Supplemental Inflatable Restraint System Chevrolet Chevy Express H1500

Fastener Tightening Specifications

Fastener Tightening Specifications

SIR Schematic Icons

SIR Schematic Icons Icon Icon Definition CAUTION: When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling . Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system repairs. IMPORTANT: In order to prevent accidental deployment, the shorting bars close in order to short the connectors when the connectors are separated. Twisted-pair wires provide an effective shield that helps protect sensitive electronic components from electrical interference. If the wires were covered with shielding, install new shielding. In order to prevent electrical interference from degrading the performance of the connected components, you must maintain the proper specification when making any repairs to the twisted-pair wires shown : The wires must be twisted a minimum of 9 turns per 31 cm (12 in) as measured anywhere along the length of the wires The outside diameter of the twisted wires must not exceed 6.0 mm (0.25 in)

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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 determining the appropriate SIR Disabling and Enabling for a given service procedure, refer to SIR Disabling and Enabling .

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Inflatable Restraint Front End Sensor (Heavy Duty) Connector & Terminal Parts Information

Inflatable Restraint Front End Sensor (Heavy Duty) Terminal Identification

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Inflatable Restraint Front End Sensor (Light Duty) Connector & Terminal Parts Information

Inflatable Restraint Front End Sensor (Light Duty) Terminal Identification

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Inflatable Restraint I/P Module (Heavy Duty) Connector & Terminal Parts Information

Inflatable Restraint I/P Module (Heavy Duty) Terminal Identification

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Inflatable Restraint I/P Module (Light Duty) Connector & Terminal Parts Information

Inflatable Restraint I/P Module (Light Duty) Terminal Identification

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Inflatable Restraint I/P Module Disable Switch (Heavy Duty) Connector & Terminal Parts Information

Inflatable Restraint I/P Module Disable Switch (Heavy Duty) Terminal Identification

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Inflatable Restraint PASSENGER AIR BAG ON/OFF Indicator (Light Duty w/o YF7) Connector & Terminal Parts Information

Inflatable Restraint PASSENGER AIR BAG ON/OFF Indicator (Light Duty w/o YF7) Terminal Identification

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Inflatable Restraint Passenger Presence System (PPS) Module (Light Duty w/o YF7) Connector & Terminal Parts Information

Inflatable Restraint Passenger Presence System (PPS) Module (Light Duty w/o YF7) Terminal Identification

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Inflatable Restraint Seat Position Sensor (SPS) - Left (Light Duty) Connector & Terminal Parts Information

Inflatable Restraint Seat Position Sensor (SPS) - Left (Light Duty) Terminal Identification

Inflatable Restraint Seat Position Sensor (SPS) - Right (Light Duty)

Inflatable Restraint Seat Position Sensor (SPS) - Right (Light Duty) Connector & Terminal Parts Information

Inflatable Restraint Seat Position Sensor (SPS) - Right (Light Duty) Terminal Identification

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Inflatable Restraint Sensing and Diagnostic Module (SDM) Connector & Terminal Parts Information

Inflatable Restraint Sensing and Diagnostic Module (SDM) Terminal Identification

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Inflatable Restraint Steering Wheel Module (Heavy Duty) Connector & Terminal Parts Information

Inflatable Restraint Steering Wheel Module (Heavy Duty) Terminal Identification

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Inflatable Restraint Steering Wheel Module - C1 (Light Duty) Connector & Terminal Parts Information

Inflatable Restraint Steering Wheel Module - C1 (Light Duty) Terminal Identification

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Inflatable Restraint Steering Wheel Module - C2 (Light Duty) Connector & Terminal Parts Information

Inflatable Restraint Steering Wheel Module - C2 (Light Duty) Terminal Identification

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Seat Belt Buckle Driver - C2 (Light Duty) Connector & Terminal Parts Information

Seat Belt Buckle Driver - C2 (Light Duty) Terminal Identification

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Seat Belt Buckle Passenger - C2 (Light Duty) Connector & Terminal Parts Information

Seat Belt Buckle Passenger - C2 (Light Duty) Terminal Identification

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - SIR

Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information

1. The identification of the control modules which commands the system
2. The ability of the control modules to communicate through the serial data circuit
3. The identification of any stored diagnostic trouble codes (DTC) and their status

The use of Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.

Description

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) will establish communication with the passenger presence system (PPS). When communication is established, the SDM will first request traceability/verification information from the PPS. If the SDM confirms that the correct PPS is in the vehicle, then the SDM will request the PPS status Data. If the PPS detects a malfunction, the PPS will set a DTC, and communicate with the SDM that a malfunction has occurred. The SDM will respond by disabling the instrument panel (I/P) module deployment loop, and then sets DTC B0081 while commanding the AIR BAG indicator ON to notify the driver of a PPS malfunction. The DTCs that the PPS set are non GMLAN and have to be retrieved through the SDM. The procedures below are designed to assist in the retrieval of these codes. Before you start, read these procedures carefully and completely. For further information regarding the PPS refer to SIR System Description and Operation .

PPS Displaying Code Procedure

1. Empty the front outboard passenger seat.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF, and wait for the PPS to complete its bulb check function.
4. With the scan tool, request the passenger presence system (PPS) DTCs. The scan tool will command the SDM to send a message to the PPS, which will initiate the DTC retrieval process. (This process will take about 13 seconds).
5. When the PPS receives a request for DTCs, the PPS will illuminate both PASSENGER AIR BAG ON and OFF indicators located on the IPC for 3 seconds. If the PPS does not turn ON both indicators within 20 seconds of the request for PPS DTCs, then repeat step 4.
6. After the passenger AIR BAG ON and OFF indicators have illuminated for 3 seconds, cycle the ignition OFF for 3 seconds then turn the ignition back ON.
7. After the PPS receives this request for data from the SDM, it will transmit the DTC data through the SDM to the scan tool. This data is only accessible for one ignition cycle, do not turn OFF the ignition while displaying PPS DTCs.
8. The scan tool will then show any current or history DTCs. Refer to the «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/chevy-express-h1500/2003-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) to diagnose the DTC you have obtained.

Scan Tool Data List

The SIR Scan Tool Data List contains all the restraint system related parameters that are available on the scan tool. The parameters in the list are arranged in alphabetical order. The column, "Data List," indicates the location of the parameter within the scan tool menu selections.

Use the SIR Scan Tool Data List as directed by a diagnostic table or to supplement the diagnostic procedures. Begin all of the diagnostic procedures with the Diagnostic System Check - Vehicle. Refer to the Diagnostic System Check - Vehicle . Use the SIR Scan Tool Data List after determining the following

1. There is no published DTC procedure nor published symptom procedure for the customer concern.
2. The DTC or symptom diagnostic procedure indicated by the diagnostic system check does not resolve the customer concern.

The Typical Data Values are obtained from a properly operating vehicle under the conditions specified in the first row of the Scan Tool Data List table. Comparison of the parameter values from the suspect vehicle with the Typical Data Values may reveal the source of the customer concern.

SIR Scan Tool Data List

Scan Tool Data Definitions

The SIR scan tool data definitions contain a brief description of all SIR related parameters available on the scan tool. The parameters that are available on the scan tool are listed below in alphabetical order.

Circuit Description

The inflatable restraint passenger presence system (PPS) is used to monitor the pressure profile of any occupant that is sitting in the front outboard passenger seat and communicate the profile classification to the sensing and diagnostic module (SDM). The SDM will either enable or suppress the deployment of the instrument panel (I/P) module based on the profile classification of the occupant. If the PPS detects that the vehicle voltage is too low or high the PPS will then set a DTC within the PPS, then the PPS will communicate to the SDM through a non class 2 communications circuit that a PPS fault is present. The SDM will then set DTC B0092 indicating a problem within the PPS.

DTC Descriptors

This diagnostic procedure supports the following DTCs

1. DTC 1049 PPS System Fault
2. DTC 1050 PPS System Fault

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The PPS has detected supply battery voltage too low or too high.

Action Taken When the DTC Sets

1. The PPS will set a DTC then communicate with the SDM via non class 2 circuit.
2. The SDM will set DTC B0092.
3. The SDM disables the I/P module deployment loop.
4. The SDM commands the AIR BAG indicator ON via class 2 serial data.

Diagnostic Aids

DTC 1049 is an indication that the supply battery voltage (ignition 1) to the PPS too low and could be from corrosion and DTC 1050 is an indication that the supply battery voltage (ignition 1) to the PPS too high. The following are possible causes of the malfunction

1. A malfunctioning charging system
2. High resistance in the PPS ignition 1 circuit
3. The PPS connector
4. A malfunctioning PPS

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 2: Inspect to see if DTC 1050 is set indicating that the supply battery voltage is too high.
2. 3: Inspect to see if DTC 1049 is set indicating that the supply battery voltage is too low.
3. 6: This step tests the PPS ignition 1 for high resistance or short to ground.

DTC 1049-1050

The inflatable restraint passenger presence system (PPS) is used to monitor the pressure profile of any occupant that is sitting in the front outboard passenger seat and communicate the profile classification to the sensing and diagnostic module (SDM). The SDM will either enable or suppress the deployment of the instrument panel (I/P) module based on the profile classification of the occupant. If the PPS has been replaced the new PPS must run a preload test on the completed serviced seat before that vehicle is released back to the customer. This test assures that completed serviced seat does not add any pressure to the seat surface that could influence the pressure profile of any occupant that is sitting in the seat. This test must be performed on an empty seat. When a new PPS is installed a DTC will set indicating that a preload test needs to be preformed. If the PPS detects any preload DTC within the PPS, then the PPS will communicate to the SDM through a non class 2 communications circuit that a PPS fault is present. The SDM will then set DTC B0092 indicating a problem within the PPS.

