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| • | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Battery Positive Voltage Circuit | B1517 03 | B1517 03 | - | B1517 5A B1517 07 |
Ground Circuit | B1517 03 | B1517 03 | - | B1517 5A B1517 07 |
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.
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.
The battery voltage falls below 11 volts, engine speed less than 1,100 RPM for 15 seconds.
The battery voltage rises above 16 volts, engine speed less than 1,100 RPM for 15 seconds.
The battery voltage differs by 2 volts on the BCM battery sense circuits for 10 seconds.
The charge indicator on the instrument panel cluster (IPC) illuminates.
| • | 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. |
With any module voltage performance DTC, always perform the Charging System Test to ensure the charging system is functioning properly.
Starting and Charging Schematics
| ⇒ | If the voltage is not within 10.5-15 volts. Test the battery positive and ground circuits of the BCM for high resistance or an open, and repair as necessary. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming
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