDM resets SIS twice by removing and reapplying power to SIS. If fault is still present, SDM will set DTC.

DTC B0077 will set when SDM does not receive a valid identification message within 5 seconds of driver-side SIS being powered up, status message is not received or SDM has reset SIS twice without detecting valid identification message. DTC B0078 will set when SDM does not receive a valid identification message within 5 seconds of passenger-side SIS being powered up, status message is not received or SDM has reset SIS twice without detecting valid identification message.

DTC B0079 will set when SDM receives an identification message from driver-side SIS that does not match identification stored in memory or after SDM has tried twice to reset SIS without detecting correct identification message. DTC B0081 will set when SDM receives an identification message from passenger-side SIS that does not match identification stored in memory or after SDM has tried twice to reset SIS without detecting correct identification message.

DTC B0080 will set when SDM has received a Not Okay (NOK) message from driver-side SIS. DTC B0082 will set when SDM has received a Not Okay (NOK) message from passenger-side SIS.

SDM attempts to reset SIS, turns on AIR BAG warning light and sets DTC.

DTC will clear when condition responsible for setting DTC no longer exists and CLEAR DTC command is issued via scan tool. History DTC will clear once 255 malfunction free ignition cycles have occurred.

Condition could be caused by a short to ground or voltage, high or low resistance in circuits 2161, 2162, 2163 or 2164. A short between circuits 2161 and 2162 or 2163 and 2164 could also cause condition.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Using scan tool, request SIR DTC display. If DTC B0079, B0080, B0081 or B0082 is retrieved as a current DTC, go to step 12. If DTC B0079, B0080, B0081 or B0082 is not retrieved as a current DTC, go to next step.
3. Turn ignition off. If DTC B0077 is current, disconnect driver-side SIS connector. See «SIDE IMPACT SENSOR (SIS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. If DTC B0078 is current, disconnect passenger-side SIS connector. If connector is damaged or corroded, go to next step. If connector is okay, go to step 5.
4. If SIS side of connector is damaged, replace SIS. Go to step 13. If harness side of connector is damaged, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 13. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
5. Disconnect SDM connector. (Scheme 96) If SDM connector show signs of corrosion, poor connections or other damage, replace SDM connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 13. If SDM connector is okay, go to next step.
6. If DTC B0077 is current, disconnect driver-side SIS connector. If DTC B0078 is current, disconnect passenger-side SIS connector. Test applicable SIS signal circuit for a short to ground, an open or high resistance. If a short to ground or an open or high resistance is found and corrected, go to step 13. If a short to ground, an open or high resistance is not found, go to next step.
7. Inspect applicable SIS voltage circuit for a short to ground, an open or a high resistance. If a short to voltage is found and corrected, go to step 13. If short is not found, go to next step.
8. Turn ignition on. Check applicable SIS signal and voltage circuits for a short to voltage. If short to voltage is found and corrected, go to step 13. If short to voltage is not found, go to next step.
9. If DTC B0077 was displayed by scan tool, replace driver-side SIS. Go to next step. If DTC B0078 was displayed by scan tool, replace passenger-side SIS. Go to next step.
10. Reconnect all SIR components. Using scan tool, clear DTC's. Road test vehicle, then check for DTC's. If DTC's are retrieved by scan tool, go to next step. If DTC's are not retrieved by scan tool, system is normal.
11. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 13.
12. If DTC B0079 or B0080 were retrieved by scan tool, replace driver-side SIS. Go to next step. If DTC B0081 or B0082 were retrieved by scan tool, replace passenger-side SIS. Go to next step.
13. Reconnect all SIR components. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to step 2. If DTC's are not retrieved, system is normal.

Seat Position Switch (SPS) is used to determine driver or front passenger seat position. SPS interfaces with Sensing and Diagnostic Module (SDM). State of SPS allows SDM to disable Stage 2 deployment of applicable air bag module. SPS is a Hall effect sensor mounted on seat tracks. Shunted state of SPS represents rearward seat position, while non-shunted state represents a forward seat position. SPS is secondary to passenger-side air bag module disable switch and Passenger Presence System (PPS). If either device is in disable mode, passenger-side air bag module will not deploy regardless of SPS status.

DTC sets when SDM detects SPS circuit amperage is 4 milliamps or less for 500 milliamps, when circuit amperage is 18 milliamps or more for 500 milliseconds or when circuit amperage is between 8 milliamps and 11 milliamps for 500 milliseconds.

