P1A60
DTC P1A60
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 provides an overview of each diagnostic category.
DTC Descriptor
DTC P1A60
- Battery Energy Control Module Ignition Accessory Switch Circuit Low Voltage
Diagnostic Fault Information
Circuit/System Description
The RUN/CRANK relay applies ignition voltage to the ignition 1 circuit when the ignition is in the RUN or CRANK position. The ignition 1 circuit supplies ignition voltage to the Starter/Generator Control Module. The ignition 1 circuit also continues through the Starter/Generator Control Module in a pass-thru manner and continues to the Battery Energy Control Module. The Battery Energy Control Module also monitors the power mode message which is broadcast via serial data and compares the power mode message to the actual power mode as indicated by voltage on the ignition 1 circuit.
Controlled by the Body Control Module (BCM), the accessory wakeup circuit supplies voltage to the Starter/Generator Control Module as a means to wake the control module and initiate serial data communications. Like the ignition 1 circuit, the accessory wakeup circuit continues through the Starter/Generator Control Module in a pass-thru manner and continues to the Battery Energy Control Module.
Conditions for Running the DTC
* Battery voltage is greater tan 9.6 V
* Battery energy control module is awake and communicating
* Serial data indicates the power mode is RUN/CRANK
* Propulsion system is active
Conditions for Setting the DTC
The accessory wakeup serial data circuit is not active
Action Taken When the DTC Sets
DTC P1A60 is a type B DTC
Conditions for Clearing the DTC
DTC P1A60 is a type B DTC
Reference Information
Schematic Reference
Hybrid/EV Energy Storage Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left
Description and Operation
Drive Motor Battery System Description
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 Control Module References for scan tool information
Special Tools
EL-48900 - HEV Safety Kit
For equivalent regional tools, refer to Special Tools .
Circuit/System Verification
1. Ignition ON.
2. Verify DTC U2099 is not set.
• If the DTC is set
Refer to DTC U2099 U2099.
• If the DTC is not set
3. Refer to Circuit/System Testing
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 includes the following steps:
* 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.
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
* Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
- Visually and functionally inspect the gloves before use.
- Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.
Failure to follow the procedures may result in serious injury or death.
Danger: The eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
Note: In High Voltage Disabling , perform the disabling procedure for servicing components within the A4 Hybrid/EV Battery Pack. The C4A Hybrid/EV Battery Section 1 and C4B Hybrid/EV Battery Section 2 will be disconnected as part of the disabling procedure.
1. Ignition OFF, disable high voltage at the A4 Hybrid/EV Battery Pack. Refer to High Voltage Disabling .
2. Disconnect the X1 harness connector at the K16 Battery Energy Control Module.
3. Connect the 12 V battery, ignition ON.
4. Verify a test lamp illuminates between the ignition circuit terminal 20 and ground.
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the X4 harness connector at the K59 Starter/Generator Control Module.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K59 Starter/Generator Control Module.
• If the test lamp illuminates
5. Replace the K16 Battery Energy Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Control Module References Control Module References for Battery Energy Control Module or Starter/Generator Control Module replacement, programming, and setup