DTC Descriptor

This diagnostic procedure supports the following DTC

DTC 1051 PPS Initialization/Preload Fault

Ignition 1 voltage is within the normal operating voltage range.

The PPS will set a DTC when replaced.

1. The PPS will set a DTC then communicate with the SDM via non Class 2 circuit.
2. The SDM will set DTC B0092.
3. The SDM disables the I/P module deployment loop.
4. The SDM commands the AIR BAG indicator ON via Class 2 serial data.

Conditions for Clearing the DTC

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

When a new PPS and seat bottom foam has been installed, a DTC 1051 will be set indicating that the preload test procedure must be run.

The number below refers to the step number on the diagnostic table.

1. 2: Inspect to see if DTC 1051 is set.

DTC 1051

The passenger presence system (PPS) is divided up into 6 regions. When there is an unwanted force being applied to one or more PPS regions, the PPS will set a diagnostic trouble code (DTC). If the PPS detects any preload DTC within the PPS, then the PPS will communicate to the SDM through a non class 2 communications circuit that a PPS fault is present. The SDM will then set DTC B0092 indicating a problem within the PPS.

This diagnostic procedure supports the following DTCs

1. DTC 1052 PPS Preload Failure Region 1
2. DTC 1053 PPS Preload Failure Region 2
3. DTC 1054 PPS Preload Failure Region 3
4. DTC 1055 PPS Preload Failure Region 4
5. DTC 1056 PPS Preload Failure Region 5
6. DTC 1057 PPS Preload Failure Region 6

Ignition 1 voltage is within the normal operating voltage range.

The PPS will set a DTC when a region has detected a preload/pressure on it, refer to the table below for specific region.

DTC 1052, 1053, 1054, 1055, 1056, or 1057

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1. The PPS will set a DTC then communicate with the SDM via non Class 2 circuit.
2. The SDM will set DTC B0092.
3. The SDM disables the instrument panel (I/P) module deployment loop.
4. The SDM commands the AIR BAG indicator ON via Class 2 serial data.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

When passenger seat bottom trim cover is serviced or removed, the trim cover, when reinstalled may apply certain unwanted pressure to the PPS causing DTC 1052-1057 to set.

DTC 1052, 1053, 1054, 1055, 1056, or 1057

The inflatable restraint passenger presence system (PPS) is used to monitor the pressure profile of any occupant that is sitting in the front outboard passenger seat and communicate the profile classification to the sensing and diagnostic module (SDM). The SDM will either enable or suppress the deployment of the instrument panel (I/P) module based on the profile classification of the occupant. If the PPS detects that a malfunction with the communication circuit then the PPS will then set a DTC within the PPS. The SDM will then set DTC B0092 indicating a problem within the PPS.

This diagnostic procedure supports the following DTCs

1. DTC 1058 PPS Communication Fault
2. DTC 1059 PPS Communication Fault
3. DTC 1060 PPS Communication Fault
4. DTC 1061 PPS Communication Fault
5. DTC 1062 PPS Communication Fault

Ignition 1 voltage is within the normal operating voltage range.

The PPS has never established or lost communications with the SDM.

1. The PPS will set a DTC.
2. The SDM will set DTC B0092.
3. The SDM disables the I/P module deployment loop.
4. The SDM commands the AIR BAG indicator ON via Class 2 serial data.

This DTC is an indication that the communication circuit between the SDM and the PPS has problems. The following are possible causes of the malfunction

1. An open, short to voltage, or high resistance in the communication circuit between the SDM and the PPS
2. The PPS connector
3. The SDM connector
4. A malfunctioning PPS
5. A malfunctioning SDM

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

The numbers below refer to the step numbers on the diagnostic table.

1. 3: This step inspects the PPS and the vehicle wiring harness for damage or corrosion.
2. 5: This step inspects the SDM and the vehicle wiring harness for damage or corrosion.
3. 7: This step tests the PPS communication circuit between the SDM and the PPS for an open, or high resistance, or a short to voltage.

DTC 1058-1062

The inflatable restraint passenger presence system (PPS) is used to monitor the pressure profile of any occupant that is sitting in the front outboard passenger seat and communicate the profile classification to the sensing and diagnostic module (SDM). The SDM will either enable or suppress the deployment of the instrument panel (I/P) module based on the profile classification of the occupant. If the PPS detects this DTC within the PPS, then the PPS will communicate to the SDM through a non class 2 communications circuit that a PPS fault is present. The SDM will then set DTC B0092 indicating a problem within the PPS.

This diagnostic procedure supports the following DTC

DTC 1063 Discard System

Ignition 1 voltage is within the normal operating voltage range.

The PPS has detected an internal fault and must be replaced.

1. The PPS will set a DTC then communicate with the SDM via non class 2 circuit.
2. The SDM will set DTC B0092.
3. The SDM disables the I/P module deployment loop.
4. The SDM commands the AIR BAG indicator ON via class 2 serial data.

When this DTC 1063 is set indicating that a new PPS must be installed.

The number below refers to the step number on the diagnostic table.

1. 2: Inspect to see if DTC 1063 is set.

DTC 1063

The inflatable restraint passenger presence system (PPS) is used to monitor the pressure profile of any occupant that is sitting in the front outboard passenger seat and communicate the profile classification to the sensing and diagnostic module (SDM). The SDM will either enable or suppress the deployment of the instrument panel (I/P) module based on the profile classification of the occupant. If the PPS detects this DTC within the PPS, then the PPS will communicate to the SDM through a non class 2 communications circuit that a PPS fault is present. The SDM will then set DTC B0092 indicating a problem within the PPS.

This diagnostic procedure supports the following DTCs

1. DTC 2036 Internal Electronic Performance 2
2. DTC 2037 Internal Electronic Performance 2
3. DTC 2038 Internal Electronic Performance 2
4. DTC 2039 Internal Electronic Performance 2
5. DTC 2040 Internal Electronic Performance 2
6. DTC 2041 Internal Electronic Performance 2
7. DTC 2042 Internal Electronic Performance 2
8. DTC 2043 Internal Electronic Performance 2
9. DTC 2044 Internal Electronic Performance 2
10. DTC 2045 Internal Electronic Performance 2

Ignition 1 voltage is within the normal operating voltage range.

The PPS has detected an internal fault and must be replaced.

1. The PPS will set a DTC then communicate with the SDM via non class 2 circuit.
2. The SDM will set DTC B0092.
3. The SDM disables the I/P module deployment loop.
4. The SDM commands the AIR BAG indicator ON via class 2 serial data.

When this DTC sets a new PPS must be installed.

The number below refers to the step number on the diagnostic table.

1. 2: Inspect to see if DTCs 2036-2045 are set.

DTC 2036-2045

The inflatable restraint passenger presence system (PPS) is used to monitor the pressure profile of any occupant that is sitting in the front outboard passenger seat and communicate the profile classification to the sensing and diagnostic module (SDM). The SDM will either enable or suppress the deployment of the instrument panel (I/P) module based on the profile classification of the occupant. If the PPS detects this DTC within the PPS, then the PPS will communicate to the SDM through a non class 2 communications circuit that a PPS fault is present. The SDM will then set DTC B0092 indicating a problem within the PPS.

This diagnostic procedure supports the following DTCs

1. DTC 3011 Internal Electronic Performance 1
2. DTC 3012 Internal Electronic Performance 1
3. DTC 3013 Internal Electronic Performance 1
4. DTC 3014 Internal Electronic Performance 1
5. DTC 3015 Internal Electronic Performance 1
6. DTC 3016 Internal Electronic Performance 1
7. DTC 3017 Internal Electronic Performance 1
8. DTC 3018 Internal Electronic Performance 1
9. DTC 3019 Internal Electronic Performance 1
10. DTC 3020 Internal Electronic Performance 1
11. DTC 3021 Internal Electronic Performance 1
12. DTC 3022 Internal Electronic Performance 1
13. DTC 3023 Internal Electronic Performance 1
14. DTC 3024 Internal Electronic Performance 1
15. DTC 3025 Internal Electronic Performance 1
16. DTC 3026 Internal Electronic Performance 1
17. DTC 3027 Internal Electronic Performance 1
18. DTC 3028 Internal Electronic Performance 1
19. DTC 3029 Internal Electronic Performance 1
20. DTC 3030 Internal Electronic Performance 1
21. DTC 3031 Internal Electronic Performance 1
22. DTC 3032 Internal Electronic Performance 1
23. DTC 3033 Internal Electronic Performance 1
24. DTC 3034 Internal Electronic Performance 1
25. DTC 3035 Internal Electronic Performance 1

Ignition 1 voltage is within the normal operating voltage range.

The PPS has detected an internal fault.

1. The PPS will set a DTC then communicate with the SDM via non class 2 circuit.
2. The SDM will set DTC B0092.
3. The SDM disables the I/P module deployment loop.
4. The SDM commands the AIR BAG indicator ON via class 2 serial data.

When this DTC sets the PPS has detected a internal malfunction.

The number below refers to the step number on the diagnostic table.

1. 2: Inspect to see if DTCs 3011-3035 are set.

