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Hummer H3. Manual - part 583

detected, the SIS 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 SIS continually
communicates status messages to the SDM, which determines if a fault is present in the SIS
circuit. When a fault is detected, the SDM resets the SIS twice by removing and reapplying
power. If the fault is still present, the SDM will set a diagnostic trouble code (DTC).

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B0077 and B0078

A valid ID message is not received within 5 seconds of the SIS being powered up.

Status message is not received.

The SDM has failed twice to reset the SIS.

B0079 and B0081

The SDM has received an ID message from the SIS that does not match the ID stored in the
SDM memory.

When two SIS resets are attempted without the correct identification being detected by the
SDM.

B0080 and B0082

Will set when the SDM has received a NOK (Not OK) message from the SIS.

Action Taken When the DTC Sets

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

The SDM attempts to reset the SIS.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

You issue a scan tool CLEAR DTC command.

A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

Diagnostic Aids

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

The following can cause an intermittent condition:

A short between the SIS signal and voltage circuits

High or low resistance in the SIS signal and voltage circuits

Inspect the SIS signal and voltage circuits carefully for cutting and/or chafing.

Verify that the correct SIS is installed in the vehicle.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Circuit/System Testing

1. With the ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0079,

B0080, B0081 or B0082 are current.

If DTC B0079, B0080, B0081 or B0082 are current, replace the malfunctioning SIS.

For DTCs B0079 and B0080 replace the left SIS.

For DTCs B0081 and B0082 replace the right SIS.

2. With the ignition ON, use a scan tool to observe the SIR DTC display. Verify DTC B0077

or B0078 are current.

Inspect and test wiring system components.

For DTC B0077 replace the left SIS.

For DTC B0078 replace the right SIS.

3. Verify DTC B0077, B0078, B0079, B0080, B0081 or B0082 are not current.

4. If DTC B0077, B0078, B0079, B0080, B0081 or B0082 reset as current, remove the SDM

connector. Inspect the SDM connector for damage or corrosion that may cause a

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

malfunction in the SIS circuits.

If damage or corrosion is found make the appropriate repair.

Replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Inflatable Restraint Side Impact Sensor Replacement

SIR/SRS Wiring Repairs

Control Module References for SDM replacement, setup and programming

DTC B0083 OR B0084

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0083

Right Front/Passenger Seat Position Sensor Circuit

DTC B0084

Left Front/Driver Seat Position Sensor Circuit

Diagnostic Fault Information

DTC B0083 or B0084

Circuit/System Description

Circuit

Short to

Ground

High

Resistance

Open

Short to

Voltage

Signal

Performance

Seat Position Sensor - Left
Circuit

B0084

Seat Position Sensor - Right
Circuit

B0083

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

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 near 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 (I/P) module
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.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

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

The SDM detects the SPS circuit amperage is 4 mA or less for 500 milliseconds.

The SDM detects the SPS circuit amperage is between 8-11 mA for 500 milliseconds.

The SDM detects the SPS circuit amperage is 18 mA or greater for 500 milliseconds.

Action Taken When the DTC Sets

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

The SDM defaults the SPS to seat forward threshold.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

You issue a scan tool CLEAR DTCs command.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

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