Supplemental Inflatable Restraint System Cadillac Escalade GMT900

Fastener Tightening Specifications

Scheme 1

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Scheme 3

Scheme 4

Scheme 5

SIR Identification Views

The SIR Identification Views shown below illustrate the approximate location of all SIR components available for the vehicle. This will assist in disabling and enabling the SIR system, refer to SIR Disabling and Enabling .

Scheme 6

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

If a malfunction is detected, a DTC will be stored in non-volatile memory. During a frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop in order to deploy the driver steering wheel air bag. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage.

There are 2 shorting bars used within each connector which will short together both driver steering wheel air bag stage 1 high circuit and driver steering wheel air bag stage 1 low circuit and both driver steering wheel air bag stage 2 high circuit and driver steering wheel air bag stage 2 low circuit when the connector is disconnected. This will help to prevent unwanted deployment of the air bag during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

B0012 01 Stage 1 or B0013 01 Stage 2

The driver steering wheel air bag high and/or low circuit is shorted to voltage for 120 milliseconds.

B0012 02 Stage 1 or B0013 02 Stage 2

The driver steering wheel air bag high and/or low circuit is shorted to ground for 120 milliseconds.

B0012 04 Stage 1 or B0013 04 Stage 2

The driver steering wheel air bag high and/or low circuit is open for 120 milliseconds.

B0012 0D Stage 1 or B0013 0D Stage 2

The driver steering wheel air bag deployment loop resistance is greater than 5.1 ohms for 120 milliseconds.

B0012 0E Stage 1 or B0013 0E Stage 2

The driver steering wheel air bag deployment loop resistance is less than 1.3 ohms for 120 milliseconds.

Action Taken When the DTC Sets

1. The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
2. The SDM will store a DTC, however if an event occurs the system will still attempt deployments.

Conditions for Clearing the DTC

1. The condition for setting the DTC no longer exists.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Diagnostic Aids

1. When a harness connector is disconnected, the high control and low control circuits are shorted together by the integral shorting bar. This should be taken into account when testing for faults on these circuits.
2. This DTC usually indicates a poor connection or a wiring malfunction between the SDM and the deployment loop.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 38715-A SIR Driver/Passenger Load Tool. See Special Tools .

Circuit/System Testing

1. Verify that the driver steering wheel air bag connector and CPA are engaged. If the above condition is not found, make the appropriate repair.
2. Ignition OFF, disconnect the harness connector at the driver steering wheel air bag.
3. With the appropriate load tool adaptor, connect J 38715-A in place of the driver steering wheel air bag. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
4. Ignition ON, with a scan tool, verify the appropriate DTC is set as current. If the DTC is not set or is set as history, cycle ignition OFF, disconnect the adapter and J 38715-A , reconnect the harness connector at the driver steering wheel air bag, and cycle the ignition ON. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) . If the DTC resets after reconnecting the air bag, then replace the driver steering wheel air bag.
5. Ignition OFF, disconnect J 38715-A and the adaptor. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
6. Disconnect the driver steering wheel air bag coil in-line connector.
7. With the appropriate load tool adaptor, connect special tool J 38715-A . See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
8. Ignition ON, with a scan tool, verify DTC is set as current. If DTC is not set or is set as history, replace the driver steering wheel air bag coil.
9. Ignition OFF, disconnect special tool J 38715-A and the adaptor. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
10. Disconnect the harness connector at the SDM.
11. Ignition ON, test for less than 1 volt between the high circuit terminals listed below and ground. Driver steering wheel air bag coil connector Stage 1 terminal A X1 Driver steering wheel air bag coil connector Stage 2 terminal A X2 If greater than the specified range, test the circuit for a short to voltage.
12. Test for less than 1 volt between the low circuit terminals listed below and ground. Driver steering wheel air bag coil connector Stage 1 terminal B X1 Driver steering wheel air bag coil connector Stage 2 terminal B X2 If greater than the specified range, test the circuit for a short to voltage.
13. Ignition OFF, test for infinite resistance between the high circuit terminals listed below and ground. Driver steering wheel air bag coil connector Stage 1 terminal A X1 Driver steering wheel air bag coil connector Stage 2 terminal A X2 If less than the specified value, test the circuit for a short to ground.
14. Test for infinite resistance between the low circuit terminals listed below and ground. Driver steering wheel air bag coil connector Stage 1 terminal B X1 Driver steering wheel air bag coil connector Stage 2 terminal B X2 If less than the specified value, test the circuit for a short to ground.
15. Test for less then 1 ohm between the SDM connector and the air bag connector high circuit terminals listed below. Driver steering wheel air bag coil connector Stage 1 terminal A X1 and SDM terminal 4 X1. Driver steering wheel air bag coil connector Stage 2 terminal A X2 and SDM terminal 1 X1. If greater than the specified range, test the circuit for an open/high resistance.
16. Test for less then 1 ohm between the SDM connector and the air bag connector low circuit terminals listed below. Driver steering wheel air bag coil connector Stage 1 terminal B X1 and SDM terminal 3 X1 Driver steering wheel air bag coil connector Stage 2 terminal B X2 and SDM terminal 2 X1 If greater than the specified range, test the circuit for an open/high resistance.
17. If all circuits test normal, replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Wheel Inflatable Restraint Module Coil Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
2. «Steering Wheel Inflatable Restraint Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
3. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

During a side or frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the deployment loop in order to deploy the air bag module. There are 2 shorting bars used within the module connector which will short together both high and low circuits, when the connector is disconnected. This will prevent unwanted deployment of the inflator module during servicing.

Ignition voltage is between 9-16 V.

B0014 01, B0015 01, B0016 01, B0019 01, B0020 01, B0021 01, B0022 01, B0023 01

The air bag or seat belt retractor pretensioner high and/or low control circuit is shorted to voltage for 120 milliseconds.

B0014 02, B0015 02, B0016 02, B0019 02, B0020 02, B0021 02, B0022 02, B0023 02

The air bag or seat belt retractor pretensioner high and/or low control circuit is shorted to ground for 120 milliseconds.

B0014 04, B0015 04, B0016 04, B0019 04, B0020 04, B0021 04, B0022 04, B0023 04

The air bag or seat belt retractor pretensioner high and/or low control circuit is open for 120 milliseconds.

B0014 0D, B0015 0D, B0016 0D, B0019 0D, B0020 0D, B0021 0D, B0022 0D, B0023 0D

The air bag or seat belt retractor pretensioner deployment loop resistance is greater than 3.9 ohms for 120 milliseconds.

B0014 0E, B0015 0E, B0016 0E, B0019 0E, B0020 0E, B0021 0E, B0022 0E, B0023 0E

The air bag or seat belt retractor pretensioner deployment loop resistance is less than 1.1 ohms for 120 milliseconds.

1. The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
2. The SDM will store a DTC, however if an event occurs the system will still attempt deployments.

1. The condition for setting the DTC no longer exists.
2. A history DTC will clear once 100 fault-free ignition cycles have occurred.

1. When a harness connector is disconnected, the high control and low control circuits are shorted together by the integral shorting bar. This should be taken into account when testing for faults on these circuits.
2. This DTC usually indicates a poor connection or a wiring malfunction between the SDM and the deployment loop.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools Required

J 38715-A Driver and Passenger SIR Load Tool. See Special Tools .

Circuit/System Verification

Note. Refer to SIR Service Precautions Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector. Seat belt pretensioner Passenger instrument panel airbag Side air bag Roof rail airbag SDM SDM wiring harness connector

Note. The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.

Observe the scan tool Deployment Loop Resistance parameters while moving the harness near each connector listed below. The reading should stay consistently between 1.7 and 4.2 ohms without any drop outs or spikes.

1. Passenger instrument panel air bag
2. Roof rail air bag
3. Seat side air bag
4. Seat belt pretensioner
5. Any inline harness
6. SDM

1. If the reading is erratic while moving the harness, perform the following

1. Inspect each connector terminal for damage or corrosion and repair as necessary.
2. Apply Nyogel lubricant 760G to each connector terminal.
3. Insure each connector and CPA is correctly seated.

DTC B0014-B0018 or B0021-B0045

1. Ignition OFF, disconnect the scan tool and disconnect the harness connector at the appropriate air bag or seat belt retractor pretensioner.
2. With the appropriate load tool adaptor, connect special tool J 38715-A in place of the air bag or seat belt retractor pretensioner. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
3. Wait for 120 seconds and then test for greater than 25 ohms between the control circuit terminals listed below. Left roof rail air bag terminal 1 and 2 Right roof rail air bag terminal 1 and 2 Driver seat side air bag terminal 1 and 2 Passenger seat side air bag terminal 1 and 2 Driver seat belt retractor pretensioner terminal 1 and 2 Passenger seat belt retractor pretensioner terminal 1 and 2 If less than the specified range, test for a short between the control circuits, check each connector and CPA to ensure that the shorting bars are lifted. If the circuits and shorting bars tests normal, replace the SDM.
4. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground: Roof rail air bag control circuit terminal 1 Roof rail air bag control circuit terminal 2 Seat side air bag control circuit terminal 1 Seat side air bag control circuit terminal 2 Retractor pretensioner control circuit terminal 1 Retractor pretensioner control circuit terminal 2 If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the SDM.
5. Ignition OFF, test for greater than 25 ohms between the control circuit terminals listed below and ground: Roof rail air bag control circuit terminal 1 Roof rail air bag control circuit terminal 2 Seat side air bag control circuit terminal 1 Seat side air bag control circuit terminal 2 Retractor pretensioner control circuit terminal 1 Retractor pretensioner control circuit terminal 2 If less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the SDM.
6. Install a 3 A fused jumper wire between the control circuit terminals listed below. Left roof rail airbag terminal 1 and 2 Right roof rail airbag terminal 1 and 2 Driver seat side airbag terminal 1 and 2 Passenger seat side airbag terminal 1 and 2 Driver seat belt retractor pretensioner terminal 1 and 2 Passenger seat belt retractor pretensioner terminal 1 and 2
7. Verify the scan tool Deployment Loop Resistance parameter is less than 2 ohms. If greater than the specified range, test both control circuits terminals for an open/high resistance. If the circuits test normal, replace the SDM.
8. If all circuits test normal, replace the roof rail air bag, seat side air bag, or seat belt pretensioner.

