P1B05
DTC P1AE2-P1AE4, P1B05, or P1B06
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 Instructionsprovides an overview of each diagnostic category.
DTC Descriptors
DTC P1AE2
- Battery Energy Control Module High Voltage System Interlock Circuit
DTC P1AE3
- Battery Energy Control Module High Voltage System Interlock Circuit Low Voltage
DTC P1AE4
- Battery Energy Control Module High Voltage System Interlock Circuit High Voltage
DTC P1B05
- Drive Motor 1 Control Module High Voltage System Interlock Circuit
DTC P1B06
- Drive Motor 2 Control Module High Voltage System Interlock Circuit
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The high voltage interlock circuit is utilized to verify high voltage component integrity. High voltage interlock circuit is a circuit loop that passes through certain high voltage components. High voltage interlock circuit is used to determine if access to high voltage components is being attempted. The opening of these high voltage components causes the high voltage interlock circuit to open. The battery energy control module sources about 12 mA of current on the 5V high voltage interlock circuit loop. The battery energy control module monitors both the high voltage interlock source current circuit and the high voltage interlock return current circuit in order to detect circuit faults. Both motor control modules monitor the circuit for current in order to detect an open condition. When the battery energy control module and/or the motor control modules sense conditions such as a loss of high voltage interlock circuit current, the high voltage contactor relays are commanded open by the hybrid powertrain control module.
Conditions for Running the DTC
P1B05 and P1B06
* The ignition voltage is 8-18 V.
* Wake up signal is active.
* Battery energy control module is supplying current on the high voltage interlock circuit. This normally occurs when high voltage contactor relays are closed.
P1AE2, P1AE3 and P1AE4
* The ignition voltage is 9-18 V.
* Wake up signal is active.
* Battery energy control module is supplying current on the high voltage interlock circuit. This normally occurs when high voltage contactor relays are closed.
Conditions for Setting the DTC
P1B05 and P1B06
* The motor control module does not detect high voltage interlock circuit current flow.
* DTC P1B05 and P1B06 set within 1 second when the above condition is met.
P1AE2
* The battery energy control module detects high voltage interlock circuit source current is less than 5 mA and high voltage interlock return current is less than 5 mA.
* DTC P1AE2 sets within 1 second when the above condition is met.
P1AE3
* The battery energy control module detects high voltage interlock source current is between 5-18 mA and high voltage interlock return current is less than 5 mA.
* DTC P1AE3 sets within 1 second when the above condition is met.
P1AE4
* The battery energy control module detects high voltage interlock source current is less than 5 mA and high voltage interlock return current is greater than 35 mA.
* DTC P1AE4 sets within 1 second when the above condition is met.
Action Taken When the DTC Sets
* DTCs P1B05, P1B06, P1AE2, P1AE3, P1AE4 are Type C DTCs.
* The hybrid powertrain control module commands the battery energy control module to open the high voltage contactor relays when vehicle speed is less than 5 km/h (3 mph) for 6 seconds.
Conditions for Clearing the DTC
DTCs P1B05, P1B06, P1AE2, P1AE3, P1AE4 are Type C DTCs.
Diagnostic Aids
* Test for a fully engaged high voltage manual disconnect lever whenever an open high voltage interlock circuit condition is observed. The manual disconnect lever must be pressed down fully in order to engage the high voltage interlock circuit terminals.
* The battery energy control module high voltage interlock source circuit and high voltage interlock return circuit current sensors may not measure actual circuit current with the same accuracy. The battery energy control module high voltage interlock source circuit parameter may indicate less current than the battery energy control module high voltage interlock return circuit parameter for this reason. Measuring actual HVIC current with a DMM may also not compare directly to the parameter display.
* The high voltage interlock circuit detects removal of the following components:
- The drive motor generator control module sight shield
- The transmission 3 phase cable cover
- The high voltage manual disconnect lever
- The hybrid battery terminal extension cover assembly
* The high voltage interlock circuit is also routed through several inline connectors.
