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. Refer to High Voltage Disabling . Disconnect the high voltage harness connector at the E54 Hybrid/EV Battery Pack Coolant Heater.
- Test for 61 - 75 Ω between terminal A and terminal B at the E54 Hybrid/EV Battery Pack Coolant Heater.
- If not within the specified range
Replace the T24 Battery Charger and the E54 Hybrid/EV Battery Pack Coolant Heater.
- Go to next step: If within the specified range
- If not within the specified range
- With the EL-50772
set on the Isolation test setting, test for 26 - 550M Ω between the E54 Hybrid/EV Battery Pack Coolant Heater terminals listed below and the coolant heater assembly ground:
- Terminal A
- Terminal B
- If less than the specified value
Replace the E54 Hybrid/EV Battery Pack Coolant Heater.
- Go to next step: If within the specified value
- Replace the T24 Battery Charger.
NOTE:
The following continuity tests must be performed using an EL-50772 Insulation Multimeter. Select the Isolation test setting, then select the 500 V range.