B151C

DTC B151C

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC B151C 39

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Battery Sensor Module Internal Malfunction

DTC B151C 42

-
Battery Sensor Module Calibration Not Programmed

Circuit/System Description

The generator battery control module monitors its internal battery current sensor for many charging system operations, and also for diagnostic purposes. If there is an internal malfunction of the generator battery control module, or if the body control module (BCM) determines the generator battery control module is not programmed, this DTC will set.

Conditions for Running the DTC

* The engine is not running.

* This diagnostic runs every 50 ms.

Conditions for Setting the DTC

* The intelligent battery control module has an internal malfunction.

* The BCM detects the intelligent battery control module is not programmed.

Action Taken When the DTC Sets

The regulated voltage control is disabled.

Conditions for Clearing the DTC

The duty cycle of the internal battery current sensor is 3-97% duty cycle.

Diagnostic Aids

DTC B151C may set if a battery charger is used.

Reference Information

Schematic Reference

Starting and Charging Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left (DH6)

Description and Operation

Charging System Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Verify that the B18 Battery Current Sensor is installed correctly. The B18 Battery Current Sensor should be installed on the negative battery cables, with the sensor coil around the negative cables and facing away from the battery, and with the harness connector facing toward the battery.

• If the B18 Battery Current Sensor is installed backwards or incorrectly, remove and reinstall the B18 Battery Current Sensor.

2. Ignition ON, clear the DTC with the scan tool. Verify that DTC B151C does not set.

3. If the DTC resets, Program the B18 Battery Current Sensor with the scan tool.

4. Ignition on, clear the DTC with the scan tool. Verify that DTC B151C does not set.

• If the DTC sets, replace the B18 Battery Current Sensor.

5. Ignition on, verify that DTC B151C does not set.

• If the DTC sets, replace the K9 Body Control Module.

Repair Instructions

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

* Battery Current Sensor Replacement Service and Repair

* Control Module References Control Module References for module replacement, programming and setup