Circuit Description
The body control module (BCM) monitors the battery voltage through the battery positive voltage circuit.
A type information accompanies the DTC. Refer to DTC Symptom Description in Vehicle DTC Information.
Conditions for Running the DTC
The voltage supplied to the BCM is in the range of 7-26 volts.
Conditions for Setting the DTC
| • | DTC B1325 Type 03: |
| - | The BCM detects a system voltage below 9.0 volts. |
| - | The above condition is present at least 5 seconds. |
| • | DTC B1325 Type 07: |
| - | The BCM detects a system voltage above 18.0 volts. |
| - | The above condition is present at least 5 seconds. |
Action Taken When the DTC Sets
| • | The BCM immediately disables all outputs when a high voltage condition was detected, with the exception of GMLAN and Run/Crank relay that are disabled after a 3 minutes delay. |
| • | The setting of other DTCs is inhibited. |
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Body Control System Schematics in Computer/Integrating Systems Connector End View Reference: Computer/Integrating Systems Connector End Views in Computer/Integrating Systems | ||||
1 | Did you perform the Vehicle Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Is the Battery Voltage Signal parameter displayed in the specified range? | 9-18 V | Go to Step 3 | Go to Step 4 |
3 | Is the DTC set as a current DTC? | -- | Go to Step 7 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
4 |
Is the measured value in the specified range? | 9-18 V | Go to Step 6 | Go to Step 5 |
5 | Test the battery positive voltage circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Battery Inspection/Test in Engine Electrical |
6 | Test the all of ground circuits of the BCM for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 7 |
7 | Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 8 |
8 |
Important: Perform the module setup procedure. Replace the BCM. Refer to Body Control Module Replacement in Computer/Integrating Systems. Did you complete the replacement? | -- | Go to Step 9 | -- |
9 | Operate the system in order to verify the repair. Did you find and correct the condition? | -- | System OK | Go to Step 2 |
