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: Voltage Below ThresholdDTC B1325 07: 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 monitor the 12 V battery voltage on the B+ circuits. The battery voltage must be within the normal range in order for the control modules to operate correctly. If the battery voltage is out of range, the control modules listed below will set DTC B1325.
| • | The IPC |
| • | The PPS |
| • | The Radio |
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
B1325 03
The control module detects a system voltage less than 9 V for 5 seconds.
B1325 07
The control module detects a system voltage greater than 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, which is disabled after a 3 minute delay. |
| • | The setting of other DTCs is inhibited. |
Conditions for Clearing the DTC
| • | The DTC will pass when the condition for setting the DTC is no longer present. |
| • | A history DTC will clear when the DTC does not fail in 100 consecutive ignition cycles. |
Diagnostic Aids
| • | A high or low voltage value in multiple modules indicates a concern in the charging system. |
| • | Possible causes of this DTC are overcharging with a battery charger or jump starting. |
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 Testing
- Engine running, accessories OFF, measure and record the battery voltage at the 12 V battery terminals. The voltage should be between 12.6 and 15.0 V.
- Ignition OFF, disconnect the harness connectors at the appropriate module.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 30 seconds. Test for less than 5 Ω between the appropriate ground circuits listed below and ground.
- Verify that a test lamp illuminates between the appropriate B+ circuit terminals listed below and ground.
- If all circuits test normal, replace the appropriate module.
| ⇒ | If not within the specified range, refer to Charging System Test. |
| • | Terminal 13 (IPC) |
| • | Terminal D (PPS) |
| • | Terminal 8 X1 (Radio) |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal 2 (IPC) |
| • | Terminal A (PPS) |
| • | Terminal 1 X1 (Radio) |
| ⇒ | If the test lamp does not illuminate, test the 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 module replacement, setup, and programming.