DTC B0019-B0020

1. Ignition OFF, disconnect the scan tool and disconnect harness connector X200.
2. Wait for 120 seconds and then test for greater than 25 ohms between the appropriate control circuit terminals listed below on the SDM side of the connector: Passenger instrument panel airbag stage 1 terminal 5 and 6 X1 Passenger instrument panel airbag stage 2 terminal 8 and 7 X1 If less than the specified range, test for a short between the control circuits, check each connector and CPA to ensure that the shorting bars are lifted. If the circuits and shorting bars tests normal, replace the SDM.
3. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground on the SDM side of the connector: Control circuit terminal 5 X1 Control circuit terminal 6 X1 Control circuit terminal 8 X1 Control circuit terminal 7 X1 If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the SDM.
4. Ignition OFF, test for greater than 25 ohms between the control circuit terminals listed below and ground on the SDM side of the connector: Control circuit terminal 5 X1 Control circuit terminal 6 X1 Control circuit terminal 7 X1 Control circuit terminal 8 X1 If less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the SDM.
5. Install a 3 A fused jumper wire between the control circuit terminals listed below. Passenger instrument panel airbag stage 1 terminal 5 and 6 X1 Passenger instrument panel airbag stage 2 terminal 8 and 7 X1
6. Verify the scan tool Deployment Loop Resistance parameter is less than 2 ohms. If greater than the specified range, test both control circuits terminals for an open/high resistance. If the circuits test normal, replace the SDM.
7. Disconnect the passenger instrument panel air bag harness connector.
8. With the appropriate load tool adaptor, connect special tool J 38715-A in place of the air bag. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
9. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground: Control circuit terminal A1 Control circuit terminal A2 Control circuit terminal B1 Control circuit terminal B2 If greater than the specified range, test the control circuit for a short to voltage.
10. Ignition OFF, test for greater than 25 ohms between the control circuit terminals listed below and ground: Control circuit terminal A1 Control circuit terminal A2 Control circuit terminal B1 Control circuit terminal B2 If less than the specified range, test the control circuit for a short to ground.
11. Ignition OFF, test for less than 5 ohms between the control circuit terminals listed below: X200 control circuit terminal A1 and passenger instrument panel air bag harness connector control circuit terminal A1 X200 control circuit terminal A2 and passenger instrument panel air bag harness connector control circuit terminal A2 X200 control circuit terminal B1 and passenger instrument panel air bag harness connector control circuit terminal B1 X200 control circuit terminal B2 andpassenger instrument panel air bag harness connector control circuit terminal B2 If greater than the specified range, test the control circuit for an open/high resistance.
12. If all circuits test normal, replace the passenger instrument panel air bag.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
2. «Instrument Panel Inflatable Restraint Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
3. «Steering Wheel Inflatable Restraint Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
4. «Steering Wheel Inflatable Restraint Module Coil Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
5. «Inflatable Restraint Side Impact Sensor Replacement (Front Side Door)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Inflatable Restraint Side Impact Sensor Replacement (Rear Side Door)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
6. «Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Avalanche/Escalade EXT)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Left, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Right, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Left, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Avalanche/Escalade EXT)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Right, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
7. «Seat Belt Retractor Pretensioner Replacement - Front»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
8. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The inflatable restraint sensing and diagnostic module (SDM) contains a device that converts vehicle velocity changes into an electrical signal. The SDM compares this electrical signal to a value stored in memory. When the generated signal exceeds the stored value, the SDM performs additional signal processing and compares the generated signals to values stored in memory. When 2 of the generated signals exceed the stored values, the SDM will cause current to flow through the deployment loops, deploying the air bags and/or pretensioners causing DTC B0052 to set.

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0052

1. The SDM detects a frontal impact of sufficient force to warrant deployment of the frontal modules.
2. The SDM detects a side impact of sufficient force to warrant deployment of a side impact module and/or roof rail module.
3. The SDM has deployed the seat belt pretensioner for 3 separate deployments.

1. The SDM requests the instrument panel cluster (IPC) to illuminate the Service Air Bag indicator.
2. The SDM records crash data.

After an air bag deployment or 3 separate pretensioner deployments the DTC becomes latched and cannot be cleared.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, verify no signs of inflator module or pretensioner deployment exist. If any signs of deployment exist, refer to «Repairs and Inspections Required After a Collision»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Verify DTC B0052 is not set. If DTC B0052 is set, clear DTCs. If the DTC sets, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Control Module References for SDM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The inflatable restraint seat belt tension sensor is a 3-wire potentiometer mounted on the buckle side of the passenger seat belt and provides an input to the passenger presence system (PPS). When an infant car seat is properly restrained on the front passenger seat, the seat belt is tightly secured through the car seat. The seat belt pulls on the tension sensor and changes the voltage signal to the PPS module. The PPS monitors the belt tension sensor signal circuit and if a fault is detected, DTC will be set. When the PPS detects this DTC it will send out a serial data message and the SDM will notify the customer of the enable/disable status by illuminating the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. The SDM will then suppress the deployment of the instrument panel (I/P) module and illuminate the AIR BAG indicator.

Ignition voltage is between 9-16 volts.

1. The PPS detects the voltage at the belt tension sensor signal circuit is less than 0.5 volt or greater than 4.5 volts for 1 second.
2. The PPS detects the voltage at the belt tension sensor voltage reference circuit is less than 4.5 volts or greater than 9.1 volts for 1 second.
3. The PPS detects the amperage at the belt tension sensor low reference circuit is 25 MA or greater for 1 second.

1. The PPS will set a DTC, and then communicate with the SDM.
2. The SDM will set DTC B0081 0F.
3. The SDM disables the Passenger Airbag Module.
4. The PPS will illuminate the Passenger Airbag status OFF indicator.
5. The SDM requests the instrument panel cluster (IPC) to illuminate the AIRBAG indicator.

1. The condition for setting the DTC no longer exists.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Inspect the passenger seat belt tension sensor signal, voltage reference, and low reference circuits carefully for cutting and/or chafing.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the passenger seat belt tension sensor and inspect the component and harness sides for damage or corrosion. If damage or corrosion is found, repair or replace as necessary.
2. Ignition ON, test for 4.5-5.5 volts between the passenger seat belt tension sensor voltage reference circuit terminal A X2 and ground. If less that the specified range, test the voltage reference circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the PPS module. If greater that the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the PPS module.
3. Ignition OFF, remove the AIR BAG BATT Fuse in the underhood fuse block. Test for less than 2.0 ohms between the passenger seat belt tension sensor low reference terminal B X2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PPS module.
4. Ignition OFF, disconnect the harness connector at the PPS module.
5. Ignition ON, test for infinite resistance between the passenger seat belt tension sensor signal circuit terminal C X2 and ground. If less than the specified value, test the signal circuit for a short to ground.
6. Ignition ON, test for less than 1 volt between the passenger seat belt tension sensor signal circuit terminal C X2 and ground. If greater than the specified range, test the circuit for a short to voltage
7. Test for less than 1 ohm between the PPS module signal circuit terminal 4(X88+HP2/Z88+HP2) or terminal 6 (-HP2/Z75+HP2) and the passenger seat belt tension sensor terminal C X2. If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the PPS module.
8. If all circuits test normal, replace the passenger seat belt buckle which includes the seat belt tension sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
2. «Driver or Passenger Seat Belt Buckle Replacement (with HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system) or «Driver or Passenger Seat Belt Buckle Replacement (without HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system)
3. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PPS replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using the diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The passenger presence system (PPS) uses a silicone filled sensor pad located underneath the passenger seat foam cushion and is connected by a hose clamp to a pressure sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder by the pressure sensor. The pressure sensor is a 3-wire sensor consisting of a power, ground, and signal circuit. The PPS continually monitors itself and if a fault in this circuit occurs, a DTC will set. When the sensing and diagnostic module (SDM) detects this DTC within the PPS, it will notify the customer of the enable/disable status by illuminating the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the PPS will communicate to the SDM through serial data communications that a PPS fault is present. The SDM will then suppress the deployment of the instrument panel (I/P) module and then illuminate the AIR BAG indicator.

Ignition voltage is between 9-16 volts.

1. The PPS detects the voltage at the PPS sensor signal is less than 0.5 volt or greater than 4.5 volts for 500 milliseconds.
2. The PPS detects the voltage at the PPS sensor 5 volt reference is less than 4.5 volts or greater than 9.1 volts for 500 milliseconds.
3. The PPS detects the amperage at the PPS sensor low reference is 25 mA or greater for 500 milliseconds.

1. The PPS will set a DTC, and then communicate with the SDM.
2. The SDM disables the I/P module deployment loop.
3. The PPS will illuminate the passenger air bag status OFF indicator.
4. The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

1. The condition for setting the DTC no longer exists.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the PPS pressure sensor and inspect the component and harness sides for damage or corrosion. If damage or corrosion is found, repair or replace as necessary.
2. Ignition ON, test for 4.5-5.5 volts between the voltage reference circuit terminal A and ground. If less that the specified range, test the voltage reference circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the PPS. If greater that the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the PPS.
3. Ignition OFF, remove the AIR BAG BATT Fuse. Test for less than 2.0 ohms between low reference terminal C and ground. If greater than the specified range, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the PPS.
4. Ignition OFF, disconnect the harness connector at the PPS module.
5. Test for infinite resistance between the signal circuit terminal B and ground. If less than the specified value, test the signal circuit for a short to ground.
6. Ignition ON, test for less than 1 volt between the signal circuit terminal B and ground. If greater than the specified range, test the signal circuit for a short to voltage.
7. Test for less than 1 ohm between the PPS sensor signal circuit terminal B and the PPS module terminal 6. If greater than the specified range, test the signal circuit for open/high resistance. If the circuit tests normal, replace the PPS.
8. If all circuits test normal, replace the PPS which includes the pressure sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PPS replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category

The inflatable restraint seat position sensor is used to determine the proximity of a front driver or passenger seat position with respect to the frontal air bag. There are two states of seat position, forward and rearward. The seat position sensor interfaces with the sensing and diagnostic module (SDM) and allows the SDM to disable stage 2 of the frontal air bag for a front seat that is forward of the forward/rearward point in seat track. The seat position sensor provides 2 current ranges, one range for the forward seat position and one for rearward seat position. When the SDM receives input from a seat position sensor that the seat is rearward, and the SDM will not disable stage 2 deployment. When the seat is forward, the SDM will disable stage 2 deployment. The SDM monitors the seat position sensor circuit and if a fault is detected, the SDM will set code B0079 or B0080 and disable stage 2 frontal deployment.

Ignition voltage is between 9-16 V.

B0079 01, B0080 01

The SDM detects the seat position sensor signal circuit is shorted to voltage for 2 seconds.

B0079 02, B0080 02

The SDM detects the seat position sensor signal circuit is shorted to ground for 2 seconds.

B0079 04, B0080 04

The SDM detects the seat position sensor signal circuit is open for 2 seconds.

B0079 05, B0080 05

The SDM detects the seat position sensor signal circuit is open or has a high voltage condition for 2 seconds.

B0079 06, B0080 06

The SDM detects the seat position sensor signal circuit is shorted to ground or an open for 2 seconds.

B0079 08, B0080 08

The SDM detects an invalid signal on the seat position sensor signal circuit.

B0079 0C, B0080 0C

The SDM detects a low current condition in the seat position sensor signal circuit for 2 seconds.

1. The SDM defaults the seat position sensor to seat forward threshold.
2. The SDM requests the instrument panel cluster to illuminate the AIR BAG indicator.

1. The condition for setting the DTC no longer present.
2. A history DTC will clear once 100 fault-free ignition cycles have occurred.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
3. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
4. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC B0079 08 or B0080 08 is not set. If the DTC is set with the symptom byte 08, replace the appropriate B88 seat position sensor.
2. Ignition ON, observe the scan tool seat position sensor parameter. The reading should be between 2-20 m A. With the scan tool verify that the seat position sensor parameter is between 2-20 m A. If not within the specified range, refer to Circuit/System Testing.
3. With the seat un-weighted, observe the scan tool while moving the seat to the full forward and then full rearward positions. The seat position sensor parameter should be continuously between 2-20 m A. If not within the specified range, refer to Circuit/System Testing.
4. While sitting in the seat, observe the scan tool while moving the seat to the full forward and then full rearward positions. The seat position sensor parameter should be continuously between 2-20 m A. If not within the specified range, refer to Circuit/System Testing.

Note. When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector: Seat position sensor SDM module Seat position sensor wiring harness connector SDM wiring harness connector

1. Ignition OFF, disconnect the harness connector at the appropriate B88 seat position sensor.
2. Test for less than 10 ohms between the low reference circuit terminal 1 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K36 SDM.
3. Ignition ON, test for 4-9 V between the signal circuit terminal 2 and ground. If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K36 SDM. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K36 SDM.
4. If all circuits test normal, replace the B88 seat position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Inflatable Restraint Seat Position Sensor Replacement (with HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Inflatable Restraint Seat Position Sensor Replacement (without HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
2. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
3. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using the diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the ignition is turned ON, the passenger presence system (PPS) and the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions. When the SDM has completed the power-up mode, the SDM will establish communication with the PPS module. The SDM will also request the instrument panel cluster (IPC) to illuminate both of the PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. If the SDM determines the correct PPS is installed and functioning normally, the SDM will illuminate the passenger air bags ON or OFF indicator based on messages from the PPS. The SDM sends a message to the IPC to illuminate the appropriate PASSENGER AIR BAG ON/OFF indicator.