DTC 3011-3035

The following diagnostics are designed to diagnose circuit failures for both single stage and dual stage air bag systems. The light duty G/H models are equipped with dual stage air bags and the heavy duty G/H models are equipped with single stage air bags. The inflatable restraint instrument panel (I/P) module deployment loop consists of an I/P module, I/P module high control, and I/P module low control circuits. There are shorting bars used within the I/P module connector which will short together the I/P module high and I/P module low control circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a diagnostic trouble code (DTC) will be stored in memory.

This diagnostic procedure supports the following DTCs

1. DTC B0012 RF/Passenger Frontal Deployment Loop (Stage 2) Resistance Low
2. DTC B0013 RF/Passenger Frontal Deployment Loop (Stage 2) Open
3. DTC B0014 RF/Passenger Frontal Deployment Loop (Stage 2) Voltage Out of Range
4. DTC B0016 Passenger Frontal Deployment Loop Resistance Low
5. DTC B0017 Passenger Frontal Deployment Loop Open
6. DTC B0018 Passenger Frontal Deployment Loop Voltage Out of Range

Ignition 1 voltage is within the normal operating voltage range.

1. DTC B0012 - stage 2 or B0016 - stage 1 will set when the SDM detects the I/P module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
2. DTC B0013 - stage 2 or B0017 - stage 1 will set when one of the following conditions occurs: The SDM detects the I/P module deployment loop resistance is greater than 4.8 ohms for 500 milliseconds. The SDM detects the voltage at I/P module high control is less than 2.4 volts and I/P module deployment loop resistance is 6 ohms or greater for 500 milliseconds.
3. DTC B0014 - stage 2 or B0018 - stage 1 will set when one of the following conditions occurs: The SDM detects the voltage at I/P module high control is shorted to ground or voltage for 500 milliseconds. The SDM detects the voltage at I/P module high control is less than 2.4 volts and I/P module deployment loop resistance is less than 6 ohms for 500 milliseconds.

The SDM commands the AIR BAG indicator ON via class 2 serial data.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

The following can cause an intermittent condition

1. A short between the I/P module high and low control circuits
2. An open or a high resistance in the I/P module high or low control circuits
3. A malfunctioning shorting bar on the I/P module connector

Refer to Testing for Intermittent Conditions and Poor Connections .

The numbers below refer to the step numbers on the diagnostic table.

1. 2: This step inspects the I/P module in-line connector.
2. 4: This step tests for a malfunctioning I/P module.
3. 6: This step tests for current DTCs. If DTC B0012 or B0016 is present, test for a short between the I/P module high and I/P module low control circuits for stage 1 or stage 2. If DTC B0013 or B0017 is present, test for an open or high resistance in the I/P module high and I/P module low control circuits for stage 1 or stage 2. If DTC B0014 or B0018 is present, test for a short to ground or voltage in the I/P module high and I/P module low control circuits for stage 1 or stage 2.

DTC B0012, B0013, B0014, B0016, B0017, or B0018

The following diagnostics are designed to diagnose circuit failures for both single stage and dual stage air bag systems. The light duty G/H models are equipped with dual stage air bags and the heavy duty G/H models are equipped with single stage air bags. The inflatable restraint steering wheel module deployment loop consists of a steering wheel module, steering wheel module coil, steering wheel module high control, and steering wheel module low control circuits. There are shorting bars used within the steering wheel module coil connector which will short together the steering wheel module high and steering wheel module low control circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a diagnostic trouble code (DTC) will be stored in memory.

This diagnostic procedure supports the following DTCs

1. DTC B0022 Driver Frontal Deployment Loop Resistance Low
2. DTC B0024 Driver Frontal Deployment Loop Voltage Out of Range
3. DTC B0026 Driver Frontal Deployment Loop Open
4. DTC B0042 LF/Driver Frontal Deployment (Stage 2) Resistance Low
5. DTC B0043 LF/Driver Frontal Deployment (Stage 2) Voltage Out of Range
6. DTC B0044 LF/Driver Frontal Deployment (Stage 2) Open

Ignition 1 voltage is within the normal operating voltage range.

1. DTC B0022 - stage 1 or B0042 - stage 2 will set when the steering wheel module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
2. DTC B0024 - stage 1 or B0043 - stage 2 will set when one of the following conditions occur: The SDM detects the voltage at steering wheel module high control is shorted to ground or voltage for 500 milliseconds. The SDM detects the voltage at steering wheel module high control is less than 2.4 volts and steering wheel module deployment loop resistance is less than 6 ohms for 500 milliseconds.
3. DTC B0026 - stage 1 or B0044 - stage 2 will set when one of the following conditions occurs: The SDM detects the steering wheel module deployment loop resistance is greater than 4.8 ohms for 500 milliseconds. The SDM detects the voltage at steering wheel module high control is less than 2.4 volts and steering wheel module deployment loop resistance is 6 ohms or greater for 500 milliseconds.

The SDM commands the AIR BAG indicator ON via Class 2 serial data.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

The following can cause an intermittent condition

1. A short between the steering wheel module high and low control circuits
2. An open or a high resistance in the steering wheel module high or low control circuits
3. A malfunctioning shorting bar on the steering wheel module coil connector

Refer to Testing for Intermittent Conditions and Poor Connections .

The numbers below refer to the step numbers on the diagnostic table.

1. 2: This step inspects the steering wheel module coil in-line connector.
2. 5: This step tests for a malfunctioning steering wheel module or steering wheel module coil.
3. 7: This step tests for current DTCs. If DTC B0022 or B0042 is present, test for a short between the steering wheel module high and steering wheel module low control circuits for stage 1 or stage 2. If DTC B0024 or B0043 is present, test for a short to ground or voltage in the steering wheel module high and steering wheel module low control circuits for stage 1 or stage 2. If DTC B0026 or B0044 is present, test for an open or high resistance in the steering wheel module high and steering wheel module low control circuits for stage 1 or stage 2.

DTC B0022, B0024, B0026, B0042, B0043, or B0044

The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts changes in vehicle velocity to an electrical signal. The SDM compares this 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 inflator modules, deploying the air bags and causing DTC B0051 to set.

This DTC is set when the SDM has commanded an air bag deployment with no faults present.

This diagnostic procedure supports the following DTC

DTC B0051 Deployment Commanded

The SDM must be powered up.

Ignition voltage must be present and the SDM must have commanded an air bag deployment.

1. The SDM commands ON the AIR BAG warning lamp via class 2 serial data.
2. The SDM records crash data.

DTC B0051 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the following diagnostic table.

DTC B0051

The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts changes in vehicle velocity to an electrical signal. The SDM compares this 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 inflator modules, deploying the air bags. DTC B0053 will set instead of DTC B0051 when a deployment occurs while an inflator circuit fault is present that may result in a non-deployment situation in one or more of the inflator modules.

This diagnostic procedure supports the following DTC

DTC B0053 Deployment Commanded with Loop DTCs Present

The SDM must be powered up.

Ignition voltage must be present and the SDM must have commanded an air bag deployment with loop faults.

1. The SDM commands ON the AIR BAG warning lamp via class 2 serial data.
2. The SDM records crash data.

DTC B0053 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the following diagnostic table.

When DTC B0053 is accompanied by additional DTCs (other than B0051), repair the malfunction causing the other DTCs before replacing the SDM.

DTC B0053

The passenger seat belt pretensioner deployment loop consists of a seat belt pretensioner-RF and the seat belt pretensioner-RF high and low circuits. A shorting bar used within the seat belt pretensioner connector shorts together both the seat belt pretensioner high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the pretensioner during servicing. 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 seat belt pretensioner. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a diagnostic trouble code (DTC) will be stored in memory.

This diagnostic procedure supports the following DTCs

1. DTC B0057 Right Front/Passenger Pretensioner Deployment Loop Resistance Low
2. DTC B0058 Right Front/Passenger Pretensioner Deployment Loop Open
3. DTC B0059 Right Front/Passenger Pretensioner Deployment Loop Voltage Out of Range

Ignition 1 voltage is within the normal operating voltage range.

1. DTC B0057 will set when the seat belt pretensioner-RF deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
2. DTC B0058 will set when one of the following conditions occurs: Seat belt pretensioner-RF high circuit is less than 2.4 volts and the seat belt pretensioner-RF deployment loop is more than 6 ohms for 500 milliseconds. Seat belt pretensioner-RF deployment loop resistance is more than 4.8 ohms for 500 milliseconds.
3. DTC B0059 when one of the following conditions occur: Seat belt pretensioner-RF high or low circuits is short to ground or short to voltage for 500 milliseconds. Seat belt pretensioner-RF high circuit is less than 2.4 volts and seat belt pretensioner-RF deployment loop resistance is less than 6 ohms for 500 milliseconds.

The SDM commands the AIR BAG indicator ON via class 2 serial data.

1. The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
2. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

The following are possible causes of the malfunction

1. A short between the seat belt pretensioner-RF high and low circuits
2. An open or a high resistance in the seat belt pretensioner-RF high or low circuits
3. A short to ground or a short to voltage in the seat belt pretensioner-RF high or low circuits
4. The seat belt pretensioner-RF connector
5. The SDM connector
6. A malfunctioning seat belt pretensioner
7. A malfunctioning SDM

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

The numbers below refer to the step number on the diagnostic table.

