For 1990-2009 cars

### 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 B1325 03: System Voltage Low Voltage
DTC B1325 07: System Voltage High Voltage

### Circuit/System Description

With the ignition in either the ACC or ON positions, the inflatable restraint sensing and diagnostic module (SDM) should receive a 12V power supply. DTC B1325 will set to indicate the B+ positive supplied to the SDM is below the threshold.

### Conditions for Setting the DTCs

This DTC runs continuously once the following condition is met:

The supplied power to the SDM is between 9 - 16V.

### Action Taken When the DTC Sets

A warning lamp will illuminate.

### Conditions for Clearing the DTC

• | The condition for setting the DTC is no longer present.

• | The DTC can be cleared using a scan tool.

### Reference Information

#### Schematic Reference

SIR Schematics

#### Connector End View Reference

Component Connector End Views

#### Scan Tool Reference

Control Module References

### Circuit/System Testing

1. Ignition OFF, wait for 30 seconds, and then disconnect the X1 harness connector at the SDM
2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 22 X1 and ground.

⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open high resistance.

3. If all circuits test normal, replace the SDM

### Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SDM replacement, setup, and programming