Ignition voltage is between 9-16 volts.

All of the following conditions must exist for 5 seconds

B0081 0F

The SDM sets this DTC if there is a fault present in the PPS module.

B0081 3A

The SDM sets this DTC when the SDM has received a message from the PPS which indicates a mismatch between the SDM and PPS module. There is either an incorrect SDM or PPS module installed on this vehicle.

B0081 4B

The PPS module sets this DTC when the PPS module has not learned the calibrations.

B0081 5A

The PPS module sets this code when the PPS module has lost communications with the SDM.

B0081 39

The SDM sets this DTC when the SDM has received a critical fault message from the PPS module.

B0081 71

The SDM sets this DTC when the SDM has received invalid serial data from the PPS module.

1. The SDM disables the passenger instrument cluster air bag.
2. The PPS module will illuminate the Passenger Airbag On/Off indicator status as OFF.
3. When the PPS module sets this DTC, the PPS module communicates with the SDM to turn the AIRBAG indicator on.
4. When the SDM sets this DTC, the SDM will turn the AIRBAG indicator on.
5. The SDM requests the instrument panel cluster (IPC) to illuminate the AIRBAG indicator.

1. The condition for setting the DTC no longer exists and there is no activity on the low speed serial data circuits.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

If either the SDM or PPS module were replaced, verify that the correct replacement part numbers were used for this vehicle.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, verify that DTC B0081 is the only DTC set in the SDM or PPS module. If any other DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Verify DTC B0081 0F, DTC B0081 3A, DTC B0081 39, or DTC B0081 71 is not set in the SDM. If any of these DTCs set in the SDM diagnose the following: SDM DTC B0081 0F: If DTC B0081 0F sets in the SDM then the PPS module will set DTC B0081 4B or DTC B0081 5A. Refer to step #3 and diagnose the PPS module DTC's. By diagnosing these two DTC's in the PPS module, DTC B0081 0F will be fixed in the SDM. SDM DTC B0081 3A: Either an incorrect replacement PPS module or SDM was placed in this vehicle. Check and make sure the part #'s are correct for each module. If both part #'s are correct clear this DTC and see if DTC B0081 3A resets as a current DTC. If DTC B0081 3A resets then replace the PPS module. Clear DTCs again and check if DTC B0081 3A sets as current again. If DTC B0081 3A sets again then replace the SDM. SDM DTC B0081 39: If DTC B0081 39 sets in the SDM then replace the PPS module. SDM DTC B0081 71: If DTC B0081 71 sets in the SDM check and see if the SDM also sets DTC U0170. If DTC U0170 is set in the SDM then diagnose DTC U0170. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If DTC U0170 is not set in the SDM then check the connections at the SDM and PPS module. Clear DTC's and check if DTC B0081 71 sets as current. If DTC B0081 71 sets as current again then replace the PPS module. Verify DTC B0081 4B, or DTC B0081 5A is not set in the PPS module. If either of these DTCs set in the PPS module diagnose the following: PPS DTC B0081 4B: If DTC B0081 4B sets in the PPS module if the correct calibration was not learned by the PPS module. Replace the PPS module. PPS DTC B0081 5A: If DTC DTC B0081 5A sets in the PPS module check the connections at the SDM and PPS module. Clear the DTC's and check if DTC B0081 5A sets again in the PPS module. If DTC B0081 5A sets again replace the PPS module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PPS module and SDM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using the diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the ignition is turned ON, the passenger presence system (PPS) and the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions. When the SDM has completed the power-up mode, the SDM will establish communication with the PPS module. The SDM will also request the instrument panel cluster (IPC) to illuminate both of the PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. If the SDM determines the correct PPS is installed and functioning normally, the SDM will illuminate the passenger air bags ON or OFF indicator based on messages from the PPS. The SDM sends a message to the IPC to illuminate the appropriate PASSENGER AIR BAG ON/OFF indicator.

Ignition voltage is between 9-16 volts.

All of the following conditions must exist for 5 seconds

The SDM sets this DTC if there is a fault present in the PPS module.

The SDM sets this DTC when the SDM has received a message from the PPS which indicates a mismatch between the SDM and PPS module. There is either an incorrect SDM or PPS module installed on this vehicle.

The PPS module sets this DTC when the PPS module has not learned the calibrations.

The PPS module sets this code when the PPS module has lost communications with the SDM.

The SDM sets this DTC when the SDM has received a critical fault message from the PPS module.

The SDM sets this DTC when the SDM has received invalid serial data from the PPS module.

1. The SDM disables the passenger instrument cluster air bag.
2. The PPS module will illuminate the Passenger Airbag On/Off indicator status as OFF.
3. When the PPS module sets this DTC, the PPS module communicates with the SDM to turn the AIRBAG indicator on.
4. When the SDM sets this DTC, the SDM will turn the AIRBAG indicator on.
5. The SDM requests the instrument panel cluster (IPC) to illuminate the AIRBAG indicator.

1. The condition for setting the DTC no longer exists and there is no activity on the low speed serial data circuits.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

If either the SDM or PPS module were replaced, verify that the correct replacement part numbers were used for this vehicle.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, verify that DTC B0081 is the only DTC set in the SDM or PPS module. If any other DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Verify DTC B0081 0F, DTC B0081 3A, DTC B0081 39, or DTC B0081 71 is not set in the SDM. If any of these DTCs set in the SDM diagnose the following: SDM DTC B0081 0F: If DTC B0081 0F sets in the SDM then the PPS module will set DTC B0081 4B or DTC B0081 5A. Refer to step #3 and diagnose the PPS module DTC's. By diagnosing these two DTC's in the PPS module, DTC B0081 0F will be fixed in the SDM. SDM DTC B0081 3A: Either an incorrect replacement PPS module or SDM was placed in this vehicle. Check and make sure the part #'s are correct for each module. If both part #'s are correct clear this DTC and see if DTC B0081 3A resets as a current DTC. If DTC B0081 3A resets then replace the PPS module. Clear DTCs again and check if DTC B0081 3A sets as current again. If DTC B0081 3A sets again then replace the SDM. SDM DTC B0081 39: If DTC B0081 39 sets in the SDM then replace the PPS module. SDM DTC B0081 71: If DTC B0081 71 sets in the SDM check and see if the SDM also sets DTC U0170. If DTC U0170 is set in the SDM then diagnose DTC U0170. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If DTC U0170 is not set in the SDM then check the connections at the SDM and PPS module. Clear DTC's and check if DTC B0081 71 sets as current. If DTC B0081 71 sets as current again then replace the PPS module.
3. Verify DTC B0081 4B, or DTC B0081 5A is not set in the PPS module. If either of these DTCs set in the PPS module diagnose the following: PPS DTC B0081 4B: If DTC B0081 4B sets in the PPS module if the correct calibration was not learned by the PPS module. Perform the Passenger Presence System Rezeroing procedure. Refer to «Passenger Presence System Rezeroing (Tahoe Hybrid and Yukon Hybrid)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) . PPS DTC B0081 5A: If DTC DTC B0081 5A sets in the PPS module check the connections at the SDM and PPS module. Clear the DTC's and check if DTC B0081 5A sets again in the PPS module. If DTC B0081 5A sets again replace the PPS module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for PPS module and SDM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID, state of health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds. The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit. When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present, the SDM will set a DTC.

Ignition voltage is between 9-16 volts.

Any of the following conditions exist for 2.5 seconds

B0083 00, B0084 00, B0085 00, B0086 00, B0087 00, B0088 00

1. The front end sensor has been shorted to voltage, open, or shorted to ground.
2. The front end sensor current has been above 23 mA for longer than 5 milliseconds.
3. The SDM has not received a message from the front end sensor for more than 375 milliseconds.

B0083 0F, B0084 0F, B0085 0F, B0086 0F, B0087 0F, B0088 0F

The SDM has received erratic messages from the front end sensor.

B0083 39, B0084 39, B0085 39, B0086 39, B0087 39, B0088 39

1. The SDM has received a Not Ok (NOK) message from the front end sensor.
2. The SDM has not received a message.
3. The SDM has received invalid serial data from the front end sensor.

B0083 3A, B0084 3A, B0085 3A, B0086 3A, B0087 3A, B0088 3A

1. The SDM has received an ID message from the front end sensor, which does not match the ID stored in the SDM memory.
2. The SDM has reset the front end sensor twice without detecting the correct ID message.

B0083 71, B0084 71, B0085 71, B0086 71, B0087 71, B0088 71

The SDM has received invalid serial data from the front end sensor.

1. The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
2. The SIR System is disabled and no deployments are allowed.

1. The condition for setting the DTC no longer exists.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
3. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

1. Ignition OFF, disconnect the harness connector at the appropriate sensor.
2. Disconnect the harness connector at the SDM.
3. Ignition ON, test for less than 1 volt between the following signal circuit and ground. Right front end sensor terminal 1 Left front end sensor terminal 1 Right front side impact sensor terminal B Left front side impact sensor terminal B Right rear side impact sensor terminal B Left rear side impact sensor terminal B If greater than the specified range, test the circuit for a short to voltage.
4. Ignition ON, test for less than 1 volt between the low reference circuit and ground. Right front end sensor terminal 2 Left front end sensor terminal 2 Right front side impact sensor terminal A Left front side impact sensor terminal A Right rear side impact sensor terminal A Left rear side impact sensor terminal A If greater than the specified range, test the circuit for a short to voltage.
5. Test for infinite resistance between the signal circuit and ground. Right front end sensor terminal 1 Left front end sensor terminal 1 Right front side impact sensor terminal B Left front side impact sensor terminal B Right rear side impact sensor terminal B Left rear side impact sensor terminal B If less than the specified value, test the circuit for a short to ground.
6. Test for less than 1 ohm between the following signal circuit terminals. Right front end sensor terminal 1 and SDM terminal 37. Left front end sensor terminal 1 and SDM terminal 36. Right front side impact sensor terminal B and the SDM terminal 43. Left front side impact sensor terminal B and the SDM terminal 42. Right rear side impact sensor terminal B and the SDM terminal 45. Left rear side impact sensor terminal B and the SDM terminal 44. If greater than the specified range, test the circuit for an open/high resistance.
7. Test for less then 1 ohm between the following front end sensor low reference circuit terminals. Right front end sensor terminal 2 and SDM terminal 39. Left front end sensor terminal 2 and SDM terminal 38. Right front side impact sensor terminal A and the SDM terminal 41. Left front side impact sensor terminal A and the SDM terminal 40. Right rear side impact sensor terminal A and the SDM terminal 47. Left rear side impact sensor terminal A and the SDM terminal 46. If greater than the specified range, test the circuit for an open/high resistance.
8. If all circuits test normal, replace the appropriate sensor.
9. Reconnect all SIR components. Ignition ON, with a scan tool clear and check for DTCs. If the DTC returns and is current, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Inflatable Restraint Front End Sensor Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
2. «Inflatable Restraint Side Impact Sensor Replacement (Front Side Door)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Inflatable Restraint Side Impact Sensor Replacement (Rear Side Door)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
3. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID, state of health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds. The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit. When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present, the SDM will set a DTC.

Ignition voltage is between 9-16 volts.

