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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Wiring Systems And Power Management - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P15B9 or P15BA >> Circuit/System Testing

Circuit/System Testing

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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. Ignition OFF/Vehicle OFF, disconnect the X1 harness connector at the G1 A/C Compressor.
  2. Verify that a test lamp does not illuminate between the ignition circuit terminal 3 and ground.
    • If the test lamp illuminates 

      Repair the short to voltage on the ignition circuit.

    • Go to next step: If the test lamp does not illuminate 
  3. Ignition ON/Vehicle in Service Mode
  4. Verify a test lamp illuminates between the ignition circuit terminal 3 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF/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 less than 2 Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the G1 A/C Compressor and all devices that share the same ignition circuit.
    2. Test for infinite resistance between the ignition circuit terminal 3 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance.
    3. Connect each of the devices one at a time and test for greater than 10 Ω between the ignition circuit terminal 3 and ground.
      • If 10 Ω or less, disconnect the appropriate device and retest to verify if the short is in the circuit or the component.
      • If greater than 10 Ω replace the appropriate device.
    • Go to next step: If the test lamp illuminates 
  5. Replace the G1 A/C Compressor.
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