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 will perform the following tasks:

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 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 at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures exactly as written may result in serious injury or death.

Ignition OFF, disable the high voltage. Refer to High Voltage Disabling .
Disconnect the X4A connector at the T18 battery charger and at the X3 connector at the A28 Hybrid Battery Disconnect Assembly.
Test for greater than 100 Ω between the high voltage circuit terminals listed below and ground:
- High Voltage Output terminal A X4A
- High Voltage Output terminal B X4A
- If less than the specified range, test the high voltage circuit for a short to ground.
Test for less than 10 Ω between the high voltage circuit terminals listed below:
- Terminal A X4A, T18 Battery Charger and A X3, A28 Hybrid Battery Disconnect Assembly
- Terminal B X4A, T18 Battery Charger and B X3, A28 Hybrid Battery Disconnect Assembly
- If greater than the specified range, test the high voltage circuit for an open/high resistance.
If all circuits tests normal, refer to DTC P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0D0A, P0D11, P1EBC-P1EBF, P1EC0, or P1EC3-P1EC5 for hybrid battery contactor diagnostics.
If all circuits test normal, disable the high voltage. Refer to High Voltage Disabling . Replace the T18 battery charger.