LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - DTC B1000 To DTC U1818 >> Diagnostic Information and Procedures >> DTC P06E4: Control Module Wake-Up Circuit Performance (Hybrid/EV Powertrain Control Module 2) >> Circuit/System Testing >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing: Notes

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.

NOTE: Use the schematic to determine which devices are on the K114B Hybrid/EV Powertrain Control Module 2 terminal 69 X2 accessory wake up serial data 2 circuit. Use the connector end view to identify the B+, ignition and accessory wake up serial data 2 circuit terminals for each of those devices.
  1. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
  2. Vehicle in Service Mode.
  3. Verify that a test lamp illuminates between the accessory wake up serial data circuit terminal 67 X2 and ground.
    • If the test lamp does not illuminate 
    1. Vehicle OFF and all vehicle systems OFF, remove the test lamp, disconnect the X4 harness connector at the K9 Body Control Module.
    2. Test for greater than 100 Ω between the K114B Hybrid/EV Powertrain Control Module 2 wake up circuit terminal 67 X2 and ground.
      • If 100 Ω or less, repair the short to ground in the accessory wake up serial data circuit.
      • If greater than 100 Ω
    3. Test for less than 2 Ω between the K114B Hybrid/EV Powertrain Control Module 2 wake up circuit terminal 67 X2 and the K9 Body Control Module wake up circuit terminal 22 X4.
      • If 2 Ω or greater, repair the open/high resistance in the accessory wake up serial data circuit.
      • If less than 2 Ω
    4. Replace the K9 Body Control Module.
    • If the test lamp illuminates 
  4. Vehicle OFF, remove the test lamp, all access doors closed, all vehicle systems OFF and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 2 min for all vehicle systems to power down.
  5. Test for greater than 100 Ω, but less than infinite resistance, between the accessory wake up serial data 2 circuit terminal 69 X2 and ground.
    • If 100 Ω or less 

      Refer to Testing the Accessory Wake Up Serial Data 2 Circuits for a Short to Ground.

    • If infinite resistance 

      Test for an open/high resistance in the accessory wake up serial data 2 circuit.

    • If greater than 100 Ω and less than infinite resistance 
  6. Vehicle in Service Mode.
  7. Verify that a test lamp illuminates between each B+ circuit terminal and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Vehicle OFF, remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Vehicle OFF, remove the test lamp.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • If the test lamp illuminates 
  8. Vehicle in Service Mode.
  9. Verify that a test lamp illuminates between each ignition circuit terminal and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Vehicle OFF, remove the test lamp.
    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 less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Vehicle OFF, remove the test lamp.
    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, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • If the test lamp illuminates 
  10. Replace the K114B Hybrid/EV Powertrain Control Module 2.
scientia non olet · About LEMON Manuals