Hummer H3. Manual — part 572

Driver Side Belt Status

The scan tool displays Buckled or Unbuckled. The signal from the driver seat belt switch
indicates whether the driver seat is buckled or unbuckled.

Driver Side Impact Sensor ID

The scan tool displays a 2-digit ID number. The ID signal is sent to the SDM from the
Driver SIS.

Electronic Front End Sensor 1 ID

The scan tool displays a 2-digit ID number. The ID signal is sent to the SDM from the left
hand front end sensor.

Electronic Front End Sensor 2 ID

The scan tool displays a 2-digit ID number. The ID signal is sent to the SDM from the right
hand front end sensor.

Ignition Voltage

The scan tool displays 0-20 volts. The Ignition represents the system voltage measured by
the SDM at its ignition feed.

Julian Date of Build

The scan tool displays a 3 digit number. Which represents the day of the year the module
was built.

Passenger Side Belt Status

The scan tool displays Buckled or Unbuckled. The signal from the passenger seat belt switch
indicates whether the passenger seat is buckled or unbuckled.

Passenger Side Impact Sensor ID

The scan tool displays a 2-digit ID number. The ID signal is sent to the SDM from the
Passenger SIS.

ROM ID

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

The scan tool displays a 4-digit number. This number is the read-only memory (ROM) ID.

Year Module Built

The scan tool displays what year the module was built.

DTC 023

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 Descriptor

DTC 023

Seat Belt Tension Sensor Circuit Out of Range

Circuit/System Description

The inflatable restraint seat belt tension sensor is used to enhance the Passenger Presence System
(PPS) when an infant car seat is properly restrained on the front outboard passenger seat. The seat
belt tension sensor is a 3-wire potentiometer mounted on the lower seat belt anchor and provides
an input to the PPS module. When an infant car seat is properly restrained on the front passenger
seat, the seat belt is tightly secured through the infant car seat. The seat belt pulls on the tension
sensor and changes the voltage signal to the PPS module. The PPS module uses the voltage signal
to help determine if a tightly belted infant car seat is installed. The PPS uses the inputs from the
seat belt tension sensor and the PPS pressure sensor to determine if the instrument panel (I/P)
module should be suppressed or enabled. The PPS monitors the seat belt tension sensor circuits
and sets DTC 023 if a fault is detected.

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The PPS detects the voltage at the passenger seat belt tension sensor signal is less than 0.05
volt or greater than 4.5 volts for 500 milliseconds.

The PPS detects the voltage at the passenger seat belt tension sensor 5-volt reference is less

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

than 4.5 volts or greater than 9.1 volts for 500 milliseconds.

The PPS detects the amperage at the passenger seat belt tension sensor low reference is 25
mA or greater for 500 milliseconds.

Action Taken When the DTC Sets

The SDM disables the instrument panel (I/P) module deployment loop.

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

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

The scan tool CLEAR DTC command has been issued.

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

Diagnostic Aids

The following can cause an intermittent condition:

A short between the passenger seat belt tension sensor signal, 5-volt reference and low
reference circuits

An open or high resistance between the passenger seat belt tension sensor signal, 5-volt
reference and low reference circuits

Inspect the passenger seat belt tension sensor signal, 5-volt reference and low reference
circuits carefully for cutting and/or chafing.

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

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

Wiring Repairs

Circuit/System Testing

1. Ignition OFF. Inspect the PPS and seat belt tension sensor connectors for corrosion or

damage.

If the seat belt tension sensor terminals are damaged, replace the seat belt tension
sensor.

If any of the above conditions are found, make the appropriate repair.

2. Test the seat belt tension sensor signal and voltage circuits for a short to voltage, short to

ground or an open/high resistance.

If any of the above conditions are found, make the appropriate repair.

3. Ignition ON. Test the seat belt tension sensor 5-volt reference circuit for voltage.

If the sensor reference voltage is not 5 volts, replace the PPS.

4. Test the seat belt tension sensor signal circuit for voltage.

If the signal circuit voltage is not 0.05-4.5 volts, replace the seat belt tension sensor.

5. Ignition ON. Reconnect all components and with the scan tool clear DTC.

Recheck for DTC 023. Refer to Passenger Presence System Flash Code
Procedures. If DTC 023 does not set as current, perform the repair verification.

6. If DTC 023 does set as a current DTC, replace and rezero the PPS.

After replacement and rezeroing of the PPS are completed, perform the repair
verification.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Front Seat Belt Buckle Replacement

SIR/SRS Wiring Repairs

Control Module References for PPS replacement, setup and programming

DTC 024

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.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3