B1517

DTC B1517

Diagnostic Instructions

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



DTC Descriptors
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.



Reference Information


Schematic Reference
* Body Control System Schematics (Electrical Diagrams)
* Starting and Charging Schematics ([1][2]Electrical Diagrams)
* Ground Distribution Schematics (Ground Distribution Diagrams)


Connector End View Reference

Component Connector End Views (Connector Views)

Description and Operation

Charging System Description and Operation (Description and Operation)


Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)


Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


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. Ignition ON. Measure and record the voltage at the battery terminals. Verify that the battery voltage is 11-16 volts. Repeat with the engine running.

• If not within the specified range, go to Charging System Test (Charging System Test).

2. Observe the scan tool BCM Battery Voltage parameter. The scan tool data should not differ from the recorded battery voltage by more than 2 volts.

• If not within the specified range, go to Circuit/System Testing.

3. Go to Diagnostic Aids.



Circuit/System Testing

1. Ignition OFF. Disconnect the harness connectors X1, X2, X3, and X4 from the BCM.
2. Ignition OFF. Test for less than 1.0 ohm between the ground circuits X1 terminal 12, X2 terminal 13, and X4 terminal E12 and ground.

• If greater than the specified value, repair the ground circuit.

3. Ignition ON. Measure voltage on the B+ circuit X3 terminal D12. The voltage on the B+ circuit should be equal to battery voltage.

• If not the specified value, test the circuit for a short to ground or an open/high resistance.

4. If all circuits test normal, replace the BCM.



Repair Instructions

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


Control Module References (Programming and Relearning)for BCM replacement, setup, and programming.