B0091 00

1. The front end sensor has been shorted to voltage, open, or shorted to ground.
2. The front end sensor current has been above 23 mA for longer than 5 milliseconds.
3. The SDM has not received a message from the front end sensor for more than 375 milliseconds.

B0091 01

1. The front end sensor has been shorted to voltage.
2. The front end sensor current has been above 23 mA for longer than 5 milliseconds.
3. The SDM has not received a message from the front end sensor for more than 375 milliseconds.

B0091 02

1. The front end sensor has been shorted to ground.
2. The front end sensor current has been above 23 mA for longer than 5 milliseconds.
3. The SDM has not received a message from the front end sensor for more than 375 milliseconds.

B0091 05

1. The front end sensor has been shorted to voltage.
2. The front end sensor circuit is open.
3. The front end sensor current has been above 23 mA for longer than 5 milliseconds.
4. The SDM has not received a message from the front end sensor for more than 375 milliseconds.

B0091 0F

The SDM has received erratic messages from the front end sensor.

B0091 39

1. The SDM has received a NOK message from the front end sensor.
2. The SDM has not received a message.

B0091 3A

1. The SDM has received an ID message from the front end sensor, which does not match the ID stored in the SDM memory.
2. The SDM has reset the front end sensor twice without detecting the correct ID message.

B0091 71

The SDM has received invalid serial data from the front end sensor.

1. The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
2. The frontal SIR System is disabled and no frontal deployments are allowed. Side deployments and rollover detection is still enabled.

1. The condition for setting the DTC no longer exists.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the front end sensor harness connector. Refer to «Inflatable Restraint Front End Sensor Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) for location of connector.
2. Remove the SDM harness connector. Refer to SDM replacement for location of connector.
3. Test for infinite resistance between the front end sensor signal circuit terminal 1 and ground. If less than the specified value, test the circuit for a short to ground.
4. Ignition ON, test for less than 1 volt between the front end sensor signal circuit terminal 1 and ground. If greater than the specified range, test the circuit for a short to voltage.
5. Ignition ON, test for less than 1 volt between the front end sensor low reference circuit terminal 2 and ground. If greater than the specified range, test the circuit for a short to voltage.
6. Test for less then 1 ohm between the front end sensor signal circuit terminal 1 and the SDM terminal. If greater than the specified range, test the circuit for an open/high resistance.
7. Test for less then 1 ohm between the front end sensor low reference circuit terminal 2 and the SDM terminal. If greater than the specified range, test the circuit for an open/high resistance.
8. If the circuits test normal, replace the appropriate front end sensor.
9. Reconnect all SIR components. Ignition ON, with a scan tool clear and recheck for DTCs. If the front end sensor DTC returns and is current, replace the SDM.

1. «Inflatable Restraint Front End Sensor Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
2. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
3. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM replacement, setup, and programming

Repair Verification

Ignition ON, use the scan tool to clear the DTCs, then recheck for DTCs.

1. If DTC B0091 was current, replace the SDM.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The inflatable restraint sensing and diagnostic module (SDM) stores a primary data key, which is a 4-digit number, and a secondary data key, which is a portion of the vehicle identification number (VIN). When the ignition is turned ON, the SDM compares this information to the information stored in the body control module (BCM) over the serial data communication circuit.

Ignition voltage is between 9-16 V.

1. The 4-digit primary data key stored in the SDM does not match the 4 digits stored in the BCM.
2. The VIN stored in the BCM is not in the acceptable range of VINs allowed by the SDM calibration.

1. The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
2. The SDM disables all deployments.

1. The last 4-digit Primary Data Key in the SDM match the last 4 digits stored in the BCM.
2. The VIN stored in the BCM is in the acceptable range of VINs allowed by the SDM calibration.

This DTC is an indication that an incorrect SDM is installed in the vehicle, or that the SDM and/or the BCM was replaced without reprogramming the BCM with the new information.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, verify the scan tool Primary Key Status displays Valid. If not the specified value, verify the scan tool SDM Primary Key matches the Received Primary Key. If the key does not match, perform the Setup SDM Primary Key in BCM procedure.
2. Ignition ON, verify the scan tool Secondary Key Status displays Valid. If not the specified value, verify the scan tool received VIN Digits 2-7 match the vehicle VIN.

1. If the VIN does not match, reprogram the BCM and perform the Setup SDM Primary Key in BCM procedure.
2. If the VIN matches, reprogram the SDM, ensure the correct SDM calibration is used and perform the Setup SDM Primary Key in BCM procedure.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SDM and BCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle rollover sensor (ROS) monitors the vehicle speed signal (VSS) on the GMLAN serial data circuit. If the VSS is marked as invalid or is missing, the ROS will set a diagnostic trouble code (DTC).

Ignition voltage is between 9-16 volts.

If the VSS is marked as invalid or is missing.

1. The condition for setting the DTC no longer exists.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

DTC B1011 does not indicate a ROS system malfunction and will not cause any warning indicators to illuminate. Factors such as a long engine crank or a delay in serial data communications will cause B1011 to set.

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
3. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

SIR/SRS Wiring Repairs

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The inflatable restraint sensing and diagnostic module (SDM) monitors the number of safety components installed on the vehicle. When the ignition is turned ON, the SDM evaluates the number of safety components installed and compares it to the number of components the SDM expects to see on the vehicle with its current calibration. If there is a mismatch between detected components and the components programmed with the SDM calibration, DTC B1019 will set. The components (if equipped) that the SDM will detect include inflatable restraint deployment loops, impact sensors, passenger presence system components, seat position sensors, disable switches, and seat belt switches.

Ignition voltage is between 9-16 V.

The setup for the SDM has not been completed and the SDM does not detect the correct number of sensors or deployment loops than is expected with this calibration.

1. The SDM requests the instrument cluster to illuminate the AIR BAG warning indicator.
2. The DTC must be cleared before running the setup SDM.
3. Air bag indicator will continue to flash until SDM setup procedure is complete.

1. The condition for setting the DTC is no longer present.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

The SDM scan tool deployment loop and impact sensor data will match what the SDM has been programmed to expect to see on the vehicle. B1019 DTC will set if a deployment loop or impact sensor is added or removed from the system.

DTC B1019 will set when an open/high resistance DTC sets for a deployment loop or impact sensor. This causes mismatch between the learned and actual components connected to the SDM.

DTC B1019 can set with no other DTCs if an unused deployment loop or impact sensor circuit is shorted to ground. This causes a mismatch between the learned and actual components connected to the SDM.

Schematic Reference

1. «Seat Belt Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system)
2. «SIR Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)

Connector End View Reference

Component Connector End Views

Description and Operation

1. «Seat Belt System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system)
2. «SIR System Description and Operation»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
3. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. DTC B1019 can set after SDM has been replaced and/or reprogrammed before the setup procedure is completed. The setup procedure cannot be completed if DTC B1019 is set as current or history. If a short or open is detected in a deployment circuit prior to the setup procedure being performed the SDM will set DTC B1019.

1. Ignition ON, verify no other SDM DTC are set. If another SDM DTC is set, diagnose those DTCs first. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list)
2. With the scan tool observe the SDM impact sensor configuration scan tool data list. Verify the impact sensors called out in the scan tool data list match the number of actual impact sensors the vehicle is built with. If the number of impact sensors do not match verify the correct SDM calibration file is loaded in the SDM. If the SDM calibration file is correct, the vehicle contains less/more sensors than it is supposed to. Modify the vehicle to match the SDM impact sensor calibration scan tool data list.
3. With the scan tool observe the SDM enabled deployment loop configuration scan tool data list. Verify the enabled deployment loops called out in the scan tool data list match the deployment loops the vehicle is built with. If the number of enabled deployment loops do not match verify the correct SDM calibration file is loaded in the SDM. If the SDM calibration file is correct, modify the vehicle to match the SDM enabled deployment loop calibration scan tool data list.
4. If the SDM impacts sensor and enabled deployment loops match the vehicle build and the DTC is still current, replace the K36 SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for SDM replacement, setup, and programming

Introduction

The inflatable restraints passenger presence system (PPS) is a calibrated system that requires rezeroing anytime the seat cushion trim attachments have been removed or the PPS has been replaced. The procedures below are designed to assist in the rezeroing of the PPS. Before you start, read these procedures carefully and completely. For further information regarding the PPS refer to SIR System Description and Operation .

Note. The following procedures must be followed

1. Read this procedure carefully and completely.
2. The PPS will not function properly if the PPS rezeroing procedure is not performed.
3. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) after successfully completing the rezeroing procedure to ensure the system is functioning properly.

Passenger Presence System (PPS) Rezeroing Procedure

Note. Before rezeroing the PPS, the front passenger seat must be completely empty of all items. The presence of any items on the front passenger seat will affect the calibration and operation of the PPS.

1. Empty the front outboard passenger seat.
2. Verify that all SIR and PPS components, connectors, and connector position assurances (CPAs) are properly connected and mounted.
3. Install a scan tool.
4. Turn ON the ignition, with the engine OFF.
5. Use the scan tool in order to clear the SIR and PPS DTCs.
6. With a scan tool, request the PPS rezeroing procedure.
7. Initiate the PPS rezeroing procedure. The PPS will illuminate both PASSENGER AIR BAG ON and OFF indicators until the rezeroing procedure has been completed.
8. When the rezeroing procedure has been successfully completed, the PPS will display the current system status.
9. If the rezeroing procedure was unsuccessful, repeat this procedure. Due to the communication status between the SDM and the PPS module, this procedure may have to be repeated until a successful rezero attempt has been achieved.
10. After the PPS has been successfully rezeroed, perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .

Symptoms - SIR

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the SIR system. Refer to «Checking Aftermarket Accessories»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

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

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

Air Bag Indicator Circuit Malfunction (Driver)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the ignition is turned ON, the instrument panel cluster (IPC) flashes the air bag indicator 7 times for a bulb check. The inflatable restraint sensing and diagnostic module (SDM) performs diagnostic tests on the SIR system during the bulb check. If any malfunction exists the SDM will request the IPC to illuminate the air bag indicator steady, via serial data. If a preexisting malfunction exists, the air bag indicator will illuminate steady immediately after the ignition is turned ON. If the ignition 1 voltage is outside of the normal operating voltage range 9-16 volts, the SDM will command the IPC to illuminate the air bag indicator with no DTCs present, then disables all deployment loops.

