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Home >> Chevrolet >> 2016 >> Malibu Premier >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - DTC B1000 To DTC U1500 >> Diagnostic Information and Procedures >> DTC P16B7: Electric A/C Compressor Control Module Wake-Up Circuit Performance >> Circuit/System Testing
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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.

NOTE:

Use the schematics and connector end views to identify the device's accessory wakeup serial data 2 circuit terminals.

  1. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect the X1 harness connector at the G1 A/C Compressor. It may take up to 2 min for all vehicle systems to power down.
  2. Ignition ON/Vehicle In Service Mode.
  3. Verify that a test lamp illuminates between the accessory wakeup serial data 2 circuit terminal 2 X1 and ground.
    • If the test lamp does not illuminate 
    1. Disable the high voltage system. Refer to High Voltage Disabling .
    2. Reconnect the 12 V battery.
    3. Ignition/Vehicle OFF and all vehicle systems OFF, remove the test lamp, disconnect the X3 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    4. Test for linfinite resistance between the G1 A/C Compressor wake up circuit terminal 2 X1 and the K114B Hybrid/EV Powertrain Control Module 2 wake up circuit terminal 8 X3.
      • If less than infinite resistance, repair the short to ground in the accessory wakeup serial data 2 circuit.
      • If infinite resistance
    5. Test for less than 2 Ω between the G1 A/C Compressor wakeup circuit terminal 2 X1 and the K114B Hybrid/EV Powertrain Control Module 2 wake up circuit terminal 8 X3.
      • If 2 Ω or greater, repair the open/high resistance in the accessory wakeup serial data 2 circuit.
      • If less than 2 Ω
    6. Ignition ON/Vehicle In Service Mode.
    7. Verify that a test lamp illuminates between the K114B Hybrid/EV Powertrain Control Module 2 accessory wakeup serial data circuit terminal 9 X3 and ground.
      • If the test lamp does not illuminate, test the accessory wakeup serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
      • If the test lamp illuminates
    8. Replace the K114B Hybrid/EV Powertrain Control Module 2.
    • If the test lamp illuminates 
  4. Test or replace the G1 A/C Compressor.
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