* With the ignition in the OFF position, the battery energy control module will source the high voltage interlock circuit current for 5 minutes every time a vehicle door is opened.
Reference Information
Schematic Reference
Hybrid Controls Schematics Hybrid Controls Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
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
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearningfor scan tool information
Circuit/System Verification
Note: The hybrid powertrain control module must command the high voltage contactor relays closed in order for high voltage interlock circuit to be enabled. Fail will be displayed if any DTCs present at ignition ON prevent the hybrid powertrain control module from closing the high voltage contactor relays.
If the DTC set, Record and then clear the DTC information. Ignition OFF, wait 2 minutes. Ignition ON, observe the scan tool HPCMs battery energy control module HVIC Status and hybrid powertrain control module HVIC Status parameters. The parameters should both indicate a PASS condition.
Circuit/System Testing
P1B05 and P1B06 without P1AE2, P1AE3 or P1AE4
Note: DTCs P1B05 and P1B06 should always pass and fail together. If one DTC has passed while one has failed, replace the drive motor generator power inverter control module.
Note: The drive motor generator power inverter module sight shield must be installed during all testing in order to complete the high voltage interlock circuit current loop.
1. Ignition OFF, remove the F103 drive motor generator power inverter module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement Drive Motor Generator Control Module Sight Shield Replacement , and disconnect the X1 harness connector at the T6 drive motor generator power inverter module.
2. Ignition OFF, wait 2 minutes. Install the F103 drive motor generator control module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement Drive Motor Generator Control Module Sight Shield Replacement. Ignition ON, observe the scan tool battery energy control module HVIC Source Current parameter should read less than 5 mA.
• If greater than specified value, test for the HVIC Source and HVIC Return circuits shorted together between X1 harness connector at the T6 drive motor generator power inverter module and X350 harness connector of A4 hybrid battery pack assembly.
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.
3. Perform the High Voltage Disabling High Voltage Disabling procedure and test for the HVIC Source and HVIC Return circuits shorted together between X350 harness connector at the A4 hybrid battery pack assembly and X1 harness connector at the K16 battery energy control module. If the circuit tests normal, replace the K16 battery energy control module.
4. If the circuit tests normal, test for open circuit between the hybrid voltage interlock circuit return circuit terminal 1 and the hybrid voltage interlock circuit source circuit terminal 23. If the circuit tests normal, replace the T6 drive motor generator power inverter module.
P1B05 and P1B06 with P1AE2
Note: DTCs P1B05 and P1B06 should always pass and fail together. If one DTC has passed while one has failed, replace the drive motor generator power inverter control module.
Note: The drive motor generator power inverter module sight shield must be installed during all testing in order to complete the high voltage interlock circuit current loop.
1. Ignition OFF, remove the F103 drive motor generator power inverter module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement Drive Motor Generator Control Module Sight Shield Replacement , and disconnect the X1 harness connector at the T6 drive motor generator power inverter module.
2. Install a 3 A fused jumper wire between the hybrid voltage interlock circuit return circuit terminal 1 and the hybrid voltage interlock circuit source circuit terminal 23.
3. Ignition OFF, wait 2 minutes. Install the F103 drive motor generator control module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement Drive Motor Generator Control Module Sight Shield Replacement. Ignition ON, observe the scan tool HVIC Source Current parameter, the reading should be between 5-18 mA.
• If less than the specified range, Remove the 3 A fused jumper wire.
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.
4. Perform the High Voltage Disabling High Voltage Disabling procedure and test hybrid voltage interlock source circuit and hybrid voltage interlock return circuit for an open/high resistance. If circuits test normal, replace the K16 battery energy control module.
5. If the circuit tests normal, Test for open circuit between the hybrid voltage interlock circuit return circuit terminal 1 and the hybrid voltage interlock circuit source circuit terminal 23. If the circuit tests normal, replace the T6 drive motor generator power inverter module.