A DTC B1370 may set if the ignition 1 circuit is outside the 9-16 volts range.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, verify the SDM Battery Voltage Signal parameter is 9-16 volts. If not the specified range, refer to «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .
2. Ignition OFF, monitor the IPC, ignition ON. The SIR warning indicator should flash then turn OFF. If the SIR warning indicator continually flashes, program the SDM. If the SIR warning indicator remains on steady, test for DTCs and refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no DTC is current, proceed to the next step.
3. Perform the Display Test in Instrument Panel Cluster/Special Functions. The Air Bag indicator should turn ON and OFF as commanded. If the air bag indicator does not illuminate as expected, replace the IPC.
4. If all circuits test normal, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for IPC and SDM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The PASSENGER AIR BAG ON/OFF indicators are used to notify the driver when the passenger presence system (PPS) has enabled or disabled the instrument panel (I/P) inflator module. When the ignition is turned ON, the PPS module will illuminate both PASSENGER AIR BAG ON/OFF indicators for 5 seconds. The PPS module conducts tests on the PPS components and circuits while both PASSENGER AIR BAG ON/OFF indicators are illuminated. If no malfunctions are detected, the PPS module will turn the PASSENGER AIR BAG indicator ON or OFF, depending on the status of the PPS. If a malfunction is detected, the PPS module will store a DTC, default the PPS to the OFF state, and communicate with the sensing and diagnostic module (SDM) that a DTC has been set. The SDM will request the instrument panel cluster (IPC) to illuminate the AIR BAG indicator to notify the driver of a malfunction.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
5. «SIR/SRS Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the inflatable restraint passenger air bag On/Off indicator.
2. Ignition OFF, test for less then 1 ohm between the ground circuit terminal 2 and ground. If greater then the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 4 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the inflatable restraint passenger air bag On/Off indicator.
4. Connect a test lamp between the control circuit terminal 3 and the ignition circuit terminal 4. With the passenger seat unoccupied, then occupied the test lamp should switch states within 5 seconds. If the test lamp is always on, test the control circuit for a short to ground. If all circuits test normal replace the IPC. If the test lamp is always off, test the control circuit for a short to voltage or an open/high resistance. If all circuits test normal replace the IPC.
5. Connect a test lamp between the control circuit terminal 1 and the ignition circuit terminal 4. With the passenger seat unoccupied, then occupied the test lamp should switch states within 5 seconds. If the test lamp is always on, test the control circuit for a short to ground. If all circuits test normal replace the IPC. If the test lamp is always off, test the control circuit for a short to voltage or an open/high resistance. If all circuits test normal replace the IPC.
6. If all circuits test normal, replace the inflatable restraint passenger air bag on/off indicator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Inflatable Restraint Instrument Panel Module Indicator Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)
2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for IPC and SDM replacement, setup, and programming

SIR Disabling and Enabling

SIR component location affects how a vehicle should be serviced. There are parts of the SIR system installed in various locations around a vehicle. To find the location of the SIR components refer to SIR Identification Views .

There are several reasons for disabling the SIR system, such as repairs to the SIR system or servicing a component near or attached to an SIR component. There are several ways to disable the SIR system depending on what type of service is being performed. The following information covers the proper procedures for disabling/enabling the SIR system.

SIR Service Precautions

The inflatable restraint sensing and diagnostic module (SDM) maintains a reserved energy supply. The reserved energy supply provides deployment power for the air bags if the SDM loses battery power during a collision. Deployment power is available for as much as 1 minute after disconnecting the vehicle power. Waiting 1 minute before working on the system after disabling the SIR system prevents deployment of the air bags from the reserved energy supply.

General Service Instructions

The following are general service instructions which must be followed in order to properly repair the vehicle and return it to its original integrity

1. Do not expose air bags to temperatures above 65°C (149°F).
2. Verify the correct replacement part number. Do not substitute a component from a different vehicle.
3. Use only original GM replacement parts available from your authorized GM dealer. Do not use salvaged parts for repairs to the SIR system.

Discard any of the following components if it has been dropped from a height of 92 cm (3 feet) or greater

1. Inflatable restraint sensing and diagnostic module (SDM)
2. Any air bag
3. Driver steering wheel air bag coil
4. Any impact sensor
5. Seat belt anchor and/or retractor pretensioners
6. Passenger presence module and/or occupant sensor

Disabling Procedure - Air Bag Fuse

1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead.
2. Place the ignition in the OFF position.
3. Locate and remove the fuse(s) supplying power to the SDM. Refer to «SIR Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Electrical Center Identification Views»(/cadillac/escalade/gmt900-2006-2014/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views) .
4. Wait 1 minute before working on the system.

Enabling Procedure - Air Bag Fuse

1. Place the ignition in the OFF position.
2. Install the fuse(s) supplying power to the SDM. Refer to «SIR Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Electrical Center Identification Views»(/cadillac/escalade/gmt900-2006-2014/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views) .
3. Turn the ignition switch to the ON position. The AIR BAG indicator will flash then turn OFF.
4. Perform the Diagnostic System Check - Vehicle if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .

Disabling Procedure - Negative Battery Cable

1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead.
2. Place the ignition in the OFF position.
3. Disconnect the negative battery cable from the battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
4. Wait 1 minute before working on system.

Enabling Procedure - Negative Battery Cable

1. Place the ignition in the OFF position.
2. Connect the negative battery cable to the battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#battery-charging-system-and-starting-system) .
3. Turn the ignition switch to the ON position. The AIR BAG indicator will flash then turn OFF.
4. Perform the Diagnostic System Check - Vehicle if the AIR BAG warning indicator does not operate as described. Refer to «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .

The inflatable restraint sensing and diagnostic module (SDM) maintains a reserved energy supply. The reserved energy supply provides deployment power for the air bags. Deployment power is available for as much as 1 minute after disconnecting the vehicle power. Disabling the SIR system prevents deployment of the air bags from the reserved energy supply.

The following are general service instructions which must be followed in order to properly repair the vehicle and return it to its original integrity

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

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

1. Inflatable restraint sensing and diagnostic module (SDM)
2. Inflatable restraint I/P module
3. Inflatable restraint steering wheel module
4. Inflatable restraint steering wheel module coil
5. Inflatable restraint roof side rail modules
6. Inflatable restraint side impact sensors (SIS)
7. Inflatable restraint seat belt retractor pretensioners
8. Inflatable restraint front end sensors

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Special Tools

J 42640 Steering Column Anti-rotation Pin. See Special Tools .

Removal Procedure

1. Verify the following before removing the inflatable restraint steering wheel module coil: The wheels on the vehicle are straight ahead. That anti-rotation pin J 42640 is installed or the ignition and start switch is in the LOCK position. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
2. Remove the steering wheel. Refer to «Steering Wheel Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/steering-column-switches/#steering-wheel-steering-column) .
3. Remove the steering column shroud. Refer to «Steering Column Shroud Replacement (Without Electronic Tilt Steering)»(/cadillac/escalade/gmt900-2006-2014/remont/steering-column-switches/#steering-wheel-steering-column) or «Steering Column Shroud Replacement (With Electronic Tilt Steering)»(/cadillac/escalade/gmt900-2006-2014/remont/steering-column-switches/#steering-wheel-steering-column) .
4. Disconnect any electrical connectors as needed.
5. Remove the inflatable restraint steering wheel module coil retaining ring (2) and discard it. DO NOT reuse the ring.
6. Remove the inflatable restraint steering wheel module coil (1) from the steering shaft.
7. If replacing, discard the old inflatable restraint steering wheel module coil.

Installation Procedure

1. If reusing the existing inflatable restraint steering wheel module coil it MUST be centered. Refer to «Inflatable Restraint Steering Wheel Module Coil Centering»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system__inflatable-restraint-steering-wheel-module-coil) .
2. Align the inflatable restraint steering wheel module coil (1) with the horn tower on the turn signal switch cancel cam (2).
3. Slide the inflatable restraint steering wheel module coil (4) onto the steering shaft (2).
4. Firmly seat the new inflatable restraint steering wheel module coil retaining ring (3) into the appropriate groove on the steering shaft (2).
5. Remove and discard the centering tab from the new inflatable restraint steering wheel module coil (4).
6. Connect any electrical connectors as needed.
7. Install the steering column shroud. Refer to «Steering Column Shroud Replacement (Without Electronic Tilt Steering)»(/cadillac/escalade/gmt900-2006-2014/remont/steering-column-switches/#steering-wheel-steering-column) or «Steering Column Shroud Replacement (With Electronic Tilt Steering)»(/cadillac/escalade/gmt900-2006-2014/remont/steering-column-switches/#steering-wheel-steering-column) .
8. Install the steering wheel. Refer to «Steering Wheel Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/steering-column-switches/#steering-wheel-steering-column) .
9. Remove anti-rotation pin J 42640 . See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .

Inflatable Restraint Steering Wheel Module Coil Centering

1. Verify the following conditions before centering the SIR coil: The front wheels of the vehicle are in the straight ahead position. The block tooth (1) of the steering shaft assembly is in the 12 o'clock position. The ignition switch is in the LOCK position.
2. Remove the wire harness strap or straps where necessary.
3. Hold the SIR coil and look at the side with the letters POM (1).
4. Rotate the coil hub clockwise until the coil ribbon stops.
5. From the clockwise stop, rotate the coil hub slowly counterclockwise approximately 3.3 turns. Place the uplead connector (2) in the 12 o'clock position. Ensure the flat wire cable loop appears in the centering window (4). This is the CENTER position.
6. If you have the orange lock pin (3), use the lock pin to lock the SIR coil in the center position. If you do not have the orange lock pin, hold the SIR coil in the center position.
7. Align the SIR coil with the horn tower and slide the SIR coil onto the steering shaft assembly.
8. If a double wire harness strap is installed onto the wire harness assembly and the column, you must route the wires up against the steering column. One wire harness strap will surround one lead from the coil to the steering column. The other wire harness strap will surround all other leads to the steering column.

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Accident With or Without Inflator Module Deployment - Component Inspections

After any collision, inspect the following components as indicated. If you detect any damage, replace the component. If you detect any damage to the mounting points or mounting hardware, repair or replace the mounting points and mounting hardware as needed.

1. Hybrid vehicles-Perform an inspection of the high voltage system for damage. Refer to «High Voltage System Inspection»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions) .
2. The steering column-Perform the steering column accident damage checking procedures. Refer to «Steering Column Accident Damage Inspection»(/cadillac/escalade/gmt900-2006-2014/remont/steering-column-switches/#steering-wheel-steering-column__steering-column-accident-damage-inspection) .
3. The instrument panel (I/P) knee bolsters and mounting points-Inspect the knee bolsters for bending, twisting, buckling, or any other type of damage.
4. The I/P brackets, braces, etc.-Inspect for bending, twisting, buckling, or any other type of damage.
5. The seat belts-Perform the seat belt operational and functional checks. Refer to «Seat Belt System Operational and Functional Checks»(/cadillac/escalade/gmt900-2006-2014/remont/restraints-control-systems/#seat-belt-system) .
6. The I/P mounting points and brackets-Inspect for bending, twisting, buckling, or any other type of damage.
7. The roof rail and roof rail module mounting points-Inspect for bending, twisting, buckling, or any other type of damage.
8. The seats and seat mounting points-Inspect for bending, twisting, buckling, or any other type of damage.
9. Passenger seat bottom equipped with Passenger Presence System (PPS)-Check for any DTCs or problems that may cause the PPS not to function properly.

Accident With Frontal Air Bag Deployment - Component Replacement and Inspections

After a collision involving air bag deployment, replace the following components. If you detect any damage, replace the component. If you detect any damage to the mounting points or mounting hardware, repair or replace the mounting points and mounting hardware as needed.

Note. The front passenger seat is equipped with a PPS, which detects an occupant. If the requirements for disabling the I/P air bag are met then the PPS will communicate with the SDM to disable/turn off the I/P air bag, even in a accident. For more information on the PPS refer to SIR System Description and Operation .

1. Inflatable restraint front end sensors
2. Inflatable restraint I/P module, if deployed and after performing the necessary inspections listed above
3. Inflatable restraint sensing and diagnostic module (SDM)
4. Inflatable restraint steering wheel module
5. Inflatable restraint steering wheel module coil
6. Seat belt pretensioners

Perform additional inspections on the following components

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

Accident With Side Air Bag Deployment - Component Replacement and Inspections

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

1. Inflatable restraint roof rail module, on the side of the impact.
2. Inflatable restraint side impact sensors (SIS) (front/rear), on the side of the impact
3. Inflatable restraint SDM
4. Seat belt pretensioner, on the side of impact.

Perform additional inspections on the following components

1. Mounting points or mounting hardware for the SIS, roof rail module (left/right), and seat belt pretensioner on the side of impact-Inspect for any damage and repair or replace each component as needed.
2. Mounting points or mounting hardware for the SDM and vehicle rollover sensor-Inspect for any damage and repair or replace each component as needed.