SDM defaults SPS to forward threshold, sets DTC and turns on AIR BAG warning light.

Current DTC clears when condition responsible for DTC no longer exists and CLEAR CODES command is issued via scan tool. History DTC clears when 255 malfunction free ignition cycles have occurred.

Condition could be caused by a short between circuits 1363 and 5055 or 1363 and 5056. An open or high resistance in any circuit could also cause condition.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Turn ignition off. If DTC B0083 is present, disconnect passenger SPS connector, located on front passenger seat outboard seat track. If DTC B0084 is present, disconnect driver SPS connector, located on driver seat outboard seat track. Inspect both sides of applicable connector for corrosion, poor connections or damage. If either half of connector is damaged, go to next step. If both halves of connector are okay, go to step 4.
3. If SPS terminals are damaged, replace applicable SPS. See «SEAT POSITION SWITCH (SPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to step 12. If harness side of connector shows signs of corrosion, poor connections or damage, replace applicable connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 12.
4. If DTC B0083 is present, disconnect right main seat harness connector, located under passenger front seat. If DTC B0084 is present, disconnect left main seat harness connector, located under driver seat. If either half of connector shows signs of damage, poor connections or corrosion, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 12. If both halves of connector are okay, go to next step.
5. Disconnect SDM connector. (Scheme 96) If SDM connector shows signs of corrosion, poor connections or damage, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 12. If connector is okay, go to next step. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
6. If DTC B0083 is current, test circuit 5056 for a short to ground, high resistance or an open. If condition is found and corrected, go to step 12. If condition is not found, go to next step. If DTC B0084 is current, test circuit 5055 for a short to ground, high resistance or an open. If condition is found and corrected, go to step 12. If condition is not found, go to next step.
7. If DTC B0083 is current, test right low reference circuit 1363 for a short to ground, high resistance or an open. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). If condition is found and corrected, go to step 12. If condition is not found, go to next step. If DTC B0084 is current, test left low reference circuit 1363 for a short to ground, high resistance or an open. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). If condition is found and corrected, go to step 12. If condition is not found, go to next step.
8. Turn ignition on. If DTC B0083 is current, test circuits 1363 and 5056 for a short to voltage. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). If condition is found and corrected, go to step 12. If condition is not found, go to next step. If DTC B0084 is current, test circuits 1363 and 5055 for a short to voltage. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). If condition is found and corrected, go to step 12. If condition is not found, go to next step.
9. For DTC B0083, replace passenger SPS. See «SEAT POSITION SWITCH (SPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step. For DTC B0084, replace driver SPS. Go to next step.
10. Reconnect all SIR components. Using scan tool, clear all DTC's. Road test vehicle. If DTC resets, go to next step. If DTC does not reset, system is normal.
11. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
12. Reconnect all SIR components. Ensure all components are properly mounted. Using scan tool, clear all SIR DTC's. Road test vehicle. If DTC resets, go to step 2. If DTC does not reset, system is normal.

When ignition is turned on, Sensing and Diagnostic Module (SDM) performs tests to diagnose critical internal malfunctions. When SDM has completed power-up mode, SDM will establish communication with Passenger Presence System (PPS). PPS will respond by commanding both PASSENGER AIR BAG ON and OFF indicators, located in rear view mirror, on for 5 seconds. SDM will transmit a request message to PPS to receive PPS verification identification. PPS will transmit verification identification to SDM and SDM will compare identification received to data stored in memory. SDM will also set DTC B0092 to notify driver that PPS has a current malfunction. When SDM determines that PPS has set DTC 023, 024, 063, 064 or 065, SDM will disable passenger-side air bag module deployment loop, set DTC B0092 and turn AIR BAG warning light on.

SDM disables passenger-side air bag module deployment loop and turns on AIR BAG warning light.

Current DTC clears when condition responsible for DTC no longer exists and CLEAR CODES command is issued via scan tool. History DTC clears when 255 malfunction free ignition cycles have occurred.