1. 4: Tests to see if the malfunction is caused by the seat belt pretensioner-RF.
2. 6: Tests to see what DTCs are present.

DTC B0057, B0058, or B0059

The driver seat belt pretensioner deployment loop consists of a seat belt pretensioner - LF and the seat belt pretensioner - LF high and low circuits. A shorting bar used within the seat belt pretensioner connector shorts together both the seat belt pretensioner high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the pretensioner during servicing. 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 seat belt pretensioner. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a diagnostic trouble code (DTC) will be stored in memory.

This diagnostic procedure supports the following DTCs

1. DTC B0064 Left Front/Driver Pretensioner Deployment Loop Resistance Low
2. DTC B0065 Left Front/Driver Pretensioner Deployment Loop Open
3. DTC B0066 Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range

Ignition 1 voltage is within the normal operating voltage range.

1. DTC B0064 will set when the seat belt pretensioner - LF deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
2. DTC B0065 will set when one of the following conditions occurs: Seat belt pretensioner - LF high circuit is less than 2.4 volts and the seat belt pretensioner - LF deployment loop is more than 6 ohms for 500 milliseconds. Seat belt pretensioner - LF deployment loop resistance is more than 4.8 ohms for 500 milliseconds.
3. DTC B0066 will set when one of the following conditions occur: Seat belt pretensioner - LF high or low circuits is short to ground or short to voltage for 500 milliseconds. Seat belt pretensioner - LF high circuit is less than 2.4 volts and seat belt pretensioner - LF deployment loop resistance is less than 6 ohms for 500 milliseconds.

The SDM commands the AIR BAG indicator ON via class 2 serial data.

1. The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
2. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

The following are possible causes of the malfunction

1. A short between the seat belt pretensioner - LF high and low circuits
2. An open or a high resistance in the seat belt pretensioner - LF high or low circuits
3. A short to ground or a short to voltage in the seat belt pretensioner - LF high or low circuits
4. The seat belt pretensioner - LF connector
5. The SDM connector
6. A malfunctioning seat belt pretensioner
7. A malfunctioning SDM

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

The numbers below refer to the step numbers on the diagnostic table.

1. 4: This step tests to see if the malfunction is caused by the seat belt pretensioner - LF.
2. 6: This step tests to see what DTCs are present.

DTC B0064, B0065, or B0066

The inflatable restraint seat position sensor (SPS) is used to determine the proximity of a front driver or passenger seat 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 seat track of both the driver and passenger seats. The seat track includes a metal bracket that shunts the SPS magnetic circuit creating 2 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 codes B0083 or B0084 and defaults to disabling stage 2 frontal deployment. This will only default on the side of the vehicle the sensor has a fault. Its important to understand that the SPS is secondary to the passenger presence system (PPS) and the manual instrument panel module (IPM) disable switch. If either one of these devices are in the disable mode the passenger air bag will not deploy regardless of the SPS status.

This diagnostic procedure supports the following DTCs

1. DTC B0083 Right Front/Passenger Seat Position Sensor Circuit
2. DTC B0084 Left Front/Driver Seat Position Sensor Circuit

Ignition 1 voltage is within the normal operating voltage range.

DTC B0083 and B0084 will set when one of the following conditions occur

1. The SDM detects the SPS circuit amperage is 4 mA or less for 500 milliseconds.
2. The SDM detects the SPS circuit amperage is between 8-11 mA for 500 milliseconds.
3. The SDM detects the SPS circuit amperage is 18 mA or greater for 500 milliseconds.

1. The SDM commands the AIR BAG indicator ON via class 2 serial data.
2. The SDM defaults the SPS to seat forward threshold.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

The following can cause an intermittent condition

1. A short between the SPS signal and low reference circuits
2. High or low resistance in the SPS signal and low reference circuits
3. Inspect the SPS signal and return circuits carefully for cutting and/or chafing

Refer to Testing for Intermittent Conditions and Poor Connections .

The numbers below refer to the step numbers on the diagnostic table

1. 2: This step inspects the SPS connector and terminals.
2. 6: This step tests for a short to ground, a high resistance, or an open in the SPS signal circuit.
3. 7: This step tests for a short to ground, a high resistance, or an open in the SPS low reference circuit.
4. 8: This step tests for a short to voltage in the SPS signal and low reference circuits.

DTC B0083 or B0084

The inflatable restraint instrument panel module (IPM) disable switch circuit consists of an IPM disable switch, IPM disable switch indicator, IPM disable switch signal circuit, and IPM suppression indicator control circuit. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM monitors the voltage levels at the IPM disable switch signal and the IPM suppression indicator control circuits of the SDM to determine the position of the IPM disable switch. If a malfunction is detected, a DTC will be stored in memory.

This diagnostic procedure supports the following DTC

DTC B0090 Active Switch Voltage Out of Range

Ignition 1 voltage is within the normal operating voltage range.

The voltage at IPM disable switch signal and IPM suppression indicator control is low or high with the IPM disable switch indicator OFF for 500 milliseconds.

1. The IPM disable switch is defaulted to a calibration state.
2. The SDM commands ON the AIR BAG indicator via class 2 serial data.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

The following can cause an intermittent condition

A short between the IPM disable switch signal and IPM suppression indicator control circuits. Refer to Testing for Intermittent Conditions and Poor Connections .

The numbers below refer to the step numbers on the diagnostic table

1. 5: This step tests for an open or high resistance in the IPM disable switch power feed circuit.
2. 6: This step tests for an open or high resistance in the IPM disable switch ground circuit.
3. 8: This step tests for an open or high resistance in the IPM disable switch signal circuit.
4. 9: This step tests for a short in the IPM disable switch signal circuit.
5. 10: This step tests for short in the IPM suppression indicator control circuit.
6. 11: This step tests for an open or high resistance in the IPM suppression indicator control circuit.

DTC B0090

The inflatable restraint instrument panel module (IPM) disable switch circuit consists of an IPM disable switch, IPM disable switch indicator, IPM disable switch signal circuit, and IPM suppression indicator control circuit. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM monitors the voltage levels at the IPM disable switch signal and the IPM suppression indicator control circuits of the SDM to determine the position of the IPM disable switch. If a malfunction is detected, a DTC will be stored in memory.

This diagnostic procedure supports the following DTC

DTC B0091 Active Switch: Wrong State

Ignition 1 voltage is within the normal operating voltage range.

The voltage at IPM disable switch signal is low with the IPM disable switch indicator ON and the voltage at IPM suppression indicator control is high for 500 milliseconds.

1. The IPM disable switch is defaulted to a calibrated state.
2. The SDM commands ON the AIR BAG indicator via class 2 serial data.
3. The SDM toggles the IPM disable switch AIR BAG indicator ON and OFF every 5 seconds.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

The following can cause an intermittent condition

A short between the IPM disable switch signal and the IPM suppression indicator control circuits. Refer to Testing for Intermittent Conditions and Poor Connections .

The numbers below refer to the step numbers on the diagnostic table.

1. 3: This step observes the state of the IPM disable switch, normal state being ON.
2. 4: This step tests for a malfunctioning IPM disable switch.
3. 5: This step tests for a malfunctioning SDM.
4. 6: This step tests for a short in the IPM disable switch signal circuit.
5. 7: This step tests for a short in the IPM suppression indicator control circuit.

DTC B0091

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. When the SDM has completed the power-up mode the SDM will establish communication with the passenger presence system (PPS). The PPS will respond by commanding both the PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. Then, the SDM will transmit a request message to the PPS to receive the PPS verification ID. The PPS will transmit the verification ID to the SDM and the SDM will compare the ID received to data stored in memory. The SDM will set DTC B0092 to notify the driver that the PPS has a current malfunction present or has not established/loss communications with the PPS.

This diagnostic procedure supports the following DTC

DTC B0092 Passenger Presence System Performance

Ignition 1 voltage is within the normal operating voltage range.

1. The SDM has loss or never established communications with the PPS.
2. The SDM detects that the PPS has set a DTC.

1. The SDM disables the instrument panel (I/P) module deployment loop.
2. The SDM commands the AIR BAG indicator ON via Class 2 serial data.
3. The PPS will turn ON the PASSENGER AIR BAG OFF indicator.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

DTC B0092 is an indication that the SDM has no or loss communication with the PPS or the PPS has internal faults. The SDM will continue to request the verification ID from the PPS for 5 seconds. If the SDM does not receive the verification ID from the PPS within 5 seconds the SDM will set the DTC as current, illuminate the AIR BAG indicator, and disable the I/P module deployment loop.

The numbers below refer to the step numbers in the diagnostic table

1. 2: This test checks the PPS for DTC 1063.
2. 3: This test checks the PPS for any current or history DTCs.
3. 6: This test checks the PPS data communications circuit for an open or high resistance.

DTC B0092

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. When the SDM has completed the power-up mode, the SDM will establish communication with the passenger presence system (PPS). The PPS will respond by commanding both of the PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. The SDM will then transmit a request message to the PPS to receive the PPS verification ID. The PPS will transmit the verification ID to the SDM, and the SDM will compare the ID received to data stored in memory. If the data stored in memory does not match the information transmitted by the PPS, the SDM will set DTC B0098 and command the AIR BAG indicator ON.

This diagnostic procedure supports the following DTC

DTC B0098 Passenger Presence System Configuration Error

Ignition 1 voltage is within the normal operating voltage range.

The SDM has received an incorrect PPS verification ID.