Sensor Replacement Guidelines

The SIR/side air bag sensor replacement policy requires replacing sensors in the area of accident damage. The area of accident damage is defined as the portion of the vehicle which is crushed, bent, or damaged due to a collision. An example of this would be a moderate collision where the front of the vehicle impacts a tree, if the vehicle has an SIR sensor mounted forward of the radiator, replace the SIR sensor.

1. Replace the sensor whether or not the air bags have deployed.
2. Replace the sensor even if the sensor appears to be undamaged.

Sensor damage which is not visible, such as slight bending of the mounting bracket or cuts in the wire insulation, can cause improper operation of the SIR/side air bag sensing system. Do not try to determine whether the sensor is undamaged. Replace the sensor. Also, if you follow a diagnostic trouble code (DTC) table and a malfunctioning sensor is indicated, replace the sensor.

Live and Undeployed Inflator Module

Scheme 30

Take special care when handling or storing an undeployed inflator module. An inflator module deployment produces a rapid generation of gas. This may cause the inflator module, or an object in front of the inflator module, to project through the air in the event of an unlikely deployment.

Dual Stage Inflator Module

Dual stage inflator modules have 2 deployment stages. If stage 1 was used to deploy a dual stage inflator module, stage 2 may still be active. Therefore, a deployed dual stage inflator module must be treated as an active module. If disposal of a dual stage module is required, both deployment loops must be energized to deploy the air bag.

Scrapping Procedure

During the course of a vehicles useful life, certain situations may arise which will require the disposal of a live and undeployed inflator module. Do NOT dispose a live and undeployed inflator module through normal disposal channels until the inflator module has been deployed.

Do not deploy the inflator module in the following situations

1. After replacement of an inflator module under warranty-the inflator module may need to be returned undeployed to the manufacturer.
2. If the vehicle is the subject of a Product Liability report, GM-1241, related to the SIR system and is subject to a preliminary investigation-do NOT alter the SIR system in any manner.
3. If the vehicle is involved in a campaign affecting the inflator modules-follow the instructions in the Campaign Service Bulletin for proper SIR handling procedures.

Deployment Procedures

You can deploy the inflator module either inside or outside of the vehicle. The method used depends upon the final disposition of the vehicle. Review the following procedures in order to determine which will work best in a given situation

Deployment Outside Vehicle - Steering Wheel Module, I/P Module, and Roof Rail Module

Deploy the inflator module outside of the vehicle when the vehicle will be returned to service. Situations that require deployment outside of the vehicle include the following

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

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

Special Tools

1. J 38826 SIR Deployment Harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
2. J 39401-B SIR Deployment Fixture. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
3. An appropriate pigtail adapter

1. Turn OFF the ignition.
2. Remove the ignition key.
3. Put on safety glasses.
4. Remove the inflator module. If you are removing the steering wheel module, refer to «Steering Wheel Inflatable Restraint Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) . If you are removing the I/P module, refer to «Instrument Panel Inflatable Restraint Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) . If you are removing a roof rail module, refer to «Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Avalanche/Escalade EXT)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Left, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Right, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Left, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Avalanche/Escalade EXT)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Right, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
5. Place the inflator module on a work bench, with the vinyl trim cover facing up and away from the surface.
6. Clear a space on the ground about 1.85 m (6 ft) in diameter for deployment of the inflator module or deployment fixture. If possible, use a paved, outdoor location free of activity. Otherwise, use a space free of activity on the shop floor. Ensure you have sufficient ventilation.
7. Clear the area of loose or flammable objects.
8. If you are deploying a steering wheel inflator module, place the inflator module in the center of the space.
9. When deploying an I/P inflator module, perform the following instructions: Place the J 39401-B in the center of the cleared area. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) . Fill the deployment fixture with water or sand. Using the proper nuts and bolts, mount the I/P module (1) to the deployment fixture (2), with the vinyl trim facing up. Securely tighten all fasteners that hold the I/P module (1) to the deployment fixture (2).
10. When deploying a roof rail module, perform the following instructions: Place the J 39401-B (3) in the center of the cleared area. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) . Fill the deployment fixture with water or sand to provide sufficient stabilization of fixture during deployment. Adjust and secure the fixture arms (4) to the deployment fixture (3), using the proper nuts and bolts. Attach the roof rail module in the deployment fixture and securely tighten all fasteners.
11. Inspect the SIR deployment harness and the appropriate pigtail adapter (2) for damage. Replace as needed.
12. Short the 2 SIR deployment harness leads (1) together using one banana plug seated into the other.
13. Connect the appropriate pigtail adapter (2) to the SIR deployment harness (1).
14. Extend the SIR deployment harness and adapter to the full length from the deployment fixture or area.
15. Connect the inflator module (1) to the adapter (2) on the SIR deployment harness (3).
16. Clear the area of people.
17. Separate the 2 banana plugs on the SIR deployment harness that were shorted together earlier in the procedure.
18. Place a 12-volt minimum/2-amp minimum power source, such as a vehicle battery, near the shorted end of the harness.
19. Connect the SIR deployment harness wires to the power source. Deployment of the inflator module will occur when contact is made.
20. Disconnect the SIR deployment harness from the power source after the inflator module deploys.
21. If the inflator module did not deploy, disconnect the adapter and discontinue the procedure and contact the Technical Assistance Group. If deployment was successful, proceed to the following steps.
22. Seat one banana plug into the other in order to short the deployment harness leads.
23. Put on a pair of shop gloves.
24. Disconnect the pigtail adapter from the inflator module as soon as possible.
25. Inspect the pigtail adapter and the SIR deployment harness. Replace as needed.
26. Dispose of the deployed inflator module through normal refuse channels.
27. Wash your hands with a mild soap.

Deployment Inside Vehicle - Vehicle Scrapping Procedure

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

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

1. Lower the driver and passenger windows.
2. Turn the ignition switch to the OFF position and remove the ignition key.
3. Check that all inflator modules which will be deployed are mounted securely. Driver inflator module is secured to the steering wheel. Passenger inflator module is secured to the instrument panel. Left roof rail inflator module is secured to the left roof rail. Right roof rail inflator module is secured to the right roof rail.
4. Put on safety glasses.
5. Remove all loose objects from the front seats.
6. Disconnect the steering wheel module yellow connector (1) from vehicle harness yellow connector (2).
7. Cut the yellow harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
8. Strip 13 mm (0.5 in) of insulation from each of the connector wire leads.
9. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gauge) or thicker multi-strand wire. Use these wires to fabricate the driver deployment harness.
10. Strip 13 mm (0.5 in) of insulation from both ends of the wires.
11. Twist together one end from each of the wires in order to short the wires. Deployment wires shall remain shorted, and not connected to a power source until you are ready to deploy the inflator module.
12. Twist together the 2 connector wire leads from the high circuits from both stages of the steering wheel module, to one set of deployment wires. Refer to «Component Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index-a) in order to determine the correct circuits.
13. Inspect that the 3-wire connection is secure.
14. Bend flat the twisted connection.
15. Secure and insulate the 3-wire connection to the deployment harness using electrical tape.
16. Twist together the 2 connector wire leads from the low circuits from both stages of the steering wheel module, to one set of deployment wires. Refer to «Component Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index-a) in order to determine the correct circuits.
17. Inspect that the 3-wire connection is secure.
18. Bend flat the twisted connection.
19. Secure and insulate the 3-wire connection to the deployment harness using electrical tape.
20. Connect the deployment harness to the connector on the steering wheel module.
21. Route the deployment harness out of the driver side of the vehicle.
22. Disconnect the yellow left roof rail harness connector from the vehicle harness connector.
23. Cut the harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
24. Strip 13 mm (0.5 in) of insulation from each of the connector wire leads.
25. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gauge) or thicker multi-strand wire. These wires will be used to fabricate the roof rail air bag deployment harness.
26. Strip 13 mm (0.5 in) of insulation from both ends of the wires.
27. Twist together one end from each of the wires in order to short the wires.
28. Twist together one connector wire lead to one deployment wire.
29. Bend flat the twisted connection.
30. Secure and insulate the connection using electrical tape.
31. Twist together, bend, and tape the remaining connector wire lead to the remaining deployment wire.
32. Connect the deployment harness to the yellow connector of the roof rail module.
33. Route the deployment harness out of the driver side of the vehicle.
34. Disconnect the I/P module yellow harness connector (1) from the vehicle harness connector (2).
35. Cut the yellow harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
36. Strip 13 mm (0.5 in) of insulation from each of the connector wire leads.
37. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gauge) or thicker multi-strand wire. These wires will be used to fabricate the passenger deployment harness.
38. Strip 13 mm (0.5 in) of insulation from both ends of the wires.
39. Twist together one end from each of the wires in order to short the wires.
40. Twist together the 2 connector wire leads from the high circuits from both stages of the I/P module to one set of deployment wires. Refer to «Component Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index-a) in order to determine the correct circuits.
41. Inspect that the 3-wire connection is secure.
42. Bend flat the twisted connection.
43. Secure and insulate the 3-wire connection to the deployment harness using electrical tape.
44. Twist together the 2 connector wire leads from the low circuits from both stages of the I/P module to one set of deployment wires. Refer to «Component Connector End Views»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index-a) in order to determine the correct circuits.
45. Inspect that the 3-wire connection is secure.
46. Bend flat the twisted connection.
47. Secure and insulate the 3-wire connection to the deployment harness using electrical tape.
48. Connect the deployment harness to the I/P module in-line connector.
49. Route the deployment harness out of the passenger side of the vehicle.
50. Disconnect the yellow harness connector to the right roof rail air bag from the vehicle harness connector.
51. Cut the harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
52. Strip 13 mm (0.5 in) of insulation from each of the connector wire leads.
53. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gauge) or thicker multi-strand wire. These wires will be used to fabricate the roof rail module deployment harness.
54. Strip 13 mm (0.5 in) of insulation from both ends of the wires.
55. Twist together one end from each of the wires in order to short the wires.
56. Twist together one connector wire lead to one deployment wire.
57. Bend flat the twisted connection.
58. Secure and insulate the connection using electrical tape.
59. Twist together, bend, and tape the remaining connector wire lead to the remaining deployment wire.
60. Connect the deployment harness to the roof rail module yellow connector.
61. Route the deployment harness out of the passenger side of the vehicle.
62. Completely cover the windshield and the front door window openings with a drop cloth.
63. Stretch to the full length all of the deployment harness wires on the right side of the vehicle.
64. Deploy each deployment loop one at a time.
65. Place a power source, 12 V minimum/2 A minimum, such as a vehicle battery, near the shorted end of the harnesses.
66. Separate one set of wires and touch the wire ends to the power source in order to deploy the selected inflator module.
67. Disconnect the deployment harness from the power source and twist the wire ends together.
68. Continue the same process with the remaining deployment harnesses.
69. Stretch to the full length all of the deployment harness wires on the left side of the vehicle.
70. Deploy each deployment loop one at a time.
71. Place a power source, 12 V minimum/2 A minimum, such as a vehicle battery, near the shorted end of the harnesses.
72. Separate one set of wires and touch the wires ends to the power source in order to deploy the selected inflator modules.
73. Disconnect the deployment harness from the power source and twist the wire ends together.
74. Continue the same process with the remaining deployment harnesses.
75. Remove the drop cloth from the vehicle.
76. Disconnect all harnesses from the vehicle.
77. Discard the harnesses.
78. Scrap the vehicle in the same manner as a non-SIR equipped vehicle.
79. If one or all of the inflator modules did not deploy, perform the following steps to remove the undeployed modules from the vehicle: «Steering Wheel Inflatable Restraint Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) «Instrument Panel Inflatable Restraint Module Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) «Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Avalanche/Escalade EXT)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Left, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Right, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Left, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Left, Avalanche/Escalade EXT)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Rear Right, Extended Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) or «Roof Side Rail Inflatable Restraint Module Replacement (Front Right, Standard Wheelbase)»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system)

Pretensioner Handling and Scrapping

During the course of a vehicles useful life, certain situations may arise which will require the disposal of a live and undeployed seat belt pretensioner. Do not dispose of a live and undeployed seat belt pretensioner through normal disposal channels until the seat belt pretensioner has been deployed. The following information covers the proper procedures for disposing of a live and undeployed seat belt pretensioner. Do not deploy the seat belt pretensioner in the following situations

1. After replacement of a seat belt pretensioner under warranty. The seat belt pretensioner may need to be returned undeployed to the manufacturer.
2. If the vehicle is the subject of a Product Liability report, GM1241, related to the SIR system or the seat belt system. If the vehicle is subject to the Product Liability report, do not alter the SIR or seat belt system in any manner.
3. If the vehicle is involved in a campaign affecting the seat belt pretensioners. Follow the instructions in the Campaign Service Bulletin for proper SIR handling procedures.