DTC B0092 is an indication that SDM has received an incorrect PPS verification identification or has lost communication with PPS. If SDM does not receive correct verification identification from PPS within 5 seconds, SDM will set the DTC as current, turn on AIR BAG warning light and disable passenger-side air bag module deployment loop. DTC will set if PPS has a current malfunction and has set DTC 023, 024, 033, 063, 064 or 065.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Install scan tool to Data Link Connector (DLC), located under left side of instrument panel. Turn ignition on. Using scan tool, request PPS to flash DTC's. See «PASSENGER PRESENCE FLASH CODE PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system). If PPS flashes any current or history DTC's, diagnose displayed DTC's. See «DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) table. If PPS does not display any DTC's, go to next step.
3. Turn ignition off. Disconnect PPS ECU connector. If PPS ECU connector shows signs of corrosion or damage, replace PPS ECU connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 10. If PPS ECU connector is okay, go to next step.
4. Disconnect main seat harness connector, located under passenger front seat. If main seat harness connector shows signs of corrosion, poor connections or damage, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 10. If main seat harness connector is okay, go to next step. NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
5. Inspect Black wire between PPS connector terminal No. 5 and ground for an open or high resistance. (Scheme 107) If an open or high resistance is found and corrected in circuit 2351, go to step 10. If an open or high resistance is not found, go to next step.
6. Inspect Yellow wire between PPS connector terminal No. 9 and SIR fuse, located in underhood fuse block, for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found and corrected in circuit 1139, go to step 10. If a short to ground, an open or high resistance is not found, go to next step.
7. Reconnect main seat harness connector. Turn ignition on. Inspect circuit 2351 for a short to voltage. If a short to voltage is found and corrected, go to step 10. If a short to voltage is not found, go to next step.
8. Inspect Pink wire between PPS connector terminal No. 18 and SDM connector terminal No. 2 for a short to ground, an open or a high resistance. (Scheme 99) If a short to ground, an open or high resistance is found and corrected, go to step 10. If a short to ground, an open or high resistance is not found, go to next step.
9. Replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to next step.
10. Reconnect all SIR and PPS components. Verify all components and connectors and properly installed. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Road test vehicle. If DTC resets, go to step 2. If DTC does not reset, system is normal.

When ignition is turned on, Sensing and Diagnostic Module (SDM) performs tests to diagnose critical internal malfunctions. When SDM has completed power-up mode, SDM will establish communication with Passenger Presence System (PPS). PPS will respond by commanding both PASSENGER AIR BAG ON and OFF indicators, located in rear view mirror, on for 5 seconds. SDM will transmit a request message to PPS to receive PPS verification identification. PPS will transmit verification identification to SDM and SDM will compare identification received to data stored in memory. If data does not match, SDM will set DTC B0098 and turn AIR BAG warning light on. PPS will set DTC 065 and request SDM to disable passenger-side air bag module deployment loop.

SDM sets DTC, turns on AIR BAG warning light and disables passenger-side air bag module deployment loop.

Current DTC clears when condition responsible for DTC no longer exists and CLEAR CODES command is issued via scan tool. History DTC clears when 255 malfunction free ignition cycles have occurred.

DTC B0098 is an indication that SDM has received an incorrect PPS verification identification. SDM will continue to request verification identification from PPS for 5 seconds. If SDM does not receive correct verification identification from PPS within 5 seconds, SDM will set DTC B0098 as a current DTC, turn on AIR BAG warning light and disable passenger-side air bag module deployment loop. If SDM or PPS were replaced, make sure correct part numbers were used for vehicle application. DTC B0098 will also set if PPS has a current malfunction and has set DTC 065.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
2. If PPS was replaced, go to next step. If PPS was not replaced, go to step 4 .
3. Inspect PPS and verify correct PPS was installed using PPS part number. If PPS is correct, go to next step. If PPS is not correct, go to step 6 .
4. If SDM was replaced, go to next step. If SDM was not replaced, go to step 6 . NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
5. Inspect SDM and verify correct SDM was installed using SDM part number. If SDM is correct, go to next step. If SDM is not correct, go to step 8 .
6. Replace PPS. See «PASSENGER PRESENCE SYSTEM (PPS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-pps) under REMOVAL & INSTALLATION. Go to next step.
7. Reconnect all SIR and PPS components. Verify all components and connectors are installed correctly. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Road test vehicle. If DTC resets, go to next step. If DTC does not reset, system is normal.
8. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
9. Reconnect all SIR and PPS components. Verify all components and connectors are installed correctly. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See «PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__passenger-presence-system-rezeroing-procedure) under DIAGNOSTICS. Road test vehicle. If DTC resets, go to step 2 . If DTC does not reset, system is normal.

