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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P1A5E or P1A5F: Battery Energy Control Module Ignition On/Start Switch Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING:

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.

  1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to High Voltage Disabling
  2. Connect the 12 V battery, disconnect the X358 harness connector at the A4 Hybrid/EV Battery Pack.
  3. Verify that a test lamp does not illuminate between the ignition circuit terminal 4 and ground.
    • If the test lamp illuminates 

      Repair the short to voltage on the ignition circuit.

    • If the test lamp does not illuminate 
  4. Vehicle in Service Mode
  5. Verify a test lamp illuminates between the ignition circuit terminal 4 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Vehicle OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Vehicle OFF, disconnect the harness connector at all devices that share the same ignition circuit.
    2. Test for infinite resistance between the ignition circuit terminal 4 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    3. Vehicle OFF, remove the A4 Hybrid/EV Battery Pack cover. Refer to High Voltage Battery Cover Replacement (Top Cover) , High Voltage Battery Cover Replacement (Front Cover) , High Voltage Battery Cover Replacement (Left Side) and/or High Voltage Battery Cover Replacement (Right Side)
    4. Connect the EL-50211  low voltage jumper harness extension.
    5. Disconnect the X8 harness connector at the K16 Battery Energy Control Module.
    6. Test for infinite resistance between the ignition circuit terminal 9 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    7. Connect each of the devices that share the same ignition circuit one at a time and test for greater than 100 Ω between the ignition circuit terminal 9 and ground.
      • If 100 Ω or less, disconnect the appropriate device and retest to verify if the short is in the circuit or the component.
      • If greater than 100 Ω replace the appropriate device.
    • If the test lamp illuminates 
  6. Vehicle OFF, remove the A4 Hybrid/EV Battery Pack cover. Refer to High Voltage Battery Cover Replacement (Top Cover) , High Voltage Battery Cover Replacement (Front Cover) , High Voltage Battery Cover Replacement (Left Side) and/or High Voltage Battery Cover Replacement (Right Side)
  7. Connect the EL-50211  low voltage jumper harness extension.
  8. Disconnect the X8 harness connector at the K16 Battery Energy Control Module.
  9. Verify that a test lamp does not illuminate between the ignition circuit terminal 9 and ground.
    • If the test lamp illuminates 

      Repair the short to voltage on the ignition circuit.

    • If the test lamp does not illuminate 
  10. Vehicle in Service Mode
  11. Verify a test lamp illuminates between the ignition circuit terminal 9 and ground.
    • If the test lamp does not illuminate. 
    1. Vehicle OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If the test lamp illuminates 
  12. Replace the K16 Battery Energy Control Module.
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