B1325

DTC B1325

Diagnostic Instructions

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



DTC Descriptors
DTC B1325 03
- Device Power 1 Circuit Voltage Below Threshold


DTC B1325 07
- Device Power 1 Circuit Voltage Above Threshold




Diagnostic Fault Information






Circuit/System Description

The sensing and diagnostic module (SDM) monitors the system voltage through the ignition voltage signal circuit. If the SDM senses that system voltage is outside of its normal range, DTC B1325 will set. Damage to components, and incorrect data may occur when the voltage is out of range.


Conditions for Running the DTC

* The voltage supplied to the SDM are in the range of 7-26 volts.
* The ignition is ON.
* The engine is running.



Conditions for Setting the DTC

B1325 03

The SDM detects a system voltage below the calibrated value usually 9 volts for 5 seconds.

B1325 07

The SDM detects a system voltage above the calibrated value usually 18 volts for 5 seconds.


Action Taken When the DTC Sets

* The SDM commands the AIR BAG indicator ON
* The SIR system is disabled and no deployments are allowed.



Conditions for Clearing the DTC

The DTC clears when the system voltage returns to a normal range.


Diagnostic Aids

* A high or low voltage DTC set in multiple control modules indicates a concern in the charging system.
* A possible cause of this DTC could be overcharging with a battery charger or jump starting.
* A high or low voltage value in multiple control modules indicates a concern in the charging system.



Reference Information
Schematic Reference

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

Component Connector End Views (Connector Views)
Description and Operation

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

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

1. Engine running measure and record the voltage at the battery terminals.
2. . Verify that the battery voltage is 12.6-15.5 volts.

• If the battery voltage is not within the specified range, refer to Charging System Test (Charging System Test)

3. Engine running, observe the scan tool SDM Battery Positive Voltage parameter.
4. Verify that the scan tool displays a value that is within 2 volts of the battery terminal voltage.



Circuit/System Testing

Caution: Refer to SIR Caution (SIR Caution) .
1. Ignition OFF. Disconnect the harness connectors at the SDM.
2. Verify that there is less than 3.0 ohms between the ground circuit X2 terminal 16 and ground

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

3. Ignition ON, verify a test lamp illuminates between the ignition 1 voltage circuit X2 terminal 29 and ground

• If test lamp did not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance.

4. If all the circuits test normal, replace the SDM.



Repair Instructions

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


Control Module References (Programming and Relearning) for SDM replacement, setup, and programming.