Electronic Frontal Sensor (EFS), uses a unidirectional 2-wire circuit. EFS sensor modulates current on the interface to send identification, State Of Health (SOH) and deployment commands to Sensing and Diagnostic Module (SDM). SDM serves as a power source and ground for EFS. When ignition is turned on and EFS detects power from SDM, EFS responds by performing internal diagnostics and sending identification to SDM. SDM considers identification message to be valid if received within 5 seconds of EFS powering up. EFS continually communicates a status message to SDM. When fault is detected, SDM will attempt to reset EFS twice by removing and applying power. If fault is still present, SDM will set a DTC.

DTC B0100 sets when SDM does not receive a valid identification message from driver-side EFS within 5 seconds of being powered up, when a status message is not received or when SDM has tried twice to reset EFS. DTC B0103 sets when SDM does not receive a valid identification message from passenger-side EFS within 5 seconds of being powered up, when a status message is not received or when SDM has tried twice to reset EFS.

DTC B0101 sets when SDM has received 4 consecutive NOK (Not Okay) messages from driver-side EFS. DTC B0104 sets when SDM has received 4 consecutive NOK (Not Okay) messages from passenger-side EFS.

DTC B0102 will set when SDM has received an identification message from driver-side EFS which does not match identification message stored in SDM and SDM has tried twice to reset EFS. DTC B0105 will set when SDM has received an identification message from passenger-side EFS which does not match identification message stored in SDM and SDM has tried twice to reset EFS.

SDM turns on AIR BAG warning light and sets DTC.

DTC will clear when condition responsible for setting DTC no longer exists and CLEAR DTC command is issued via scan tool. History DTC will clear once 255 malfunction free ignition cycles have occurred.

Condition could be caused by short between circuits 349 and 354 or 1409 and 1834. An incorrect EFS or an open or high resistance in any circuit could also cause condition.

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

1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system).
2. Using scan tool, request SIR DTC display. If DTC B0101, B0102 B0104 or B0105 is current, go to step 12. If DTC B0101, B0102, B0104 or B0105 is not current, go to next step.
3. Turn ignition off. If DTC B0100 is current, disconnect driver-side EFS connector. See «ELECTRONIC FRONTAL SENSOR (EFS)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. If DTC B0103 is current, disconnect passenger-side EFS connector. If applicable EFS connector shows signs of damage or corrosion, go to next step. If connector is okay, go to step 5.
4. If component side of connector is damaged, replace EFS. Go to step 13. If harness side of connector is damaged, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 13.
5. Disconnect SDM connector. (Scheme 96) If SDM connector shows signs of damage or corrosion, replace connector. See «WIRE REPAIR»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system__wire-repair). Go to step 13. If SDM terminals show signs of damage or corrosion, go to step 11. If SDM connector and terminals are okay, go to next step.
6. If DTC B0100 is current, test driver-side EFS signal circuit for a short to ground, high resistance or an open circuit. If DTC B0103 is current, test passenger-side EFS signal circuit for a short to ground, high resistance or an open circuit. If a short to ground, an open or high resistance is found and corrected, go to step 13. If a short to ground, an open or high resistance is not found, go to next step.
7. If DTC B0100 is current, test driver-side EFS reference circuit for a short to ground, high resistance or an open circuit. If DTC B0103 is current, test passenger-side EFS reference circuit for a short to ground, a high resistance or an open circuit. If a short to ground, an open or high resistance is found and corrected, go to step 13. If a short to ground, an open or high resistance is not found, go to next step.
8. Turn ignition on. Check for a short to voltage in applicable EFS circuits. If a short to voltage is found and corrected, go to step 13. If a short to voltage is not found, go to next step.
9. If DTC B0100 was retrieved, replace driver-side EFS. Go to next step. If DTC B0103 was retrieved, replace passenger-side EFS. Go to next step.
10. Reconnect all SIR components. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to next step. If DTC's are not retrieved, system is normal.
11. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
12. For DTC B0101 and B0102, replace driver-side EFS. Go to next step. For DTC B0104 and B0105, replace passenger-side EFS. Go to next step.
13. Reconnect all SIR components. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to step 2. If DTC's are not retrieved, system is normal.

DTC B1000 indicates an internal SDM malfunction. No external circuits are involved.

DTC sets when SDM detects an internal malfunction.

SDM refuses all additional inputs.

Current DTC clears when malfunction is no longer present. History DTC clears when SDM ignition cycle counter reaches the reset threshold, without a repeat of malfunction.

