To check the operation of the HV present lamp, turn the battery disconnect switch to the OFF position and then back to the ON position.
When the disconnect switch is turned to the ON position, the HV present lamp will illuminate briefly and then turn OFF, which indicates:
The operation of the lamp battery circuit is correct.
The voltage level in the power train electrical system is at a safe level.
Under normal conditions, the HV present lamp will be illuminated when the engine is running, indicating that both the AC power bus and the DC accessory bus are energized.