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
DTC B1325 4A: Device Power 1 Circuit Checksum Error
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | B1325 | B1325 | -- | -- |
Ground | -- | B1325 | -- | -- |
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.
B1325 4A
The instrument panel cluster (IPC) failed the power on checksum test, either due to low voltage or corrupted memory.
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.
- Engine running, observe the scan tool Battery Positive Voltage parameter in the data list of the module setting the DTC. The reading should be between 12.6 and 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 and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 Ω between the ground circuit(s) and ground:
- Ignition ON, verify a test lamp illuminates between the battery positive voltage circuit(s) and ground.
- If all the circuits test normal, replace the appropriate control module.
| ⇒ | If greater than the specified value, test the ground circuit(s) for an open/high resistance. |
| ⇒ | If not within the specified range, test the appropriate battery positive voltage 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.