DTC may be stored as history DTC without affecting operation of SDM. If DTC is retrieved only as a history DTC and not as a current DTC, DO NOT replace SDM. If DTC is retrieved as a history and current DTC, replace SDM.

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

1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Using scan tool, request SIR DTC display. If DTC B1000 is retrieved as a current DTC, go to next step. If DTC B1000 is retrieved as a history DTC, go to «DIAGNOSTIC AIDS»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
3. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Reconnect all SIR components. Go to next step.
4. Using scan tool, erase DTC's. Road test vehicle, then check for DTC's. IF DTC B1000 is retrieved by scan tool, go to step 2 . If DTC B1000 is not retrieved, system is normal.

When ignition is turned on, Sensing and Diagnostic Module (SDM) compares restraints identification stored in SDM to restraints identification stored in Body Control Module (BCM). SDM will then compare Vehicle Identification Number (VIN) stored in SDM to VIN stored in Powertrain Control Module (PCM).

DTC sets when restraints identification stored in SDM does not match restraints identification stored in BCM or when VIN stored in SDM does not match VIN stored in BCM.

SDM sets DTC, turns on AIR BAG warning light and disables air bag module deployment loops.

Current DTC clears when condition responsible for setting DTC no longer exists and a CLEAR DTC's command is issued via scan tool. History DTC will clear once 255 malfunction-free ignition cycles have occurred.

DTC is an indication that restraints identification stored in BCM and SDM DO NOT match or that VIN stored in PCM and SDM DO NOT match. If PCM or BCM were replaced, modules will need to be reprogrammed. If BCM or SDM were replaced, Vehicle Theft Deterrent (VTD) system will need to be reprogrammed.

1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to «SIR DIAGNOSTIC SYSTEM CHECK»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Using scan tool, verify that PCM is programmed with correct VIN. If VIN is not correct, go to next step. If VIN is correct, go to step 4 .
3. Using scan tool, program correct VIN into PCM. Go to step 9 .
4. If BCM was not replaced, go to next step. If BCM was replaced, go to step 8 .
5. Using scan tool, program BCM to learn restraints identification from SDM. When programming is complete, go to step 9 . If VIN is not correct, go to next step.
6. If SDM was not replaced, go to next step. If SDM was replaced, go to step 8 .
7. Replace SDM. See «SENSING & DIAGNOSTIC MODULE (SDM)»(/cadillac/escalade/gmt800-2001-2006/remont/airbag/#supplemental-inflatable-restraint-system) under REMOVAL & INSTALLATION. Go to next step.
8. Using scan tool, reprogram VTD system. Go to next step.
9. Reconnect all SIR components. Using scan tool, clear DTC's. Road test vehicle, then check for DTC's. If DTC is retrieved, go to step 2 . If DTC is not retrieved, system is normal.

WIRE REPAIR

SIR system requires special wiring repair procedures due to sensitive nature of circuitry. Wire Repair Kit (J-38125-B) 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 connector are damaged, SDM connector must be replaced using SDM connector pigtail assembly or SDM 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

Air Bag System Wiring Diagram (Avalanche, Escalade, Suburban, Tahoe, Yukon-1 Of 2). Scheme 108

Air Bag System Wiring Diagram (Avalanche, Escalade, Suburban, Tahoe, Yukon-2 Of 2). Scheme 109

See also:
• AIR BAG/SRS COMPONENT INSPECTION & REPLACEMENT TABLES
• AIR BAG SAFETY PRECAUTIONS
• DISABLING & ACTIVATING AIR BAG SYSTEM
• SYSTEM OPERATION CHECK
• DISPOSAL PROCEDURES
• REMOVAL & INSTALLATION
• ON-VEHICLE DEPLOYMENT
• OFF-VEHICLE DEPLOYMENT
• WIRING DIAGRAMS
• ZONE 3
• ZONE 5
• TORQUE SPECIFICATIONS
• ZONE 7
• ZONE 9
• ZONE 1
• PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE
• COMPASS CALIBRATION & COMPASS MAGNETIC VARIATION ADJUSTMENT
• ZONE 2
• ZONE 6
• COMPASS MAGNETIC VARIATION ADJUSTMENT
• COMPASS CALIBRATION
• WIRE REPAIR
• PASSENGER PRESENCE SYSTEM (PPS)
• SIR COIL ASSEMBLY
• POST-COLLISION INSPECTION