B1530

DTC B1530

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC B1530
- Discard Passenger Presence System 1

Diagnostic Fault Information





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 voltage is between 9-16 volts.

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 requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
* The SDM will lock out the malfunctioning PPS.

Conditions for Clearing the DTC

* The PPS has been replaced.
* The SDM has been replaced.

Diagnostic Aids

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 (Component Tests and General Diagnostics). If the PPS has any current DTC, address those DTC before performing this diagnostic procedure.


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

Reference Information
Schematic Reference

SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

SIR System Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.


* PPS module

* SDM

* PPS module wiring harness connector

* SDM wiring harness connector


1. Ignition ON, observe the function of the inflatable restraint passenger air bag ON and OFF indicators. The inflatable restraint passenger air bag ON and OFF indicators should illuminate.

• If the inflatable restraint passenger air bag ON/OFF status indicators do not illuminate refer to.

2. Ignition OFF, disconnect the harness connector at the PPS module.
3. Test for less than 1 ohm between the ground circuit terminal 5 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance

4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 9 and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

5. Disconnect the harness connector at the SDM.
6. Test for infinite resistance between the serial data link terminal 18 and ground.

• If less than the specified value, test the serial data link for a short to ground.

7. Test for less than 1 ohm between the PPS module serial data link terminal 18 and the SDM serial data link terminal 35.

• If greater than the specified range, test the serial data link for an open/high resistance.

8. Ignition ON, test for less than 1-volt between the PPS module serial data link terminal 18 and ground.

• If greater than the specified range, test the serial data link for a short to voltage.

9. If all circuits test normal, replace the PPS module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)
* Control Module References (Programming and Relearning) for SDM replacement, setup, and programming