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 B1517 5A: Battery Voltage Plausibility FailureDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ Terminal D12 X3 | B1325 03, B1517 5A* | B1325 03, B1517 5A* | -- | -- |
B+ Terminal 11 X1 | B1517 5A | B1517 5A | -- | -- |
Ground | -- | B1517 5A | -- | -- |
*The scan tool will not power up from the DLC if the B+ circuit terminal D12 X3 is open or shorted to ground. | ||||
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, Engine OFF. Parameter Normal Value: 12.60 Volts | |||
B+ Terminal D12 X3 | 0.00 Volts* | 0.00 Volts* | -- |
*The scan tool will not power up from the DLC if the B+ circuit terminal D12 X3 is open or shorted to ground. | |||
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, Engine OFF. Parameter Normal Value: 12.600 Volts | |||
B+ Terminal 11 X1 | 0.000 Volts | 0.000 Volts | -- |
Ground Terminal 9 X1 | -- | 0.000 Volts | -- |
Circuit/System Description
The body control module (BCM) has two circuits for monitoring vehicle system voltage. The circuits are supplied by the IBCM 1 fuse and the BATT SENSE fuse. The BCM monitors the system voltage on the two B+ circuits to ensure that the voltage stays within the normal range. Damage to components, and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
| • | The BCM has power and ground. |
| • | The ignition is not in the START position. |
Conditions for Setting the DTC
The voltage of the two BCM battery sense circuits differs by 2 V for 10 seconds.
Action Taken When the DTC Sets
The instrument panel cluster (IPC) illuminates the charge indicator.
Conditions for Clearing the DTC
| • | The DTC will pass when the condition is no longer present. |
| • | A history DTC will clear after 50 consecutive ignition cycles have occurred without a malfunction. |
Diagnostic Aids
| • | A high or low voltage DTC in multiple modules indicates a concern in the charging system. |
| • | This DTC may be set by overcharging with a battery charger, or jump by starting. |
Reference Information
Schematic Reference
Starting and Charging Schematics
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, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V.
- Observe the scan tool BCM Battery Voltage Signal parameter and the Batt. Voltage High Res. parameter. The reading for both parameters should be between 12.6 and 15.0 Volts, and should be within 2 Volts of each other.
| ⇒ | If not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Verify that a test lamp illuminates between the ONSTAR fuse in the BCM and ground.
- Ignition OFF, disconnect the harness connectors at the BCM.
- Ignition OFF, test for less than 5 Ω of resistance between the ground circuit terminals listed below and ground.
- Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.
- If all circuits tests normal, replace the BCM.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| • | Terminal 9 X1 |
| • | Terminal E12 X4 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal 11 X1 |
| • | Terminal D12 X3 |
| ⇒ | 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 BCM replacement, setup, and programming.