1. The SDM disables the instrument panel (I/P) module deployment loop.
2. The SDM commands the AIR BAG indicator ON via class 2 serial data.
3. The PPS will turn ON the PASSENGER AIR BAG OFF indicator.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

DTC B0098 is an indication that the SDM has received an incorrect PPS verification ID. The SDM will continue to request the verification ID from the PPS for 5 seconds. If the SDM does not receive the correct verification ID from the PPS within 5 seconds, the SDM will set DTC B0098 as current, illuminate the AIR BAG indicator. If either the SDM or PPS were replaced verify that the correct part numbers were used for the vehicle application.

The numbers below refer to the step numbers in the diagnostic table

1. 3: Inspect the PPS to verify the correct part number was installed in the vehicle.
2. 5: Inspect the SDM to verify the correct part number was installed in the vehicle.

DTC B0098

The inflatable restraint front end sensor also known as the electronic frontal sensor (EFS) 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 resets the front end sensor twice by removing and reapplying power. If the fault is still present, the SDM will set a diagnostic trouble code (DTC).

This diagnostic procedure supports the following DTCs

1. DTC B0100 Electronic Front End Sensor 1 Performance
2. DTC B0101 Discard Electronic Front End Sensor 1
3. DTC B0102 Incorrect Electronic Front End Sensor 1 Installed

Ignition 1 voltage is within the normal operating voltage range.

1. DTC B0100 will set when one of the following conditions occur: A valid ID message is not received within 5 seconds of the front end sensor being powered up. Status message is not received. The SDM has failed twice to reset the front end sensor.
2. DTC B0101 will set when the SDM has received 4 consecutive NOK (Not OK) messages from the front end sensor.
3. DTC B0102 will set when one of the following conditions occur: The SDM has received an ID message from the front end sensor which does not match the ID stored in the SDM memory. When two front end sensor resets are attempted without the correct identification being detected by the SDM.

1. The SDM commands the AIR BAG indicator ON via Class 2 serial data.
2. The SDM attempts to reset the front end sensor.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction free ignition cycles have occurred.

The following can cause an intermittent condition

1. A short between the front end sensor signal and low reference circuits
2. High or low resistance in the front end sensor signal and low reference circuits
3. Inspect the front end sensor signal and low reference circuits carefully for cutting and/or chafing
4. Verify that the correct front end sensor is installed in the vehicle

Refer to Testing for Intermittent Conditions and Poor Connections .

The numbers below refer to the step numbers on the diagnostic table

1. 2: Tests the communication status of the front end sensor.
2. 6: Tests for a short to ground, a high resistance, or an open in the front end sensor signal circuit.
3. 7: Tests for a short to ground, a high resistance, or an open in the front end sensor low reference circuit.
4. 8: Tests for a short to voltage in the front end sensor signal and low reference circuits.

DTC B0100, B0101, or B0102

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) compares the restraints ID stored in the SDM to the restraints ID stored in the body control module (BCM). The restraints ID being compared contains the last 4 digits of the SDM part number. For more detailed information concerning class 2 serial data lines, refer to Data Link Communications Description and Operation .

This diagnostic procedure supports the following DTC

DTC B1001 Option Configuration Error

Ignition 1 voltage is within the normal operating voltage range.

1. The SDM disables all AIR BAG deployments.
2. The SDM commands the AIR BAG indicator ON via class 2 serial data.

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 255 malfunction free ignition cycles have occurred.

DTC B1001 is an indication that the restraints ID stored in both the BCM and SDM do not match. If either the BCM or powertrain control module (PCM) were replaced, the replacement modules need to be reprogrammed for proper operation. In addition, if the BCM or SDM were replaced, the vehicle theft deterrent (VTD) system will also need to be reprogrammed.

The numbers below refer to the step numbers on the diagnostic table.

1. 2: This step checks to see if the correct VIN is programmed in the PCM.
2. 3: This step explains the proper steps to perform after a PCM has been replaced in order for the PCM to operate properly.
3. 5: This step explains the proper steps to perform after a BCM has been replaced in order for the BCM to operate properly.
4. 8: This step explains how to properly program the VTD system.

DTC B1001

Introduction

The passenger presence system (PPS) is a calibrated system that requires checking for preloads within each region when the system has been serviced or replaced. If the passenger seat bottom cushion or seat bottom trim has been serviced, reinstalled, or removed for any reason, the procedure below was designed to assist in checking for preloads 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 .

Passenger Presence System Preload Test Procedure

1. Empty the front outboard passenger seat.
2. Install a scan tool.
3. Use the scan tool in order to clear the SIR and PPS DTCs, if any current codes are set except preload DTCs, service that DTC first.
4. With the scan tool command the Preload Passenger Presence System procedure.
5. Use the scan tool to request the PPS codes. Refer to «Passenger Presence System Displaying Code Procedure»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) .
6. If DTC 1052-1057 is present, refer to «DTC 1052, 1053, 1054, 1055, 1056, or 1057»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) for repair.
7. When no preload DTCs are found in the PPS then clear all history DTCs in both the PPS and the SIR system.
8. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/chevy-express-h1500/2003-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) after all repairs.

Symptoms - SIR

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the SIR system. Refer to «Checking Aftermarket Accessories»(/chevrolet/chevy-express-h1500/2003-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-troubleshooting-diagnosis__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 Air Bag Indicator Circuit Malfunction in order to diagnose the symptom.

Refer to Passenger Presence System Indicator Circuit Malfunction in order to diagnose the symptom.

When the ignition is turned ON, the instrument panel cluster (IPC) flashes the AIR BAG indicator seven times. The inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within the SIR system. If no SIR system malfunctions exists, the SDM will request the IPC to turn the AIR BAG indicator OFF after it has flashed 7 times. The AIR BAG indicator is controlled by the SDM via class 2 serial data.

1. If ignition 1 voltage is outside of the normal operating voltage range (9-16 volts), the AIR BAG indicator will come ON solid with no DTCs set.
2. The loss of serial data communication between the SDM and the instrument panel cluster (IPC) will cause the AIR BAG indicator to come ON solid. Refer to «DTC U1001-U1254»(/chevrolet/chevy-express-h1500/2003-2012/remont/communication-devices/#data-communication-system) .

The numbers below refer to the step numbers on the diagnostic table.

1. 3: This step determines if ignition 1 voltage to the SDM is more than 9 volts.
2. 4: This step determines if ignition 1 voltage to the SDM is more than 16 volts.
3. 5: This step tests for an open or high resistance in the ignition 1 voltage circuit between the SDM and the SIR fuse.
4. 6: This step tests for an open or high resistance in the ignition 1 voltage circuit that feeds the SIR fuse.
5. 7: This step tests for an open or high resistance in the SDM ground circuit.

Air Bag Indicator Circuit Malfunction

The PASSENGER AIR BAG ON/OFF indicators, located in the center of instrument panel cluster (IPC), are used to notify the driver when the passenger presence system (PPS) has enabled or disabled the I/P inflator module. When the ignition is turned ON, the PPS module is supplied with voltage and commands both PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds, then the PPS module conducts tests on the PPS components and circuits while both PASSENGER AIR BAG 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 SDM that a DTC has been set. The SDM will request the IPC to turn the AIR BAG indicator ON to notify the driver of a PPS malfunction.

The following are possible causes of the malfunction

1. A short in the passenger air bag OFF indicator control circuit
2. A short in the passenger air bag ON indicator control circuit
3. An open or high resistance in the passenger air bag OFF indicator control circuit
4. An open or high resistance in the passenger air bag ON indicator control circuit

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

The numbers below refer to the step numbers on the diagnostic table.

1. 4: Tests the Passenger AIR BAG ON/OFF indicator ignition 1 voltage circuit for a short to ground, high resistance, or an open.
2. 5: Tests the passenger air bag OFF indicator control circuit for a short to ground, a high resistance, or an open.
3. 6: Tests the passenger air bag ON indicator control circuit for a short to ground, a high resistance, or an open.
4. 7: Tests the PPS module for proper operation.

Passenger Presence System Indicator Circuit Malfunction

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 Disabling and Enabling

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 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 feet) or greater

1. Inflatable restraint sensing and diagnostic module (SDM)
2. Any Inflatable restraint air bag module
3. Inflatable restraint steering wheel module coil
4. Any Inflatable restraint sensor
5. Inflatable restraint seat belt pretensioners
6. Inflatable restraint Passenger Presence System (PPS) module or 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»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) or «Electrical Center Identification Views»(/chevrolet/chevy-express-h1500/2003-2012/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-power-ground-and-splice-pack-connector-end-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»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) or «Electrical Center Identification Views»(/chevrolet/chevy-express-h1500/2003-2012/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-power-ground-and-splice-pack-connector-end-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»(/chevrolet/chevy-express-h1500/2003-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) .

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»(/chevrolet/chevy-express-h1500/2003-2012/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»(/chevrolet/chevy-express-h1500/2003-2012/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»(/chevrolet/chevy-express-h1500/2003-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) .

Removal Procedure

1. Disable the SIR. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .
2. Raise the vehicle and support. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/chevy-express-h1500/2003-2012/remont/hoistjack/#general-information) .
3. Remove the Connector Position Assurance (CPA) from the inflatable restraint front end discriminating sensor electrical connector.
4. Disconnect the inflatable restraint front end sensor electrical connector.
5. Loosen the inflatable restraint front end sensor mounting nut (1).
6. Slide the inflatable restraint front end sensor (1) towards the front of the vehicle.
7. Remove the sensor (1) from the keyhole slot in the lower radiator support (2).

