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.

Vehicle OFF, disable the high voltage at the T18 Battery Charger. Refer to High Voltage Disabling . Disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
Test for infinite resistance between the control pilot signal circuit terminal 2 of the X98 Hybrid/EV Battery Charger Receptacle and the terminals listed below:

Fig 1: Hybrid/EV Battery Charger Receptacle And Terminals
Courtesy of GENERAL MOTORS COMPANY

NOTE: The following tests are performed at the X98 Hybrid/EV Battery Charger Receptacle and not at the harness connector to the X98 Hybrid/EV Battery Charger Receptacle.
- Terminal 4
- Terminal 1
- Terminal 5
- Terminal 3
- If less than infinite resistance
1. Disconnect the harness connector from the X98 Hybrid/EV Battery Charger Receptacle.
2. Test for infinite resistance between the harness connector control pilot signal circuit terminal 2 and the terminals listed below:
  NOTE: This test is performed on the vehicle side of the harness connector.
- Terminal 4
- Terminal 1
- Terminal 5
- Terminal 3
  - If less than infinite resistance, repair the short between the circuits.
  - If infinite resistance, replace the X98 Hybrid/EV Battery Charger Receptacle.
- If infinite resistance
Replace the K114B Hybrid/EV Powertrain Control Module 2.