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 .
- Verify that none of the following conditions exist:
- The inlet and outlet air vents do not have any obstructions or blockages.
- The vent fan blades are not broken or damaged.
- The internal foam seals are not missing or damaged.
- If any conditions are found, remove, repair or replace as necessary.
- Ignition OFF, disconnect the X3 harness connector at the drive motor generator battery control module.
- Test for 1k Ω-209k Ω between the terminals listed below. The resistance of each temperature sensor should be within the specified range, and within 500 Ω of each other. Refer to Temperature Versus Resistance
.
- Sensor 1-5 V reference circuit terminal 1 and low reference circuit terminal 2
- Sensor 2-5 V Reference circuit terminal 3 and low reference circuit terminal 4
- Sensor 3-5 V Reference circuit terminal 5 and low reference circuit terminal 6
- Sensor 4-5 V Reference circuit terminal 7 and low reference circuit terminal 8
- If not within the specified range, replace the drive motor battery sensor module wiring harness.
- If all circuits test normal, replace the drive motor generator battery control module.
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.
NOTE:
The following test must be performed when the battery pack has equalized at room temperature. An increase or decrease in temperature will cause resistance to change and may result in invalid test results.