Hummer H3. Manual — part 587

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

SIR/SRS Wiring Repairs

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

DTC B1530

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 B1530

Discard Passenger Presence System 1

Circuit/System Description

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM)
performs tests to diagnose critical malfunctions within the Passenger Presence System (PPS).
When the SDM has completed the power-up mode, the SDM will establish communication with
the PPS. The SDM will increase a fault counter with each ignition cycle that a fault exists with
the PPS. The SDM will lock out the PPS after a predetermined ignition cycle count maximum
has been reached.

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The PPS has a current fault.

The PPS fault counter in the SDM has reached 127 counts.

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.

The SDM will lock out the malfunctioning PPS.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

Conditions for Clearing the DTC

The PPS has been replaced.

The SDM has been replaced.

Diagnostic Aids

Any repair performed on the original PPS will not clear DTC B1530.

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 a scan tool, check for DTC B0092 or DTC B0098 is a current DTC.

Diagnose DTC B0092 or DTC B0098 if set as a current DTC.

IMPORTANT: DTC B0092 or DTC B0098 will set if the PPS has a malfunction

and has set any one of the following DTCs 023, 024, 063, 064 or
065. When DTC B0092 or DTC B0098 is present, it is important to
check the PPS for any current DTC. Refer to Passenger Presence
System Flash Code Procedures. If the PPS has any current DTC,
address those DTC before performing this diagnostic procedure.

IMPORTANT: If the SDM has DTC B0092 or DTC B0098 stored as current, you

must address those DTCs before continuing with this diagnostic
procedure.

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

2. If the PPS has been replaced then DTC B1530 will automatically be cleared. If the PPS was

repaired and DTC B1530 is set as current, the SDM will have to be replaced.

Replace the SDM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

SIR/SRS Wiring Repairs

Control Module References for SDM replacement, setup and programming

DTC B3855, B3856 OR B3857

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 B3855

Rollover Sensor Performance

DTC B3856

Discard Rollover Sensor

DTC B3857

Incorrect Rollover Sensor Installed

Circuit/System Description

The inflatable restraint vehicle rollover sensor (ROS) utilizes battery power supply and a
bidirectional interface circuit. The ROS modulates current on the interface to send ID, State of
Health and deployment commands to the inflatable restraint sensing and diagnostic module
(SDM). When the ignition is turned on the ROS responds by performing internal diagnostics and
sending an ID to the SDM. The ROS continually communicates status messages to the SDM,
which determines if a fault is present in the ROS circuit. If the fault is present, the SDM will set a

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3

diagnostic trouble code (DTC).

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

B3855

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

A status message is not received.

B3856

The SDM has received a NOK message from the ROS.

A ROS internal fault exists for a 127 ignition cycles.

B3857

Will set when the SDM has received an ID message from the ROS that does not match the ID
stored in the SDM memory.

Action Taken When the DTC Sets

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

Conditions for Clearing the DTC

The DTC will clear when the condition responsible for setting the DTC no longer exists and
the scan tool Clear DTCs function is used.

A history DTC will clear once 250 malfunction-free ignition cycles have occurred.

Diagnostic Aids

The following are conditions that may cause the malfunction:

A short to ground or voltage in the ROS circuit

High or low resistance in the ROS circuit

Improper ROS installed on vehicle

Reference Information

Schematic Reference

2007 Hummer H3

2007 RESTRAINTS Supplemental Inflatable Restraints - H3