Circuit/System Testing
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- 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.
- Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
- Test for infinite resistance between the terminals listed below and ground;
- Positive contactor terminal X2
- Positive contactor terminal X3
- Negative contactor terminal X2
- Negative contactor terminal X3
- If less than the specified value, replace the high voltage cable.
- Test for less than 1 Ω between the terminals listed below;
- B+ (300 V) and positive contactor terminal X2
- Ground (300 V) and negative contactor terminal X2
- Positive contactor terminal X3 and positive cable terminal X1
- Negative contactor terminal X3 and negative cable terminal X2
- If greater than the specified range, replace the high voltage cable.
- Connect the 12 V battery.
- Ignition ON, command the negative and positive contactors and the current limit relay ON and OFF with a scan tool. Listen for the contactors and relay to turn ON and OFF.
- If the negative contactor, positive contactor or the current limit relay does not turn ON and OFF, refer to High Voltage Contactor/Relay Malfunction .
- If all the circuit tests normal, replace the drive motor generator battery.
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:
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
Failure to follow the procedures may result in serious injury or death.