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P0BA1




DTC P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0BA1, or P0BA6

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 P0B3D
- Hybrid Battery 1 Circuit Low Voltage

DTC P0B42
- Hybrid Battery 2 Circuit Low Voltage

DTC P0B47
- Hybrid Battery 3 Circuit Low Voltage

DTC P0B4C
- Hybrid Battery 4 Circuit Low Voltage

DTC P0B51
- Hybrid Battery 5 Circuit Low Voltage

DTC P0B56
- Hybrid Battery 6 Circuit Low Voltage

DTC P0B5B
- Hybrid Battery 7 Circuit Low Voltage

DTC P0B60
- Hybrid Battery 8 Circuit Low Voltage

DTC P0B65
- Hybrid Battery 9 Circuit Low Voltage

DTC P0B6A
- Hybrid Battery 10 Circuit Low Voltage

DTC P0B6F
- Hybrid Battery 11 Circuit Low Voltage

DTC P0B74
- Hybrid Battery 12 Circuit Low Voltage

DTC P0B79
- Hybrid Battery 13 Circuit Low Voltage

DTC P0B7E
- Hybrid Battery 14 Circuit Low Voltage

DTC P0B83
- Hybrid Battery 15 Circuit Low Voltage

DTC P0B88
- Hybrid Battery 16 Circuit Low Voltage

DTC P0B8D
- Hybrid Battery 17 Circuit Low Voltage

DTC P0B92
- Hybrid Battery 18 Circuit Low Voltage

DTC P0B97
- Hybrid Battery 19 Circuit Low Voltage

DTC P0B9C
- Hybrid Battery 20 Circuit Low Voltage

DTC P0BA1
- Hybrid Battery 21 Circuit Low Voltage

DTC P0BA6
- Hybrid Battery 22 Circuit Low Voltage

Diagnostic Fault Information





Circuit/System Description

The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the drive motor generator control module through serial data. The drive motor generator control module is the host controller for diagnostic trouble code (DTC) information.

The hybrid battery assembly consists of 22 individual battery modules. Each battery module is rated at 12.0 V. The batteries are connected together in a series circuit. The drive motor generator battery control module monitors the hybrid battery voltage on every two batteries for a total of 22 locations, across the battery assembly. The drive motor generator battery control module determines the actual terminal voltage by monitoring the output voltage from the high voltage contactors. The drive motor generator battery control module also multiplies each individual battery voltage measurement by 22, and compares this calculation to the terminal voltage measurement.

The drive motor generator battery control module monitors and compares these voltages using several different methods. The drive motor generator battery control module determines the calculated battery voltage by adding the voltage at the 22 locations together. The normal operating range for each battery module is 10-15 V. The normal operating range for the battery is 198-320 V.

Conditions for Running the DTC

* The ignition is ON.
* The 12 V battery voltage is 9-18 V.

Conditions for Setting the DTC

Any hybrid battery voltage value is less than 6.0 V for 1 second.

Action Taken When the DTC Sets

* DTCs P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0BA1 and P0BA6 are type B DTCs.
* The drive motor generator battery control module commands the drive motor battery coolant fan to high speed.
* If more than 4 of these DTCs are set, the drive motor generator battery control module sends a serial data message to the drive motor generator control module to reduce the power use limit to 50 percent.

Conditions for Clearing the DTC

DTCs P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0BA1 and P0BA6 are type B DTCs.

Reference Information
Schematic Reference

Hybrid Energy Storage Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Drive Motor Generator Battery Description (Drive Motor Generator Battery Identification Information)
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)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

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

* EL-48571 High Voltage Battery Pin Out Box
* EL-48900 HEV Safety Kit

Circuit/System Verification

Ignition ON, observe the scan tool Hybrid Battery 1-22 parameters. Each reading should be between 10-15 V. All reading should be within 1.5 V of each other.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

* Identify how to disable high voltage.
* Identify how to test for the presence of high voltage.
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Failure to follow the procedures exactly as written may result in serious injury or death.

1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling (High Voltage Disabling).
2. Disconnect the X2 harness connector at the drive motor generator battery control module.
3. Connect the EL-48571 to the X2 harness connector.
4. Install the high voltage manual disconnect lever.
5. Insert the DMM probes into the EL-48571 test cavities. Measure and record the voltage of each battery by cycling the EL-48571 through each of the 22 switch positions. All voltages should be between 10-15 V and within 1.5 V of each other.

• If any of the voltage values are not within the specified range, replace the drive motor generator battery assembly.

6. If all circuits test normal, replace the drive motor generator battery control module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.

* Drive Motor Generator Battery Replacement (Drive Motor Generator Battery Control Module and Bracket Replacement)
* Control Module References (Programming and Relearning) for drive motor generator battery control module replacement, setup and programming

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