B1517

DTC B1517

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B1517 5A
- Battery Voltage Plausibility Failure

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) has 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. The system voltage message is sent to the other modules. The message will default to 12.9 volts if there is a plausibility failure.

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 volts for 10 seconds.

Action Taken When the DTC Sets

* The instrument panel cluster (IPC) illuminates the charge indicator.
* The driver information center (DIC) displays the CHECK CHARGE SYSTEM warning message.

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 in multiple modules indicates a concern in the charging system. Refer to Charging System Test. Charging System Test
* Inspect the ground connections G109 (LAT), G201, 203, and 305, and insure that they are clean and tight.
* This DTC may be set by overcharging with a battery charger, or jump by starting.

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.

• If not within the specified range, refer to Charging System Test. Charging System Test

2. 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.

Circuit/System Testing

1. Verify that a test lamp illuminates between the B+ circuit fuses in the BCM listed below and ground:

* The Ign Sensor fuse
* The Interior Lights fuse
* The Door Lock fuse

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

2. Ignition OFF, disconnect the harness connectors at the BCM.
3. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminals listed below and ground:

* Terminal 12 X1
* Terminal 13 X2
* Terminal E12 X4

• If greater than the specified range, test the ground circuit for an open/high resistance.

4. Verify that a test lamp illuminates between the B+ circuit terminal D12 X3 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

5. If all circuits tests normal, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests