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 03
- Battery Voltage Below Threshold

DTC B1517 07
- Battery Voltage Above Threshold

DTC B1517 52
- Battery Voltage Compare Failure

Diagnostic Fault Information





Circuit/System Description

The instrument panel module (IPM) has designated circuits for monitoring vehicle system voltage. The IPM 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 IPM monitors the system voltage over an extended length of time. If the IPM detects the system voltage is outside an expected range for the calibrated length of time, or the IPM battery sense circuits differ by 3 V 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 V.

Conditions for Running the DTC

This DTC shall run only if the IPM has power, ground, and the ignition is not in START mode. This DTC shall execute regardless of the battery voltage, except when the DTC B1440 is set current.

Conditions for Setting the DTC

B1517 03

The battery voltage falls below 11 V, engine speed greater than 1,100 RPM for 15 seconds.

B1517 07

The battery voltage is greater than 16 V, engine speed greater than 1,100 RPM for 15 seconds.

B1517 52

The battery voltage differs by 3 V on the IPM battery sense circuits for 15 seconds.

Action Taken When the DTC Sets

* The driver information center (DIC) displays the Battery Voltage Low Message.
* The DIC displays the Battery Voltage High Message.
* The DIC displays the SERVICE VEHICLE SOON 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

Important: With any module voltage performance DTC, always perform the Charging System Test (Charging System Test) to ensure the charging system is functioning properly.


Reference Information
Schematic Reference

Body Control System Schematics (Electrical 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

Circuit/System Verification

1. 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 V.
2. If not within the specified range, refer to Charging System Test (Charging System Test)
3. Observe the scan tool IPM Battery Voltage parameter. The reading should be between 12.6 and 15.0 V.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the IPM.
2. Ignition OFF, test for less than 3.0 Ohms between the ground circuits listed below and ground.

* Terminal 10 X3
* Terminal 3 X3

• If not within the specified range, test the ground circuits for an open/high resistance.

3. Ignition ON, verify a test lamp illuminates between the B+ circuits listed below and ground.

* Terminal 1 X3
* Terminal 2 X3

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

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

Repair Instructions

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

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