Hummer H3. Manual — part 573

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC 024

PPS Ignition 1 Voltage Performance

Circuit/System Description

The inflatable restraint passenger presence system (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 retractor 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 occupant's 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 DTCs if a fault is detected. The PPS will also notify
the SDM of a fault. The SDM will respond by setting either DTC B0092 or B0098 and
requesting the instrument panel cluster (IPC) to turn the AIR BAG indicator ON.

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The PPS detects ignition 1 voltage is less than 8 volts 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

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

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 in the ignition 1 voltage circuit between the PPS module and the body relay block

An open or high resistance in the ignition 1 voltage circuit between the PPS module and the
body relay block

The PPS will set DTC 024 when the ignition voltage has fallen below 8 volts. The PPS will set
DTC 024 as a history code only. This is a normal condition for DTC 024 and it should be
diagnosed as a current DTC.

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. Ignition OFF. Inspect the PPS and main seat harness connectors for corrosion or damage.

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

2. Test the PPS ground circuit for an open/high resistance.

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

3. Test the PPS ignition 1 voltage circuit for a short to ground or an open/high resistance.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

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

4. Reconnect all components, clear codes and recheck for DTC 024. Refer to Passenger

Presence System Flash Code Procedures. If DTC 024 resets, 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.

SIR/SRS Wiring Repairs

Control Module References for PPS replacement, setup and programming

DTC 063

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 063

PPS Out of Calibration

Circuit/System Description

The Inflatable Restraint Passenger Presence System (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 retractor 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 occupant's 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 occupant's weight is higher
than a specified value, the PPS module will send an enable signal to the SDM to enable the I/P

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

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 DTCs if a fault is detected. The PPS will also notify
the SDM of a fault. The SDM will respond by setting DTC B0092 and requesting the instrument
panel cluster (IPC) to turn the AIR BAG indicator ON. The PPS will set DTC 063 as an
indication that the PPS is out of calibration. The PPS is not capable of being calibrated at the
service level, the PPS must be replaced.

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The PPS detects ignition 1 voltage is less than 8 volts 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

DTC 063 is an indication that the PPS is out of calibration. You cannot recalibrate the PPS.
Replace the PPS after following the instructions in the diagnostic table below.

Diagnostic Aids

Refer to Passenger Presence System Flash Code Procedures for displaying flash codes.

The presence of current or history DTC while attempting to rezero the PPS will cause the
PPS module to set DTC 063. Verify that all SIR and PPS DTC have been cleared before
rezeroing the PPS.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Electrical Information Reference

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3