P1AE3 with or without P1B05 and P1B06
Note: DTCs P1B05 and P1B06 should always pass and fail together. If one DTC has passed while one has failed, replace the drive motor generator power inverter control module.
Note: The drive motor generator power inverter module sight shield must be installed during all testing in order to complete the high voltage interlock circuit current loop.
1. Ignition OFF, remove the F103 drive motor generator power inverter module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement Drive Motor Generator Control Module Sight Shield Replacement , and disconnect the X1 harness connector at the T6 drive motor generator power inverter module.
2. Ignition OFF, wait 2 minutes. Install the F103 drive motor generator control module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement Drive Motor Generator Control Module Sight Shield Replacement. Ignition ON, observe the scan tool battery energy control module HVIC Source Current parameter should read less than 5 mA.
• If the HVIC Source Current parameter indicates current between 5-18 mA test the HVIC Source circuit for a short to ground between X1 harness connector at the T6 drive motor generator power inverter module and X350 harness connector at the A4 hybrid battery pack assembly.
3. Install a 3A fused jumper wire between the HVIC return circuit terminal 1 and the HVIC Source circuit terminal 23.
4. Ignition ON, observe the scan tool battery energy control module HVIC Source Current and HVIC Return Current parameters should be between 5-18 mA.
• If both circuits test normal, replace the T6 drive motor generator power inverter module.
• If only the HVIC Source Current parameter indicates current between 5-18 mA test the hybrid voltage interlock return circuit for a short to ground between X1 harness connector at the T6 drive motor generator power inverter module and X350 harness connector at the A4 hybrid battery pack assembly.
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.
5. Remove 3A jumper fuse and test the high voltage interlock return circuit for a short to ground between X350 harness connector at the A4 hybrid battery pack assembly, and X1 harness connector at the K16 battery energy control module. If the circuit tests normal, replace the K16 battery energy control module.
P1AE4 with or without P1B05 and P1B06
Note: DTCs P1B05 and P1B06 should always pass and fail together. If one DTC has passed while one has failed, replace the drive motor generator power inverter control module.
Note: The drive motor generator power inverter module sight shield must be installed during all testing in order to complete the high voltage interlock circuit current loop.
1. Ignition OFF, remove the F103 drive motor generator power inverter module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement Drive Motor Generator Control Module Sight Shield Replacement , and disconnect the X1 harness connector at the T6 drive motor generator power inverter module.
2. Ignition OFF, wait 2 minutes. Install the F103 drive motor generator control module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement Drive Motor Generator Control Module Sight Shield Replacement. Ignition ON, test for less than 35 mA between the hybrid voltage interlock source circuit terminal 23 and ground.
• If more than the specified range, test the hybrid voltage interlock source circuit for a short to voltage between X1 harness connector at the T6 drive motor generator power inverter module and X350 harness connector at the A4 hybrid battery pack assembly.
3. Ignition ON, test for less than 35 mA with a DMM between the hybrid voltage interlock return circuit terminal 1 and ground.
Note: Removal of the high voltage manual disconnect lever also opens the HVIC source circuit between X350 and battery energy control module connector X1.
• If more than the specified range, test the hybrid voltage interlock return circuit for a short to voltage between X1 harness connector at the T6 drive motor generator power inverter module and X350 harness connector at the A4 hybrid battery pack assembly.
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.
4. Perform the High Voltage Disabling High Voltage Disabling procedure and test the HVIC Return circuit for a short to voltage between X350 harness connector at the A4 hybrid battery pack assembly and X1 harness connector at the K16 battery energy control module. If the circuit tests normal, replace the K16 battery energy control module.
5. Replace the T6 drive motor generator power inverter module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Programming and Relearningfor Drive Motor Generator Power Inverter Module or Battery Energy Control Module replacement, setup, and programming