Installation Procedure

1. Remove any dirt, grease, or other impurities from the mounting surface.
2. Point the arrow on the sensor toward the front of the vehicle.
3. Install the inflatable restraint front end sensor (1) into the keyhole slot in lower radiator support (2).
4. Push the sensor towards the rear of the vehicle to seat the sensor in the keyhole slot in the lower radiator support (2). Tighten: Tighten the nut (1) to 10 N.m (89 lb in).
5. Connect the inflatable restraint front end sensor electrical connector.
6. Install the CP to the electrical connector.
7. Remove the safety stands and lower the vehicle.
8. Enable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .

1. Disable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .
2. Remove the driver seat. Refer to «Seat Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
3. Fold back the carpet to access the inflatable restraint sensing and diagnostic module (SDM).
4. Remove the connector position assurance (CPA) from the SDM electrical connector.
5. Disconnect the SDM electrical connector.
6. Remove the SDM (2) mounting nuts (1).
7. Remove the SDM (2) from the vehicle.
8. Repair the studs using the following procedure: Remove and discard the stripped nut. Drill out the weld spots for the weld stud that has been damaged, remove and discard the damaged stud. Condition the floor panel attaching surface where the new stud is to be installed. Install new weld stud GM P/N 115115602 and clamp the weld stud into place. Migweld the stud at the drilled holes. Apply body sealer GM P/N 9984248 around any exposed openings. Install a new nut (1) GM P/N 11515933.

1. Remove any dirt, grease, or other impurities from the mounting surface.
2. Install the SDM (2) horizontally to the studs.
3. Point the arrow on the SDM toward the front of the vehicle.
4. Install the SDM mounting nuts (1). Tighten: Tighten the nuts (1) to 10 N.m (89 lb in).
5. Install the SDM (2) electrical connector.
6. Install the CPA to the SDM electrical connector.
7. Install the carpet to cover SDM (2).
8. Install the driver seat. Refer to «Seat Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
9. Enable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .
10. Refer to «Control Module References»(/chevrolet/chevy-express-h1500/2003-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for programming and setup information.

1. Disable the inflatable restraint steering wheel module. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .
2. Using a blunt-ended tool, push the leaf spring fasteners (2) inward through the access holes. The access holes are located on both sides of the steering wheel shroud.
3. Lift and partially remove the inflatable restraint steering wheel module from the steering wheel in order to expose the electrical connectors.
4. Disconnect the connector-position assurance (CPA) retainers from the electrical connectors.
5. Disconnect the electrical connectors from the inflatable restraint steering wheel module.
6. Remove the inflatable restraint module from the steering wheel.
7. Fully deploy the module before disposal. If the module was replaced under warranty, fully deploy and dispose of the module after the required retention period. Refer to «Inflator Module Handling and Scrapping»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) .

1. Position the inflatable restraint module to the steering wheel.
2. Connect the electrical connectors to the inflatable restraint steering wheel module.
3. Connect the CPA retainers into the electrical connectors. Seat and lock the connections.
4. Position the alignment posts of the inflatable restraint module to the holes that are located on the steering wheel housing.
5. Push the inflatable restraint module into the steering wheel in order to engage and in order to latch the 2 leaf spring fasteners (1).
6. After installation, pull the sides of the inflatable restraint module in order to ensure that both leaf spring fasteners are engaged.
7. Enable the inflatable restraint steering wheel module. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .

Tools Required

J 42640 Steering Column Anti Rotation Pin. See Special Tools .

1. Disable the SIR System. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .
2. Verify the following before removing the SIR coil: The wheels on the vehicle are straight ahead. That J 42640 is installed or the ignition switch is in the LOCK position. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) .
3. Remove the steering wheel from the steering shaft. Refer to «Steering Wheel Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/steering-column-switches/#steering-wheel-steering-column) .
4. On vehicles with a tilt column, pull the tilt lever straight out from the steering column.
5. Remove 2 TORX® head screws (1) from the lower trim cover (2).
6. Remove the lower trim cover (2).
7. Remove 2 TORX® head screws (2) from the upper trim cover (1).
8. Remove the upper trim cover (1).
9. Remove the wire harness straps from the steering wheel column wire harness.
10. Remove the retaining ring (3).
11. Remove the SIR coil (4) from the steering shaft.
12. If replacing, discard the SIR coil.

1. Verify the following: The wheels on the vehicle are straight ahead. That J 42640 is installed or the ignition switch is in the LOCK position. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) .
2. If reusing the existing coil it MUST be centered, refer to «Inflatable Restraint Steering Wheel Module Coil Centering»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__inflatable-restraint-steering-wheel-module-coil) .
3. Align the SIR coil assembly (1) with the horn tower on the turn signal cancel cam assembly (2).
4. Slide the SIR coil (4) onto the steering shaft assembly (2).
5. Firmly seat the retaining ring (3) into the groove on the steering shaft assembly (2).
6. Remove and discard the centering tab from the new SIR coil (4).
7. Install the upper trim cover (1) and secure by using 2 TORX® head screws (2). Tighten: Tighten the screws to 1.5 N.m (13 lb in).
8. Install the lower trim cover (2) and secure by using 2 TORX® head screws (1).
9. Verify that the tabs on the lower trim cover (1) engage with the tabs on the upper trim cover (2). Snap the tabs together. Tighten: Tighten the screws to 1.5 N.m (13 lb in).
10. On vehicles with a tilt column, align the tilt lever into the steering column.
11. Slide the tilt lever handle into the steering column until the handle locks into position.
12. Install the steering wheel onto the steering shaft. Refer to «Steering Wheel Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/steering-column-switches/#steering-wheel-steering-column) .
13. Enable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .

Inflatable Restraint Steering Wheel Module Coil Centering

1. Verify the following conditions before centering the SIR coil: The wheels on the vehicle are straight ahead. 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. If the front (5) of the SIR coil has a centering window (4), and the back side (2) includes a spring service lock (1), perform the following steps: Hold the SIR coil with the face up. While depressing the spring service lock, rotate the coil hub clockwise until the coil ribbon stops. Rotate the coil hub slowly, counterclockwise, until the centering window appears yellow and both arrows (3) line up. Release spring service lock between the locking tab. The SIR coil is now centered. Align the centered SIR coil with the horn tower and slide onto the steering shaft assembly.
3. If the front (4) of the SIR coil has a centering window (3), and the back side (1) includes NO spring service lock, perform the following steps: Hold the SIR coil with the face up. Rotate the coil hub clockwise until the coil ribbon stops. Rotate the coil hub slowly, counterclockwise until the centering window appears yellow and both arrows (2) line up. This is the CENTER position. While holding the coil hub in the CENTER position, align the SIR coil with the horn tower and slide onto the steering shaft assembly.
4. If the front side (3) of the SIR coil has NO centering window, but the back side (2) includes a spring service lock (1), perform the following steps: Hold the SIR coil with the back side up. While depressing the spring service lock, rotate the coil hub in the direction of the arrow (4) until the coil ribbon stops. Still pressing the spring service lock, rotate the coil hub in the opposite direction 21/2 revolutions. Release the spring service lock between locking tabs. The SIR coil is now centered. Align the centered SIR coil with the horn tower and slide onto the steering shaft assembly.
5. If the front side (2) of the SIR coil has NO centering window, and the back side (1) includes NO spring service lock, perform the following steps: Hold the SIR coil with the face up. Rotate the coil hub in the direction of the arrow until the coil ribbon stops. Rotate the coil hub, slowly, counterclockwise, for 21/2 revolutions. This is the CENTER position. While maintaining the coil hub in the CENTER position, align the centered SIR coil with the horn tower and slide onto the steering shaft assembly.
6. If double wire harness strap is installed onto the wire harness assembly and 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 leads to the steering column.

1. Disable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .
2. Remove the right knee bolster bracket. Refer to «Passenger Knee Bolster Bracket Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
3. Remove the passenger instrument panel (I/P) trim pad. Refer to «Instrument Panel Trim Pad Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
4. Remove the body control module. Refer to «Body Control Module Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/communication-devices/#data-communication-system) .
5. Remove the connector position assurance (CPA) from the harness connector on the inflatable restraint I/P module.
6. Disconnect the I/P module electrical connector (1).
7. Remove the upper bolts (3) from the I/P module (1).
8. Remove the lower bolts (2) from the I/P module (1).
9. Remove the I/P module (1).
10. Ensure that the I/P module is fully deployed before disposal. If the module was replaced under warranty, fully deploy and dispose of the module after the required retention period. Refer to «Inflator Module Handling and Scrapping»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) .

1. Install the inflatable restraint I/P module (1) to the I/P carrier.
2. Install the lower bolts (2) hand tight.
3. Install the lower bolts (3) to the inflatable restraint I/P module. Tighten: Tighten the bolts to 10 N.m (89 lb in).
4. Install the right knee bolster bracket. Refer to «Passenger Knee Bolster Bracket Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
5. Install the passenger I/P trim pad. Refer to «Instrument Panel Trim Pad Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
6. Connect the electrical connector (1) to the inflatable restraint I/P module.
7. Install the CPA to the I/P module electrical connector.
8. Install the body control module. Refer to «Body Control Module Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/communication-devices/#data-communication-system) .
9. Enable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .

