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.

Clear the DTC, connect the vehicle to a known good DC fast charge station.
Allow the vehicle to charge for at least 20 minutes.
Verify DTC P325F is set.
- If DTC P325F is not set
  Advise the customer to report a problem with the DC fast charge station.
- Go to next step: If DTC P325F is set
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. Disconnect the X2 harness connector at the K190 Power Line Communication Module.
Fig 1: Identifying X98 Hybrid/EV Battery Charger Receptacle 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.

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:
- Terminal 1
- Terminal 3
- Terminal 4
- Terminal 5
- DC+
- DC-
- If less than infinite resistance
1. Disconnect the X1 harness connector at 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:
- Terminal 4
- Terminal 1
- Terminal 5
- Terminal 3
- DC+
- DC-
  - If less than infinite resistance, repair the short between the circuits.
  - If infinite resistance, replace the X98 Hybrid/EV Battery Charger Receptacle.
- Go to next step: If infinite resistance
Fig 2: Identifying X98 Hybrid/EV Battery Charger Receptacle Terminals
Courtesy of GENERAL MOTORS COMPANY

Test for less than 2 Ω in the control pilot signal circuit end to end between the terminals listed below:
- K190 Power Line Communication Module terminal 8 X2 and X98 Hybrid/EV Battery Charger Receptacle 2
- K114B Hybrid/EV Powertrain Control Module 2 terminal 8 X2 and X98 Hybrid/EV Battery Charger Receptacle 2
- If 2 Ω or greater
1. Disconnect the X1 harness connector at the X98 Hybrid/EV Battery Charger Receptacle.
2. Test for less than 2 Ω in the control pilot signal circuit end to end.
  - If 2 Ω or greater, replace the X98 Hybrid/EV Battery Charger Receptacle.
  - If less than 2 Ω, repair the open/high resistance in the circuit.
  - Go to next step: If less than 2 Ω
Replace the K190 Power Line Communication Module.