The seat belt pretensioner can be deployed inside or outside of the vehicle. The method used depends upon the final disposition of the vehicle. Review the following procedures in order to determine which will work best in a given situation.

Deployment Outside Vehicle for Seat Belt Pretensioners

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

1. Using the SIR diagnostics, it is determined that the seat belt pretensioner is malfunctioning.
2. The seat belt pretensioner pigtail, if equipped, is damaged.
3. The seat belt pretensioner connector is damaged.
4. The seat belt pretensioner connector terminals are damaged.

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

Special Tools

1. J 39401-B SIR Deployment Fixture. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
2. J 38826 SIR Deployment Harness. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
3. An appropriate pigtail adaptor

1. Turn OFF the ignition.
2. Remove the ignition key.
3. Put on safety glasses.
4. Remove the seat belt pretensioner from the vehicle. Refer to «Seat Belt Retractor Pretensioner Replacement - Front»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
5. When carrying a seat belt pretensioner to the deployment area, keep fingers clear of the seat belt webbing.
6. Clear a space on the ground about 1.85 m (6 ft) in diameter for deployment of the seat belt pretensioner. If possible, use a paved, outdoor location free of activity. Otherwise, use a space free of activity on the shop floor. Make sure you have sufficient ventilation.
7. Make sure no loose or flammable objects are in the area.
8. Place the J 39401-B in the center of the cleared area. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
9. Fill the fixture plastic reservoir with water or sand.
10. Mount the seat belt pretensioner (1) in the SIR deployment fixture (3) with the open end facing up using the following mounting method. Adjust and secure the J 39401-B arms (4) to the deployment fixture. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) . To mount, use the proper size bolt (2) and nut (5) with washers in order to secure the seat belt pretensioner (1) to the deployment fixture brackets. Securely tighten all fasteners prior to deployment.
11. Inspect the J 38826 and the appropriate pigtail adapter for damage. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) . Replace as needed.
12. Short the 2 SIR deployment harness (1) leads together using 1 banana plug seated into the other.
13. Connect the appropriate pigtail adapter (2) to the SIR deployment harness.
14. Extend the SIR deployment harness and adapter to full length from the deployment fixture.
15. Connect the seat belt pretensioner connector (1) to the adapter (2) on the deployment harness (3).
16. Clear the area of people.
17. Separate the 2 banana plugs on the SIR deployment harness.
18. Place a 12 volt minimum/2 amp minimum power source, such as a vehicle battery, near the shorted end of the harness.
19. Connect the SIR deployment harness wires to the power source. Seat belt pretensioner deployment will occur when contact is made.
20. Disconnect the SIR deployment harness from the power source after the seat belt pretensioner deploys.
21. Seat one banana plug into the other in order to short the deployment harness leads.
22. If the seat pretensioner did not deploy, disconnect the adapter and discontinue the procedure. Contact the Technical Assistance Group. Otherwise, proceed to the following steps.
23. Put on a pair of shop gloves.
24. Disconnect the pigtail adapter from the seat belt pretensioner as soon as possible.
25. Dispose of the deployed seat belt pretensioner through normal refuse channels.
26. Wash hands with a mild soap.

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

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

1. Turn OFF the ignition.
2. Remove the ignition key.
3. Put on safety glasses.
4. Remove all loose objects from the front seats.
5. Disconnect the seat belt pretensioner connector. Refer to «Seat Belt Retractor Pretensioner Replacement - Front»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
6. Cut the seat belt pretensioner harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
7. Strip 13 mm (0.5 in) of insulation from each of the connector wire leads.
8. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gauge) or thicker multi-strand wire. These wires will be used for the seat belt pretensioner deployment harness.
9. Strip 13 mm (0.5 in) of insulation from both ends of the wires cut in the previous step.
10. Twist together one end from each of the wires in order to short the wires. Deployment wires shall remain shorted, and not connected to a power source until you are ready to deploy the seat belt pretensioner.
11. Twist together one connector wire lead to one deployment wire.
12. Inspect that the previous connections is secure.
13. Bend flat the twisted connection.
14. Secure and insulate the connection using electrical tape.
15. Twist together, bend, and tape the remaining connector wire lead to the remaining deployment wire.
16. Connect the deployment harness to the seat belt pretensioner connector.
17. Route the deployment harness out of the driver side of the vehicle.
18. Disconnect the seat belt pretensioner connector. Refer to «Seat Belt Retractor Pretensioner Replacement - Front»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
19. Cut the seat belt pretensioner connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
20. Strip 13 mm (0.5 in) of insulation from each of the connector wire leads.
21. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gauge) or thicker multi-strand wire. These wires will be used for the seat belt pretensioner deployment harness.
22. Strip 13 mm (0.5 in) of insulation from both ends of the wires cut in the previous step.
23. Twist together one end from each of the wires in order to short the wires. The deployment wires are to remain shorted, and not connected to a power source until you are ready to deploy the seat belt pretensioner.
24. Twist together one connector wire lead to one deployment wire.
25. Inspect that the previous connection is secure.
26. Bend flat the twisted connection.
27. Secure and insulate the connection using electrical tape.
28. Twist together, bend, and tape the remaining connector wire lead to the remaining deployment wire.
29. Connect the deployment harness to the seat belt pretensioner connector.
30. Route the deployment harness out of the passenger's side of the vehicle.
31. Completely cover the windshield and the front door openings with a drop cloth.
32. Deploy each deployment loop one at a time.
33. Stretch out all of the deployment harness wires on the left and right side of the vehicle to their full length.
34. Place a power source, 12 volt minimum/2 amp minimum, such as a vehicle battery, near the shorted end of the harnesses.
35. Separate one set of wires and touch the wire ends to the power source in order to deploy the seat belt pretensioners.
36. Disconnect the deployment harness from the power source and twist the wire ends together.
37. Continue the same process with the remaining deployment harnesses that are available.
38. Remove the drop cloth from the vehicle.
39. Disconnect all harnesses from the vehicle.
40. Discard the harnesses.
41. Scrap the vehicle in the same manner as a non-SIR equipped vehicle.
42. If one or more of the seat belt pretensioners did not deploy, perform the following steps to remove the undeployed seat belt pretensioner from the vehicle, refer to «Seat Belt Retractor Pretensioner Replacement - Front»(/cadillac/escalade/gmt900-2006-2014/remont/airbag/#supplemental-inflatable-restraint-system) .
43. Call the Technical Assistance Group for further assistance.

Scheme 31

The Supplemental Inflatable Restraint (SIR) System supplements the protection offered by the occupants Seat Belt System (2). The SIR system may contain several inflator modules located throughout the vehicle, i.e. steering wheel module (1) and instrument panel (I/P) module (1). In addition to inflator modules, the vehicle contains an inflatable restraint Passenger Presence System (PPS) that measures the weight of an occupant sitting in the front passenger seat. The PPS uses the weight of the occupant to determine if the I/P inflator module will be enabled or disabled. Each inflator module has a deployment loop that is controlled by the sensing and diagnostic module (SDM) mounted inside the vehicle. The SDM determines the severity of a collision with the assistance of various sensor inputs. When the SDM detects a collision of sufficient force it will process the information provided by the sensors to further support air bag deployment. The SDM performs continuous diagnostic monitoring of the SIR system electrical components. Upon detection of a circuit malfunction, the SDM will set a DTC and inform the driver by requesting the instrument panel cluster (IPC) to turn the AIR BAG indicator ON. The steering column (1) and knee bolsters (3) are designed to absorb energy and compress during frontal collisions in order to limit leg movement and decrease the chance of injury to the driver and passenger.

Frontal SIR System Description

The frontal Supplemental Inflatable Restraint (SIR) System consists of the following components

1. AIR BAG indicator located on the instrument panel cluster (IPC)
2. Driver and passenger knee bolsters
3. Inflatable restraint front end sensors (left/right)
4. Inflatable restraint PASSENGER AIR BAG ON/OFF indicator
5. Inflatable restraint Passenger Presence System (PPS)
6. Inflatable restraint passenger seat belt tension sensor
7. Inflatable restraint seat position sensor (SPS) (left)
8. Inflatable restraint sensing and diagnostic module (SDM)
9. Inflatable restraint steering wheel module
10. Inflatable restraint steering wheel module coil
11. Inflatable restraint wiring harnesses
12. Seat belt pretensioners (left/right)
13. Steering wheel and column

A frontal collision of sufficient force will deploy the frontal air bags. The SDM contains a sensing device that converts vehicle velocity changes to an electrical signal. In the event of a frontal collision, the SDM receives a signal from the front end sensors which assists the SDM in determining the severity of some frontal collisions. The SDM contains a microprocessor that performs calculations using the measured accelerations. The SDM compares these calculations to a value stored in memory. When the generated calculations exceed the stored value, the SDM will cause current to flow through the frontal deployment loops deploying the frontal air bags. Once the air bags are inflated they quickly deflate through the air bag vent holes. After the air bags have deployed, the SDM sets a diagnostic trouble code (DTC) and requests the IPC to turn the AIR BAG indicator ON. The SDM, instrument panel (I/P) module, steering wheel module, steering wheel module coil and the connecting wires makeup the frontal deployment loops. The SDM continuously monitors the deployment loops for malfunctions and requests the IPC to turn the AIR BAG indicator ON if a fault is detected.

Side SIR System Description (Front)

The side Supplemental Inflatable Restraint (SIR) System (front) consists of the following components

1. AIR BAG indicator located in the instrument panel cluster (IPC)
2. Inflatable restraint roof rail modules front/rear, (left/right)
3. Inflatable restraint sensing and diagnostic module (SDM)
4. Inflatable restraint side impact sensors (SIS) (left/right)
5. Inflatable restraint vehicle rollover sensor
6. Inflatable restraint wiring harnesses
7. Seat belt pretensioners (left/right)

The roof rail modules (front/rear) are located in the headliner along the roof rails. The roof rail modules contain a housing, inflatable air bag, initiating device, and a canister of gas generating material. The initiator is part of the roof rail module deployment loop. When a side impact of sufficient force occurs the SIS detects the impact and sends a signal to the SDM. The SDM compares the signal received from the SIS to a value stored in memory. When the generated signal exceeds the stored value, the SDM will cause current to flow through the side deployment loop deploying the roof rail air bag. The SDM, roof rail modules (front) and the connecting wires makeup the side deployment loops. The SDM continuously monitors the deployment loops for malfunctions and turns the AIR BAG indicator ON if a fault is present. Each roof rail module is equipped with a shorting bar located on the connector of the module. The shorting bar shorts the roof rail module deployment loop circuitry to prevent unwanted deployment of the air bag when servicing the inflator module.