1. Remove the seat from the vehicle. Refer to «Seat Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
2. Disconnect the electrical connector from the seat position sensor.
3. Drill out the rivets that retain the seat position sensor (1) to the seat adjuster track bracket.
4. Remove the seat position sensor from the seat adjuster track bracket.

1. Install the seat position sensor to the seat adjuster bracket.
2. Install the rivets that retain the seat position sensor (1) to the seat adjuster track bracket.
3. Connect the electrical connector to the seat position sensor.
4. Install the passenger seat to the vehicle. Refer to «Seat Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/seats/#seat-hardware-seat-trim-and-upholstery) .

Scheme 25

Inflatable Restraint Passenger Presence System Replacement - Front

Scheme 26

Instrument Panel Inflatable Restraint Module Indicator Replacement

1. Disable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .
2. Remove the I/P cluster trim plate. Refer to «Instrument Panel Cluster Trim Plate Bezel Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
3. Release the passenger AIR BAG disable switch (1) locking tabs.
4. Remove the switch (1) from the I/P accessory trim panel.
5. Disconnect the passenger AIR BAG disable switch electrical connection (2).

1. Install the I/P cluster trim plate. Refer to «Instrument Panel Cluster Trim Plate Bezel Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
2. Connect the electrical connector (2) to the passenger AIR BAG disable switch (1).
3. Install the switch (1) to the instrument panel cluster trim bezel.
4. Enable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .

1. Disable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .
2. Lift the buckle cover.
3. Remove the seat belt buckle pretensioner retaining bolt from the seat.
4. Disconnect the electrical connector from the seat belt buckle pretensioner, if equipped.
5. Remove the seat belt buckle pretensioner from the seat.

1. Install the seat belt buckle pretensioner to the seat.
2. Connect the electrical connector to the seat belt buckle pretensioner, if equipped.
3. Lift the buckle cover.
4. Install the seat belt buckle pretensioner retaining bolt to the seat. Tighten: Tighten the seat belt buckle pretensioner retaining bolt to 52 N.m (38 lb ft).
5. Enable the SIR system. Refer to «SIR Disabling and Enabling»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__sir-disabling-and-enabling) .

Accident With or Without Air Bag 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. Steering column-Perform the steering column accident damage checking procedures. Refer to «Steering Column Accident Damage Inspection»(/chevrolet/chevy-express-h1500/2003-2012/remont/steering-column-switches/#steering-wheel-steering-column) .
2. I/P Knee Bolsters and Mounting Points-Inspect the knee bolsters for bending, twisting, buckling, or any other type of damage.
3. I/P brackets, braces, etc.-Inspect for bending, twisting, buckling, or any other type of damage.
4. Seat Belts-Perform the seat belt operational and functional checks. Refer to «Operational and Functional Checks»(/chevrolet/chevy-express-h1500/2003-2012/remont/restraints-control-systems/#seat-belt-system__operational-and-functional-checks) .
5. Seats and Seat Mounting Points-Inspect for bending, twisting, buckling, or any other type of damage.
6. Passenger seat bottom equipped with Passenger Presence System (PPS) - Check for any DTCs or problems that may cause the PPS to not function properly.

Accident With Frontal Air Bag Deployment - Component Replacement and Inspections

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

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

After a collision involving frontal air bag deployment, inspect the steering wheel module coil and the coil wiring pigtail for melting, scorching, or other damage due to excessive heat. Perform this component inspection in addition to the inspections indicated above in Accident With or Without Air Bag Deployment. 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.

Sensor Replacement Guidelines

The SIR 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. For example, a moderate collision where the front of the vehicle impacts a tree. If the vehicle has an SIR sensor mounted forward of the radiator, it must be replaced.

1. Replace the sensor whether or not the air bags have deployed.
2. Replace the sensor even if it 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 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 (Undeployed) Inflator Module

Scheme 27

Use special care when handling or storing live, undeployed, inflator modules. 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 Modules

Dual stage inflator modules have two deployment stages. If stage 1 was used to deploy the 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 deployed or undeployed dual stage module is required both deployment loops must be energized to deploy the air bag.

Scrapping Procedure

During the course of a vehicle's useful life, certain situations may arise which will require the disposal of a live, undeployed, inflator module. Do not dispose of a live, undeployed, inflator module through normal disposal channels until the inflator module has been deployed. The following information covers the proper procedures for disposing of a live, undeployed, inflator module.

Do not deploy an 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. When a vehicle is the subject of a product liability report, 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

Inflator modules 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 - I/P Module and Steering Wheel 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, if equipped, 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.

Tools Required

1. J 38826 SIR Deployment Harness. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) .
2. J 39401-B SIR Deployment Fixture. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) .
3. J 38826-75 Steering wheel module adapter
4. J 38826-80 I/P module adapter

1. Turn OFF the ignition.
2. Remove the ignition key.
3. Put on safety glasses.
4. Remove the inflator module. Refer to the following: When removing the steering wheel module, refer to «Inflatable Restraint Steering Wheel Module Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) . When removing the I/P module, refer to «Inflatable Restraint Instrument Panel Module Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) .
5. Place the inflator module with the vinyl trim cover facing up and away from the surface on a work bench, floor or deployment fixture.
6. Clear an area on the floor approximately 1.85 m (6 ft) in diameter for deployment of the inflator module. If possible, use a paved, outdoor location free of activity. Otherwise, use an area 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. When deploying a steering wheel module, place the steering wheel module in the center of the cleared area.
9. When deploying an I/P module, refer to the following instructions: Place the J 39401-B (2) in the center of the cleared area. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) . Fill the deployment fixture (2) with water or sand. Mount the I/P module (1) in the deployment fixture (2) with the vinyl/plastic trim facing up. To mount, use 4 M 6 bolts (6), nuts (8), and washers (7) to properly secure the I/P module (1) to the deployment fixture (2). Tighten all fasteners prior to deployment.
10. Inspect the J 38826 and the appropriate pigtail adapter for damage. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) . Replace as needed.
11. Short the 2 SIR deployment harness leads (1) together using one banana plug seated into the other.
12. Connect the appropriate pigtail adapter (2) to the SIR deployment harness (1).
13. Extend the SIR deployment harness and adapter to full length from the deployment fixture.
14. Connect the inflator module (1) to the adapter (2) on the SIR deployment harness (3).
15. Clear the area of people.
16. Separate the 2 banana plugs on the SIR deployment harness.
17. Place a 12 V minimum/2 A minimum power source, i.e. vehicle battery, near the shorted end of the SIR deployment harness.
18. Connect the SIR deployment harness wires to the power source. Inflator module deployment will occur when contact is made.
19. Disconnect the SIR deployment harness from the power source.
20. Seat 1 banana plug into the other in order to short the deployment harness leads.
21. If the inflator module did not deploy, disconnect the adapter and discontinue the procedure. Contact the Technical Assistance Group for further assistance. Otherwise, proceed to the following steps.
22. Put on a pair of shop gloves.
23. Disconnect the pigtail adapter from the inflator module as soon as possible.
24. Dispose of the deployed inflator module through normal refuse channels.
25. Wash hands with a mild soap.

Deployment Inside Vehicle - Vehicle Scrapping Procedures

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 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 inflatable restraint steering wheel module connector (2) located to the left of the steering column.
6. Cut the steering wheel module 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 gage) or thicker multi-strand wire. Use these wires to fabricate the 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 inflator module.
11. Twist together two connector wire leads, the high circuits from both stages of the steering wheel module, to one set of deployment wires. Refer to «SIR Connector End Views»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) in order to determine the correct circuits.
12. Inspect that the connection is secure.
13. Bend flat the twisted connection.
14. Secure and insulate the connection using electrical tape.
15. Twist together two connector wire leads, the low circuits from both stages of the steering wheel module, to one set of deployment wires. Refer to «SIR Connector End Views»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) in order to determine the correct circuits.
16. Inspect that the connection is secure.
17. Bend flat the twisted connection.
18. Secure and insulate the connection using electrical tape.
19. Connect the deployment harness to the steering wheel module connector.
20. Route the deployment harness out of the vehicle's driver side.
21. Disconnect the inflatable restraint I/P module connector (1) located under the instrument panel extension (3).
22. Cut the I/P module harness connector out of the vehicle, leaving at least 16 cm (6 in) of wire at the connector.
23. Strip 13 mm (0.5 in) of insulation from each of the connector wire leads.
24. Cut two 6.1 m (20 ft) deployment wires from a 0.8 mm (18 gage) or thicker multi-strand wire. These wires will be used to fabricate the deployment harness.
25. Strip 13 mm (0.5 in) of insulation from both ends of the wires cut in the previous step.
26. Twist together one end from each of the wires in order to short the wires.
27. Twist together two connector wire leads, the high circuits from both stages of the I/P module, to one set of deployment wires. Refer to «SIR Connector End Views»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) in order to determine the correct circuits.
28. Inspect that the connection is secure.
29. Bend flat the twisted connection.
30. Secure and insulate the connection using electrical tape.
31. Twist together two connector wire leads, the low circuits from both stages of the I/P module, to one set of deployment wires. Refer to «SIR Connector End Views»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) in order to determine the correct circuits.
32. Inspect that the connection is secure.
33. Bend flat the twisted connection.
34. Secure and insulate the connection using electrical tape.
35. Connect the deployment harness to the I/P module connector.
36. Route the deployment harness out of the vehicle's passenger side.
37. Stretch the driver side deployment harnesses to full length.
38. Stretch the passenger side deployment harnesses to full length.
39. Completely cover the windshield and front door window openings with a drop cloth.
40. Place a power source, 12 V minimum/2 A minimum, i.e. vehicle battery, near the shorted ends of the passenger side deployment harnesses.
41. Separate the ends of the I/P module deployment harness wires.
42. Connect the I/P module deployment harness wires to the power source in order to deploy the I/P module.
43. Disconnect the I/P module deployment harness wires from the power source.
44. Twist together one end of each wire of the I/P module on the passenger side deployment harness in order to short the wires.
45. Move the power source, 12 V minimum/2 A minimum, i.e., a vehicle battery, near the shorted ends of the driver side deployment harnesses.
46. Separate the ends of the steering wheel module deployment harness wires.
47. Connect the steering wheel module deployment harness wires to the power source in order to deploy the steering wheel module.
48. Disconnect the steering wheel module deployment harness wires from the power source.
49. Twist together one end of each wire of the steering wheel module on the driver side deployment harness in order to short the wires.
50. Remove the drop cloth from the vehicle.
51. Disconnect all harnesses from the vehicle.
52. Discard the harnesses.
53. Scrap the vehicle in the same manner as a non-SIR equipped vehicle.
54. If one or more of the inflator modules did not deploy, perform the following steps to remove the undeployed modules from the vehicle: «Inflatable Restraint Steering Wheel Module Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) «Inflatable Restraint Instrument Panel Module Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system)
55. Contact the Technical Assistance Group for further assistance.

