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 03 : Battery Voltage Below ThresholdDTC B1517 07 : Battery Voltage Above Threshold
DTC B1517 5A : Battery Voltage Plausibility Failure
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | B1517 | B1517 | -- | -- |
B+ high resolution | B1517 | B1517 | -- | -- |
Ground | -- | B1517 | -- | -- |
Circuit/System Description
The body control module (BCM) has designated circuits for monitoring vehicle system voltage. The BCM monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. The BCM monitors the system voltage over an extended length of time. If the BCM detects the system voltage is outside an expected range for the calibrated length of time, or the BCM battery sense circuits differ by 2 volts, DTC B1517 will set. Other modules also monitor system voltage the system voltage message is sent to the other modules and will default to 12.9 volts.
Conditions for Running the DTC
The DTC shall run only if the BCM has power, ground, and the ignition is not in the START mode. This DTC shall execute regardless of battery voltage.
Conditions for Setting the DTC
B1517 03
The battery voltage falls below 11 volts, engine speed greater than 1,100 RPM for 15 seconds.
B1517 07
The battery voltage is greater than 16 volts, engine speed greater than 1,00 RPM for 15 seconds.
B1517 5A
The battery voltage differs by 2 volts on the BCM battery sense circuits for 10 seconds.
Action Taken When the DTC Sets
The driver information center (DIC) displays the SERVICE BATTERY CHARGING SYSTEM warning message and the Charge Indicator on the instrument panel cluster (IPC) illuminates.
Conditions for Clearing the DTC
| • | The DTC will clear current status when fault is no longer present. |
| • | The history DTC will clear after 50 consecutive ignition cycles have occurred without a malfunction. |
Diagnostic Aids
| • | A high or low voltage DTC set 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. |
| • | Inspect the ground connection G303, and ensure that it is clean and tight. |
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, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.
- Observe the scan tool BCM Battery Voltage parameter. The reading should be between 12.6 and 15.0 volts.
| ⇒ | If not within the specified range, refer to Charging System Test |
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the BCM.
- Ignition OFF, test for less than 3.0 ohms between the ground circuit terminal 9 X4 and ground.
- Ignition On, verify a test lamp illuminates between the B+ circuits terminals listed below and ground.
- If all circuits test normal, replace the BCM.
| ⇒ | If not within the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal 3 X3 |
| • | Terminal 10 X4 |
| ⇒ | If the test lamp did not illuminate, test the appropriate 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.
