Circuit Description
The body control module (BCM) monitors the battery voltage through the VBATT1 circuit. Refer to Body Control System Schematics
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. |
Diagnostic Aids
| • | The following may cause an intermittent: |
| - | A damaged terminal |
| - | A backed out terminal |
| - | A poor terminal tension |
| - | A chafed wire |
| - | A broken wire inside the insulation |
| • | When diagnosing an intermittent short or an open, manipulate the wire harness while watching the test equipment for changes. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Body Control System Schematics Connector End View Reference: Computer/Integrating Systems Connector End Views | ||||
1 | Did you perform the diagnostic system check - vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Is the battery voltage input parameter displayed in the specified range? | 9.0-18.0 volts | Go to Step 3 | Go to Step 4 |
3 | Is the DTC set as a current DTC? | -- | Go to Step 7 | Go to Diagnostic Aids |
4 |
Is the measured value in the specified range? | 9.0-18.0 volts | Go to Step 6 | Go to Step 5 |
5 | Test the VBATT1 circuit for a short to ground or an open. Refer to Circuit Description. 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. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 7 |
7 | Inspect for poor connections at the module harness connectors. 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 if required. Replace the BCM. Refer to Body Control Module Replacement . 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 |