Inflatable Restraint Sensing and Diagnostic Module (SDM)

The sensing and diagnostic module (SDM) is a microprocessor and the control center for the Supplemental Inflatable Restraint (SIR) System. The SDM contains internal sensors along with several external sensors, if equipped, mounted at various locations on the vehicle. In the event of a collision, the SDM performs calculations using the signals received from the internal and external sensors. The SDM compares the results of the calculations to values stored in memory. When these calculations exceed the stored value, the SDM will cause current to flow through the appropriate deployment loops to deploy the air bags. The SDM records the SIR System status when a deployment occurs and requests the instrument panel cluster (IPC) to turn the AIR BAG indicator ON. The SDM performs continuous diagnostic monitoring of the SIR System electrical components and circuitry when the ignition is turned ON. If the SDM detects a malfunction, a DTC will be stored and the SDM will request the IPC to turn the AIR BAG indicator ON. In the event that battery voltage is lost during a collision, the SDM maintains a 23-volt loop reserve (23 VLR) for deployment of the air bags. It is important to note, when disabling the SIR System for servicing or rescue operations to allow the 23 VLR to dissipate, which could take up to 1 minute.

Inflatable Restraint Passenger Presence System (PPS)

The PPS is used to monitor the weight of an occupant on the front outboard passenger seat and communicate the status to the sensing and diagnostic module (SDM) whether to enable or suppress the deployment of the instrument panel (I/P) module. The PPS consist of an electronic control module, silicone filled sensor pad, pressure sensor, seat belt tension sensor, wiring harness, and PASSENGER AIR BAG ON/OFF indicator. The silicone filled sensor pad is located under the passenger seat foam cushion and is connected by a hose clamped to the pressure sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder by the pressure sensor. The pressure sensor sends a voltage signal to the PPS module. If the pressure from the occupants weight is less than a specified value, the PPS module will send a suppress signal to the SDM to disable the I/P module. If the pressure from the occupants weight is higher than a specified value, the PPS module will send an enable signal to the SDM to enable the I/P module. The PPS module will notify the customer of the enable/disable status by turning on one of the PASSENGER AIR BAG ON/OFF indicator located on the overhead console. The PPS monitors itself for faults and will set diagnostic trouble codes (DTC) if a fault is detected. The PPS will also notify the SDM of a fault and the SDM will set DTC B0081 and request the instrument panel cluster (IPC) to turn ON the AIR BAG indicator located on the IPC.

Inflatable Restraint Seat Position Sensors (SPS)

The seat position sensor (SPS) is used to determine the proximity of a front driver position with respect to the frontal air bag. The SPS interfaces with the sensing and diagnostic module (SDM). The state of the SPS allows the SDM to disable stage 2 of the frontal air bag for a front seat that is forward of a forward/rearward point in seat track travel. The SPS is a Hall effect sensor that is mounted on the outboard seat track of the driver seat. The seat track includes a metal bracket that shunts the SPS magnetic circuit creating two states of seat position. The shunted state represents a rearward seat position. The non-shunted state represents a forward position. The SPS provides 2 current ranges, one range for the shunted state and a second range for a non-shunted state. These 2 states are inputs to the SDM. State 1 (shunted) being the rearward threshold and state 2 (non-shunted) being the forward threshold. When the SDM receives input from a SPS that state 1 threshold is reached (seat is rearward) the SDM will not disable stage 2 deployment, if required by the deployment sensors. When state 2 threshold is reached (seat is forward) the SDM will disable stage 2 deployment on the side the seat is forward. The SDM monitors the SPS circuit and if a fault is detected the SDM will set code B0079 and defaults to disabling stage 2 frontal deployment.

Inflatable Restraint Passenger Seat Belt Tension Sensor

The seat belt tension sensor is used to enhance the Passenger Presence System (PPS) when an infant car seat is properly restrained on the front outboard passenger seat. The seat belt tension sensor is a 3-wire potentiometer mounted on the lower seat belt anchor and provides an input to the PPS module. When an infant car seat is properly restrained on the front passenger seat, the seat belt is tightly secured through the infant car seat. The seat belt pulls on the tension sensor and changes the voltage signal to the PPS module. The PPS module uses the voltage signal to help determine if a tightly belted infant car seat is installed. The PPS uses the inputs from the seat belt tension sensor and the PPS pressure sensor to determine if the instrument panel (I/P) module should be suppressed or enabled. The PPS monitors the seat belt tension sensor circuits and sets DTC B0071 if a fault is detected.

Inflatable Restraint Vehicle Rollover Sensor

The vehicle rollover sensor is used to supplement the side Supplemental Inflatable Restraint (SIR) System. The sensing and diagnostic module (SDM) uses the input from the vehicle rollover sensor to assist in determining the severity of a vehicle rollover or near rollover condition. If the SDM determines a deployment is warranted, the SDM will cause current to flow through the deployment loops deploying the inflatable restraint roof rail modules.

AIR BAG Indicator

The AIR BAG indicator, located on the instrument panel cluster (IPC) is used to notify the driver of Supplemental Inflatable Restraint (SIR) System malfunctions and to verify that the sensing and diagnostic module (SDM) is communicating with the IPC. When the ignition is turned ON, the SDM is supplied with battery voltage and requests the IPC to flash the AIR BAG indicator 7 times. While flashing the indicator, the SDM conducts test on all SIR system components and circuits. If no malfunctions are detected the SDM will communicate with the IPC through the serial data circuit and request the IPC to turn the AIR BAG indicator OFF. The SDM provides continuous monitoring of the air bag circuits by conducting a sequence of checks. If a malfunction is detected the SDM will store a diagnostic trouble code (DTC) and request the IPC to turn the AIR BAG indicator ON. The presence of a SIR system malfunction could result in non-deployment of the air bags. The AIR BAG indicator will remain ON until the malfunction has been repaired.

Inflatable Restraint PASSENGER AIR BAG ON/OFF Indicator

The PASSENGER AIR BAG ON/OFF indicator located on the overhead console is used to notify the driver when the Passenger Presence System (PPS) has enabled or disabled the instrument panel (I/P) inflator module. The PPS air bag indicators will also inform the driver of any PPS malfunctions. When the ignition is turned on, the SDM is supplied with battery voltage and commands both PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. The PPS module conducts tests on the PPS components and circuits while both ON/OFF indicators are ON. If no malfunctions are detected the PPS module will turn the PASSENGER AIR BAG indicator ON or OFF depending on the status of the PPS. If a malfunction is detected, the PPS module will store a diagnostic trouble code (DTC), default the PPS to the OFF state and communicate with the sensing and diagnostic module (SDM) that a DTC has been set. When the SDM detects that the PPS has set a DTC, the SDM will set either DTC B0056 or B0081 and request the instrument panel cluster (IPC) to turn the AIR BAG indicator located on the IPC ON. This is done to notify the driver of any PPS malfunctions. The presence of a Supplemental Inflatable Restraint (SIR) System malfunction could result in non-deployment of the air bags. The AIR BAG indicator will remain ON until the malfunction has been repaired.

Dual Stage Inflator Modules

Dual stage inflator modules contain a housing, inflatable air bag, 2 initiating devices, canister of gas generating material and, in some cases, stored compressed gas. The 2 initiators are part of the inflator module deployment loop. The inflator modules have 2 stages of deployment, which varies the amount of restraint to the occupant according to the collision severity. For moderate frontal collisions the inflator modules deploy at less than full deployment which consists of stage 1 of the inflator module. For more severe frontal collisions a full deployment is initiated which consists of stage 1 and stage 2 of the inflator module. When the vehicle is involved in a collision of sufficient force, the sensing and diagnostic module (SDM) will cause current to flow through the deployment loops to the initiator. Current passing through the initiator ignites the material in the canister producing a rapid generation of gas and the release of compressed gas, if present. The gas produced from this reaction rapidly inflates the air bag. Once the air bag is inflated it quickly deflates through the air bag vent holes.

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

Inflatable Restraint Steering Wheel Module Coil

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

Inflatable Restraint Front End Sensors

The front end sensors are equipped on vehicles to supplement the Supplemental Inflatable Restraint (SIR) System performance. The front end sensors are electronic and are not part of the deployment loops, but instead provide inputs to the sensing and diagnostic module (SDM). The front end sensors can assist in determining the severity of some frontal collisions. The SDM uses the input from the front end sensors to assist in determining the severity of a frontal collision further supporting air bag deployment. If the SDM determines a deployment is warranted, the SDM will cause current to flow through the deployment loops deploying the frontal air bags.

Inflatable Restraint Side Impact Sensor (SIS)

The side impact sensor (SIS) contains a sensing device which monitors vehicle acceleration and velocity changes to detect side collisions that are sever enough to warrant side SIR deployment. The SIS is not part of the deployment loop, but instead provides an input to the SDM. The SDM contains a microprocessor that performs calculations using the measured accelerations and compares these calculations to a value stored in memory.

Inflatable Restraint Wiring Harnesses

The wiring harnesses connect the sensing and diagnostic module (SDM), inflator modules, Passenger Presence System (PPS), front end sensors, seat position sensors (SPS), passenger seat belt tension retractor sensor, rollover sensor, side impact sensors and the serial data circuit together using connectors. SIR deployment loop connectors are yellow in color for easy identification. When repairing Supplemental Inflatable Restraint (SIR) System wiring harnesses, follow the proper testing and wiring repair procedures outlined in this manual.

Seat Belt Pretensioner

The seat belt pretensioner consist of a housing, a seat belt retractor, the seat belt webbing, an initiator, and a canister of gas generating materials. The initiator is part of the seat belt pretensioner deployment loop. When the vehicle is involved in a collision of sufficient force, the sensing and diagnostic module (SDM) causes current to flow through the seat belt deployment loops to the initiator. Current passing through the initiator ignites the material in the canister producing a rapid generation of gas. The gas produced from this reaction deploys the seat belt pretensioner and retracts the seat belt webbing, which removes all of the slack in the seat belts. Depending on the severity of the collision, the seat belt pretensioner may deploy without the frontal inflator modules deploying, or they will deploy immediately before the frontal inflator modules deploy. Each seat belt pretensioner is equipped with a shorting bar that is located in the connector of the seat belt pretensioner. The shorting bar shorts the seat belt pretensioner circuitry to prevent unwanted deployment of the seat belt pretensioner when the connector is disconnected.

Steering Wheel and Column

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

Driver and Passenger Knee Bolsters

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

Illustration Tool Number/ Description J 38715-A Driver and Passenger SIR Load Tool J 38826 SIR Deployment Harness J 39401-B SIR Deployment Fixture J 42640 Steering Column Anti-rotation Pin

Scheme 32

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• SIR/SRS Wiring Repairs
• Driver or Passenger Seat Belt Buckle Replacement (with HP2)
• Diagnostic Trouble Code (DTC) List - Vehicle
• Checking Aftermarket Accessories
• Electrical Center Identification Views
• Battery Negative Cable Disconnection and Connection
• SIR Warning
• Lifting and Jacking the Vehicle
• Fastener Caution
• Front Side Door Trim Panel Replacement
• Front Floor Console Replacement (Cadillac)
• Radio Front Floor Console Speaker Replacement
• SIR Inflator Module Handling and Storage Warning
• Steering Wheel Replacement
• Front Seat Replacement - Bucket (with HP2)
• Front Seat Adjuster Replacement (with HP2)
• Headlining Trim Panel Replacement (LWB w/CJ3)
• Headlining Trim Panel Replacement (SWB w/CF5 and U42)
• Headlining Trim Panel Replacement (LWB w/CF5 w/o U42)
• High Voltage System Inspection
• Steering Column Accident Damage Inspection
• SIR Disabling and Enabling
• DTC B0012 or B0013
• SIR Identification Views
• Inflatable Restraint Steering Wheel Module Coil Centering
• Pretensioner Handling and Scrapping