Kia Niro: Hybrid Motor System / High voltage shut-off procedures

High voltage components include:

High Voltage Battery Pack Assembly, Power Relay Assembly (PRA), BMS ECU, Hybrid Power Control Unit (HPCU), Hybrid Drive Motor, HSG, Electric A/C Compressor, Low DC/DC Converter (LDC), Power Cable, Electric Compressor, etc.

Switch "OFF" the ignition and disconnect the negative (-) terminal of the auxiliary 12V battery.

Remove the safety plug cover (A) under the rear seat.

Unfasten the hook (A) in the direction of arrow.

Unfasten the lever (A) in the direction of arrow.

Remove the safety plug (A).

Wait at least 5 minutes or until the capacitor in the high voltage system is fully discharged.

Measure the voltage between the inverter terminals to check that the capacitor in the inverter is discharged completely.

(2)	Disconnect the inverter power cable (A). Disconnect the inverter power cable as shown below.

(3)

Measure the voltage between the inverter (+) terminal and the inverter (-) terminal. Less than 30V : High voltage circuit properly shut More than 30V : Fault on high voltage circuit If voltage over 30V is measured, reconfirm that the safety plug has been removed. If voltage over 30V is measured even though the safety plug has been removed, there can be serious problem with the high voltage circuit. In this case, check DTC and do not touch the high voltage system circuits.