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 B1325 03: Device Power 1 Circuit Voltage Below ThresholdDTC B1325 07: Device Power 1 Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | B1325 03 | B1325 03 | -- | -- |
Ground | -- | B1325 03 | -- | -- |
Circuit/System Description
The control modules on this vehicle monitor the battery voltage through the battery positive voltage circuits. This vehicle has multiple modules that will set the DTC. For more information on which modules, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
Conditions for Running the DTC
| • | The voltages supplied to the control modules are in the range of 7-26 V. |
| • | The ignition is ON. |
| • | The engine is running. |
Conditions for Setting the DTC
B1325 03
The control module detects a system voltage below 9 V for 5 seconds.
B1325 07
The control module detects a system voltage above 18 V for 5 seconds.
Action Taken When the DTC Sets
| • | The control module immediately disables all outputs when an out of range voltage condition has been detected, with the exception of serial data and Run/Crank relay that are disabled after a 3 minute delay. |
| • | The setting of other DTCs is inhibited. |
Conditions for Clearing the DTC
The DTC clears when the malfunction is no longer present.
Diagnostic Aids
| • | A high or low voltage DTC set in multiple 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 modules indicates a concern in the charging system. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Charging System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.5-15.5 V.
| ⇒ | If the battery voltage is not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF. Disconnect the harness connectors of the module that set the DTC.
- Ignition OFF, test less than 3 Ω between the ground circuits and ground.
- Ignition ON, verify a test lamp illuminates between the B+ circuits and ground.
- If all the circuits test normal, replace the appropriate control module.
| ⇒ | If greater than specified range, test the ground circuits for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the appropriate B+ circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for the appropriate control module replacement, setup, and programming