Pretensioner Handling and Scrapping

During the course of a vehicle's 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.

Tools Required

1. J 39401-B SIR Deployment Fixture. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) .
2. J 38826 SIR Deployment Harness. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) .
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 Buckle Pretensioner Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) .
5. When carrying a seat belt pretensioner to the deployment area, keep the open end of the seat belt pretensioner pointed away from the body.
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 SIR Deployment Fixture in the center of the cleared area. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) .
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 (3). See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) . 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 (4). Securely tighten all fasteners prior to deployment.
11. Inspect the J 38826 SIR Deployment Harness and the appropriate pigtail adapter for damage. See «Special Tools»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system__special-tools) . Replace as needed.
12. Short the two SIR deployment harness (1) leads 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 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. IMPORTANT: When deploying a seat belt pretensioner, the rapid expansion of gas is very loud. Notify the people in the immediate area that a seat belt pretensioner will be deployed.
17. Separate the two banana plugs on the SIR deployment harness.
18. Place a 12 V minimum/2 A 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.

Deployment Inside Vehicle - Vehicle Scrapping Procedure

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 - LF connector. Refer to «Seat Belt Buckle Pretensioner Replacement»(/chevrolet/chevy-express-h1500/2003-2012/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 gage) or thicker multi-strand wire. These wires will be used for the seat belt pretensioner - LF 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 - LF connector (3).
17. Route the deployment harness out of the driver side of the vehicle.
18. Disconnect the seat belt pretensioner - RF connector. Refer to «Seat Belt Buckle Pretensioner Replacement»(/chevrolet/chevy-express-h1500/2003-2012/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 gage) or thicker multi-strand wire. These wires will be used for the seat belt pretensioner - RF 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 - RF connector (3).
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 V minimum/2 A 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, refer to «Seat Belt Buckle Pretensioner Replacement»(/chevrolet/chevy-express-h1500/2003-2012/remont/airbag/#supplemental-inflatable-restraint-system) to remove the undeployed seat belt pretensioner from the vehicle.
43. Call the Technical Assistance Group for further assistance.

Scheme 28

The supplemental inflatable restraint (SIR) system supplements the protection offered by the occupant's 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. 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 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 sensor
4. Inflatable restraint PASSENGER AIR BAG ON/OFF indicator located on the instrument panel
5. Inflatable restraint Passenger Presence System (PPS)
6. Inflatable restraint I/P module
7. Inflatable restraint I/P module disable switch
8. Inflatable restraint seat position sensors (SPS) (left/right)
9. Inflatable restraint sensing and diagnostic module (SDM)
10. Inflatable restraint steering wheel module
11. Inflatable restraint steering wheel module coil
12. Inflatable restraint wiring harnesses
13. Seat belt pretensioners (left/right)
14. 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 sensor 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 instrument panel cluster (IPC) to turn the AIR BAG indicator ON. The SDM, I/P module, steering wheel module, steering wheel module coil, seat belt pretensioners 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.

Inflatable Restraint Sensing and Diagnostic Module (SDM)

The sensing and diagnostic module (SDM) is a microprocessor and the control center for the 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 ignition 1 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 indicators. 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 indicators located on the instrument panel. The PPS monitors itself for faults and will set flash diagnostic trouble codes (DTCs) if a fault is detected. The PPS will also notify the SDM of a fault and the SDM will request the instrument panel cluster (IPC) to turn ON the AIR BAG indicator located on the IPC. To determine what DTCs have been set by the PPS, the Tech 2 is used to command the SDM to request the PPS to flash the DTCs using the PASSENGER AIR BAG ON/OFF indicators located on the instrument panel.

Inflatable Restraint Seat Position Sensors (SPS)

The seat position sensor (SPS) is used to determine the proximity of a front driver or passenger seat position with respect to the frontal air bag. The SPS interfaces with the 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 seat track of both the driver and passenger seats. 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 two current ranges, one range for the shunted state and a second range for a non-shunted state. These two states are inputs to the sensing and diagnostic module (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 codes B0083 or B0084 and defaults to disabling stage 2 frontal deployment. This will only default on the side of the vehicle the sensor has a fault. It's important to understand that the SPS is secondary to the manual I/P module disable switch. If the I/P module disable switch is in the disable mode the passenger air bag will not deploy regardless of the SPS status.

AIR BAG Indicator

The AIR BAG indicator, located on the instrument panel cluster (IPC) is used to notify the driver of SIR system malfunctions and to verify that the SDM is communicating with the IPC. When the ignition is turned ON, the SDM is supplied with ignition 1 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 class 2 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 Indicators

The PASSENGER AIR BAG ON/OFF indicators located on the instrument panel are 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 PPS module is supplied with ignition 1 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 B0092 or B0098 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.

Single Stage Inflator Modules (Heavy Duty)

Single stage inflator modules contain a housing, inflatable air bag, initiating device, canister of gas generating material and, in some cases, stored compressed gas. The initiator is part of the inflator module deployment loop. When the vehicle is involved in a collision of sufficient force, the 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 inflator module is equipped with a shorting bar located on the connector 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.

Dual Stage Inflator Modules (Light Duty)

Dual stage inflator modules contain a housing, inflatable air bag, two initiating devices, canister of gas generating material and, in some cases, stored compressed gas. The two initiators are part of the inflator module deployment loop. The inflator modules have two 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 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 connector(s) 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 two 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 Sensor

The front end sensor is equipped on vehicles to supplement the SIR system performance. The front end sensor is electronic and is not part of the deployment loops, but instead provides input to the SDM. The front end sensor can assist in determining the severity of some frontal collisions. The SDM uses the input from the front end sensor 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 I/P Module Disable Switch (Heavy Duty)

The instrument panel (I/P) module disable switch is a manual 2-position key switch located inside the vehicle. The I/P module disable switch allows the vehicle operator the ability to enable or disable the I/P module (passenger frontal air bag). The vehicle operator must disable the I/P module if a rear-facing child seat is installed in the front passenger seat. The I/P module disable switch interfaces with the sensing and diagnostic module (SDM) to request the enabling or disabling of the I/P module. The occupants are notified of the enabling or disabling of the I/P module via the I/P module disable switch ON/OFF indicators located on the I/P module disable switch.

Inflatable Restraint Wiring Harnesses

The wiring harnesses connect the sensing and diagnostic module (SDM), inflator modules, front end sensor, seat belt pretensioners, seat position sensors (SPS), and the class 2 serial data circuit together using weather pack connectors. SIR system connectors are yellow in color for easy identification. When repairing 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 buckle, 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. The seat belt pretensioner 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.

Special Tools

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

Scheme 29

See also:
• Diagnostic System Check - Vehicle
• Diagnostic Trouble Code (DTC) List - Vehicle
• Testing for Intermittent Conditions and Poor Connections
• Connector Repairs
• Circuit Testing
• Wiring Repairs
• Control Module References
• Power Seat Connector End Views
• Data Link Communications Description and Operation
• Body Control Module Programming and Setup
• Programming Immobilizer System Components
• Checking Aftermarket Accessories
• Instrument Cluster Replacement
• Electrical Center Identification Views
• Battery Negative Cable Disconnection and Connection
• Lifting and Jacking the Vehicle
• FASTENER NOTICE
• SIR Inflator Module Handling and Storage Caution
• Seat Replacement
• SIR Caution
• Steering Wheel Replacement
• Passenger Knee Bolster Bracket Replacement
• Fastener Tightening Specifications
• Operational and Functional Checks
• SIR Inflator Module Disposal Caution
• SIR Deployed Inflator Modules Are Hot Caution
• SIR Inflatable Module Deployment Outside Vehicle Caution
• SIR Seatbelt Pretensioner Handling Caution
• SIR Disabling and Enabling
• DTC B0012, B0013, B0014, B0016, B0017, or B0018
• Special Tools
• SIR Identification Views
• Inflatable Restraint Steering Wheel Module Coil Centering