P0BA5

DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0, or P0BA5

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 P0B3C
- Hybrid Battery 1 Circuit Performance

DTC P0B41
- Hybrid Battery 2 Circuit Performance

DTC P0B46
- Hybrid Battery 3 Circuit Performance

DTC P0B4B
- Hybrid Battery 4 Circuit Performance

DTC P0B50
- Hybrid Battery 5 Circuit Performance

DTC P0B55
- Hybrid Battery 6 Circuit Performance

DTC P0B5A
- Hybrid Battery 7 Circuit Performance

DTC P0B5F
- Hybrid Battery 8 Circuit Performance

DTC P0B64
- Hybrid Battery 9 Circuit Performance

DTC P0B69
- Hybrid Battery 10 Circuit Performance

DTC P0B6E
- Hybrid Battery 11 Circuit Performance

DTC P0B73
- Hybrid Battery 12 Circuit Performance

DTC P0B78
- Hybrid Battery 13 Circuit Performance

DTC P0B7D
- Hybrid Battery 14 Circuit Performance

DTC P0B82
- Hybrid Battery 15 Circuit Performance

DTC P0B87
- Hybrid Battery 16 Circuit Performance

DTC P0B8C
- Hybrid Battery 17 Circuit Performance

DTC P0B91
- Hybrid Battery 18 Circuit Performance

DTC P0B96
- Hybrid Battery 19 Circuit Performance

DTC P0B9B
- Hybrid Battery 20 Circuit Performance

DTC P0BA0
- Hybrid Battery 21 Circuit Performance

DTC P0BA5
- Hybrid Battery 22 Circuit Performance

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.
* No high or low voltage sensor DTCs are set.

Conditions for Setting the DTC

The drive motor generator battery control module measures the terminal voltage in order to determine the total voltage level of the hybrid battery. The drive motor generator battery control module multiplies each individual battery voltage measurements by 22 and compares this calculation to the terminal voltage measurement. When these two voltage readings have a voltage difference greater than or less than 70 V for 6 seconds.

Action Taken When the DTC Sets

* DTCs P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0 and P0BA5 are type B DTCs.
* 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 P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0 and P0BA5 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, and all readings 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. Remove the drive motor generator battery cover. Refer to Drive Motor Battery Cable Terminal Extension Cover Replacement (Drive Motor Battery Cable Terminal Extension Cover Replacement) and Battery Terminal Cover Replacement (Battery Terminal Cover Replacement)
3. Disconnect the X2 harness connector at the drive motor generator battery control module.
4. Connect the EL-48571 to the X2 harness connector.
5. Install the high voltage manual disconnect lever.
6. 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.

7. 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